A mobile harmful gas over-limit detection device

Abstract

This invention discloses a mobile hazardous gas over-limit detection device, belonging to the technical field of gas detection equipment. It includes a detector with a detection probe inside, and an inlet pipe and an outlet pipe installed on the top of the detector. A protective cylinder is installed inside the detector to surround and protect the detection probe. A telescopic cylinder is slidably mounted outside the protective cylinder for docking or separating from the outlet pipe, and a fan is installed inside the telescopic cylinder. A shaft is installed inside the outlet pipe. This mobile hazardous gas over-limit detection device, through the design of the protective cylinder and telescopic cylinder, achieves comprehensive and differentiated cleaning of the pipeline and detection probe. It protects the detection probe through low-flow directional purging and removes pipeline residues through high-flow closed purging, effectively avoiding residual interference during cross-regional detection, improving the accuracy and reliability of detection data, and adapting to the actual needs of multi-scenario mobile detection.

Description

Technical Field

[0001] This invention relates to the field of gas detection equipment technology, and in particular to a mobile hazardous gas over-limit detection device. Background Technology

[0002] A gas detector is an instrument used to detect gas leaks and concentrations. These include portable gas detectors, handheld gas detectors, stationary gas detectors, and online gas detectors. They primarily utilize gas sensors to detect the types of gases present in the environment; gas sensors are used to detect the composition and concentration of gases.

[0003] In existing hazardous gas over-limit detection equipment, some residual gas substances inevitably adhere to the inner wall of the air inlet after gas detection. This problem is particularly significant in multi-area patrol detection scenarios: when the equipment moves from one detection area to another, if the residual substances on the inner wall of the air inlet are not removed in time, the newly collected gas sample will mix with the residual substances, or the residual substances themselves will undergo desorption and reaction, causing the gas concentration data obtained by the detection module to deviate from the true value, making it difficult to accurately reflect the true safety status of the detection area, which may trigger false alarms or missed alarms, posing a great hidden danger to on-site safety protection.

[0004] Therefore, it is necessary to propose a mobile hazardous gas over-limit detection device to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a mobile hazardous gas over-limit detection device to solve the problem that when the device moves from one detection area to another, if the residual substances on the inner wall of the air inlet are not removed in time, the newly collected gas sample will mix with the residual substances, or the residual substances themselves will undergo desorption and reaction, causing the gas concentration data obtained by the detection module to deviate from the true value, making it difficult to accurately reflect the true safety status of the detection area, which may lead to false alarms or missed alarms, and pose a great hidden danger to on-site safety protection.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a mobile hazardous gas over-limit detection device, comprising a detector, the detector having a detection probe inside, and an inlet pipe and an outlet pipe installed on the top of the detector;

[0007] The detector has a protective cylinder inside to surround and protect the detection probe. A telescopic cylinder is slidably installed on the outside of the protective cylinder to connect or disconnect with the air outlet pipe. A fan is installed inside the telescopic cylinder.

[0008] The air outlet pipe has a shaft inside, and a top plug for controlling the opening and closing of the air outlet pipe is slidably mounted on the shaft. The top of the top plug has an inclined groove, and the inner wall of the air outlet pipe has an inner groove.

[0009] During testing, external gas enters the protective cylinder through the inlet pipe and the side of the protective cylinder and comes into contact with the detection probe. At the same time, the gas pushes the top plug to slide upward and is discharged.

[0010] During backflushing, the gas cylinder outlet end is inserted into the outlet pipe, and its pin contacts the shaft; in the first stage, the bottom end of the shaft abuts against the fan, and the inclined groove connects with the inner groove to supply a small flow of gas from inside the gas cylinder to backflush the detection probe; in the second stage, the telescopic cylinder wraps around the protective cylinder, and the top plug closes the top of the telescopic cylinder, and a large flow of gas from inside the gas cylinder backflushes the inlet pipe.

[0011] Preferably, an inner plate for assisting the stable sliding of the shaft is fixedly installed on the inner wall of the telescopic cylinder, a second spring that cooperates with the top plug is fitted at the top of the shaft, a third spring that cooperates with the inner plate is fitted at the bottom of the shaft, a first spring is fixed between the top of the telescopic cylinder and the inner wall of the detector, and the elastic support force of the first spring, the third spring and the second spring decreases in sequence.

[0012] Preferably, the protective cylinder has a side groove for gas flow.

[0013] Preferably, a baffle plate is fixedly connected to the bottom of the top plug. The baffle plate is arc-shaped and fits against the inner wall of the air outlet pipe. The baffle plate is close to the air inlet pipe.

[0014] Preferably, the axial length of the air inlet pipe is greater than the axial length of the air outlet pipe.

[0015] Preferably, a filter plate for intercepting impurities is fixedly installed on the top of the air intake pipe. The filter plate includes an elastic element and a rigid element. The elastic element is fixedly connected to the inner wall of the air intake pipe, and the rigid element is fixedly connected inside the elastic element.

[0016] Preferably, a circular plate is rotatably arranged inside the intake pipe, and magnetic components for assisting its resetting are arranged on both sides of the circular plate. The magnetic components include a second magnet and a third magnet. The second magnet is fixedly embedded in the inner wall of the intake pipe, and the third magnet is fixedly embedded in the outer wall of the circular plate. The second magnet and the third magnet attract each other. A first magnet is fixedly embedded in the bottom of the rigid part, and the first magnet and the third magnet repel each other.

[0017] Preferably, the circular plate is provided with a sliding box, and a counterweight ball is placed inside the sliding box.

[0018] Preferably, both ends of the sliding box are fixed with elastic sheets, and the elastic sheets have through holes.

[0019] Preferably, the height of the inner groove is greater than the height of the top plug.

[0020] The technical effects and advantages of this invention are as follows:

[0021] 1. This invention achieves comprehensive and differentiated cleaning of pipelines and detection probes by setting up protective cylinders, telescopic cylinders and other structures. It protects the detection probes through small-flow directional purging and removes pipeline residues through large-flow closed purging, effectively avoiding residual interference during cross-regional testing, improving the accuracy and reliability of test data, and adapting to the actual needs of multi-scenario roving testing.

[0022] 2. The structure of the top plug is set so that the gas entering the protective cylinder will accumulate briefly, which effectively increases the contact area between the gas and the detection probe, prolongs the contact time, and ensures that the gas to be tested is fully diffused to the sensitive area of ​​the detection probe. This avoids insufficient contact due to excessive gas flow rate, which would affect the detection accuracy. When not being tested, the top plug will close the top of the gas outlet pipe to prevent impurities from entering.

[0023] 3. The backflush gas inside the gas cylinder enters the protective cylinder in a small flow rate through the channel formed by the inclined groove and the inner groove to achieve directional cleaning. The bottom end of the shaft abuts against the fan drive shaft, preventing the fan from rotating and avoiding damage to the fan drive components due to forced dragging and rotation.

[0024] 4. The telescopic cylinder is wrapped around the outside of the protective cylinder. The backflush gas enters the interior of the detection chamber directly through the inclined groove, and blows back the residual gas in the detection chamber and the inner wall of the air inlet pipe in a large flow. The gas and residue are discharged through the air inlet pipe.

[0025] 5. The circular plate and other structures are set up so that during the detection and backflushing stages, the circular plate rotates, which pushes the hard parts of the filter plate to swing and shake off the impurities accumulated on the filter plate, ensuring the efficiency of detection or backflushing. At the same time, the counterweight ball slides with the sliding box and generates inertial impact force, periodically hitting the sliding box to generate vibration, preventing residues from appearing on the sliding box and the circular plate.

[0026] 6. The system incorporates elastic sheets and through holes to flush away residual harmful gas molecules and fine impurities, further enhancing the cleaning effect. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the mobile hazardous gas over-limit detection device of the present invention.

[0028] Figure 2 This is a cross-sectional structural diagram of the circulating hazardous gas over-limit detection device of the present invention.

[0029] Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0030] Figure 4 For the present invention Figure 2 Enlarged schematic diagram of the structure at point B.

[0031] Figure 5 This is a schematic diagram of the protective cylinder and telescopic cylinder structure of the present invention.

[0032] Figure 6 This is a schematic diagram of the elastic sheet and through-hole structure of the present invention.

[0033] Figure 7 This is a schematic diagram of the top plug and inclined groove structure of the present invention.

[0034] Figure 8 This is a schematic diagram of the first stage of backflushing in the circulating hazardous gas over-limit detection device of the present invention.

[0035] Figure 9 For the present invention Figure 8 Enlarged schematic diagram of the structure at point C.

[0036] Figure 10 For the present invention Figure 9 Enlarged schematic diagram of the structure at point D.

[0037] Figure 11 This is a schematic diagram of the second stage of backflushing in the circulating hazardous gas over-limit detection device of the present invention.

[0038] Figure 12 For the present invention Figure 11 Enlarged schematic diagram of the structure at point E in the middle.

[0039] Figure 13 This is a schematic diagram of the detection operation of the mobile hazardous gas over-limit detection equipment of the present invention.

[0040] Figure 14 For the present invention Figure 13 Enlarged schematic diagram of the structure at point F.

[0041] In the diagram: 1. Detector; 101. Detection chamber; 2. Inlet pipe; 3. Outlet pipe; 4. Detection probe; 5. Protective cylinder; 501. Side groove; 6. Telescopic cylinder; 7. First spring; 8. Fan; 9. Inner plate; 10. Shaft; 1001. Middle ring; 1002. Bottom ring; 11. Top plug; 1101. Sliding sleeve; 12. Inclined groove; 13. Inner groove; 14. Second spring; 15. Third spring; 16. Baffle plate; 17. Filter plate; 1701. Elastic component; 1702. Hard component; 18. First magnet; 19. Circular plate; 20. Slide rail; 21. Slide box; 22. Counterweight ball; 23. Elastic sheet; 2301. Through hole; 24. Second magnet; 25. Third magnet; 26. Gas cylinder. Detailed Implementation

[0042] Example 1, the present invention provides as follows Figures 1 to 14The device shown is a mobile hazardous gas over-limit detection device. This device is suitable for multi-area mobile monitoring scenarios such as industrial workshops, underground pipe corridors, and closed warehouses. It can realize real-time collection and over-limit early warning of hazardous gas concentration in a designated area. Its core structure includes a detector 1. The detector 1 adopts a lightweight sealed shell design, which is not only easy for operators to carry and move for mobile detection, but also can resist the corrosion of harsh environments such as dust and water vapor on site, ensuring stable operation of the equipment.

[0043] The detector 1 has a detection chamber 101 at the top. The detection chamber 101 is a hollow cavity structure with an anti-adsorption inert coating (such as Teflon coating) on ​​the inner wall, which can reduce the residue of harmful gas molecules on the inner wall of the chamber and avoid interference with subsequent detection data. The bottom wall of the detection chamber 101 has a reserved adapter installation interface. A gas sensor (not shown in the figure) is fixedly installed inside the detector 1, such as an electrochemical sensor or a catalytic combustion sensor. An electrochemical sensor is used to detect toxic and harmful gases, and a catalytic combustion sensor is used to detect combustible and harmful gases. This type of sensor has the characteristics of fast response speed, high detection accuracy and strong stability, which is suitable for the real-time and reliability requirements of cyclic detection. The detection probe 4 of the sensor extends into the interior of the detection chamber 101 through the reserved interface of the chamber to ensure that the detection probe 4 can fully contact the gas to be measured.

[0044] The external panel of the detector 1 integrates interactive components, including a display screen and several function buttons. The display screen is a high-brightness LCD touch screen that can display information such as the type of gas being detected, the current concentration value, the detection time, the device power level, and the over-limit alarm status in real time, making it easy for operators to read intuitively. The function buttons include at least a power on / off button, a mode switch button, a calibration button, and an alarm threshold setting button, which can realize functions such as device start / stop control, switching between roving detection mode and fixed-point detection mode, periodic sensor calibration, and custom setting of over-limit thresholds for different gases, improving the operational flexibility of the device.

[0045] The top of the detector 1 is symmetrically equipped with an inlet pipe 2 and an outlet pipe 3. Both the inlet pipe 2 and the outlet pipe 3 are made of corrosion-resistant hard tubing. Their bottom ends are connected to the detection chamber 101 through a sealing joint to ensure the airtightness of the gas flow channel and prevent gas leakage. In addition, the installation position of the detection probe 4 corresponds to the inlet end of the outlet pipe 3, forming a smooth airflow path of "inlet pipe 2 intake - detection chamber 101 transmission - detection probe 4 detection - outlet pipe 3 exhaust", ensuring that the gas to be tested can fully contact the detection probe 4 and improve the accuracy of the detection data.

[0046] The axial length of the air inlet pipe 2 is greater than the axial length of the air outlet pipe 3, so that the air inlet of the air inlet pipe 2 is far away from the exhaust port area of ​​the air outlet pipe 3, thus avoiding the detection data distortion caused by the re-inhalation of the detected gas discharged from the air outlet pipe 3. In actual use, the air outlet pipe 3 can also be set on the side of the detector 1, and adjusted according to the specific use.

[0047] Considering that after gas detection is completed, some residual gas substances, such as harmful gas molecules, will inevitably adhere to the inner wall of the air inlet pipe 2 and the detection chamber 101, when the equipment moves from one detection area to another, if the residual substances are not removed in time, the newly collected gas sample will mix with the residual substances, or the residual substances themselves will decompose and react, causing the gas concentration data to deviate from the true value and making it difficult to accurately reflect the true safety status of the detection area, this equipment is also equipped with a selectively usable gas cylinder 26 for backflushing and cleaning the air inlet pipe 2, the detection chamber 101, etc.

[0048] Specifically, the outlet end of the gas cylinder 26 can be inserted into the outlet pipe 3 to complete the connection. Its outlet end integrates structures such as a push pin and adopts the control method of "squeezing the push pin to release gas".

[0049] Dry compressed air or inert gas (such as nitrogen) is selected for backflushing: Dry compressed air is readily available and low in cost, and can meet the cleaning needs of most scenarios. It can effectively blow away attached residual gas molecules and light dust; Inert gas has stable chemical properties and will not react with residual harmful gases, nor will it corrode the inert coating on the inner wall of the detection chamber 101 and the detection probe 4. It is suitable for scenarios that detect corrosive harmful gases, ensuring that the backflushing process is safe and does not generate secondary interference.

[0050] In addition, considering that the sensitive elements of the detection probe 4 (such as electrochemical electrodes and catalytic combustion elements) are usually less resistant to airflow impact, if the backflushing gas directly washes over the sensitive elements, it can easily cause physical damage to the elements (such as electrode coating peeling) or performance degradation, reducing detection accuracy and sensor lifespan. Therefore, in order to prevent the backflushing gas from contacting the detection probe 4 for a long time, a protective cylinder 5 is fixedly installed at the bottom of the detection chamber 101. The protective cylinder 5 surrounds the outside of the detection probe 4. The side of the protective cylinder 5 has a side groove 501 for gas flow, and the side groove 501 is located on the side of the protective cylinder 5 near the air inlet pipe 2.

[0051] The protective cylinder 5 is externally fitted with a telescopic cylinder 6. To ensure the stability of the sliding, the outer wall of the protective cylinder 5 is machined with a guide groove along the axial direction. The inner wall of the telescopic cylinder 6 is integrally formed with a sliding boss. The sliding boss is embedded in the guide groove to form a limiting sliding fit. Limiting blocks are provided at both the upper and lower ends of the guide groove to prevent the telescopic cylinder 6 from sliding excessively and causing structural damage (not shown in the figure). In addition, an annular fluororubber sealing ring is embedded on the inner side of the top of the telescopic cylinder 6. When the telescopic cylinder 6 slides upward to abut the top of the detection chamber 101, the sealing ring can enhance the airtightness of the connection between the telescopic cylinder 6 and the air outlet pipe 3, ensuring that the two are accurately connected to form a closed airflow channel. When the telescopic cylinder 6 slides downward to the sliding boss abutting the limiting block at the bottom of the guide groove, the telescopic cylinder 6 and the air outlet pipe 3 are completely separated, and the air passage is disconnected.

[0052] The telescopic cylinder 6 is equipped with a fan 8, which includes a micro DC drive motor, fan blades and other structures. During the detection phase, the fan 8 can realize the airflow inside and outside the detection chamber 101, and promote the full contact between the gas to be tested and the detection probe 4.

[0053] The fan 8 is powered by the lithium battery built into the detector 1. The power supply line is laid through the pre-set wiring groove on the inner wall of the telescopic cylinder 6 to adapt to the wiring stretching requirements during the sliding process of the telescopic cylinder 6.

[0054] An inner plate 9 is fixedly connected to the inner wall of the telescopic cylinder 6. A shaft 10 is slidably mounted on the inner plate 9, extending into the interior of the air outlet pipe 3. A middle ring 1001 is fixedly connected to the middle section of the shaft 10, and a top plug 11 is slidably mounted on the upper half of the shaft 10. The movement of the top plug 11 controls the opening and closing of the top of the air outlet pipe 3. A sliding sleeve 1101 is fixedly connected to the bottom of the top plug 11, and the sliding sleeve 1101 is slidably mounted on the shaft 10. A second spring 14 is fitted onto the outside of the shaft 10. The top of the second spring 14... The bottom end of the first spring 14 is fixedly connected to the bottom of the sliding sleeve 1101, and the bottom end of the second spring 14 is fixedly connected to the top of the middle ring 1001. The bottom end of the shaft 10 is fixedly connected to the bottom ring 1002, which abuts against the drive shaft of the fan 8. The shaft 10 is fitted with a third spring 15, the top end of which is fixedly connected to the bottom of the inner plate 9, and the bottom end of which is fixedly connected to the bottom ring 1002. The bottom of the bottom ring 1002 is provided with anti-slip texture and other structures to improve the friction between it and the drive shaft of the fan 8.

[0055] In addition, a first spring 7 is fixed between the top of the telescopic cylinder 6 and the inner wall of the detector 1. The elastic support forces of the first spring 7, the third spring 15, and the second spring 14 decrease sequentially. This elastic gradient design can realize the orderly linkage of the actions of each component: in the initial stage of backflush, only a small external force is needed to push the top plug 11 down. After the second spring 14 is fully contracted, the top plug 11 drives the shaft 10 to move down synchronously. When the bottom end of the shaft 10 abuts against the fan 8 and the top plug 11 abuts against the top of the telescopic cylinder 6, the telescopic cylinder 6 begins to move downward. The elastic support force of the third spring 15 is greater than the elastic support force at the top pin of the gas cylinder 26.

[0056] The top of the top plug 11 has a sloping groove 12, and the inner wall of the air outlet pipe 3 has an inner groove 13, the height of which is greater than the height of the top plug 11.

[0057] The actual working conditions are as follows:

[0058] During testing (refer to) Figure 13 , Figure 14 When the fan 8 is running, the external gas to be tested enters the interior of the protective cylinder 5 through the air inlet pipe 2, the detection chamber 101, and the side groove 501, and comes into contact with the detection probe 4 to complete the concentration detection. At the same time, the gas entering generates an upward thrust, which pushes the top plug 11 to slide upward against the slight compression force of the second spring 14, so that the exhaust port at the top of the air outlet pipe 3 remains open, and the detected gas is smoothly discharged through the exhaust port of the air outlet pipe 3.

[0059] During this process, the exhaust port at the top of the exhaust pipe 3 needs to be pushed upward by the gas thrust to overcome the slight compression force of the second spring 14 before it can be opened. Before the top plug 11 is fully slid into place and the exhaust port is fully opened, the gas entering the protective cylinder 5 will accumulate briefly. This brief accumulation state can effectively increase the contact area between the gas and the detection probe 4, prolong the contact time, and ensure that the gas to be tested is fully diffused to the sensitive area of ​​the detection probe 4, avoiding insufficient contact due to excessive gas flow rate, which would affect the detection accuracy. After the thrust generated by the gas accumulation is sufficient to push the top plug 11 to slide completely upward, the exhaust port at the top of the exhaust pipe 3 opens, and the gas that has been tested is quickly discharged.

[0060] In addition, when not being tested, the top plug 11 closes the top of the vent pipe 3 to prevent impurities from entering.

[0061] First stage of counter-blowout (refer to) Figure 8 , Figure 9 , Figure 10Insert the gas cylinder 26 outlet end into the gas outlet pipe 3. The gas cylinder 26 contacts the top plug 11. Due to the minimum elastic support force of the second spring 14, the top plug 11 moves downward. Then, the top pin of the gas cylinder 26 contacts the top of the shaft 10. The top pin is squeezed, causing the gas cylinder 26 to discharge gas. After the second spring 14 is fully contracted, the shaft 10 and the top plug 11 move downward synchronously until the bottom end of the shaft 10 abuts the drive shaft of the fan 8, and the fan 8 cannot rotate. At this time, the inclined groove 12 at the top of the top plug 11 is connected to the inner groove 13 on the inner wall of the gas outlet pipe 3. The backflush gas in the gas cylinder 26 enters the protective cylinder 5 in a small flow through the channel formed by the inclined groove 12 and the inner groove 13. With the cooperation of the fan blades of the fan 8, a turbulent airflow is formed, which blows away the residual gas and impurities on the surface of the detection probe 4 and discharges it through the side groove 501, realizing directional cleaning.

[0062] It should be noted that the corresponding connection between the inclined groove 12 and the inner groove 13 is a transitional short-term connection, not a continuous connection. This allows for the rapid introduction of a small flow of gas during the initial backflushing phase, completing the preliminary cleaning of the residue on the surface of the detection probe 4, while avoiding excessive airflow impact on the sensitive elements of the probe during continuous purging. At the same time, after the bottom end of the shaft 10 abuts against the drive shaft of the fan 8, it will form a rigid limit and fixation on the fan 8, preventing the fan 8 from rotating. This design can effectively prevent the backflushing airflow from driving the fan 8 to rotate passively when passing through the air passage, avoiding damage to the drive components of the fan 8 (such as the micro DC motor) due to forced dragging and rotation, and ensuring the service life of the drive components and the stability of subsequent operation.

[0063] Second stage of counter-blowout (refer to) Figure 11 , Figure 12 ): Continue to increase the external force to squeeze the gas cylinder 26, causing the shaft 10 and the top plug 11 to move further down until the middle ring 1001 abuts against the inner plate 9, and the top plug 11 closes the top of the telescopic cylinder 6; at this time, the external force overcomes the elastic support force of the first spring 7, pushing the telescopic cylinder 6 to slide down along the outer wall of the protective cylinder 5, and finally wraps around the outside of the protective cylinder 5, the side groove 501 closes, the top plug 11 moves to below the air outlet pipe 3, and the backflush gas enters the interior of the detection chamber 101 directly from the inclined groove 12, and blows back the residual gas in the detection chamber 101 and the inner wall of the air inlet pipe 2 in a large flow rate, and the gas and residue are discharged from the air inlet pipe 2.

[0064] In summary, by setting up structures such as the protective cylinder 5 and the telescopic cylinder 6, this invention achieves comprehensive and differentiated cleaning of the pipeline and the detection probe 4. It protects the detection probe 4 through small-flow directional purging and removes pipeline residues through large-flow closed purging, effectively avoiding residual interference during cross-regional testing, improving the accuracy and reliability of test data, and adapting to the actual needs of multi-scenario patrol testing.

[0065] To further reduce the mutual interference between the inlet pipe 2 and the outlet pipe 3, a baffle 16 is fixedly connected to the bottom of the top plug 11. The baffle 16 is arc-shaped and fits against the inner wall of the outlet pipe 3, while the baffle 16 is close to the inlet pipe 2. During the detection phase, when the detected gas is discharged from the outlet pipe 3, the baffle 16 can block the discharged airflow from diffusing towards the inlet pipe 2, preventing the detected gas from flowing back into the inlet pipe 2 and being re-inhaled.

[0066] A filter plate 17 for intercepting impurities is fixedly installed on the top of the air intake pipe 2. The filter plate 17 includes an elastic element 1701 and a rigid element 1702. The elastic element 1701 is fixedly connected to the inner wall of the air intake pipe 2, and the rigid element 1702 is fixedly connected to the inside of the elastic element 1701. The elastic element 1701 is made of corrosion-resistant rubber, and the rigid element 1702 is made of stainless steel filter screen. It is fixedly connected to the inside of the elastic element 1701 by both adhesive and snap fasteners to ensure structural strength.

[0067] The filter plate 17 has a suitable pore size, and its interception targets are fine dust and small solid particles (such as metal shavings in industrial workshops and dust flocculent matter in closed warehouses), preventing these fine impurities from entering the air inlet pipe 2 and the detection chamber 101; while during backflushing, the remaining are harmful gas residual molecules, which can pass through the filter pores; in addition, backflushing can also remove impurities that have accumulated on the filter plate 17 due to interception.

[0068] The intake pipe 2 has a rotating circular plate 19 inside. The outer ring wall of the circular plate 19 is provided with a rubber ring and other structures to ensure sealing and reduce wear. Both sides of the circular plate 19 are provided with magnetic components to assist its reset. The magnetic components include a second magnet 24 and a third magnet 25. The second magnet 24 is fixedly embedded in the inner wall of the intake pipe 2, and the third magnet 25 is fixedly embedded in the outer wall of the circular plate 19. The second magnet 24 and the third magnet 25 attract each other, and the two third magnets 25 have the same magnetism on the side that is far away from each other. The bottom of the rigid part 1702 is fixedly embedded with a first magnet 18, and the first magnet 18 and the third magnet 25 repel each other.

[0069] A sliding box 21 is fixedly connected to the circular plate 19. The length of the sliding box 21 is less than the diameter of the circular plate 19. The circular plate 19 and the sliding box 21 are arranged in a cross shape, forming a "fan blade" structure. A counterweight ball 22 is placed inside the sliding box 21, and the sliding box 21 is tilted. This design allows the circular plate 19 to be in a horizontal, static state (refer to...). Figure 4The weight of the sliding box 21 and the internal counterweight ball 22 cannot be evenly distributed, and the forces on both sides of the circular plate 19 are inconsistent, forming a natural force imbalance. This force imbalance can cause the circular plate 19 to flip rapidly in two core working conditions: First, in the suction working condition of the detection stage, the suction airflow inside the equipment acts on the tilted sliding box 21, and with the force difference on both sides, it can quickly break the horizontal static state of the circular plate 19, causing the circular plate 19 to flip, ensuring the airflow in the air inlet pipe 2, and allowing the gas to be tested to enter the detection chamber 101 more quickly; Second, in the airflow impact working condition of the backflushing stage, when the backflushing airflow acts on the tilted sliding box 21, the force imbalance will be further amplified, causing the circular plate 19 to flip rapidly.

[0070] During the detection and backflushing stages, the circular plate 19 rotates, and the third magnets 25 on both sides periodically repel the first magnet 18 at the bottom of the filter plate 17, pushing the hard part 1702 of the filter plate 17 to swing, shaking off the impurities accumulated on the filter plate 17, ensuring the efficiency of detection or backflushing; at the same time, the counterweight ball 22 slides with the sliding box 21 and generates inertial impact force, periodically hitting the sliding box 21 to generate vibration, preventing residues from appearing on the sliding box 21 and the circular plate 19.

[0071] In addition, when not in use, the circular plate 19 is in a horizontally stationary state, maintaining the closure of the air intake pipe 2.

[0072] The circular plate 19, sliding box 21 and other structures are lightweight and rotate smoothly, ensuring rapid feedback when subjected to airflow.

[0073] In embodiment 2, a slide 20 is provided on the circular plate 19. The slide 20 is inclined, and a slide box 21 is slidably disposed inside the slide 20. The slide 20 is inclined, so that the slide box 21 slidably assembled inside it is inclined.

[0074] Both ends of the sliding box 21 are fixed with elastic sheets 23. The elastic sheets 23 have through holes 2301. The elastic sheets 23 are made of lightweight plastic. Multiple through holes 2301 are evenly opened on the elastic sheets 23.

[0075] When the elastic sheet 23 oscillates as the sliding box 21 slides and the circular plate 19 rotates, the through hole 2301 allows the airflow to form multiple fine vortices. These vortices can penetrate deep into the gap between the sliding box 21 and the slide rail 20, and the fine grooves on the surface of the circular plate 19, thus flushing away residual harmful gas molecules and fine impurities, further improving the cleaning effect. When the sliding box 21 slides along the slide rail 20 to the end and impacts the circular plate 19, the elastic deformation of the elastic sheet 23 can buffer the impact force, preventing damage to the sliding box 21 and the circular plate 19 due to rigid impact, while reducing wear on the components caused by the impact and extending the service life. When the airflow passes through the through hole 2301, it will generate a reverse flushing force on the surface of the elastic sheet 23, which can blow away the impurities attached to the surface of the elastic sheet 23, realizing the self-cleaning of the elastic sheet 23 and preventing the accumulation of impurities from affecting the oscillation effect.

Claims

1. A mobile hazardous gas over-limit detection device, comprising a detector (1), wherein the detector (1) has a detection probe (4) inside, characterized in that: The top of the detector (1) is equipped with an air inlet pipe (2) and an air outlet pipe (3); The detector (1) has a protective cylinder (5) installed inside for surrounding the protective detection probe (4), and a telescopic cylinder (6) is slidably provided on the outside of the protective cylinder (5) for docking or separating from the air outlet pipe (3). A fan (8) is installed inside the telescopic cylinder (6). The air outlet pipe (3) is provided with a shaft (10), and a top plug (11) for controlling the opening and closing of the air outlet pipe (3) is slidably provided on the shaft (10). The top of the top plug (11) has a groove (12), and the inner wall of the air outlet pipe (3) has an inner groove (13). During the test, external gas enters the protective cylinder (5) from the side of the air inlet pipe (2) and the protective cylinder (5) and comes into contact with the detection probe (4). At the same time, the gas pushes the top plug (11) to slide upward and be discharged. During backflushing, the outlet end of the gas cylinder (26) is inserted into the outlet pipe (3), and its pin contacts the shaft (10); in the first stage, the bottom end of the shaft (10) abuts against the fan (8), and the inclined groove (12) and the inner groove (13) are connected to supply the gas cylinder (26) with a small flow backflushing detection probe (4); in the second stage, the telescopic cylinder (6) wraps around the protective cylinder (5), and the top plug (11) closes the top of the telescopic cylinder (6), and the gas cylinder (26) backflushes the inlet pipe (2) with a large flow. An inner plate (9) for assisting the stable sliding of the shaft (10) is fixedly installed on the inner wall of the telescopic cylinder (6). A second spring (14) that cooperates with the top plug (11) is fitted at the top of the shaft (10). A third spring (15) that cooperates with the inner plate (9) is fitted at the bottom of the shaft (10). A first spring (7) is fixed between the top of the telescopic cylinder (6) and the inner wall of the detector (1). The elastic support force of the first spring (7), the third spring (15), and the second spring (14) decreases in sequence. The protective cylinder (5) has a side groove (501) for gas flow on its side.

2. The mobile hazardous gas over-limit detection device according to claim 1, characterized in that: The bottom of the top plug (11) is fixedly connected to a baffle (16). The baffle (16) is arc-shaped and fits against the inner wall of the air outlet pipe (3). The baffle (16) is close to the air inlet pipe (2).

3. The mobile hazardous gas over-limit detection device according to claim 1, characterized in that: The axial length of the air inlet pipe (2) is greater than the axial length of the air outlet pipe (3).

4. The mobile hazardous gas over-limit detection device according to claim 1, characterized in that: A filter plate (17) for intercepting impurities is fixedly installed on the top of the air intake pipe (2). The filter plate (17) includes an elastic element (1701) and a rigid element (1702). The elastic element (1701) is fixedly connected to the inner wall of the air intake pipe (2), and the rigid element (1702) is fixedly connected to the inside of the elastic element (1701).

5. The mobile hazardous gas over-limit detection device according to claim 4, characterized in that: The intake pipe (2) is rotatably provided with a circular plate (19). Both sides of the circular plate (19) are provided with magnetic components to assist its reset. The magnetic components include a second magnet (24) and a third magnet (25). The second magnet (24) is fixedly embedded in the inner wall of the intake pipe (2), and the third magnet (25) is fixedly embedded in the outer wall of the circular plate (19). The second magnet (24) and the third magnet (25) attract each other. The bottom of the rigid part (1702) is fixedly embedded with a first magnet (18). The first magnet (18) and the third magnet (25) repel each other.

6. The mobile hazardous gas over-limit detection device according to claim 5, characterized in that: A sliding box (21) is provided on the circular plate (19), and a counterweight ball (22) is placed inside the sliding box (21).

7. The mobile hazardous gas over-limit detection device according to claim 6, characterized in that: Both ends of the slide box (21) are fixed with elastic sheets (23), and the elastic sheets (23) have through holes (2301).

8. The mobile hazardous gas over-limit detection device according to claim 1, characterized in that: The height of the inner groove (13) is greater than the height of the top plug (11).

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