A hand-held liquid fuel combustible gas detection device

Abstract

This invention relates to a handheld liquid fuel combustible gas detection device, comprising a first air inlet pipe, a gas sensor pipe, and an air outlet pipe sequentially connected within a housing. The first air inlet pipe includes a pump inlet pipe, an air pump, and a pump outlet pipe sequentially connected. The air pump pumps air or liquid fuel combustible gas into the detection chamber through the pump inlet pipe and then pumps it out through the pump outlet pipe. After the current liquid fuel combustible gas detection is completed and before starting the next liquid fuel combustible gas detection, air is first pumped into the detection chamber through the first air inlet pipe to expel any residual current liquid fuel combustible gas, and then the next liquid fuel combustible gas is pumped into the detection chamber through the first air inlet pipe. At least one beneficial effect of this invention is that it provides a handheld liquid fuel combustible gas detection device that improves detection efficiency and accuracy.

Description

Technical Field

[0001] This invention belongs to the field of measuring the concentration of combustible gas in liquid fuels, and specifically relates to a handheld combustible gas detection device for liquid fuels. Background Technology

[0002] Combustible gases from liquid fuels refer to the flammable gases emitted from fuels such as aviation kerosene, gasoline, and diesel. Compared to online detection devices, portable detection devices are widely used because they can detect combustible gases from liquid fuels in confined spaces. Most current handheld combustible gas detectors for liquid fuels are designed to detect the combustible gas from a single liquid fuel, such as the portable aviation kerosene leak detector disclosed in CN218212618U. While a few handheld combustible gas detectors can detect the combustible gas from multiple liquid fuels, the accuracy of detecting the combustible gas concentration of the switched liquid fuel is poor, and a long waiting time is required before the switch can begin, resulting in low detection efficiency. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a handheld liquid fuel combustible gas detection device, comprising a first air inlet pipe, a gas sensor pipe, and an air outlet pipe sequentially connected within a housing. The first air inlet pipe includes a pump inlet pipe, an air pump, and a pump outlet pipe sequentially connected. The air pump pumps air or liquid fuel combustible gas into the detection chamber through the pump inlet pipe and then pumps it out through the pump outlet pipe. After completing the detection of the current liquid fuel combustible gas and before starting the next liquid fuel combustible gas detection, air is first pumped into the detection chamber through the first air inlet pipe to expel any residual current liquid fuel combustible gas, and then the next liquid fuel combustible gas is pumped into the detection chamber through the first air inlet pipe.

[0004] The gas sensor pipeline includes a detection chamber with a detection inlet and a detection outlet. The detection inlet is connected to the pump outlet pipe, and the detection outlet is connected to the outlet pipe. The gas sensor probe is placed inside the detection chamber.

[0005] A further handheld liquid fuel combustible gas detection device, wherein: the device further includes a second air inlet pipe connected to the gas sensor pipe, the liquid fuel combustible gas enters the gas sensor pipe through the second air inlet pipe, and the air enters the gas sensor pipe through the first air inlet pipe.

[0006] A further handheld liquid fuel combustible gas detection device, wherein: the device further includes a conversion pipeline connected to the second air inlet pipeline, the conversion pipeline including a liquid fuel tank with a fuel tank filling port, a compartment and a fuel tank outlet, the liquid fuel being added to the compartment from the fuel tank filling port, and after the liquid fuel combustible gas evaporates in the compartment, the liquid fuel combustible gas entering the second air inlet pipeline from the fuel tank outlet.

[0007] A further handheld liquid fuel combustible gas detection device, wherein: the liquid fuel tank further includes a porous flexible material and a fuel tank air inlet, the porous flexible material is used to adsorb the liquid fuel entering the tank, and the air entering from the fuel tank air inlet can accelerate the volatilization of the liquid fuel in the tank.

[0008] A further handheld liquid fuel combustible gas detection device, wherein: the device further includes a third air inlet pipe, the air inlet of the third air inlet pipe being connected to the first air inlet pipe, and the air outlet of the third air inlet pipe being connected to the fuel tank air inlet.

[0009] A further handheld liquid fuel combustible gas detection device, wherein: the device further includes a circulation pipeline, the air inlet of the circulation pipeline is connected to the air outlet pipeline, the air outlet of the circulation pipeline is connected to the pump inlet pipeline, and the circulation pipeline is used to increase the concentration of liquid fuel combustible gas in the detection chamber.

[0010] A further handheld liquid fuel combustible gas detection device, wherein: the liquid fuel tank includes a tank shell and a cover fixedly installed on the tank shell, the tank shell and the cover together form the chamber, the liquid fuel tank, the second air inlet pipe and the third air inlet pipe are detachably installed in a carrier box, the carrier box is formed on the upper shell of the tank shell;

[0011] The fuel tank filling port is formed on the hull, and a plurality of support pillars are arranged around the inner side wall of the hull. The porous flexible material is fixedly installed on the support pillars, and a volatile gas channel is formed between the porous flexible material and the hull. The fuel tank air inlet is formed on the hull and communicates with the volatile gas channel, and the fuel tank air outlet is formed on the hull cover and communicates with the volatile gas channel.

[0012] A further handheld liquid fuel combustible gas detection device, wherein: the liquid fuel tank includes a tank shell and a cover fixedly installed on the tank shell, the tank shell and the cover together form the compartment, the tank shell is formed between the upper shell and the lower shell of the tank shell, and the cover is detachably installed on the upper shell;

[0013] The fuel tank filling port is formed on the hatch cover. The porous flexible material is fixedly installed on the bracket. The bottom end of the bracket is snapped into the hatch shell. The top end of the bracket is detachably connected to the hatch cover. A volatile gas passage is formed between the porous flexible material and the hatch. The fuel tank air inlet is formed on one side of the hatch shell and communicates with the volatile gas passage. The fuel tank air outlet is formed on the other side of the hatch shell and communicates with the volatile gas passage.

[0014] A further handheld liquid fuel combustible gas detection device, wherein: the top of the porous flexible material is formed with a liquid suction platform opposite to the fuel tank filling port, and the surface of the porous flexible material is formed with a liquid guiding groove;

[0015] A spoiler is fixedly installed inside the hull, and the spoiler corresponds to the air inlet of the fuel tank. A guide vane is fixedly installed inside the hull, and the guide vane corresponds to the air outlet of the fuel tank.

[0016] A further handheld liquid fuel combustible gas detection device, wherein: flame arresters are installed on the pump inlet pipe, the second air inlet pipe, and the air outlet pipe;

[0017] The air inlet of the pump inlet pipe is an explosion-proof air inlet, and the air outlet of the air outlet pipe is connected to a connector.

[0018] At least one beneficial effect of the present invention is that the handheld liquid fuel combustible gas detection device provided by the present invention can improve the accuracy of combustible gas concentration detection of liquid fuel after switching, thereby making the accuracy of combustible gas concentration detection of liquid fuel before and after switching consistent, and can perform combustible gas concentration detection of liquid fuel after switching without long waiting time, thereby improving detection efficiency. That is, the present invention provides a handheld liquid fuel combustible gas detection device that improves detection efficiency and accuracy. Attached Figure Description

[0019] Figure 1 This is a schematic diagram showing the connection of the first air inlet pipe, the gas sensor pipe, and the air outlet pipe of the present invention.

[0020] Figure 2 This is a schematic diagram of the second air intake pipe connection of the present invention.

[0021] Figure 3 This is a schematic diagram of the conversion pipeline connection of the present invention.

[0022] Figure 4 This is a schematic diagram showing the connection of the second intake pipe, the switching pipe, and the third intake pipe of the present invention.

[0023] Figure 5 This is a schematic diagram showing the connection of the first air intake pipe, the conversion pipe, and the gas sensor pipe of the present invention.

[0024] Figure 6 This is a schematic diagram of the circulation pipeline connection of the present invention.

[0025] Figure 7 This is a schematic diagram of the circulation pipeline connection in some embodiments of the present invention.

[0026] Figure 8 This is a schematic diagram of the circulation pipeline connection in some embodiments of the present invention.

[0027] Figure 9 This is a frontal axonometric structural diagram of a liquid fuel tank in some embodiments of the present invention.

[0028] Figure 10 For the present invention Figure 9 Schematic diagram of the front view section structure.

[0029] Figure 11 For the present invention Figure 9 Schematic diagram of the cross-section structure from the middle right view.

[0030] Figure 12 For the present invention Figure 9 Schematic diagram of the middle carrier box structure.

[0031] Figure 13 This is a frontal axonometric structural diagram of a liquid fuel tank in some embodiments of the present invention.

[0032] Figure 14 For the present invention Figure 13 Schematic diagram of the front view section structure.

[0033] Figure 15 For the present invention Figure 13 Schematic diagram of the cross-section structure from the middle right view.

[0034] Figure 16 For the present invention Figure 13 Schematic diagram of the cut structure from a top-down view (center right).

[0035] Figure 17 For the present invention Figure 13 Schematic diagram of the support structure.

[0036] Figure 18 This is a schematic diagram of the circuit connection of the present invention.

[0037] Figure 19 This is a schematic diagram of the device structure in some embodiments of the present invention.

[0038] Figure 20 This is a schematic diagram of the device structure in some embodiments of the present invention.

[0039] Explanation of the labels in the diagram:

[0040] 1. First intake pipe; 2. Gas sensor pipe; 3. Exhaust pipe; 4. Pump inlet pipe; 5. Air pump; 6. Pump outlet pipe; 7. Detection inlet; 8. Detection outlet; 9. Detection chamber; 10. Gas sensor probe; 11. Second intake pipe; 12. Conversion pipe; 13. Fuel tank filler port; 14. Compartment; 15. Fuel tank outlet; 16. Liquid fuel tank; 17. Porous flexible material; 18. Fuel tank inlet; 19. Third intake pipe; 20. Circulation system Piping; 21. Hull; 22. Hull cover; 23. Carrier box; 24. Upper shell; 25. Support column; 26. Volatile gas duct; 27. Lower shell; 28. Support frame; 29. ​​Liquid suction platform; 30. Liquid guide channel; 31. Baffle plate; 32. Guide plate; 33. Flame arrester; 34. Connector; 35. Shell; 36. Three-way valve; 37. Liquid injection channel; 38. Battery; 39. TYPE-C charging port; 40. Wireless charging module; 41. Main board; 42. Display screen; 43. Control panel. Detailed Implementation

[0041] The relevant terms in the embodiments of this invention are explained as follows:

[0042] "Gas sensors" include semiconductor gas sensors, solid electrolyte gas sensors, contact combustion gas sensors, electrochemical gas sensors, infrared absorption gas sensors, quartz oscillating gas sensors, thermally conductive gas sensors, fiber optic gas sensors, and heterojunction gas sensors. Semiconductor gas sensors include resistive semiconductor gas sensors and non-resistive semiconductor gas sensors. The gas sensors described above in this invention are preferably microstructure gas sensors (also known as MEMS gas sensors) fabricated using MEMS technology. Microstructure gas sensors include silicon-based microstructure gas sensors and silicon microstructure gas sensors.

[0043] The "probe" is the front-end component of a gas sensor that comes into direct contact with the gas. It includes sensitive materials, electrodes, heaters (optional), and protective structures. Its core function is to convert gas concentration into an electrical signal. Depending on the type of gas sensor, the "probe" can also be the sensitive element itself, such as a SnO2 thin film on a MEMS chip.

[0044] The "lower explosive limit (LEL)" is the lowest explosive concentration of a combustible gas or vapor in air. For example, in this invention, a detected concentration of 25% LEL can be set as the threshold for a Level 1 warning, as can a detected concentration of 50% LEL. The detection is completed quickly by displaying the detected concentration value in real time and using the preset threshold. Based on this, operators can also issue warnings based on the detected concentration value, and further connect to alarm devices to issue warnings based on set alarm thresholds.

[0045] The handheld liquid fuel combustible gas detection device of the present invention will be further described below through specific embodiments.

[0046] like Figure 1-20 As shown, some embodiments of the present invention relate to a handheld liquid fuel combustible gas detection device, including a first air inlet pipe 1, a gas sensor pipe 2, and an air outlet pipe 3 connected in sequence within a housing 35. The first air inlet pipe 1 includes a pump inlet pipe 4, an air pump 5, and a pump outlet pipe 6 connected in sequence. The air pump 5 pumps air or liquid fuel combustible gas into the detection chamber 9 through the pump inlet pipe 4 and then pumps it out through the pump outlet pipe 6. After the current liquid fuel combustible gas detection is completed and before the next liquid fuel combustible gas detection begins, air is first pumped into the detection chamber 9 through the first air inlet pipe 1 to expel any residual current liquid fuel combustible gas, and then the next liquid fuel combustible gas is pumped into the detection chamber 9 through the first air inlet pipe 1.

[0047] The gas sensor pipeline 2 includes a detection chamber 9 with a detection inlet 7 and a detection outlet 8. The detection inlet 7 is connected to the pump outlet pipe 6, and the detection outlet 8 is connected to the outlet pipeline 3. The gas sensor probe 10 is placed inside the detection chamber 9.

[0048] In these implementations, such as Figure 1 As shown, the air pump 5 delivers air or liquid fuel combustible gas through the pump inlet pipe 4 to the pump outlet pipe 6, and then into the detection chamber 9 of the gas sensor pipe 2 for concentration detection. Subsequently, the air or liquid fuel combustible gas is discharged through the outlet pipe 3. After completing the detection of the current liquid fuel combustible gas, the air pump 5 continuously supplies air to vent any remaining liquid fuel combustible gas from the first inlet pipe 1, the gas sensor pipe 2, and the outlet pipe 3, restoring the internal piping of the device to its initial state. Then, the next liquid fuel combustible gas concentration detection is performed. By venting the piping, the accuracy of liquid fuel combustible gas concentration detection after switching can be improved, ensuring consistent detection accuracy before and after switching. Furthermore, the detection of liquid fuel combustible gas concentration after switching can be performed without a long waiting period, thus improving detection efficiency and effectively enhancing the detection efficiency and accuracy of this invention.

[0049] In the detection of switching between liquid fuel combustible gases, the current liquid fuel combustible gas and the next liquid fuel combustible gas can be the same gas or different gases. For example, in multi-point detection within a region, even if the gas being detected is the same, initializing the pipeline by purging it can effectively reduce residual gas inside the pipeline, preventing gas accumulation and ensuring the accuracy of detection at different points. Similarly, in the detection of different gases, initializing the pipeline by purging it can effectively avoid the influence of different gases on the gas to be detected, thus ensuring the accuracy of the detection. Furthermore, proactive purging avoids long waiting times, which helps improve detection efficiency. Additionally, Figure 1 Solid arrows indicate the direction of airflow, while dashed arrows indicate the direction of flow of liquid fuels and combustible gases. The solid and dashed arrows in the other attached diagrams also represent the above indications, so they will not be repeated here.

[0050] In some embodiments of a handheld liquid fuel combustible gas detection device, the device further includes a second air inlet pipe 11 connected to the gas sensor pipe 2. The liquid fuel combustible gas enters the gas sensor pipe 2 through the second air inlet pipe 11, and air enters the gas sensor pipe 2 through the first air inlet pipe 1.

[0051] In these implementations, such as Figure 2 As shown, the outlet of the second intake pipe 11 is connected to the pump outlet pipe 6 in the first intake pipe 1 via a three-way valve 36. By supplying air to the gas sensor pipe 2 through the first intake pipe 1 and by supplying liquid fuel combustible gas to the gas sensor pipe 2 through the second intake pipe 11, the detection of the two gases can be performed independently, further improving the accuracy of detection. Furthermore, the first intake pipe 1 can supply the current liquid fuel combustible gas, and the second intake pipe 11 can supply the next liquid fuel combustible gas, allowing for independent detection of the two gases, which also effectively improves the accuracy of liquid fuel combustible gas detection. In addition, both the first intake pipe 1 and the second intake pipe 11 can be emptied through a purging initialization process, thereby ensuring detection accuracy while improving detection efficiency. In addition, the second air intake pipe 11 can be used to transport gas by means of an air pump 5. For example, another first air intake pipe 1 can be connected to the second air intake pipe 11 to achieve active gas transport. Alternatively, the inlet of the second air intake pipe 11 can be set outside the housing 35, and air can be transported by external equipment or by natural air flow into the second air intake pipe 11. The present invention does not specifically limit the way the second air intake pipe 11 transports gas.

[0052] In some embodiments of a handheld liquid fuel combustible gas detection device, the device further includes a conversion pipe 12 connected to the second air inlet pipe 11. The conversion pipe 12 includes a liquid fuel tank 16 with a fuel tank filling port 13, a chamber 14, and a fuel tank outlet 15. Liquid fuel is added to the chamber 14 from the fuel tank filling port 13. After the liquid fuel combustible gas evaporates in the chamber 14, the liquid fuel combustible gas enters the second air inlet pipe 11 from the fuel tank outlet 15.

[0053] In these implementations, such as Figure 3 As shown, the intake port of the second intake pipe 11 is connected to the conversion pipe 12. The combustible gas of liquid fuel generated in the conversion pipe 12 is transported to the gas sensor pipe 2 through the second intake pipe 11 for detection, further realizing the detection of simulated combustible gas of liquid fuel. By actively adding liquid fuel to generate combustible gas for detection, it can better meet the detection needs in different scenarios and effectively improve the flexibility of use. Among them, the fuel tank filling port 13 is connected to the outside through the liquid injection channel 37 inside the shell 35. Figure 3 (Not shown in the diagram) Liquid fuel enters the liquid fuel tank 16 through the fuel tank filling port 13, and evaporates into combustible liquid fuel gas in the chamber 14. The gas then enters the second air intake pipe 11 through the fuel tank outlet 15, ensuring that the evaporated combustible liquid fuel gas can smoothly enter the second air intake pipe 11. Air entering the chamber 14 can be supplied by the air pump 5 (same principle as described above), or by natural air intake. Liquid fuel can be added in multiple stages, and the amount added each time can be flexibly selected according to the detection requirements of different gases; no specific limitation is made in this invention.

[0054] By simulating the detection of combustible gases from liquid fuels, this invention not only detects the simulated gas but also discharges it through the outlet pipe 3. The discharged gas can then be further used to detect combustible gas concentration alarms. For example, during the storage and transportation of liquid fuels, combustible gas concentration alarms are typically installed at multiple locations, and these alarms need to be periodically checked for proper operation. This invention simulates the combustible gas (e.g., 50% LEL concentration) from the stored and transported liquid fuels through the conversion pipe 12. After detection by the gas sensor pipe 2, the gas is input to the combustible gas concentration alarm through the outlet pipe 3 to observe whether an alarm sounds, thereby checking the normal operation of the alarm. This effectively improves the detection efficiency of combustible gas concentration alarms distributed at various locations. Through this simulated detection method, not only can the detection of combustible gases from liquid fuels be actively completed, but the detection of combustible gas concentration alarms can also be completed by actively simulating the combustible gas from liquid fuels. This greatly improves the flexibility of use and better meets the detection needs of different scenarios in the detection of combustible gases from liquid fuels.

[0055] In some embodiments of a handheld liquid fuel combustible gas detection device, the liquid fuel tank 16 further includes a porous flexible material 17 and a fuel tank air inlet 18. The porous flexible material 17 is used to adsorb the liquid fuel entering the chamber 14, and the air entering from the fuel tank air inlet 18 can accelerate the volatilization of the liquid fuel in the chamber 14.

[0056] In these implementations, such as Figure 3-4 As shown, the porous flexible material 17 can be felt, including coarse-porous felt with high porosity and fine-porous felt with low porosity. When adding liquid fuel, the coarse-porous felt first contacts the liquid fuel, quickly absorbs the fuel, and then transfers it to the fine-porous felt, controlling the fuel release rate and ensuring uniform evaporation. Gas is supplied to the compartment 14 through the fuel tank air inlet 18, and the gas flow accelerates the evaporation of the liquid fuel in the compartment 14. This not only ensures uniform evaporation of the liquid fuel but also ensures a balanced concentration of combustible gas from the liquid fuel discharged from the compartment 14, thereby improving the accuracy of detection.

[0057] In some embodiments of a handheld liquid fuel combustible gas detection device, the device further includes a third air inlet pipe 19, the air inlet of the third air inlet pipe 19 being connected to the first air inlet pipe 1, and the air outlet of the third air inlet pipe 19 being connected to the fuel tank air inlet 18.

[0058] In these implementations, such as Figure 2-5 As shown, the air inlet of the third air inlet pipe 19 is connected to the first air inlet pipe 1 via a three-way valve 36, allowing the air pump 5 to supply gas not only to the pump outlet pipe 6 but also to the switching pipe 12, making operation more convenient and efficient. Furthermore, the three-way valve 36 described in this invention can be an electrically controlled three-way valve, a manual three-way valve (whose control end extends out of the housing 35), etc. No specific limitation is made in this invention. The mechanical structure and working principle of electrically controlled three-way valves and manual three-way valves are existing technologies and will not be described in detail herein.

[0059] In some embodiments of a handheld liquid fuel combustible gas detection device, the device further includes a circulation pipeline 20, the inlet of which is connected to the outlet pipeline 3, and the outlet of which is connected to the pump inlet pipeline 4. The circulation pipeline 20 is used to increase the concentration of liquid fuel combustible gas in the detection chamber 9.

[0060] In these implementations, such as Figure 6-8As shown, the air inlet of the circulation pipeline 20 is connected to the air outlet pipeline 3 via a three-way valve 36, and the air outlet of the circulation pipeline 20 is connected to the pump inlet pipeline 4 via a three-way valve 36. The liquid fuel combustible gas circulates throughout the entire pipeline system via the circulation pipeline 20, allowing the concentration of the liquid fuel combustible gas in the detection chamber 9 to gradually increase, thereby meeting the needs of different concentration detection requirements. In particular, it can increase the simulated detection concentration of the liquid fuel combustible gas according to requirements, further improving the flexibility of use. It should be understood that, in order to adapt to the circulation of liquid fuel combustible gas, all pipelines in this invention can use adaptable pipes, such as those that meet circulation requirements in terms of material and pipe diameter. Appropriate selection can be made based on safety, material, and connection devices. Different pipelines can also be used according to different pipeline safety levels. No specific limitations are made in the selection of each pipeline in this invention.

[0061] To further increase the rate at which the concentration of combustible gases in liquid fuels is increased, such as Figure 7 As shown, the circulation pipe 20 is an S-shaped bend pipe. The S-shaped bend reduces the gas flow rate, thereby increasing the concentration of combustible gas in the liquid fuel. To further improve the safety of the circulation pipe 20, such as... Figure 8 As shown, the air inlet of the circulation pipeline 20 is connected to the pump outlet pipe 6 via a three-way valve 36, and the air outlet of the circulation pipeline 20 is also connected to the pump outlet pipe 6 via a three-way valve 36. During circulation, the liquid fuel combustible gas enters the circulation pipeline 20 from the pump outlet pipe 6 and then enters the gas sensor pipeline 2. This pipeline can also be an S-shaped bend pipe, thereby achieving an increase in concentration within the pipeline, which is beneficial to improving the safety of use. The configuration of the circulation pipeline 20 in this invention includes, but is not limited to, the above-mentioned types, as long as it can increase the concentration of the liquid fuel combustible gas entering the gas sensor pipeline 2. For example, the second air inlet pipe 11 can also be set as an S-shaped bend pipe (not shown in the figure) or the pipe diameter can be increased to increase the concentration of the liquid fuel combustible gas entering the gas sensor pipeline 2. The specific design of the circulation pipeline 20 is not limited in this invention.

[0062] In some embodiments of a handheld liquid fuel combustible gas detection device, the liquid fuel tank 16 includes a tank shell 21 and a cover 22 fixedly installed on the tank shell 21. The tank shell 21 and the cover 22 together form a chamber 14. The liquid fuel tank 16, the second air inlet pipe 11, and the third air inlet pipe 19 are detachably installed in the carrier box 23. The carrier box 23 is formed on the upper shell 24 of the housing 35.

[0063] A fuel tank filling port 13 is formed on the hull 21. Several support columns 25 are arranged around the inner side wall of the hull 21. A porous flexible material 17 is fixedly installed on the support columns 25. An evaporation channel 26 is formed between the porous flexible material 17 and the compartment 14. A fuel tank air inlet 18 is formed on the hull 21 and communicates with the evaporation channel 26. A fuel tank air outlet 15 is formed on the hatch cover 22 and communicates with the evaporation channel 26.

[0064] In these implementations, such as Figure 9-12 As shown, the hatch cover 22 is threadedly connected to the tank shell 21, forming a compartment 14 after the two are joined. This allows for the replacement of the porous flexible material 17 within the compartment 14 when needed. The porous flexible material 17 is stably fixed within the compartment 14 by support pillars 25. The porous flexible material 17 is located at the center of the compartment 14, leaving a vapor vent 26 between the porous flexible material 17 and the side wall of the compartment 14, ensuring stable gas flow through the compartment 14. The fuel tank inlet 18 and fuel tank outlet 15 are correspondingly arranged to ensure that the gas entering through the fuel tank inlet 18 comes into full contact with the porous flexible material 17 and is stably discharged through the fuel tank outlet 15, thereby ensuring efficient vaporization of the liquid fuel within the porous flexible material 17.

[0065] The fuel tank air inlet 18 is connected to the third air intake pipe 19. The air inlet of the third air intake pipe 19 is threaded onto one of the air outlets of the three-way valve 36. A locking head is movably installed at the air inlet of the third air intake pipe 19, allowing relative rotation between the locking head and the air inlet. Rotating the locking head on the three-way valve 36 simultaneously engages the third air intake pipe 19 with the three-way valve 36. During installation, the locking head is tightened onto the three-way valve 36, completing the connection between the third air intake pipe 19 and the three-way valve 36. This not only ensures the safety of the pipe connection but also… To facilitate the installation and removal of the third air intake pipe 19, similarly, the outlet of the second air intake pipe 11 is threadedly installed with the inlet of the three-way valve 36. The outlet of the second air intake pipe 11 is also movably equipped with a locking head, which allows for quick installation and removal. Optionally, both the second air intake pipe 11 and the third air intake pipe 19 can be fixedly installed on the liquid fuel tank 16, thereby facilitating the installation and removal of the liquid fuel tank 16, the second air intake pipe 11, and the third air intake pipe 19 within the carrier box 23, so as to flexibly replace the liquid fuel tank 16 according to usage requirements.

[0066] like Figure 12 As shown, the carrier box 23 is formed on the upper shell 24 of the housing 35, and the housing 35 is composed of the upper shell 24 and the lower shell 27. Figure 12(Not shown in the figure) The carrier box 23 is equipped with a box cover (not shown in the figure). One side of the box cover is hinged to the upper surface of the housing 35, and the other side forms a latch that can be locked to the upper housing 24. After opening the box cover, the liquid fuel tank 16 is exposed, and then loading, unloading and replacement can be carried out. Furthermore, a liquid injection channel 37 (not shown in the figure) is formed between the fuel tank filling port 13 and the box cover. For example, a liquid injection pipe is formed on the box cover, which is connected to the fuel tank filling port 13. Liquid fuel is injected into the fuel tank filling port 13 through the liquid injection pipe. The inside of the fuel tank filling port 13 is formed with a rubber sealing plug. When injecting with a syringe, the needle is passed through the rubber sealing plug for injection, which can ensure the sealing of the liquid fuel tank 16 and facilitate the injection of liquid fuel at any time. It is simple and convenient to use. Additionally, the end of the fuel tank filling port 13 can extend beyond the cover, allowing for convenient filling by simply passing the needle through the rubber sealing plug. Alternatively, the rubber sealing plug can be replaced with a threaded plunger installed on the fuel tank filling port 13. Unscrewing the plunger opens the fuel tank filling port 13, allowing liquid fuel to be injected. This avoids the need for a needle and allows for direct filling using a syringe tube. The method of filling liquid fuel is not specifically limited in this invention. It should be understood that the replacement of the liquid fuel tank 16 in this invention is irregular and requires professional operation. The replacement cycle is determined based on testing needs and the usage status of the porous flexible material 17. In other words, the liquid fuel tank 16 is not frequently replaced during normal use, but rather replaced when "maintenance" is required.

[0067] In order to improve the efficiency and effect of liquid fuel volatilization, unlike the aforementioned embodiments, in some embodiments of a handheld liquid fuel combustible gas detection device, the liquid fuel tank 16 includes a tank shell 21 and a tank cover 22 fixedly installed on the tank shell 21. The tank shell 21 and the tank cover 22 together form a chamber 14. The tank shell 21 is formed between the upper shell 24 and the lower shell 27 of the shell 35. The tank cover 22 is detachably installed on the upper shell 24.

[0068] A fuel tank filling port 13 is formed on the hatch cover 22. A porous flexible material 17 is fixedly installed on a bracket 28. The bottom end of the bracket 28 is snapped into the tank shell 21. The top end of the bracket 28 is detachably connected to the hatch cover 22. An evaporation duct 26 is formed between the porous flexible material 17 and the compartment 14. A fuel tank air inlet 18 is formed on one side of the tank shell 21 and communicates with the evaporation duct 26. A fuel tank air outlet 15 is formed on the other side of the tank shell 21 and communicates with the evaporation duct 26.

[0069] In these implementations, such as Figure 13-17 As shown, the hatch 21 is formed within the shell 35, located between the upper shell 24 and the lower shell 27. The hatch cover 22 is detachably mounted on the upper shell 24 by screws, as shown. Figure 14-15 As shown, the hatch 22 is secured to the upper shell 24 by a number of screws around its perimeter. Figure 14-17 As shown, the porous flexible material 17 is prismatic in shape and has hollow through-holes. The prismatic porous flexible material 17 is detachably installed in the compartment 14 via the bracket 28, making loading and unloading the porous flexible material 17 simpler and more convenient. Furthermore, the fuel tank filling port 13 on the hatch cover 22 is located directly above the porous flexible material 17, allowing the added liquid fuel to make more thorough contact with the porous flexible material 17, ensuring effective liquid absorption. The specific mechanical structure and working principle of the fuel tank filling port 13 are the same as in the aforementioned embodiments, and therefore will not be repeated. The prismatic porous flexible material 17 allows the liquid fuel to combine more tightly with the air circulating in the compartment 14, effectively improving the efficiency and effect of evaporation. It should be understood that, through the cooperation of the hatch cover 22 and the tank shell 21, only the porous flexible material 17 needs to be replaced, but the replacement principle is the same as the replacement principle of the liquid fuel tank 16 in the aforementioned embodiments, and is not specifically limited in this invention.

[0070] In some embodiments of a handheld liquid fuel combustible gas detection device, a liquid suction platform 29 is formed at the top of the porous flexible material 17, which is opposite to the fuel tank filling port 13, and a liquid guiding groove 30 is formed on the surface of the porous flexible material 17.

[0071] A spoiler 31 is fixedly installed inside the hull 21, which corresponds to the fuel tank air inlet 18. A guide vane 32 is fixedly installed inside the hull 21, which corresponds to the fuel tank air outlet 15.

[0072] In these implementations, such as Figure 13-17 As shown, the combination of the suction platform 29 and the liquid guiding channel 30 not only ensures rapid absorption of the added liquid fuel but also improves diffusion efficiency, ensuring that the liquid fuel is evenly distributed in the porous flexible material 17, thereby improving the volatilization effect. Several baffles 31 are symmetrically distributed at the fuel tank inlet 18. The baffles 31 effectively reduce the flow velocity of gas entering the chamber 14, allowing for more thorough contact between the gas and the porous flexible material 17. Combined with the guide plate 32 located at the fuel tank outlet 15, this further enhances the contact between the gas in the chamber 14 and the porous flexible material 17, thereby improving the volatilization efficiency and effect of the liquid fuel and ensuring the accuracy of the detection.

[0073] In some embodiments of a handheld liquid fuel combustible gas detection device, flame arresters 33 are installed on the pump inlet pipe 4, the second air inlet pipe 11, and the air outlet pipe 3.

[0074] The air inlet of the pump inlet pipe 4 is an explosion-proof air inlet, and the air outlet of the outlet pipe 3 is connected to a connector 34.

[0075] In these implementations, such as Figure 1-8As shown, the flame arrester 33 ensures the safety of the pipeline system and filters the gas flowing through the pipeline, preventing the accumulation of impurities and liquids and ensuring accurate operation. The explosion-proof air inlet ensures the safety of air intake through the pump pipe 4 and also allows for connection to conduits, improving operational flexibility. The connector 34 ensures stable gas discharge and allows for connection to external conduits as needed (e.g., during simulation testing), making it convenient and efficient to use.

[0076] In some embodiments of a handheld liquid fuel combustible gas detection device, the handheld liquid fuel combustible gas detection device includes a battery 38, which is charged through a TYPE-C charging port 39 or a wireless charging module 40 and supplies power to a motherboard 41. The motherboard 41 is electrically connected to a display screen 42, an air pump 5, a gas sensor probe 10, and an operation panel 43.

[0077] In these implementations, such as Figure 18 The simplified circuit connection diagram of the present invention is shown. The explosion-proof housing 35 charges the battery 38 via a TYPE-C charging port 39 or a wireless charging module 40, and the battery 38 supplies power to the mainboard 41. Additionally, when the three-way valve 36 is an electric three-way valve, it can also be electrically connected to the mainboard 41.

[0078] Furthermore, in some embodiments of a handheld liquid fuel combustible gas detection device, such as Figure 19 The diagram shows one type of device. During simulation testing, the main board 41 drives the air pump 5 to deliver air to the liquid fuel tank 16 to mix with the liquid fuel, creating a gas mixture. The mixture enters the detection chamber 9 through the second air inlet pipe 11, is detected by the gas sensor probe 10, and then the real-time concentration value of the mixture is displayed on the screen 42. The explosion-proof air inlet of the pump pipe 4 above the explosion-proof housing 35 and the connector 34 of the outlet pipe 3 can both be connected to a gas guide pipe. The gas mixture is ejected from inside the device through the pipe and out of the outlet pipe 3 at the top of the device, achieving the purpose of simulation testing, that is, realizing the detection of combustible gas concentration alarms at multiple points.

[0079] In some embodiments of a handheld liquid fuel combustible gas detection device, such as Figure 20 The schematic diagram of one of the devices shown is based on the same principle as described above. When performing active detection, air or liquid fuel combustible gas is drawn in by the air pump 5, and then transported to the detection chamber 9 through the pump outlet pipe 6 for detection and display on the display screen 42.

[0080] These implementations, through the flexible use of active and simulated detection, improve the detection level of combustible gas concentration alarms, ensure the safety of liquid fuel production and storage areas, reduce accidents caused by combustible gas leaks, protect people's lives and property, and contribute to social stability.

[0081] Some handheld liquid fuel combustible gas detection devices can be used in direct detection mode, sample gas detection mode, and simulation detection mode. For example, in direct detection mode, when detecting liquid fuel combustible gas, the handheld liquid fuel combustible gas detection device is placed in the small space to be tested where the liquid fuel is located. The liquid fuel combustible gas in the small space serves as a signal gas and enters the gas sensor pipe 2 through the first inlet pipe 1 to detect the liquid fuel combustible gas in the small space to be tested where the liquid fuel is located.

[0082] When switching between testing different liquid fuel combustible gases for the next liquid fuel combustible gas test, place the handheld liquid fuel combustible gas detector in the space where the liquid fuel is not located. Air enters the handheld liquid fuel combustible gas detector through the first air inlet pipe 1, completely expelling any residual combustible gas from the previous liquid fuel from the device. Then, place the device in the confined space containing the other liquid fuel to perform the liquid fuel combustible gas test.

[0083] For example, in the sample gas detection mode: when detecting combustible gas from liquid fuel, liquid fuel is drawn up with a sampling syringe and injected into the conversion pipeline 12 through the injection channel 37. The combustible gas from liquid fuel generated by the conversion pipeline 12 is used as a signal gas and enters the gas sensor pipeline 2 through the third inlet pipeline 19 to detect the combustible gas from liquid fuel in the current liquid fuel sample.

[0084] When switching between different liquid fuel combustible gases for the next liquid fuel combustible gas test (switching test), air is introduced into the handheld liquid fuel combustible gas detector through the first air inlet pipe 1 to completely expel any remaining gas from the previous liquid fuel combustible gas from the device. Then, a sampling syringe is used to draw up the other liquid fuel (using the porous flexible material 17) for the switchover liquid fuel combustible gas test.

[0085] Based on the sample gas detection mode, a simulation detection mode can also be performed: the gas outlet pipe 3 is connected to the combustible gas concentration alarm, the sample gas is discharged from the gas outlet pipe 3, and then the sample gas is delivered to the combustible gas concentration alarm to test whether the combustible gas concentration alarm is operating normally. The display screen 42 can display the real-time concentration of the sprayed mixed gas, which can be compared with the concentration displayed by the combustible gas concentration alarm to achieve the purpose of calibration. This allows the detection device to not only have alarm function testing but also calibration, thus improving the detection function.

[0086] The above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A handheld liquid fuel combustible gas detection device, comprising a first air inlet pipe (1), a gas sensor pipe (2), and an air outlet pipe (3) sequentially connected within a housing (35), characterized in that: The first air intake pipe (1) includes a pump inlet pipe (4), an air pump (5) and a pump outlet pipe (6) connected in sequence. The air pump (5) pumps air or liquid fuel combustible gas into the detection chamber (9) through the pump inlet pipe (4) and then pumps it out through the pump outlet pipe (6). After the current liquid fuel combustible gas detection is completed, before the next liquid fuel combustible gas detection begins, air is first pumped into the detection chamber (9) through the first air intake pipe (1) to expel the residual current liquid fuel combustible gas, and then the next liquid fuel combustible gas is pumped into the detection chamber (9) through the first air intake pipe (1). The gas sensor pipeline (2) includes a detection chamber (9) with a detection inlet (7) and a detection outlet (8). The detection inlet (7) is connected to the pump outlet pipe (6), and the detection outlet (8) is connected to the outlet pipeline (3). The gas sensor probe (10) is placed inside the detection chamber (9). The device further includes a second air inlet pipe (11) connected to the gas sensor pipe (2), wherein the liquid fuel combustible gas enters the gas sensor pipe (2) through the second air inlet pipe (11), and the air enters the gas sensor pipe (2) through the first air inlet pipe (1). The device also includes a switching pipe (12) connected to the second air intake pipe (11). The switching pipe (12) includes a liquid fuel tank (16) with a fuel tank filling port (13), a compartment (14) and a fuel tank outlet (15). The liquid fuel is added to the compartment (14) from the fuel tank filling port (13). After the liquid fuel combustible gas evaporates in the compartment (14), the liquid fuel combustible gas enters the second air intake pipe (11) from the fuel tank outlet (15). The liquid fuel tank (16) also includes a porous flexible material (17) and a fuel tank air inlet (18). The porous flexible material (17) is used to adsorb the liquid fuel entering the compartment (14), and the air entering from the fuel tank air inlet (18) can accelerate the volatilization of the liquid fuel in the compartment (14). The device also includes a third air intake pipe (19), the air inlet of the third air intake pipe (19) is connected to the first air intake pipe (1), and the air outlet of the third air intake pipe (19) is connected to the fuel tank air inlet (18). The device also includes a circulation pipeline (20), the air inlet of which is connected to the air outlet pipeline (3), and the air outlet of which is connected to the pump inlet pipeline (4). The circulation pipeline (20) is used to increase the concentration of liquid fuel combustible gas in the detection chamber (9).

2. The apparatus as described in claim 1, characterized in that: The liquid fuel tank (16) includes a tank shell (21) and a hatch cover (22) fixedly installed on the tank shell (21). The tank shell (21) and the hatch cover (22) together form the compartment (14). The liquid fuel tank (16), the second air intake pipe (11), and the third air intake pipe (19) are detachably installed in the carrier box (23). The carrier box (23) is formed on the upper shell (24) of the shell (35). The fuel tank filling port (13) is formed on the hull (21). Several support pillars (25) are arranged around the inner wall of the hull (21). The porous flexible material (17) is fixedly installed on the support pillars (25). A volatile gas passage (26) is formed between the porous flexible material (17) and the compartment (14). The fuel tank air inlet (18) is formed on the hull (21) and communicates with the volatile gas passage (26). The fuel tank air outlet (15) is formed on the hatch cover (22) and communicates with the volatile gas passage (26).

3. The apparatus as described in claim 1, characterized in that: The liquid fuel tank (16) includes a tank shell (21) and a hatch cover (22) fixedly installed on the tank shell (21). The tank shell (21) and the hatch cover (22) together form the compartment (14). The tank shell (21) is formed between the upper shell (24) and the lower shell (27) of the shell (35). The hatch cover (22) is detachably installed on the upper shell (24). The fuel tank filling port (13) is formed on the hatch cover (22). The porous flexible material (17) is fixedly installed on the bracket (28). The bottom end of the bracket (28) is snapped into the hatch shell (21). The top end of the bracket (28) is detachably connected to the hatch cover (22). A volatile gas passage (26) is formed between the porous flexible material (17) and the compartment (14). The fuel tank air inlet (18) is formed on one side of the hatch shell (21) and communicates with the volatile gas passage (26). The fuel tank air outlet (15) is formed on the other side of the hatch shell (21) and communicates with the volatile gas passage (26).

4. The apparatus as described in claim 3, characterized in that: The top of the porous flexible material (17) has a liquid suction platform (29) opposite to the fuel tank filling port (13), and the surface of the porous flexible material (17) has a liquid guiding groove (30). A spoiler (31) is fixedly installed inside the hull (21), the spoiler (31) is opposite to the fuel tank air inlet (18), and a guide plate (32) is fixedly installed inside the hull (21), the guide plate (32) is opposite to the fuel tank air outlet (15).

5. The apparatus as claimed in claim 1, characterized in that: Flame arresters (33) are installed on the pump inlet pipe (4), the second air inlet pipe (11), and the air outlet pipe (3). The air inlet of the pump inlet pipe (4) is an explosion-proof air inlet, and the air outlet of the air outlet pipe (3) is connected to a connector (34).

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