A mobile combustible gas alarm detector

Abstract

The application belongs to the technical field of combustible gas alarm detection, and particularly relates to a mobile combustible gas alarm detector, which comprises a base, a stand and a support arranged on the base, a photovoltaic panel arranged at the top end of the stand, a storage battery detachably arranged on the base, a detector main body fixedly arranged on the support, a detection end arranged on the detector main body, a gas feeding mechanism detachably arranged on the detection end, and a gas filtering mechanism fixedly arranged at the bottom of the gas feeding mechanism. The application actively sucks and locally samples air by means of a fan, avoids air dilution, and reduces equipment cost. The filter paper automatically intercepts pollutants and cooperates with a gas pressure sensor to realize automatic replacement, thereby reducing manual maintenance. A motor drives swing sampling to eliminate detection blind area. An encoder realizes closed-loop control to accurately replace the paper, thereby reducing waste of consumables. Photovoltaic power supply supports independent outdoor operation. Wireless networking realizes multi-point linkage early warning, and effectively improves the systematicness of large-scale monitoring and the efficiency of emergency response.

Description

Technical Field

[0001] The present invention relates to the technical field of combustible gas alarm detection, and in particular to a mobile combustible gas alarm detector. Background Art

[0002] Combustible gas alarm detectors are widely used in places with risks of combustible gas leakage such as petroleum, chemical industry and gas industry, and are important monitoring equipment for guaranteeing production safety and the safety of personnel's lives and properties. In the prior art, the detection end of a combustible gas alarm detector is usually directly exposed to ambient air, and particulate matters such as dust and oil mist in the air are prone to adhere to the surface of the detection end. After long-term accumulation, the detection sensitivity and accuracy will be reduced, leading to false alarms or missed alarms. To solve this problem, some detectors are provided with a filter screen at the front end of the detection end. However, as the service time prolongs, the filter screen itself will be blocked due to adhesion of pollutants, requiring manual regular disassembly for cleaning or replacement, which results in high maintenance frequency and inconvenient operation. Moreover, after the filter screen is blocked, the smoothness of air flow will be affected, thereby affecting the detection response speed.

[0003] In addition, existing mobile combustible gas alarm detectors have obvious deficiencies in sampling methods. Most detectors adopt open-type natural diffusion sampling, and the ambient air around the detection end is prone to mix and dilute with the sampling gas, so that the concentration of combustible gas entering the detection end is lower than the actual leakage concentration, thereby resulting in underestimation of the concentration and potential safety hazards. If a high-precision analytical instrument is used for detection, the equipment cost is high, which is not conducive to large-scale promotion and application. Meanwhile, the sampling direction of existing detectors is usually fixed, making it difficult to conduct flexible detection on multiple directions, and detection blind areas are prone to occur. Furthermore, most existing detectors operate in an independent working mode and lack wireless networking capabilities, so that the monitoring data of multiple detectors cannot be centrally managed and collaboratively warned, and it is difficult to meet the linkage response requirements in large-scale, multi-node security monitoring scenarios.

[0004] In addition, most existing detectors are equipped with a single sensor, and cannot simultaneously detect multiple risks such as crude oil leakage volatiles, combustible gas explosion hazards and hydrogen sulfide poisoning; and most of them rely on wired power supply and fixed wiring installation, making it difficult to adapt to rapid deployment in outdoor places without power supply; meanwhile, they lack efficient wireless data linkage with SCADA systems, and cannot meet the requirements of remote centralized monitoring and emergency scheduling in large-scale multi-risk scenarios. Therefore, the present application provides a mobile combustible gas alarm detector. Summary of the Invention

[0005] To solve the disadvantages existing in the prior art, the present invention provides a mobile combustible gas alarm detector.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a mobile combustible gas alarm detector, comprising a base, a column and a bracket on the base, a photovoltaic panel on the top of the column, a battery detachably installed on the base, a detector body fixedly installed on the bracket, a detection end on the detector body, a gas supply mechanism detachably installed on the detection end, a gas filter mechanism fixedly installed at the bottom of the gas supply mechanism, and a wireless communication module inside the detector body for transmitting detection data and alarm signals wirelessly, and supporting wireless networking communication with adjacent detector bodies and a remote monitoring center; The photovoltaic panel, detector body, and battery are electrically connected. The air supply mechanism is used to deliver external air to the detection end after it has been filtered by the air filtration mechanism. The air filtration mechanism has a partial suction structure and a reusable filter paper to keep the air entering the air supply mechanism at its original concentration that has not been diluted by the ambient air. The detection end is used to detect the concentration of combustible gas in the undiluted air and to trigger an alarm by the detector body when the concentration exceeds the limit. The air supply mechanism is equipped with a pressure sensor to detect the airflow pressure in order to control the replacement of the filter paper in the air filtration mechanism.

[0007] Preferably, the air supply mechanism includes a circular tube fixedly sleeved on the detection end, a rectangular cover fixedly connected to the bottom end of the circular tube, a crossbeam, a cone, and a retaining ring fixedly installed inside the circular tube, the cone being located above the crossbeam and below the retaining ring, the detection end abutting against the retaining ring, a fan fixedly installed on the crossbeam, multiple air outlets arranged in a circumferential array on the inner wall of the circular tube, the multiple air outlets being located between the retaining ring and the cone, an annular box fixedly sleeved on the outer side of the circular tube, the inner side of the annular box being open and connected to the multiple air outlets, an air outlet pipe penetrating and fixedly installed on the annular box, and a pressure sensor penetrating and fixedly installed on the air outlet pipe.

[0008] Preferably, the air filtration mechanism includes a rectangular tube fixedly installed at the bottom of a rectangular cover, two horizontal plates fixedly installed inside the rectangular tube, a circular box rotatably installed between the two horizontal plates, a rectangular air inlet pipe fixedly installed through the circular box, a rectangular outlet opened on the circular box, a grid plate fixedly installed inside the rectangular tube, and a rectangular transfer pipe slidably installed between the grid plate and the circular box.

[0009] Preferably, an opening box one and an opening box two are fixedly installed on both sides of the rectangular tube, and a take-up roller and an unwind roller are respectively installed in the opening box one and the opening box two with damping rotation. A rectangular opening one is opened on the inner wall of both sides of the rectangular tube. The opening box one and the opening box two are respectively connected to the inside of the rectangular tube through the corresponding rectangular opening one. The filter paper is wound on the unwind roller and the take-up roller. The two ends of the filter paper are fixedly connected to the unwind roller and the take-up roller respectively. The filter paper passes through the rectangular tube through the two rectangular openings one. A motor one is fixedly installed on the side of the opening box one near the column. The output shaft of the motor one rotates through the opening box one and is fixedly connected to the end of the take-up roller.

[0010] Preferably, a licker roller and a smooth roller are rotatably installed inside the rectangular tube, the filter paper passes around the licker roller and the smooth roller and is located above the licker roller and the smooth roller, an encoder is fixedly installed on the side of the rectangular tube near the column, and the end of the smooth roller is fixedly connected to the encoder input shaft.

[0011] Preferably, the inner walls of both sides of the rectangular tube are provided with rectangular openings II, and rollers are slidably installed in both rectangular openings II. The two rollers are rotatably connected to both sides of the rectangular transfer tube. A bellows plate I and a bellows plate II are fixedly installed on both sides of the rectangular transfer tube. The rollers pass through the bellows plate I and are rotatably connected to the bellows plate I. A baffle plate I, a baffle plate II, and a baffle plate III are fixedly installed on both sides of the inner walls of the rectangular tube. The rectangular transfer tube is slidably installed between baffle plate I and baffle plate II, and the bellows plate II is slidably installed between baffle plate II and baffle plate III.

[0012] Preferably, shafts are fixedly installed on both sides of the circular box, and both shafts pass through the rectangular tube and are rotatably connected to it. A swing arm is fixedly installed at the end of both shafts. A frame is fixedly installed on the side of the rectangular tube near the column. A second motor is fixedly installed on the frame. The output shaft of the second motor is fixedly connected to the adjacent swing arm. A strip hole is opened on the swing arm, and two rollers are respectively rotatably installed in the corresponding strip hole.

[0013] Preferably, baffles are fixedly installed on the inner walls of both sides of the rectangular tube, and the two swing arms support the filter paper and fit it against the bottom of the grid plate.

[0014] Preferably, the lower end face of the detection end abuts against the upper end face of the retaining ring.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes a fan in the gas delivery mechanism for active suction, combined with a rectangular air inlet pipe in the filtration mechanism for localized, small-scale sampling. This ensures that the air entering the gas delivery mechanism maintains its original concentration, undiluted by ambient air. The detection head directly measures the combustible gas concentration in this undiluted air, effectively avoiding concentration underestimation caused by gas diffusion and dilution. Under these conditions, a conventional, low-cost detector body can meet the detection requirements, eliminating the need for expensive high-precision analytical instruments. This reduces equipment manufacturing and maintenance costs while ensuring safe monitoring.

[0016] This invention effectively intercepts large particles of dust and oil mist in the rising airflow by incorporating replaceable filter paper in the air filtration mechanism, preventing them from adhering to the bottom of the detection head and ensuring that the detection accuracy of the detection head is not affected by contaminants. Simultaneously, a pressure sensor on the outlet pipe monitors the airflow pressure in real time. When the filter paper becomes clogged and the pressure falls below a threshold, a motor automatically drives the take-up roller to rotate, winding up the dirty filter paper and simultaneously releasing clean filter paper. This achieves automatic filter paper replacement without manual intervention, significantly reducing maintenance frequency and operational complexity.

[0017] This invention utilizes a second motor to drive a cylindrical box to reciprocate around its own axis, causing the lower end of the rectangular air inlet pipe to periodically change orientation. This allows for alternating sampling of air from different locations and angles, avoiding detection blind spots caused by long-term fixed-direction air intake. Simultaneously, the second motor, via a swing arm and rollers, drives the rectangular transfer tube to move synchronously back and forth, ensuring that the inlet of the rectangular transfer tube remains aligned with the direction of the rectangular outlet, guaranteeing the continuity and sealing of airflow and improving the reliability and comprehensiveness of the detection.

[0018] This invention employs an encoder in conjunction with a light roller to precisely measure the number of rotations of the licker roller when the take-up roller rewinds the soiled filter paper. This measurement is then used to calculate the rewind length, achieving closed-loop control. This ensures that only the soiled portion is replaced each time the paper is changed, guaranteeing filtration efficiency while avoiding waste of clean filter paper and further reducing consumable costs. The photovoltaic panel converts solar energy into electrical energy to continuously charge the battery, enabling the entire machine to operate independently outdoors for extended periods. It is suitable for various mobile inspection scenarios without external power sources, and features energy efficiency, environmental friendliness, and strong adaptability.

[0019] This invention, by incorporating a wireless communication module within the detector body, enables the detector body to establish a wireless network communication capability. Multiple detector bodies can automatically form a wireless monitoring network, achieving real-time sharing and remote transmission of detection data, alarm signals, and equipment status. When a detector body detects an excessive concentration of combustible gas, it not only issues an audible and visual alarm but also simultaneously transmits the alarm information to adjacent detector bodies and a remote monitoring center via the wireless network, achieving multi-point coordinated early warning and centralized monitoring. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a mobile combustible gas alarm detector proposed in this invention. Figure 2 This is a schematic diagram of the detector body, gas supply mechanism, and gas filtration mechanism in a mobile combustible gas alarm detector proposed in this invention. Figure 3 This is a side sectional view of the gas supply mechanism and gas filtration mechanism in a mobile combustible gas alarm detector proposed in this invention. Figure 4 This is a side sectional view of the gas filtering mechanism in a mobile combustible gas alarm detector proposed in this invention. Figure 5 This is a schematic diagram of the gas supply mechanism and gas filtration mechanism in a mobile combustible gas alarm detector proposed in this invention.

[0021] In the diagram: 1. Base; 2. Column; 3. Photovoltaic panel; 4. Bracket; 5. Battery; 6. Detector body; 61. Detection end; 7. Air supply mechanism; 8. Air filtration mechanism; 71. Circular tube; 711. Air outlet; 72. Rectangular cover; 73. Horizontal frame; 74. Fan; 75. Conical cylinder; 76. Retaining ring; 77. Annular box; 78. Air outlet pipe; 79. Air pressure sensor; 81. Rectangular tube; 82. Horizontal plate; 83. Circular box; 831. Rectangular air inlet pipe; 832. Rectangular outlet; 84. Open box one; 85. Open 86. Unwinding roller; 87. Rewinding roller; 88. Motor 1; 89. Filter paper; 810. Gussing roller; 811. Smooth roller; 812. Grating plate; 813. Rectangular opening 1; 814. Rectangular transfer tube; 815. Baffle 1; 816. Baffle 2; 817. Baffle 3; 818. Bellows 1; 819. Bellows 2; 820. Encoder; 821. Frame; 822. Motor 2; 823. Swing arm; 8231. Strip hole; 824. Roller; 825. Rectangular opening 2; 826. Baffle 4. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please refer to Figures 1-5The present invention provides a technical solution: a mobile combustible gas alarm detector, including a base 1, a column 2 and a bracket 4 on the base 1, a photovoltaic panel 3 on the top of the column 2, a battery 5 detachably installed on the base 1, a detector body 6 fixedly installed on the bracket 4, a detection end 61 on the detector body 6, a gas supply mechanism 7 detachably installed on the detection end 61, a gas filter mechanism 8 fixedly installed at the bottom of the gas supply mechanism 7, and a wireless communication module inside the detector body 6 for transmitting detection data and alarm signals wirelessly, and supporting wireless networking communication with adjacent detector bodies 6 and a remote monitoring center; The detector body 6 integrates an oxygen negative ion exchange module, a high-sensitivity linear semiconductor sensor, an infrared sensor, and an electrochemical sensor, which are used to detect crude oil spill volatiles, the concentration of combustible gas explosion hazards, and the concentration of hydrogen sulfide toxic gas, respectively. The detector body 6 also contains a low-power, low-noise preamplifier to integrate and amplify the output signals of the three sensors and suppress external electromagnetic interference and cross-interference between the three sensors. The detector body 6 employs highly integrated chip and PCB design technology, integrating the three sensors, preamplifier, signal processing circuit, control module, and communication module into the same housing. Its modular design allows for flexible configuration of enabling or disabling the three detection functions. The detector body 6 also includes a 4G Cat.1 wireless communication module for uploading the three concentration signals to the SCADA system in real time and supports remote parameter configuration and alarm linkage. The photovoltaic panel 3, detector body 6, and battery 5 are electrically connected to form a micro photovoltaic energy storage system, providing independent power to the detector body 6. The air supply mechanism 7 is used to deliver external air to the detection end 61 after it has been filtered by the air filter mechanism 8. The air filter mechanism 8 has a partial suction structure and a reusable filter paper 89, which keeps the air entering the air supply mechanism 7 at its original concentration that has not been diluted by the ambient air. The detection end 61 has the above three sensors built in, which are used to detect the concentration of various combustible and toxic gases in the undiluted air, and the detector body 6 will alarm when any concentration exceeds the standard. The air supply mechanism 7 is equipped with a pressure sensor 79, which is used to detect the airflow pressure to control the replacement of the filter paper 89 in the air filter mechanism 8. The detector body 6 does not require an external power supply or wiring installation, and is suitable for various outdoor locations without electricity.

[0024] The air supply mechanism 7 includes a circular tube 71 fixedly sleeved on the detection end 61. A rectangular cover 72 is fixedly connected to the bottom end of the circular tube 71. A cross frame 73, a cone 75, and a retaining ring 76 are fixedly installed inside the circular tube 71. The cone 75 is located above the cross frame 73 and below the retaining ring 76. The detection end 61 abuts against the retaining ring 76. A fan 74 is fixedly installed on the cross frame 73. Multiple air outlets 711 are arranged in a circumferential array on the inner wall of the circular tube 71. The multiple air outlets 711 are located between the retaining ring 76 and the cone 75. An annular box 77 is fixedly sleeved on the outer side of the circular tube 71. The inner side of the annular box 77 is open and connected to the multiple air outlets 711. An air outlet pipe 78 is installed through and fixedly installed on the annular box 77. A pressure sensor 79 is installed through and fixedly installed on the air outlet pipe 78.

[0025] The detector body 6 houses a control module and an alarm module. The detection end 61 transmits the detected combustible gas concentration signal to the control module. The control module compares the received concentration value with a preset safety threshold. When the concentration value exceeds the safety threshold, the control module drives the alarm module to issue an audible and visual alarm signal. Under the control of the control module, the wireless communication module transmits detection data, alarm signals, equipment status information, and geographical location information wirelessly to adjacent detector bodies 6 or a remote monitoring center, achieving multi-node data aggregation and collaborative early warning. The pressure sensor 79 transmits the detected pressure signal to the control module in real time. The control module determines the degree of clogging of the filter paper 89 based on the pressure signal and controls the start and stop of the motor 88, forming a closed-loop control circuit. The fan 74, under the control of the control module, can adjust its speed to adapt to the airflow requirements in different environments.

[0026] The air filtration mechanism 8 includes a rectangular tube 81 fixedly installed at the bottom of a rectangular cover 72. Two horizontal plates 82 are fixedly installed inside the rectangular tube 81. A circular box 83 is rotatably installed between the two horizontal plates 82. A rectangular air inlet pipe 831 is fixedly installed through the circular box 83. A rectangular outlet 832 is opened on the circular box 83. A grille plate 812 is fixedly installed inside the rectangular tube 81. A rectangular transfer pipe 814 is slidably installed between the grille plate 812 and the circular box 83.

[0027] The bottom end of the rectangular air inlet pipe 831 is the air inlet, and its cross-sectional area is smaller than that of the rectangular pipe 81 to ensure a stable airflow velocity during the suction process and prevent large-scale mixing with the surrounding air. The grid plate 812 is used to support the filter paper 89 and provide pores for airflow, ensuring that the filtered air can flow upwards uniformly. The rectangular transfer pipe 814 is slidably installed between the grid plate 812 and the circular box 83, with its top end maintaining a gap with the bottom of the grid plate 812 and its bottom end facing the rectangular outlet 832 of the circular box 83, to guide the air discharged from the circular box 83 to below the filter paper 89.

[0028] An opening box 1 84 and an opening box 2 85 are fixedly installed on both sides of the rectangular tube 81, respectively. A take-up roller 87 and an unwind roller 86 are respectively installed in the opening box 1 84 and the opening box 2 85 with damping rotation. A rectangular opening 1 813 is opened on the inner wall of both sides of the rectangular tube 81. The opening box 1 84 and the opening box 2 85 are respectively connected to the inside of the rectangular tube 81 through the corresponding rectangular opening 1 813. Filter paper 89 is wound on the unwind roller 86 and the take-up roller 87. The two ends of the filter paper 89 are fixedly connected to the unwind roller 86 and the take-up roller 87, respectively. The filter paper 89 passes through the rectangular tube 81 through the two rectangular openings 1 813. A motor 1 88 is fixedly installed on the side of the opening box 1 84 near the column 2. The output shaft of the motor 1 88 rotates through the opening box 1 84 and is fixedly connected to the end of the take-up roller 87.

[0029] The unwinding roller 86 and the winding roller 87 are rotatably mounted in the second opening box 85 and the first opening box 84, respectively, via damping bearings. The damping bearings provide appropriate rotational resistance, ensuring the filter paper 89 maintains proper tension during winding and preventing it from loosening or shifting. Both the first opening box 84 and the second opening box 85 are sealed enclosures, with sealing gaskets at their connections to the rectangular tube 81 to prevent unfiltered external air from directly entering the air passage. The first motor 88 is a reversible motor; after winding is complete, it can release the tension of the filter paper 89 by reversing the rotation angle, preventing permanent deformation of the filter paper 89 due to prolonged tension.

[0030] A licker roller 810 and a smooth roller 811 are rotatably mounted inside a rectangular tube 81. Filter paper 89 passes around the licker roller 810 and the smooth roller 811 and is located above the licker roller 810 and the smooth roller 811. An encoder 820 is fixedly mounted on the side of the rectangular tube 81 near the column 2. The end of the smooth roller 811 is fixedly connected to the input shaft of the encoder 820.

[0031] The surface of the licker roller 810 is provided with several protrusions to increase the friction between it and the filter paper 89, ensuring that the filter paper 89 can reliably drive the licker roller 810 to rotate during the winding process and avoid slippage. The smooth roller 811 is a smooth roller body that works in conjunction with the licker roller 810 to guide and press the filter paper 89. The encoder 820 is a rotary encoder that converts the rotation angle of the smooth roller 811 into an electrical signal and transmits it to the control module. The control module calculates the number of rotations of the licker roller 810 based on the pulse signal fed back by the encoder 820, and calculates the winding length of the filter paper 89 by combining the circumference of the licker roller 810, thereby achieving precise control of the winding length.

[0032] Rectangular openings 825 are provided on both inner walls of the rectangular tube 81. Rollers 824 are slidably installed in both rectangular openings 825. The two rollers 824 are rotatably connected to both sides of the rectangular transfer tube 814. A bellows plate 818 and a bellows plate 819 are fixedly installed on both sides of the rectangular transfer tube 814. The rollers 824 pass through the bellows plate 818 and are rotatably connected to it. A baffle 815, a baffle 816, and a baffle 817 are fixedly installed on both inner walls of the rectangular tube 81. The rectangular transfer tube 814 is slidably installed between the baffles 815 and 816. The bellows plate 819 is slidably installed between the baffles 816 and 817.

[0033] Both the first bellows plate 818 and the second bellows plate 819 are foldable flexible sealing plates. They unfold or fold as the rectangular transfer tube 814 moves left and right, ensuring the free sliding of the rectangular transfer tube 814 while effectively preventing airflow leakage from both sides of the rectangular transfer tube 814. The first baffle 815, the second baffle 816, and the third baffle 817 are sealing baffles fixedly installed on the inner wall of the rectangular tube 81. They cooperate with the first bellows plate 818 and the second bellows plate 819 to seal the gap between the rectangular transfer tube 814 and the inner wall of the rectangular tube 81, ensuring that all airflow flows upward through the rectangular transfer tube 814.

[0034] Both sides of the round box 83 are fixedly installed with shafts. Both shafts pass through the rectangular tube 81 and are rotatably connected to it. Both ends of the shafts are fixedly installed with swing arms 823. A frame 821 is fixedly installed on the side of the rectangular tube 81 near the column 2. A second motor 822 is fixedly installed on the frame 821. The output shaft of the second motor 822 is fixedly connected to the adjacent swing arm 823. A strip hole 8231 is opened on the swing arm 823. Two rollers 824 are respectively rotatably installed in the corresponding strip hole 8231.

[0035] Motor 822 is a stepper motor or servo motor. Under the control of the control module, it switches between forward and reverse rotation according to a preset timing and angle to achieve precise control of the swing angle and speed of the circular box 83. The length of the strip hole 8231 is greater than the diameter of the roller 824. When the swing arm 823 swings, the roller 824 rolls in the strip hole 8231 and slides along the rectangular opening 825, converting the swing motion of the swing arm 823 into the linear reciprocating motion of the rectangular transfer tube 814. The frame 821 is fixedly installed on the outer wall of the rectangular tube 81 to support motor 822 and provide a stable mounting base.

[0036] Baffles 826 are fixedly installed on both inner walls of the rectangular tube 81, and two swing arms 823 support filter paper 89 and fit against the bottom of the grid plate 812.

[0037] Baffle 4 826 is a limiting baffle fixedly installed on the inner wall of rectangular tube 81. It is located below and parallel to grid plate 812. The gap between baffle 4 826 and grid plate 812 is used to accommodate filter paper 89. Baffle 4 826 supports filter paper 89 from below, so that filter paper 89 remains in close contact with the bottom of grid plate 812 under the impact of airflow, preventing filter paper 89 from detaching from grid plate 812 due to airflow impact and causing filtration failure.

[0038] The lower end face of the detection end 61 abuts against the upper end face of the retaining ring 76.

[0039] A sealing gasket is provided between the lower end face of the detection end 61 and the upper end face of the retaining ring 76 to ensure the airtightness between the detection end 61 and the circular tube 71, preventing air leakage from the connection between the detection end 61 and the circular tube 71. The inner diameter of the retaining ring 76 is larger than the detection surface diameter of the detection end 61, so that the air discharged from the cone 75 can fully contact the detection surface of the detection end 61 before being discharged from the air outlet 711, ensuring the sufficiency and accuracy of the detection.

[0040] In this embodiment: the photovoltaic panel 3 converts light energy into electrical energy under sunlight to continuously charge the battery 5; the battery 5, as the core energy source of the whole machine, provides stable operating voltage for the main detector body 6, motor 1 88, motor 2 822, encoder 820, air pressure sensor 79 and fan 74, ensuring that all electrical components work together.

[0041] When the fan 74 starts operating, a negative pressure zone is formed in the space below it. Under atmospheric pressure, external air flows sequentially through the rectangular inlet pipe 831, the circular box 83, and the rectangular outlet 832, and then enters the rectangular transfer pipe 814 and flows upward. The rising airflow first passes through the filter paper 89, which intercepts large particles of dust, oil mist, and other pollutants in the air. The purified air continues to rise, is accelerated by the fan 74, and is discharged from the cone 75, impacting the detection end 61 at a certain flow rate. The detection end 61 has a built-in gas-sensitive element that senses the concentration of combustible gas in the air in real time. Once the concentration exceeds the preset safety threshold, the detector body 6 immediately triggers an audible and visual alarm signal. At the same time, the wireless communication module sends the alarm signal and detection data to the adjacent detector body 6 and the remote monitoring center to achieve multi-point linkage alarm. The air that has exchanged air with the detection end 61 then flows through multiple air outlets 711 on the side wall of the circular pipe 71 into the annular box 77, and is finally discharged to the outside through the outlet pipe 78, forming a complete air circulation.

[0042] While the blower 74 continuously draws air, the second motor 822 rotates synchronously, its rotation direction intermittently reversing according to a set sequence, thereby driving the cylindrical box 83 to oscillate back and forth around its own axis. The oscillation of the cylindrical box 83 causes the lower end of the rectangular air inlet pipe 831 to periodically change orientation, thus achieving alternating sampling of air from different directions and angles, avoiding detection blind spots caused by long-term fixed-direction air intake. At the same time, the second motor 822 drives the roller 824 through two swing arms 823, forcing the rectangular transfer pipe 814 to move back and forth left and right inside the rectangular pipe 81, ensuring that no matter how the rectangular outlet 832 deflects, the inlet of the rectangular transfer pipe 814 always faces the rectangular outlet 832, ensuring smooth and unobstructed upward airflow and reducing leakage or bypass losses.

[0043] During the filtration process, filter paper 89 continuously traps contaminants. Dust and oil mist adhering to its surface gradually accumulate, leading to decreased air permeability and increased airflow resistance. A pressure sensor 79 installed on the outlet pipe 78 monitors the static pressure of the airflow in real time; this pressure value directly reflects the degree of clogging of the filter paper 89. When the pressure falls below the system's set lower threshold, the control system determines that the filter paper 89 is severely clogged and immediately starts motor 88, driving the take-up roller 87 to rotate and roll up the contaminated filter paper 89 below the grid plate 812. Simultaneously, a clean filter paper 89 of equal length is released from the unwind roller 86 and automatically spread to the working position. During the winding process, friction is generated between the filter paper 89 and the licker roller 810, driving the licker roller 810 to rotate. The encoder 820 accurately measures the number of rotations of the licker roller 810 and calculates the winding length accordingly, feeding back a signal to motor 88 to achieve closed-loop control. This ensures that only the contaminated portion is replaced each time the paper is changed, guaranteeing filtration efficiency while avoiding waste of clean filter paper 89.

[0044] Because the rectangular air inlet pipe 831 only draws in air from a small, localized area at a time, this air does not mix with the surrounding air before entering the gas path, thus maintaining a high initial concentration. The detection tip 61 directly measures this undiluted gas, effectively avoiding concentration underestimation caused by gas diffusion and dilution. Under these conditions, a conventional, low-cost detector body 6 can meet the detection requirements, eliminating the need for expensive high-precision analytical instruments. This reduces equipment manufacturing and maintenance costs while ensuring safe monitoring.

[0045] Furthermore, the multi-node networking function enabled by the wireless communication module allows multiple detector bodies 6 to communicate and work collaboratively, uploading concentration data, alarm status, and equipment information from each monitoring point to a remote monitoring center in real time. This facilitates centralized monitoring and unified scheduling by management personnel. When one detector body 6 triggers an alarm, adjacent detector bodies 6 can receive the alarm signal and issue a synchronized warning through wireless networking, effectively improving the safety monitoring coverage and emergency response efficiency over a large area.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A mobile combustible gas alarm detector, comprising a base (1), characterized in that: The base (1) is provided with a column (2) and a bracket (4). A photovoltaic panel (3) is provided at the top of the column (2). A storage battery (5) is detachably installed on the base (1). A detector body (6) is fixedly installed on the bracket (4). A detection end (61) is provided on the detector body (6). An air supply mechanism (7) is detachably installed on the detection end (61). An air filter mechanism (8) is fixedly installed at the bottom of the air supply mechanism (7). A wireless communication module is provided inside the detector body (6) for transmitting detection data and alarm signals to the outside wirelessly. The photovoltaic panel (3), the detector body (6), and the battery (5) are electrically connected; the air supply mechanism (7) is used to deliver external air to the detection end (61) after it is filtered by the air filter mechanism (8). The air filter mechanism (8) has a local suction structure and a filter paper (89) that is replaced in cycles, so that the air entering the air supply mechanism (7) is kept at its original concentration without being diluted by the ambient air. The detection end (61) is used to detect the concentration of combustible gas in the undiluted air and to alarm the detector body (6) when the concentration exceeds the limit; the air supply mechanism (7) is equipped with a pressure sensor (79) to detect the airflow pressure in order to control the replacement of the filter paper (89) in the air filter mechanism (8).

2. A mobile combustible gas alarm detector according to claim 1, characterized in that: The air supply mechanism (7) includes a circular tube (71) fixedly sleeved on the detection end (61). A rectangular cover (72) is fixedly connected to the bottom end of the circular tube (71). A cross frame (73), a cone (75), and a retaining ring (76) are fixedly installed inside the circular tube (71). The cone (75) is located above the cross frame (73) and below the retaining ring (76). The detection end (61) abuts against the retaining ring (76). A fan (74) is fixedly installed on the cross frame (73). (71) Multiple air outlets (711) are arranged in a circular array on the inner wall. The multiple air outlets (711) are located between the retaining ring (76) and the cone (75). An annular box (77) is fixedly sleeved on the outside of the round tube (71). The inner side of the annular box (77) is open and connected to the multiple air outlets (711). An air outlet pipe (78) is installed through and fixedly installed on the annular box (77). The air pressure sensor (79) is installed through and fixedly installed on the air outlet pipe (78).

3. A mobile combustible gas alarm detector according to claim 2, characterized in that: The air filtration mechanism (8) includes a rectangular tube (81) fixedly installed at the bottom of a rectangular cover (72). Two horizontal plates (82) are fixedly installed inside the rectangular tube (81). A circular box (83) is rotatably installed between the two horizontal plates (82). A rectangular air inlet pipe (831) is fixedly installed through the circular box (83). A rectangular outlet (832) is opened on the circular box (83). A grid plate (812) is fixedly installed inside the rectangular tube (81). A rectangular transfer pipe (814) is slidably installed between the grid plate (812) and the circular box (83).

4. A mobile combustible gas alarm detector according to claim 3, characterized in that: An opening box one (84) and an opening box two (85) are fixedly installed on both sides of the rectangular tube (81). A winding roller (87) and an unwinding roller (86) are respectively installed in the opening box one (84) and the opening box two (85) with damping rotation. A rectangular opening one (813) is provided on the inner wall of both sides of the rectangular tube (81). The opening box one (84) and the opening box two (85) are respectively connected to the interior of the rectangular tube (81) through the corresponding rectangular opening one (813). The filter paper... (89) is wound on the unwinding roller (86) and the take-up roller (87). The two ends of the filter paper (89) are fixedly connected to the unwinding roller (86) and the take-up roller (87) respectively. The filter paper (89) passes through the rectangular tube (81) through two rectangular openings (813). A motor (88) is fixedly installed on the side of the opening box (84) near the column (2). The output shaft of the motor (88) rotates through the opening box (84) and is fixedly connected to the end of the take-up roller (87).

5. A mobile combustible gas alarm detector according to claim 4, characterized in that: The rectangular tube (81) is rotatably mounted with a licker roller (810) and a smooth roller (811). The filter paper (89) passes around the licker roller (810) and the smooth roller (811) and is located above the licker roller (810) and the smooth roller (811). An encoder (820) is fixedly mounted on the side of the rectangular tube (81) near the column (2). The end of the smooth roller (811) is fixedly connected to the input shaft of the encoder (820).

6. A mobile combustible gas alarm detector according to claim 5, characterized in that: The rectangular tube (81) has rectangular openings (825) on both sides of its inner wall. Rollers (824) are slidably installed in both rectangular openings (825). The two rollers (824) are rotatably connected to both sides of the rectangular transfer tube (814). A bellows plate (818) and a bellows plate (819) are fixedly installed on both sides of the rectangular transfer tube (814). The rollers (824) pass through the bellows plate (818) and are rotatably connected to the bellows plate (818). A baffle (815), a baffle (816), and a baffle (817) are fixedly installed on both sides of the inner wall of the rectangular tube (81). The rectangular transfer tube (814) is slidably installed between the baffle (815) and the baffle (816). The bellows plate (819) is slidably installed between the baffle (816) and the baffle (817).

7. A mobile combustible gas alarm detector according to claim 6, characterized in that: Both sides of the circular box (83) are fixedly installed with shafts. Both shafts pass through the rectangular tube (81) and are rotatably connected to it. Both shafts are fixedly installed with swing arms (823) at their ends. A frame (821) is fixedly installed on the side of the rectangular tube (81) near the column (2). A second motor (822) is fixedly installed on the frame (821). The output shaft of the second motor (822) is fixedly connected to the adjacent swing arm (823). A strip hole (8231) is opened on the swing arm (823). Two rollers (824) are respectively rotatably installed in the corresponding strip hole (8231).

8. A mobile combustible gas alarm detector according to claim 7, characterized in that: Baffles (826) are fixedly installed on both sides of the inner wall of the rectangular tube (81), and two swing arms (823) support filter paper (89) and fit against the bottom of the grid plate (812).

9. A mobile combustible gas alarm detector according to claim 2, characterized in that: The lower end face of the detection end (61) abuts against the upper end face of the retaining ring (76).

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