A gas content detection device and method applied to three-dimensional monitoring in a confined space

Abstract

The application discloses a kind of gas content detection device and detection method applied to three-dimensional monitoring of confined space, and gas content detection device includes the gas detector that can be fixed or mobile distribution in confined space and the processor connected by data remote transmission;Gas detector is used to detect gas content and transmit the signal collected, and processor is used to receive the signal collected by gas detector and carry out data processing;Fixed distribution in confined space gas detector is one or multiple arranged in interval along height direction;Mobile distribution in confined space gas detector is the gas detector that can be controlled and moved in height direction.The application can realize three-dimensional monitoring of gas content in confined space, improve monitoring efficiency, range and sensitivity, and greatly improve safety factor.

Description

Technical Field

[0001] This invention relates to the field of environmental monitoring, specifically to a gas content detection device and method for three-dimensional monitoring in confined spaces. Background Technology

[0002] Confined spaces refer to enclosed or semi-enclosed facilities and places with restricted access, poor ventilation, and the potential presence of flammable, explosive, toxic, or hazardous substances or oxygen deficiency, posing a threat to the health and safety of personnel entering or exploring such spaces. Examples include reactors, towers, vessels, tanks, furnaces, boiler drums, as well as basements, cellars, pits (pools), sewers, or other enclosed or semi-enclosed places.

[0003] Currently, gas content detection in confined spaces typically involves personnel entering and using handheld instruments. However, in practical applications, this method poses a significant threat to personnel's health and safety, especially in spaces containing toxic or hazardous substances or lacking oxygen. This is particularly true when the concentration of harmful gases within a specific confined space is dynamically changing, increasing the risk of accidents. Furthermore, current handheld instruments only detect a single point within the space, making multi-point, three-dimensional monitoring difficult, especially for deeper structures such as tanks, chimneys, and reaction towers.

[0004] However, in actual use, the following defects exist:

[0005] (1) Currently, the gas monitoring probes and the main body of the monitoring device are all packaged together. As the sensitivity and lifespan of the probes decrease with the frequency of use and the environment, some monitoring devices with reduced sensitivity, lower accuracy, or probe damage are directly discarded during use. Most of the discarded gas monitoring devices are due to sensor failure in the probe, while other modules are still working properly, which undoubtedly increases the cost of product use. In addition, some gas monitoring devices can monitor different gases by connecting different probes to their monitoring modules. However, because the gas monitoring probes and the main body of the monitoring device are integrated into one unit, the device can only be used to monitor the same gas, reducing its versatility.

[0006] (2) Currently, the housing of gas detectors generally consists of a housing and an end cap. The end cap is fastened to the housing, and a ring-shaped sealing ring is placed between the end cap and the housing. The two sides of the sealing ring are respectively attached to the housing and the end cap. For example, Chinese utility model patent, patent number CN201820412629.0, discloses a gas detection module for flue gas analysis equipment, including a housing. The bottom of the housing is open, and a PCB board is covered on the bottom of the housing by a threaded connection. A sealing ring is also installed at the contact point between the bottom of the housing and the PCB board. A gas detection sensor is connected to the PCB board. The gas detection sensor is located in the space formed by the housing and the PCB board. An air inlet and an air outlet are respectively provided on the corresponding sides above the side wall of the housing. Traditional sealing rings only rely on two sealing end faces to produce a sealing effect. Not only is the sealing effect poor, but the position of the sealing ring is also difficult to fix during assembly. In addition, since the working area of ​​the gas detector is humid and most monitoring areas are accompanied by corrosive gases, the poor sealing effect of the gas detector housing directly leads to the corrosion and damage of the internal electronic components of the gas detector.

[0007] (3) There are many types of common gas monitoring instruments, such as gas monitoring based on the principle of infrared absorption, gas monitoring based on the principle of grating chromatography, etc. Taking the patent application document with application number "CN201810737837.2" and application name "combustible gas detection circuit, monitoring system and its working method" as an example, it relates to a combustible gas detection circuit, monitoring system and its working method. The combustible gas detection circuit is suitable for using a Wheatstone bridge structure. The Wheatstone bridge structure includes: a comparison resistor H1 and a detection resistor H2, which are respectively used as bridge arms; wherein the comparison resistor H1 is suitable for sealing in pure air; the detection resistor H2 is suitable for contacting combustible gas; and a combustible gas detection module is provided in the Wheatstone bridge structure, and the combustible gas detection module is suitable for judging the signal change between the comparison resistor H1 and the detection resistor H2 after contacting combustible gas. A combustible gas detection module is integrated into the Wheatstone bridge structure. This module is used to determine whether a combustible gas leak has occurred by comparing the signal changes between the comparison resistor H1 and the detection resistor H2 after contact with the combustible gas. However, further research revealed several shortcomings in the existing gas monitoring equipment: for example, it can only perform qualitative detection of the gas, not quantitative detection; it suffers from insufficient detection sensitivity, poor gas selectivity, and susceptibility to environmental humidity, ultimately leading to unstable gas detection results and hindering the improvement of gas sensor monitoring efficiency.

[0008] (4) There are many types of common gas monitoring instruments, such as gas monitoring based on the principle of infrared absorption, gas monitoring based on the principle of grating chromatography, etc. Further research revealed that, regardless of the structure of the gas monitoring equipment, after acquiring the gas monitoring data, technicians need to transmit the gas data remotely in order to realize the analysis, diagnosis and reprocessing of the gas data. As described in patent document CN201721107736.4, entitled "A Gas Data Acquisition and Monitoring Gateway for Hospitals," this gas data acquisition and monitoring gateway for hospitals includes a box-type housing and a circuit board located inside the housing. The circuit board houses a gateway circuit, including a main control chip, three opto-isolated RS485 interfaces, one SPI interface, one network interface, a power supply circuit, an IP DIP switch circuit, an information storage device, and a power amplifier circuit. The main control chip is model S3F8S7B. All three RS485 interfaces are bidirectionally connected to the main control chip. RS485-1 and RS485-3 interfaces are used for signal acquisition, while the RS485-2 interface connects to an ESP826614 WIFI module for signal output. The SPI interface is bidirectionally connected to the main control chip for serial signal acquisition. This invention can collect data on various gases in a hospital, promptly detect abnormal gas conditions in different departments, and implement corresponding control measures. The inventors discovered that existing gas data transmission circuits, including the aforementioned patent documents, still have the following defects: the gas data is easily interfered with during the transmission process, resulting in serious noise pollution; and when using RS485 or RS232 communication lines, the direct communication link may leak information, which is not conducive to the confidentiality of gas data. Summary of the Invention

[0009] The purpose of this invention is to address the shortcomings of existing technologies by providing a gas content detection device and method for three-dimensional monitoring of confined spaces. This device enables three-dimensional monitoring of gas content within confined spaces and improves the safety factor.

[0010] This invention also enables flexible and quick replacement of the probe body by using a detachable and separate structure for the probe body and the monitor body. It also utilizes an annular conductive rail and a spring probe to achieve a contact-type electrical connection. Furthermore, by using a first side wing on one side of the sealing ring to seal with the outer circumference of the housing, a second side wing to seal with the packing groove, and a third side wing to seal with the packing gap, multiple sealing surfaces are formed between the housing and the end cap, thereby greatly improving the sealing effect.

[0011] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0012] A gas content detection device for three-dimensional monitoring in confined spaces includes a gas detector that can be fixed or moved within the confined space and a processor connected via remote data transmission; the gas detector is used to detect gas content and transmit the collected signals, and the processor is used to receive the signals collected by the gas detector and perform data processing.

[0013] The gas detectors fixedly distributed within the confined space can be one or multiple detectors spaced apart along the height direction;

[0014] The gas detectors that are moved and distributed within the confined space are gas detectors that can be moved in a controlled manner in the height direction;

[0015] The gas detector includes a probe body and a monitor body. The monitor body includes a gas detector housing with multiple sealing surfaces and a gas detection module and a gas data remote transmission module installed therein. The monitor body and the probe body are detachably connected.

[0016] Furthermore, the gas detector housing with multiple sealing surfaces includes a housing, an end cap, and a sealing ring; the housing has an opening on one side, and a packing groove is provided on the end face of the opening; the end cap is detachably connected to the opening of the housing, and a positioning flange for inserting into the opening of the housing is provided on one side of the end cap, with a packing gap between the outer peripheral surface of the positioning flange and the inner peripheral surface of the opening of the housing; the sealing ring is placed between the housing and the end cap, and the width of the sealing ring is adapted to the end face of the opening of the housing; the outer edge of the sealing ring has a first side wing, which is tightly fitted to the outer peripheral surface of the housing; the middle of the sealing ring has a second side wing, which is tightly pressed into the packing groove; the inner edge of the sealing ring has a third side wing, which is tightly pressed into the packing gap.

[0017] Furthermore, the detachable connection between the monitor body and the probe body is as follows: the probe body has a cylindrical structure, and a conductive rail circuit board is provided on the top of the probe body, with the conductive rail circuit board and the probe body located on the same axis. Multiple concentrically arranged annular conductive rails are laid on the upper surface of the conductive rail circuit board. The bottom of the monitor body has an annularly protruding probe interface, and a probe circuit board is provided inside the probe interface. The probe circuit board has the same number of spring probes as the annular conductive rails. The top of the probe body is detachably connected to the probe interface of the monitor body, and each spring probe corresponds to a separate annular conductive rail. The spring probe is electrically connected when it contacts the annular conductive rail.

[0018] Furthermore, the housing, end cap, and sealing ring are provided with a set of bolt holes and are detachably connected by bolts; the outer edges of the first side wing, the second side wing, and the third side wing on the sealing ring are all arc surfaces; the lengths of the first side wing and the third side wing are greater than that of the second side wing.

[0019] Furthermore, the housing and end cap are made of resin material; the longitudinal section of the housing and end cap is teardrop-shaped.

[0020] Furthermore, the spring probe includes a conductive cap, a spring, and a cylinder;

[0021] The top of the cylinder is tapered, and the bottom of the cylinder is vertically welded to the probe circuit board. The bottom of the conductive cap extends into the cylinder from the top of the cylinder, and the bottom of the conductive cap is provided with a limiting rolled edge that matches the tapered top of the cylinder. The spring is located inside the cylinder, and the upper and lower ends of the spring support the conductive cap and the probe circuit board, respectively.

[0022] Furthermore, the conductive rail circuit board has a circular contact arranged coaxially in the middle of the annular conductive rail, and the probe circuit board also has a spring probe corresponding to the position of the circular contact.

[0023] Furthermore, the top of the probe body is threaded into the probe interface of the monitor body, or the top of the probe body is inserted into the probe interface of the monitor body.

[0024] Furthermore, the gas content detection device and detection method for three-dimensional monitoring of confined spaces also include a point controller for the gas detector, which includes a motor, housing, roller, main shaft and limit switch;

[0025] The housing has an opening on one side. The motor is vertically mounted on the housing. The motor shaft extends into the housing and is connected to a worm gear. The roller is fixed on the main shaft and is rotatably connected to the inside of the housing through the main shaft. A turbine that cooperates with the worm gear is installed on one side of the roller. A steel wire rope is wound around the outer circumference of the roller, and the free end of the steel wire rope extends out from the opening of the housing.

[0026] One end of the main shaft extends out of the housing and is connected to a drive gear. A driven gear and a limiting gear are rotatably connected to the housing on one side of the drive gear. The driven gear has a full tooth section and a half tooth section arranged coaxially. The full tooth section meshes with the drive gear, and the half tooth section meshes with the limiting gear. A paddle is fixedly connected to one side of the limiting gear.

[0027] The limit switch is fixedly connected to the housing below the limit gear, and the limit switch is switched by the rotation angle of the lever. The limit switch is connected in series in the power supply circuit of the motor.

[0028] Furthermore, the limit switch includes an insulator, on which two inclined metal springs are fixedly connected, and the tops of the two metal springs are electrically connected in contact.

[0029] When the paddle rotates and touches one of the metal springs, the steel wire rope is completely retracted onto the drum; when the paddle rotates and touches the other metal spring, the steel wire rope is completely released.

[0030] Furthermore, the housing is also equipped with a gas detection module and a gas data remote transmission module;

[0031] The gas detection module includes: a CO gas sensor, an O2 gas sensor, an H2S gas sensor, a CH4 gas sensor, as well as a gas detection circuit and an MCU main control circuit.

[0032] The gas detection circuit includes a CO gas detection circuit, an O2 gas detection circuit, an H2S gas detection circuit, and a CH4 gas detection circuit;

[0033] The CO gas detection circuit includes an operational amplifier U5B and a quad operational amplifier U6A, wherein the quad operational amplifier U6A is an LM324 chip. The positive input terminal of operational amplifier U5B is connected to the reference voltage value of the CO gas sensor, and the negative input terminal of operational amplifier U5B is connected to the output terminal of the CO gas sensor through a current-limiting resistor R11. The output terminal of operational amplifier U5B is connected to the 1IN+ pin of the quad operational amplifier U6A through a current-limiting resistor R12, and the 1IN- pin of the quad operational amplifier U6A is connected to the 1OUT pin of the quad operational amplifier U6A. The VCC pin of the quad operational amplifier U6A is connected to a 3V DC power supply, and the GND pin of the quad operational amplifier U6A is connected to the AC neutral line.

[0034] The O2 gas detection circuit includes a quad operational amplifier U4A, which is an LM324 quad operational amplifier chip. The 1IN+ pin of the quad operational amplifier U4A is connected to the output of the O2 gas sensor via a current-limiting resistor R6, and the 1IN- pin of the quad operational amplifier U4A is grounded via a current-limiting resistor R8. The VCC pin of the quad operational amplifier U4A is connected to a 3V DC power supply, and the GND pin of the quad operational amplifier U4A is connected to the AC neutral line.

[0035] The H2S gas detection circuit includes an operational amplifier U4B and a quad operational amplifier U6B. The quad operational amplifier U6B is an LM324 quad operational amplifier. The positive input terminal of the operational amplifier U4B is connected to the reference voltage value of the H2S gas sensor, and the negative input terminal of the operational amplifier U4B is connected to the output terminal of the H2S gas sensor through a current-limiting resistor R16. The output terminal of the operational amplifier U4B is connected to the 1IN+ pin of the quad operational amplifier U6B through a current-limiting resistor R18, and the 1IN- pin of the quad operational amplifier U6B is connected to the 1OUT pin of the quad operational amplifier U6B.

[0036] The CH4 gas detection circuit includes a bias current amplifier U5A, which is an ADA4505 bias current amplifier chip. The +IN A pin of the bias current amplifier U5A is connected to the positive output terminal of the CH4 gas sensor via a current-limiting resistor R15, and the -IN A pin of the bias current amplifier U5A is connected to the negative output terminal of the CH4 gas sensor via a current-limiting resistor R19. The VCC pin of the bias current amplifier U5A is connected to a 3V DC power supply, and the GND pin of the bias current amplifier U5A is connected to the AC neutral line.

[0037] The MCU main control circuit uses an STM32F036 chip. The A0.0+ pin of the STM32F036 is connected to the output of the quad operational amplifier U6B in the H2S gas detection circuit, and the A0.0- pin is connected to a 1.2V DC power supply. The A1.0+ pin of the STM32F036 is connected to the output of the quad operational amplifier U6A in the CO gas detection circuit, and the A1.0- pin is also connected to a 1.2V DC power supply. The A2.0+ pin of the STM32F036 is connected to the output of the quad operational amplifier U4A in the O2 gas detection circuit. The STM32F036's A2.0- pin is connected to the AC neutral line; the STM32F036's A3.0+ pin is connected to the output of the bias current amplifier U5A in the CH4 gas detection circuit; the STM32F036's A3.0- pin is connected to the AC neutral line; the STM32F036's VREF pin is connected to a 1.2V DC power supply; the STM32F036's AVSS- pin is connected to the AC neutral line; the STM32F036's DVSS- pin is grounded; the STM32F036's P2.5 pin is connected to the positive terminal of the first LED through a current-limiting resistor R4, and the negative terminal of the first LED is grounded.

[0038] The gas data remote transmission module includes:

[0039] Control circuit, and wireless communication circuit, clock circuit, and remote control circuit respectively connected to the control circuit;

[0040] The control circuit uses an MSP430F247 chip. Oscillator Y1 is located between the XIN and XOUT pins of the MSP430F247; oscillator Y2 is located between the XT2IN and XT2OUT pins of the MSP430F247; the DVCC and AVCC pins of the MSP430F247 are connected to a 3.3V DC power supply; the DVSS and AVSS pins of the MSP430F247 are grounded.

[0041] The wireless communication circuit uses a LoRa SX1278 chip. Specifically, the VDD pin of the LoRa SX1278 is connected to a 3.3V DC power supply; the RESET pin of the LoRa SX1278 is connected to the ACLK pin of the MSP430F247; the DIO0 pin of the LoRa SX1278 is connected to the SVSOUT pin of the MSP430F247; the SCK pin of the LoRa SX1278 is connected to the UCB1 CLK pin of the MSP430F247; the MISO pin of the LoRa SX1278 is connected to the UCB1 SOMI pin of the MSP430F247; the MOSI pin of the LoRa SX1278 is connected to the UCB1 SIMO pin of the MSP430F247; and the NSS pin of the LoRa SX1278 is connected to the SMCLK pin of the MSP430F247.

[0042] The clock circuit uses a pcf8563t chip. An oscillator Y3 is located between the OSCI and OSCO pins of the pcf8563t. The INT pin of the pcf8563t is connected to the P1.3 / TA2 pin of the MSP430F247. The VDD pin of the pcf8563t is connected to a 3.3V DC power supply. The SCL pin of the pcf8563t is connected to the UCB0 SOMI pin of the MSP430F247. The SDA pin of the pcf8563t is connected to the UCB0 SIMO pin of the MSP430F247.

[0043] The remote control circuit uses a PT26-21B / TR8 chip. Specifically, the CEV pin of the PT26-21B / TR8 is connected to the P1.1 / TA0 pin of the MSP430F247; the ECV pin of the PT26-21B / TR8 is grounded; the OUT pin of the PT26-21B / TR8 is connected to the CAOUT pin of the MSP430F247; the GND pin of the PT26-21B / TR8 is grounded; and the VCC pin of the PT26-21B / TR8 is connected to a 3.3V DC power supply.

[0044] Furthermore, in the gas detection circuit:

[0045] It also includes a temperature and humidity sensor; the chip signal of the temperature and humidity sensor is SHT30; wherein, the SDA pin of SHT30 is connected to the P1.7 pin of STM32F036, and the CLK pin of SHT30 is connected to the P1.6 pin of STM32F036.

[0046] It also includes: a sensor interface circuit; the sensor interface circuit uses a double-row 12-position socket, which is used to introduce the output terminals of the CO gas sensor, the O2 gas sensor, the H2S gas sensor, the positive output terminal of the CH4 gas sensor, and the negative output terminal of the CH4 gas sensor into the gas detection circuit;

[0047] A feedback capacitor C14 and a feedback resistor R13 are connected in parallel between the negative input terminal and the output terminal of the operational amplifier U5B; wherein, the capacitance value of the feedback capacitor C14 is 0.02uF and the resistance value of the feedback resistor R13 is 30K.

[0048] A feedback resistor R9 is also provided between the 1IN- pin of the quad operational amplifier U4A and the output terminal of the quad operational amplifier U4A; the resistance value of the feedback resistor R9 is 68K.

[0049] A feedback capacitor C19 and a feedback resistor R17 are connected in parallel between the negative input terminal and the output terminal of the operational amplifier U4B; the capacitance of the feedback capacitor C19 is 0.02uF, and the specification of the feedback resistor R17 is 15KΩ-0.1%-25ppm.

[0050] A feedback resistor R20 with a resistance value of 10K is also provided between the -IN A pin and the OUT A pin of the bias current amplifier U5A.

[0051] The current-limiting resistor R11 has a resistance of 120Ω; the current-limiting resistor R12 has a resistance of 100KΩ; the current-limiting resistor R6 has a resistance of 1KΩ; the current-limiting resistor R8 has a resistance of 1KΩ; the current-limiting resistor R16 has a specification of 33Ω-0.1%-25ppm; the current-limiting resistor R18 has a resistance of 100KΩ; the current-limiting resistor R15 has a resistance of 2KΩ; the current-limiting resistor R19 has a resistance of 100KΩ; the current-limiting resistor R4 has a resistance of 3KΩ.

[0052] It also includes: display circuitry;

[0053] The display circuit uses an OLED12864 chip. The VDD pin of the OLED12864 is connected to a 13.5V DC power supply. Pins D0 to D6 of the OLED12864 are connected to pins TB0 to TB6 of the MSP430F247, respectively. Pin D7 of the OLED12864 is connected to the TBCLK pin of the MSP430F247. Pin ERD of the OLED12864 is connected to the UCB0 CLK pin of the MSP430F247. Pin R / W of the OLED12864 is connected to the UCB0 pin of the MSP430F247. The SET pin is connected; the D / C pin of the OLED12864 is connected to the P2.7 / TA0 pin of the MSP430F247; the RESET pin of the OLED12864 is connected to the ADC12CLK pin of the MSP430F247; the CS pin of the OLED12864 is connected to the Rosc pin of the MSP430F247; the VSS pin of the OLED12864 is grounded.

[0054] In the gas data remote transmission module;

[0055] It also includes: storage circuitry;

[0056] The memory circuit uses an 85RC128 chip. The VDD pin of the 85RC128 is connected to a 3.3V DC power supply; the VSS pin is grounded; the WP pin of the 85RC128 is connected to the SMCLK pin of the MSP430F247; the SCL pin of the 85RC128 is connected to the UCB0SIMO pin of the MSP430F247; and the SDA pin of the 85RC128 is connected to the UCB0SIMO pin of the MSP430F247.

[0057] It also includes: a power supply unit;

[0058] The first terminal of the power supply unit is connected to a 9V DC power supply, and the third terminal of the power supply unit is grounded.

[0059] A transient suppression diode D1, a Schottky diode D2, a capacitor C4, and a capacitor C5 are also connected in parallel between the first terminal and the third terminal of the power supply unit.

[0060] A current-limiting resistor R6 is also provided between the first terminal of the power supply unit and the 9V DC power supply; the resistance value of the current-limiting resistor R6 is 2R.

[0061] A fuse F1 is also provided between the third terminal of the power supply unit and ground; the maximum rated current of the fuse F1 is 100mA, and the maximum rated power supply of the fuse F1 is 24V.

[0062] The transient voltage suppressor diode is model SMBJ15CA, and the Schottky diode is model SS14; the capacitance of capacitor C4 is 0.1uF, and the capacitance of capacitor C5 is 47uF.

[0063] The P1.6 / TA1 pin of the MSP430F247 is also connected to the first LED1, and the P1.5 / TA0 pin of the MSP430F247 is also connected to the second LED2.

[0064] The specific steps for a gas content detection device applied to three-dimensional monitoring in confined spaces are as follows:

[0065] (1) Arrange multiple gas detectors at intervals along the height direction in a confined space, or install a gas detector movably in a confined space and make it movable in the height direction; achieve gas content detection at different height positions through the above two installation methods;

[0066] (2) The gas detector transmits the collected signals to the processor for processing via data transmission to monitor the gas content in the confined space.

[0067] Compared with existing technologies, this invention enables three-dimensional monitoring of gas content within a confined space, improving monitoring efficiency, range, and sensitivity, and significantly enhancing the safety factor; it also has the following advantages:

[0068] (1) By designing the probe body and the monitor body as detachable separate structures, and using the annular conductive rail on the probe body to achieve contact electrical connection with the spring probe on the monitor body, the signals and power supply of the probe body and the monitor body can be connected. Compared with the currently used integrated gas monitoring device, the probe can be replaced flexibly and quickly, avoiding the abandonment of the entire integrated gas monitoring device after the failure of some probes with short lifespan. In addition, the monitor body can also be connected to different probe bodies to collect and monitor different gases, further improving the flexibility of the present invention.

[0069] (2) By setting the first, second, and third side wings on one side of the sealing ring, the sealing ring as a whole forms an E-shaped longitudinal section. The first side wing seals with the outer circumference of the shell, the second side wing seals with the packing groove, and the third side wing seals with the packing gap. This creates multiple sealing surfaces between the shell and the end cap, thus greatly improving the sealing effect. By designing the sealing ring as an E-shaped longitudinal section, the sealing ring can be directly fastened to the end face of the shell opening during assembly, and then the end cap can be installed. This avoids the problem of poor sealing effect caused by displacement during assembly of traditional sealing rings. By designing the longitudinal sections of the shell and the end cap as teardrop-shaped, small droplets condensed on the shell can quickly drip down along the teardrop-shaped arc surface in some high-humidity working environments, thereby reducing the impact of high-humidity working environments on the shell.

[0070] (3) The steel wire rope of the suspended gas detector is mechanically wound and unwound by rotating the drum driven by the motor, thereby increasing the efficiency of the work. In the process of winding and unwinding, the drive gear, driven gear and limit gear work together to drive the paddle to rotate, and then the paddle touches the limit switch to stop the motor in an emergency, thereby avoiding excessive unwinding and winding during the work, thus protecting the present invention and the gas detector.

[0071] (4) A novel gas detection module is provided, comprising a CO gas sensor, an O2 gas sensor, an H2S gas sensor, a CH4 gas sensor, and structural units such as a gas detection circuit and an MCU main control circuit. This novel gas detection module with the above structural features can realize real-time monitoring of multiple components such as CO, O2, H2S, and CH4, and has good anti-interference capabilities, high monitoring sensitivity, and reliable and stable detection results. A gas data remote transmission module is also provided, comprising structural units such as a control circuit, a wireless communication circuit, a clock circuit, a remote control circuit, a display circuit, a storage circuit, and a power supply unit. This gas data remote transmission module with the above structural features can realize remote communication transmission of gas data and ensure the reliability and confidentiality of the data during remote transmission, showing good application prospects. Attached Figure Description

[0072] Figure 1 This is a schematic diagram of the structure of the present invention;

[0073] Figure 2 This is a schematic diagram of the probe body.

[0074] Figure 3 Schematic diagram of the monitor body;

[0075] Figure 4This is a schematic diagram of the spring probe structure;

[0076] In the diagram: A1, probe body; A2, monitor body; A101, conductive rail circuit board; A102, circular contact; A103, annular conductive rail; A201, probe interface; A202, probe circuit board; A203, spring probe; A401, conductive cap; A402, limiting rolled edge; A403, spring; A404, cylinder; A405, top of cylinder.

[0077] Figure 5 A schematic diagram of the semi-sectional structure of a gas detector housing with multiple sealing surfaces;

[0078] Figure 6 This is a schematic diagram of the shell structure;

[0079] Figure 7 This is a schematic diagram of the end cap structure;

[0080] Figure 8 This is a schematic diagram of the sealing ring structure;

[0081] In the diagram: B1, housing; B2, end cap; B3, sealing ring; B4, packing groove; B5, positioning flange; B6, packing gap; B7, first side wing; B8, second side wing; B9, third side wing; B10, bolt hole.

[0082] Figure 9 A schematic diagram of the point controller for a gas detector;

[0083] Figure 10 This is a structural diagram of the front side of the housing of a gas detector point controller when it is cut open.

[0084] In the diagram: C1, motor; C2, housing; C3, roller; C4, guide wheel; C5, main shaft; C6, drive gear; C7, half-tooth section; C8, full-tooth section; C9, driven gear; C10, limit gear; C11, lever; C12, metal spring; C13, insulator; C14, limit switch; C15, worm gear; C16, turbine; C17, bearing.

[0085] Figure 11 This is an electrical schematic diagram of the CO gas detection circuit in the gas detection circuit provided by the present invention;

[0086] Figure 12 This is an electrical schematic diagram of the O2 gas detection circuit in the gas detection circuit provided by the present invention;

[0087] Figure 13 This is an electrical schematic diagram of the H2S gas detection circuit in the gas detection circuit provided by the present invention;

[0088] Figure 14 This is an electrical schematic diagram of the CH4 gas detection circuit in the gas detection circuit provided by the present invention;

[0089] Figure 15 This is an electrical schematic diagram of the MCU main control circuit in the gas detection circuit provided by the present invention;

[0090] Figure 16 An electrical schematic diagram of the temperature and humidity sensor in the gas detection circuit provided by the present invention;

[0091] Figure 17 An electrical schematic diagram of the sensor interface circuit in the gas detection circuit provided by the present invention;

[0092] Figure 18 An electrical schematic diagram of the control circuit for the gas data remote transmission module provided by the present invention;

[0093] Figure 19 An electrical schematic diagram of the wireless communication circuit for the gas data remote transmission module provided by the present invention;

[0094] Figure 20 An electrical schematic diagram of the clock circuit for the gas data remote transmission module provided by the present invention;

[0095] Figure 21 An electrical schematic diagram of the remote control circuit for the gas data transmission module provided by the present invention;

[0096] Figure 22 An electrical schematic diagram of the display circuit for the gas data remote transmission module provided by the present invention;

[0097] Figure 23 An electrical schematic diagram of the gas data remote transmission module storage circuit provided by the present invention;

[0098] Figure 24 An electrical schematic diagram of the power supply unit for the gas data remote transmission module provided by the present invention. Detailed Implementation

[0099] The invention will be described in detail below with reference to specific implementation examples. The description in this section is only exemplary and explanatory, and does not limit the scope of protection of the invention.

[0100] Example 1

[0101] A gas content detection device for three-dimensional monitoring in confined spaces includes a gas detector that can be fixed or moved within the confined space and a processor connected via data transmission. The gas detector is used to detect the gas content and transmit the collected signals, while the processor is used to receive and process the signals collected by the gas detector.

[0102] The gas detectors fixedly distributed within the confined space can be one or multiple detectors spaced apart along the height direction;

[0103] The gas detectors that are mobile and distributed in a confined space are gas detectors that can be moved in a controlled manner in the height direction;

[0104] The gas detector includes a probe body and a monitor body. The monitor body includes a gas detector housing with multiple sealing surfaces and a gas detection module and a gas data remote transmission module installed therein. The monitor body and the probe body are detachably connected.

[0105] Example 2

[0106] Based on the structure of Example 1, the gas detector includes a probe body A1 and a monitor body A2.

[0107] Reference Figure 2 The probe body A1 has a cylindrical structure. The top of the probe body A1 is provided with a conductive rail circuit board A101, and the conductive rail circuit board A101 and the probe body A1 are located on the same axis. Multiple concentrically arranged annular conductive rails A103 are laid on the upper surface of the conductive rail circuit board A101.

[0108] Reference Figure 3 The bottom of the monitor body A2 is provided with a ring-shaped protruding probe interface A201. The probe interface A201 contains a probe circuit board A202. The probe circuit board A202 is provided with the same number of spring probes A203 as the ring-shaped conductive rail A103.

[0109] The top of the probe body A1 is detachably connected to the probe interface A201 of the monitor body A2, and each spring probe A203 corresponds to a separate annular conductive rail A103. When the spring probe A203 contacts the annular conductive rail A103, they are electrically connected.

[0110] Additionally, a circular contact A102 can be coaxially arranged in the middle of the annular conductive rail A103 on the conductive rail circuit board A101, and a spring probe A203 corresponding to the position of the circular contact A102 is also provided on the probe circuit board A202.

[0111] By designing the probe body A1 and the monitor body A2 as detachable separate structures, and utilizing the annular conductive rail A103 on the probe body A1 and the spring probe A203 on the monitor body A2 to achieve a contact-type electrical connection, the signals and power supply of the probe body A1 and the monitor body A2 can be connected. Compared with the currently used integrated gas monitoring device, the probe body A1 can be flexibly and quickly replaced, avoiding the need for the entire integrated gas monitoring device to be discarded due to the failure of some probes with short lifespans. In addition, the monitor body A2 can also be connected to different probe bodies A1 to collect and monitor different gases, further improving the flexibility of the invention.

[0112] The monitor body A2 includes a gas detector housing with multiple sealing surfaces, including a housing B1, an end cap B2, and a sealing ring 3.

[0113] Reference Figure 6 As shown, an opening is provided on one side of the housing B1, and a packing groove B4 is provided on the end face of the opening of the housing B1.

[0114] Reference Figure 5 and Figure 7 As shown, end cap B2 is detachably connected to the opening of housing B1. One side of end cap B2 is provided with a positioning flange B5 that is inserted into the opening of housing B1, and a filler gap B6 is left between the outer peripheral surface of positioning flange B5 and the inner peripheral surface of the opening of housing B1.

[0115] Reference Figure 8 As shown, the sealing ring B3 is placed between the housing B1 and the end cap B2, and the width of the sealing ring B3 is adapted to the open end face of the housing B1.

[0116] The outer edge of the sealing ring B3 is provided with a first side wing B7, which is tightly fitted to the outer peripheral surface of the housing B1.

[0117] The sealing ring B3 has a second side wing B8 in the middle, and the second side wing B8 is tightly pressed into the packing groove B4.

[0118] The inner edge of the sealing ring 3 is provided with a third side wing B9, which is tightly pressed into the packing gap B6.

[0119] By setting the first side wing B7, the second side wing B8, and the third side wing B9 on one side of the sealing ring B3, the sealing ring B3 is formed into an E-shaped longitudinal section. The first side wing B7 is sealed with the outer peripheral surface of the housing B1, the second side wing B8 is sealed with the packing groove B4, and the third side wing B9 is sealed with the packing gap B6. This creates multiple sealing surfaces between the housing B1 and the end cap B2, thereby greatly improving the sealing effect.

[0120] In addition, by designing the sealing ring B3 as an E-shaped longitudinal section structure, the sealing ring B3 can be directly snapped onto the end face of the opening of the housing B1 during assembly, and then the end cover B2 can be installed. This avoids the problem that the traditional sealing ring B3 is prone to displacement during assembly, resulting in poor sealing performance.

[0121] Example 3

[0122] Based on the structure of Example 2, the structure of the spring probe A203 is further optimized.

[0123] Reference Figure 4 The spring probe A203 includes a conductive cap A401, a spring A403, and a cylindrical body A404. The top A405 of the cylindrical body is tapered, and the bottom of the cylindrical body A404 is vertically welded to the probe circuit board A202. The bottom of the conductive cap A401 extends into the cylindrical body A404 from the top A405, and the bottom of the conductive cap A401 is provided with a limiting rolled edge A402 that matches the tapered top of the cylindrical body A404. The spring A403 is located inside the cylindrical body A404, and the upper and lower ends of the spring A403 support the conductive cap A401 and the probe circuit board A202, respectively.

[0124] The top of the probe body A1 is detachably connected to the probe interface A201 of the monitor body A2, and each spring probe A203 corresponds to a single annular conductive rail A103. When the spring probe A203 contacts the annular conductive rail A103, they are electrically connected. The spring A403 in the spring probe A203 makes close contact with the annular conductive rail A103 through the elastic support conductive cap A401, thereby increasing the reliability of the circuit connection.

[0125] In addition, to increase conductivity, the material of the cylinder A404 and the conductive cap A401 in the spring probe A203 is preferably copper alloy, and the material of the circular contact A102 and the annular conductive rail A103 on the conductive rail circuit board A101 is also preferably copper alloy.

[0126] Based on the above, the detachable structure of the probe body A1 and the monitor body A2 is optimized, specifically as follows:

[0127] The top of the probe body A1 is threaded into the probe interface A201 of the monitor body A2.

[0128] The top of the probe body A1 is inserted into the probe interface A201 of the monitor body A2.

[0129] Example 4

[0130] This embodiment is a further optimization based on embodiment 2, specifically:

[0131] The outer edges of the first side wing B7, the second side wing B8, and the third side wing B9 on the sealing ring B3 are all arc-shaped. The arc-shaped ends facilitate alignment and insertion of the corresponding filler, thus facilitating assembly.

[0132] In addition, the lengths of the first side wing B7 and the third side wing B9 can be greater than that of the second side wing B8, which further facilitates the squeezing of the second side wing B8 into the packing groove B4 to form a sealing effect.

[0133] The housing B1 and end cap B2 are made of resin to increase their corrosion resistance. The longitudinal section of the housing B1 and end cap B2 is teardrop-shaped. The teardrop-shaped structure allows small droplets that condense on the housing to drip quickly along the curved surface of the teardrop shape in some high-humidity working environments, thereby preventing water droplets from adhering to the housing surface for a long time and reducing the impact on the housing.

[0134] Example 5

[0135] This embodiment is a further optimization based on Embodiment 2, referring to... Figure 9 and Figure 10 The gas content detection device applied to three-dimensional monitoring in confined spaces also includes a point controller for the gas detector (which enables the gas detector to move in the height direction within the confined space to achieve three-dimensional monitoring), including a motor C1, a housing C2, a roller C3, a main shaft C5, and a limit switch C14.

[0136] An opening is provided on one side of the housing C2. The motor C1 is vertically mounted on the housing C2. The shaft of the motor C1 extends into the housing C2 and is connected to the worm gear C15. The roller C3 is fixed on the main shaft C5 and is rotatably connected to the inside of the housing C2 through the main shaft C5. A turbine C16 that cooperates with the worm gear C15 is installed on one side of the roller C3.

[0137] A steel wire rope is wound around the outer circumference of the drum C3. One end of the steel wire rope is fixed to the drum, and the other end of the steel wire rope is a free end that extends out from the opening of the housing C2.

[0138] One end of the main shaft C5 extends out of the housing C2 and is connected to the drive gear C6. On one side of the drive gear C6, there is a driven gear C9 and a limit gear C10 that are rotatably connected to the housing C2. The driven gear C9 has a top half tooth C7 and a bottom full tooth C8. The half tooth C7 and the full tooth C8 are arranged coaxially.

[0139] The full toothed part C8 meshes with the driving gear C6, and the half toothed part C7 meshes with the limiting gear C10. A paddle C11 is fixedly connected to one side of the limiting gear C10.

[0140] Limit switch C14 is located below limit gear C10 and is fixedly connected to housing C2. Limit switch C14 is switched by the rotation angle of lever C11. Limit switch C14 is connected in series in the power supply circuit of motor C1.

[0141] The mechanical winding and unwinding of the steel wire rope suspending the gas detector is achieved by driving the drum C3 to rotate via motor C1, thereby increasing work efficiency. During the winding and unwinding process, the drive gear C6, driven gear C9, and limit gear C10 work together to drive the lever C11 to rotate. Then, the lever C11 touches the limit switch C14 to stop the motor C1 in an emergency, thereby avoiding over-winding and over-winding faults during operation, thus protecting the invention and the gas detector.

[0142] Example 6

[0143] This embodiment further optimizes the structure of the limit switch 14 based on embodiment 5, specifically:

[0144] Reference Figure 9 The limit switch C14 includes an insulator C13, on which two inclined metal springs C12 are fixedly connected. The tops of the two metal springs C12 are free ends and are electrically connected in contact.

[0145] In this embodiment, the power supply circuit of motor C1 is turned on by two metal springs C12 connected by contact. When the lever C11 rotates, it touches the metal springs C12 and causes displacement, thereby closing the limit switch C14.

[0146] In addition, when the lever C11 rotates and touches one of the metal springs C12, the wire rope is completely retracted onto the drum C3, and when the lever C11 rotates and touches the other metal spring C12, the wire rope is completely released.

[0147] By matching the rotation angle of the lever C11 with the length of the wire rope, the power supply to the motor C1 can be actively disconnected when the wire rope is fully released and retracted.

[0148] In addition, a guide wheel C4 is rotatably connected to the front of the opening on the housing C2. The free end of the wire rope passes around the guide wheel C4 and is tied to the gas detector. The guide wheel C4 guides the wire rope, which not only makes the winding and unwinding of the wire smoother, but also prevents the wire rope from wearing down the housing C2 when it is close to it.

[0149] A bearing C17 is provided between the housing C2 and the spindle C5. By adding the bearing C17, the rotational friction between the housing C2 and the spindle C5 is reduced, making the spindle C5 rotate more smoothly.

[0150] The outer circumferential surface of the drum C3 is provided with a spiral groove that is compatible with the wire rope. By adding a spiral groove to the outer circumferential surface of the drum C3, the wire rope can be neatly wound around the drum C3 along the groove when winding up.

[0151] Example 7

[0152] Based on the structure of Embodiment 1, the gas detector also includes a gas detection module and a gas data remote transmission module; the gas detection circuit includes: a CO gas sensor, an O2 gas sensor, an H2S gas sensor, a CH4 gas sensor, as well as a gas detection circuit and an MCU main control circuit. Figure 12-15 As shown, the gas detection circuit further includes a CO gas detection circuit, an O2 gas detection circuit, an H2S gas detection circuit, and a CH4 gas detection circuit. Specifically, as... Figure 1 As shown, the CO gas detection circuit is connected to the output of the CO gas sensor to perform operational amplification of the output data. The CO gas detection circuit includes operational amplifier U5B and a quad operational amplifier U6A. The quad operational amplifier U6A is an LM324 chip. The positive input of operational amplifier U5B is connected to the reference voltage (+1.2V) of the CO gas sensor, and the negative input of operational amplifier U5B is connected to the output (CO-W terminal) of the CO gas sensor through a current-limiting resistor R11 (120Ω). The output of operational amplifier U5B is connected to the 1IN+ pin of the quad operational amplifier U6A through a current-limiting resistor R12 (100KΩ). The 1IN- pin of the quad operational amplifier U6A is connected to the 1OUT pin of the quad operational amplifier U6A. The VCC pin of the quad operational amplifier U6A is connected to a 3V DC power supply, and the GND pin of the quad operational amplifier U6A is connected to the AC neutral line.

[0153] In a preferred embodiment of the present invention, a feedback capacitor C14 and a feedback resistor R13 are connected in parallel between the negative input terminal and the output terminal of the operational amplifier U5B; wherein the capacitance value of the feedback capacitor C14 is 0.02uF and the resistance value of the feedback resistor R13 is 30K.

[0154] like Figure 13As shown, the O2 gas detection circuit is connected to the output terminal of the O2 gas sensor to perform operational amplification of the O2 gas sensor output data. The O2 gas detection circuit includes a quad operational amplifier U4A, which is an LM324 quad operational amplifier. The 1IN+ pin of the quad operational amplifier U4A is connected to the output terminal (O2-V+ terminal) of the O2 gas sensor through a current-limiting resistor R6 (1K resistance). The 1IN- pin of the quad operational amplifier U4A is grounded through a current-limiting resistor R8 (1K resistance). The VCC pin of the quad operational amplifier U4A is connected to a 3V DC power supply, and the GND pin of the quad operational amplifier U4A is connected to the AC neutral line.

[0155] In a preferred embodiment of the present invention, a feedback resistor R9 is provided between the 1IN- pin of the quad operational amplifier U4A and the output terminal of the quad operational amplifier U4A; wherein the resistance value of the feedback resistor R9 is 68K.

[0156] like Figure 14 As shown, the H2S gas detection circuit is connected to the output terminal of the H2S gas sensor to perform operational amplification of the H2S gas sensor output data. The H2S gas detection circuit includes operational amplifier U4B and quad operational amplifier U6B. The quad operational amplifier U6B is an LM324 quad operational amplifier. The positive input terminal of operational amplifier U4B is connected to the reference voltage value (+1.2V) of the H2S gas sensor, and the negative input terminal of operational amplifier U4B is connected to the output terminal (H2S-W terminal) of the H2S gas sensor through a current-limiting resistor R16 (specification: 33Ω-0.1%-25ppm). The output terminal of operational amplifier U4B is connected to the 1IN+ pin of quad operational amplifier U6B through a current-limiting resistor R18 (resistance value: 100K), and the 1IN- pin of quad operational amplifier U6B is connected to the 1OUT pin of quad operational amplifier U6B.

[0157] In a preferred embodiment of the present invention, a feedback capacitor C19 and a feedback resistor R17 are connected in parallel between the negative input terminal and the output terminal of the operational amplifier U4B; wherein the capacitance value of the feedback capacitor C19 is 0.02uF, and the specification of the feedback resistor R17 is 15KΩ-0.1%-25ppm.

[0158] like Figure 15As shown, the CH4 gas detection circuit is connected to the output terminal of the CH4 gas sensor to perform operational amplification of the output data from the CH4 gas sensor. The CH4 gas detection circuit includes a bias current amplifier U5A, which is an ADA4505 bias current amplifier chip. The +IN A pin of the bias current amplifier U5A is connected to the positive output terminal (CH4-S+ terminal) of the CH4 gas sensor via a current-limiting resistor R15 (2K resistance). The -IN A pin of the bias current amplifier U5A is connected to the negative output terminal (CH4-S- terminal) of the CH4 gas sensor via a current-limiting resistor R19 (2K resistance). The VCC pin of the bias current amplifier U5A is connected to a 3V DC power supply, and the GND pin is connected to the AC neutral line.

[0159] In a preferred embodiment of the present invention, a feedback resistor R20 is provided between the -IN A pin and the OUT A pin of the bias current amplifier U5A, and the resistance value of the feedback resistor R20 is 10K.

[0160] like Figure 16 As shown, Figure 16A circuit diagram of the MCU main control circuit is provided. It is worth noting that the MCU main control circuit collects data from the CO gas detection circuit, O2 gas detection circuit, H2S gas detection circuit, and CH4 gas detection circuit (i.e., the operationally amplified CO gas sensor, O2 gas sensor, H2S gas sensor, and CH4 gas sensor), and generates gas detection results through a pre-loaded processing program. Specifically, the MCU main control circuit uses an STM32F036 chip. The A0.0+ pin of the STM32F036 is connected to the output of the quad operational amplifier U6B in the H2S gas detection circuit, and the A0.0- pin is connected to a 1.2V DC power supply. The A1.0+ pin of the STM32F036 is connected to the output of the quad operational amplifier U6A in the CO gas detection circuit, and the A1.0- pin is connected to a 1.2V DC power supply. The A2.0+ pin of the STM32F036 is connected to the output of the quad operational amplifier U4A in the O2 gas detection circuit. The A2.0 pin of the STM32F036 is connected to the AC neutral line; the A3.0+ pin of the STM32F036 is connected to the output of the bias current amplifier U5A of the CH4 gas detection circuit; the A3.0 pin of the STM32F036 is connected to the AC neutral line; the VREF pin of the STM32F036 is connected to the 1.2V DC power supply; the AVSS pin of the STM32F036 is connected to the AC neutral line; the DVSS pin of the STM32F036 is grounded; the P2.5 pin of the STM32F036 is connected to the positive terminal of the first LED through the current-limiting resistor R4 (resistance value is 3KΩ), and the negative terminal of the first LED is grounded.

[0161] The gas data remote transmission module includes a control circuit, a wireless communication circuit, a clock circuit, and a remote control circuit connected to the control circuit. For example... Figure 18As shown, the chip model of the control circuit is MSP430F247; the MSP430F247 is equipped with two built-in 16-bit oscillators; specifically, oscillator Y1 is set between the XIN pin and the XOUT pin of the MSP430F247; oscillator Y2 is set between the XT2IN pin and the XT2OUT pin of the MSP430F247. The DVCC and AVCC pins of the MSP430F247 are connected to a 3.3V DC power supply; the DVSS and AVSS pins of the MSP430F247 are grounded. The DVCC pin is the positive terminal of the digital power supply voltage for the MSP430F247, and the DVSS pin is the negative terminal, used to power the internal electrical components of the MSP430F247. The AVCC pin is the positive terminal of the analog power supply voltage for the MSP430F247, and the AVSS pin is the negative terminal, used to power the internal analog electrical components of the MSP430F247.

[0162] Furthermore, in a preferred embodiment of the present invention, the P1.6 / TA1 pin of the MSP430F247 is also connected to the first LED1, wherein a constantly lit first LED1 indicates normal operation; the P1.5 / TA0 pin of the MSP430F247 is also connected to the second LED2, and a constantly lit second LED2 indicates a malfunction. Both the P1.5 / TA0 and P1.6 / TA1 pins are general-purpose digital pins.

[0163] And such Figure 19As shown, the wireless communication circuit chip is a Lora SX1278 communication module, which is a low-frequency transceiver for half-duplex transmission and is connected to the control circuit through an SPI bus interface. The LoRa SX1278's VDD pin is the module power supply pin, connected to a 3.3V DC power supply; the LoRa SX1278's RESET pin is the reset pin, connected to the MSP430F247's ACLK pin, and is active low; the LoRa SX1278's DIO0 pin is the output pin for data transmission completion and data reception completion interrupts, specifically connected to the MSP430F247's SVSOUT pin; the LoRa SX1278's SCK pin is the SPI bus clock pin, connected to the MSP430F247's UCB1 CLK pin, and is normally high; the LoRa SX1278's MISO pin is the SPI bus slave output pin, connected to the MSP430F247's UCB1 SOMI pin; the LoRa SX1278's MOSI pin is the SPI bus slave input pin, connected to the MSP430F247's UCB1 SIMO pin; and the LoRa... The NSS pin of the SX1278 is the SPI chip select input pin, which is connected to the SMCLK pin of the MSP430F247.

[0164] like Figure 20 As shown, the clock circuit uses a PCF8563T chip, which is a low-power CMOS real-time clock connected to the control circuit via an IIC bus interface. The PCF8563T includes an oscillator, with oscillator Y3 positioned between its OSCI (oscillator input) and OSCO (oscillator output) pins. The PCF8563T's INT pin is an interrupt output pin, connected to the MSP430F247's P1.3 / TA2 pins, and is active low. The PCF8563T's VDD pin (positive power supply) is connected to a 3.3V DC power supply. The PCF8563T's SCL pin is a serial clock input pin, connected to the MSP430F247's UCB0 SOMI pin. The PCF8563T's SDA pin is a serial data I / O pin, connected to the MSP430F247's UCB0 SIMO pin.

[0165] like Figure 21As shown, the remote control circuit uses a PT26-21B / TR8 chip. The CEV pin of the PT26-21B / TR8 is connected to the P1.1 / TA0 pin of the MSP430F247; the ECV pin of the PT26-21B / TR8 is grounded; the OUT pin of the PT26-21B / TR8 is connected to the CAOUT pin of the MSP430F247; the GND pin of the PT26-21B / TR8 is grounded; and the VCC pin of the PT26-21B / TR8 is connected to a 3.3V DC power supply.

[0166] Example 8

[0167] Based on Example 7, the gas detection circuit also includes a temperature and humidity sensor. Specifically, as shown in Example 7... Figure 6 As shown, the temperature and humidity sensor uses the SHT30 chip. The SDA pin of the SHT30 is connected to the P1.7 pin of the STM32F036, and the CLK pin of the SHT30 is connected to the P1.6 pin of the STM32F036. The gas detection circuit also further discloses a sensor interface circuit. (See diagram below.) Figure 17 As shown, the sensor interface circuit uses a dual-row 12-position socket to connect the output terminals of the CO gas sensor, O2 gas sensor, H2S gas sensor, positive output terminal of CH4 gas sensor, and negative output terminal of CH4 gas sensor to the gas detection circuit.

[0168] Example 9

[0169] Based on Embodiment 6, the gas data remote transmission module further discloses a display circuit included in the gas data remote transmission module. Specifically, as shown... Figure 22As shown, the display circuit uses the OLED12864 chip, specifically a 3.2-inch OLED display, which can preferably be connected to the control circuit via an 8080 bus interface. Specifically, the VDD pin of the OLED12864 is connected to a 13.5V DC power supply; the D0-D6 pins (OLED data pins) of the OLED12864 are connected to the TB0-TB6 pins of the MSP430F247, respectively; the D7 pin (OLED clock pin) of the OLED12864 is connected to the TBCLK pin of the MSP430F247; the ERD pin of the OLED12864 is connected to the UCB0 CLK pin of the MSP430F247; and the R / W pin of the OLED12864 is connected to the UCB0 CLK pin of the MSP430F247. The SET pin is connected; the D / C pin (OLED data / command control pin) of the OLED12864 is connected to the P2.7 / TA0 pin of the MSP430F247; the RESET pin (OLED reset pin, low-level reset) of the OLED12864 is connected to the ADC12CLK pin of the MSP430F247; the CS pin (OLED chip select pin) of the OLED12864 is connected to the Rosc pin of the MSP430F247; the VSS pin of the OLED12864 is grounded.

[0170] Furthermore, the storage circuitry included in the gas data remote transmission module is also disclosed. Specifically, such as... Figure 23 As shown, the memory circuit uses an 85RC128 chip, which is connected to the control circuit via an IIC bus interface. Specifically, the VDD pin of the 85RC128 is connected to a 3.3V DC power supply; the VSS pin is grounded; the WP pin (write-protect pin) of the 85RC128 is connected to the SMCLK pin of the MSP430F247; the SCL pin (serial clock pin) of the 85RC128 is connected to the UCB0 SOMI pin of the MSP430F247; and the SDA pin (serial data I / O pin) of the 85RC128 is connected to the UCB0 SIMO pin of the MSP430F247.

[0171] Furthermore, the power supply unit included in the gas data remote transmission module is also disclosed. For example... Figure 24As shown, the first terminal of the power supply unit is connected to a 9V DC power supply, and the third terminal of the power supply unit is grounded. A transient suppression diode D1, a Schottky diode D2, and capacitors C4 and C5 are connected in parallel between the first and third terminals of the power supply unit. In a preferred embodiment of the invention, a current-limiting resistor R6 is also provided between the first terminal of the power supply unit and the 9V DC power supply; the resistance value of the current-limiting resistor R6 is 2R. A fuse F1 is also provided between the third terminal of the power supply unit and ground; the maximum rated current of fuse F1 is 100mA, and the maximum rated power supply of fuse F1 is 24V. The transient suppression diode is model SMBJ15CA, and the Schottky diode is model SS14; the capacitance value of capacitor C4 is 0.1uF, and the capacitance value of capacitor C5 is 47uF.

[0172] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A gas content detection device for three-dimensional monitoring in confined spaces, characterized in that: It includes a gas detector that can be fixed or moved within a confined space and a processor connected via remote data transmission; the gas detector is used to detect gas content and transmit the collected signals, and the processor is used to receive the signals collected by the gas detector and perform data processing. The gas detectors fixedly distributed within the confined space can be one or multiple detectors spaced apart along the height direction; The gas detectors that are moved and distributed within the confined space are gas detectors that can be moved in a controlled manner in the height direction; The gas detector includes a probe body and a monitor body. The monitor body includes a gas detector housing with multiple sealing surfaces and a gas detection module and a gas data remote transmission module installed therein. The monitor body and the probe body are detachably connected. The gas detector housing with multiple sealing surfaces includes a housing, an end cap, and a sealing ring. One side of the housing has an opening, and a packing groove is provided on the end face of the opening. The end cap is detachably connected to the opening of the housing, and one side of the end cap has a positioning flange for insertion into the housing opening. A packing gap is left between the outer circumferential surface of the positioning flange and the inner circumferential surface of the housing opening. The sealing ring is placed between the housing and the end cap, and the width of the sealing ring is adapted to the end face of the housing opening. The outer edge of the sealing ring has a first side wing, which is tightly fitted to the outer circumferential surface of the housing. The middle of the sealing ring has a second side wing, which is tightly pressed into the packing groove. The inner edge of the sealing ring has a third side wing, which is tightly pressed into the packing gap.

2. The gas content detection device for three-dimensional monitoring in confined spaces according to claim 1, characterized in that: The detachable connection between the monitor body and the probe body is as follows: The probe body has a cylindrical structure, and a conductive rail circuit board is provided on the top of the probe body. The conductive rail circuit board and the probe body are located on the same axis. Multiple concentrically arranged annular conductive rails are laid on the upper surface of the conductive rail circuit board. The bottom of the monitor body has an annular protruding probe interface. A probe circuit board is provided inside the probe interface. The probe circuit board has the same number of spring probes as the annular conductive rails. The top of the probe body is detachably connected to the probe interface of the monitor body, and each spring probe corresponds to a separate annular conductive rail. The spring probe is electrically connected when it contacts the annular conductive rail.

3. The gas content detection device for three-dimensional monitoring in confined spaces according to claim 1, characterized in that: The housing, end cap, and sealing ring are provided with a set of bolt holes and are detachably connected by bolts; the outer edges of the first side wing, second side wing, and third side wing of the sealing ring are all arc surfaces; the lengths of the first side wing and the third side wing are greater than that of the second side wing. The housing and end caps are made of resin material; the longitudinal section of the housing and end caps is teardrop-shaped.

4. The gas content detection device for three-dimensional monitoring in confined spaces according to claim 2, characterized in that: The spring probe includes a conductive cap, a spring, and a cylinder; The top of the cylinder is tapered, and the bottom of the cylinder is vertically welded to the probe circuit board. The bottom of the conductive cap extends into the cylinder from the top of the cylinder, and the bottom of the conductive cap is provided with a limiting rolled edge that matches the tapered top of the cylinder. The spring is located inside the cylinder, and the upper and lower ends of the spring support the conductive cap and the probe circuit board, respectively. The conductive rail circuit board has a circular contact arranged coaxially in the middle of the annular conductive rail, and the probe circuit board also has a spring probe corresponding to the position of the circular contact.

5. The gas content detection device for three-dimensional monitoring in confined spaces according to claim 1, characterized in that: The gas content detection device for three-dimensional monitoring of confined spaces also includes a point controller for the gas detector, which includes a motor, housing, roller, main shaft and limit switch; The housing has an opening on one side. The motor is vertically mounted on the housing. The motor shaft extends into the housing and is connected to a worm gear. The roller is fixed on the main shaft and is rotatably connected to the inside of the housing through the main shaft. A turbine that cooperates with the worm gear is installed on one side of the roller. A steel wire rope is wound around the outer circumference of the roller, and the free end of the steel wire rope extends out from the opening of the housing. One end of the main shaft extends out of the housing and is connected to a drive gear. A driven gear and a limiting gear are rotatably connected to the housing on one side of the drive gear. The driven gear has a full tooth section and a half tooth section arranged coaxially. The full tooth section meshes with the drive gear, and the half tooth section meshes with the limiting gear. A paddle is fixedly connected to one side of the limiting gear. The limit switch is fixedly connected to the housing below the limit gear, and the limit switch is switched by the rotation angle of the lever. The limit switch is connected in series in the power supply circuit of the motor.

6. The gas content detection device for three-dimensional monitoring in confined spaces according to claim 5, characterized in that: The limit switch includes an insulator, on which two inclined metal springs are fixedly connected, and the tops of the two metal springs are electrically connected in contact. When the paddle rotates and touches one of the metal springs, the steel wire rope is completely retracted onto the drum; when the paddle rotates and touches the other metal spring, the steel wire rope is completely released.

7. The gas content detection device for three-dimensional monitoring in confined spaces according to claim 1, characterized in that: The gas detection module includes: a CO gas sensor, an O2 gas sensor, an H2S gas sensor, a CH4 gas sensor, as well as a gas detection circuit and an MCU main control circuit. The gas detection circuit includes a CO gas detection circuit, an O2 gas detection circuit, an H2S gas detection circuit, and a CH4 gas detection circuit; The gas data remote transmission module includes: a control circuit, and a wireless communication circuit, a clock circuit, and a remote control circuit, which are respectively connected to the control circuit.

8. The gas content detection device for three-dimensional monitoring in confined spaces according to claim 7, characterized in that: In the gas detection module: It also includes temperature and humidity sensors; It also includes: a sensor interface circuit; the sensor interface circuit uses a double-row 12-position socket, which is used to introduce the output terminals of the CO gas sensor, the O2 gas sensor, the H2S gas sensor, the positive output terminal of the CH4 gas sensor, and the negative output terminal of the CH4 gas sensor into the gas detection circuit; It also includes: display circuitry; In the gas data remote transmission module; It also includes: storage circuitry; It also includes: a power supply unit; The first terminal of the power supply unit is connected to a 9V DC power supply, and the third terminal of the power supply unit is grounded. A transient suppression diode D1, a Schottky diode D2, a capacitor C4, and a capacitor C5 are also connected in parallel between the first terminal and the third terminal of the power supply unit.

9. A method for detecting gas content in confined space three-dimensional monitoring, characterized in that: The specific steps of using the gas content detection device according to any one of claims 1-8 are as follows: (1) Arrange multiple gas detectors at intervals along the height direction in a confined space, or install a gas detector movably in a confined space and make it movable in the height direction; achieve gas content detection at different height positions through the above two installation methods; (2) The gas detector transmits the collected signals to the processor for processing through data transmission, thereby enabling the monitoring of gas content in the confined space.

Images