Portable gas detector

Abstract

The invention discloses a portable gas detector which comprises a suction pump type gas detector body and a storage part, a gas inlet in the gas detector body is arranged on the outer side to suck gas, the gas inlet is arranged at the upward position of the outer side of the gas detector body, and the storage part is arranged on one side of the gas inlet of the gas detector body. The air suction part is arranged in the storage part, and the air suction part is connected with the air inlet of the gas detector body, so that the air suction part extends to the detection area to suck air to detect the gas; the telescopic piece does not need a support in the using process, deformation is not prone to occurring in the actual using process, the gas passing ability is good, extrusion and blockage are avoided, self-cleaning can be achieved, the filtering assembly can obstruct impurities in gas flow, the service life of the gas detector body is prolonged, and the gas detector is suitable for popularization and application. The cleaning period of the interior of the gas detector body is prolonged, and the situation that the accuracy of gas detection is reduced after gas is interfered by impurities is prevented.

Description

Technical Field

[0001] This invention relates to the field of gas detector technology, specifically a portable gas detector. Background Technology

[0002] Portable gas detectors are handheld or portable devices used to detect gas concentrations in the environment. There are two types of gas sampling methods: pump-type and diffusion-type. Pump-type detectors have a built-in miniature suction pump that actively extracts gas for detection, suitable for locations where personnel cannot easily enter, such as pipes and sewers. Diffusion-type detectors rely on the natural diffusion of gas into the sensor, suitable for gas detection in open spaces. In practical use, portable gas detectors are typically designed for single-handed operation and equipped with an LCD screen for easy reading of gas concentration values ​​in various environments. The sensors are mostly plug-and-play, requiring no complex calibration procedures.

[0003] Application publication number CN118962031A discloses a portable gas detector, relating to the field of gas detection technology. It includes a winding unit comprising a winding sleeve, the winding sleeve including a connecting plate disposed inside it, a connecting shaft disposed on the upper surface of the connecting plate, and a grip disposed inside the winding sleeve, the grip including a vertical rod and a winding roller disposed outside the connecting shaft; and an anti-detachment unit comprising a sliding cover, a sliding plate disposed inside the sliding cover, and a tightening strap disposed at the end of the sliding plate; the surface of the grip is in contact with the end of the sliding plate. The beneficial effects of this invention are that the hose can be wound around the outside of the winding roller, ensuring the hose is neater during use; simultaneously, the anti-detachment unit ensures the device stays firmly in the user's hand, effectively preventing the device from slipping out; thus making it more convenient for operators to use.

[0004] However, the above application documents still have the following problems:

[0005] 1. The design uses a flexible hose as an extension suction device. However, in actual applications, the hose is easily deformed by objects, which reduces the efficiency of gas passage. At the same time, repeated winding of the hose will gradually cause deformation and compression. Therefore, in order to ensure the normal operation of gas detection, the hose needs to be replaced frequently, resulting in low utilization efficiency.

[0006] 2. Although the hose has the function of working inside tortuous and narrow pipes during the extension process, it lacks support when absorbing gas from unobstructed high places, which will result in the inability to effectively absorb air.

[0007] 3. When the hose absorbs gas, some gases containing impurities will cause impurities to adhere to the inner wall of the hose as they pass through, gradually reducing the internal space of the hose. Furthermore, this will affect the accuracy of gas detection when absorbing different gases for testing.

[0008] Therefore, we have made improvements to this and proposed a portable gas detector. Summary of the Invention

[0009] In view of the problems existing in the above or prior art, the present invention is proposed.

[0010] Therefore, the object of the present invention is to provide a portable gas detector.

[0011] To solve the above-mentioned technical problems, the present invention provides the following technical solution, including:

[0012] The gas detector body is a suction pump type, wherein the air inlet on the gas detector body is located on the outside for air intake, and the air inlet is located on the outside of the gas detector body at an upward position.

[0013] A storage section is installed on one side of the air inlet of the gas detector body;

[0014] The suction section is located inside the housing section and is connected to the air inlet of the gas detector body, thereby extending to the detection area to draw in the detection gas.

[0015] In a preferred embodiment of the portable gas detector of the present invention, the storage part includes a retaining tube fixed to one side of the gas detector body, a vent hole penetrating the air inlet on one side of the retaining tube, a storage groove on the surface of the retaining tube, an air intake part disposed in the inner cavity of the storage groove, a positioning groove on the surface of the storage groove, a positioning rod fixedly installed in the inner cavity of the positioning groove, a sealing cover movably installed at one end of the positioning rod, a magnetic block fixedly installed at one end of the sealing cover, and the retaining tube is made of a magnetically attractive metal material.

[0016] In a preferred embodiment of the portable gas detector of the present invention, the air intake includes a steering component disposed inside the storage groove, one end of the steering component is provided with a telescopic component for absorbing gas, and a bellows is fixedly installed on the outside of the steering component, with one end of the bellows communicating with one end of the vent hole.

[0017] In a preferred embodiment of the portable gas detector of the present invention, the steering component includes a steering rod fixed in the inner cavity of the storage groove, a steering block movably mounted in the middle of the steering rod, elastic limiting blocks fixedly mounted on both outer sides of the steering block, two limiting grooves that engage with the corresponding limiting blocks on both sides of the inner wall of the storage groove, a gas transmission hole on the surface of the steering block, one end of the transmission hole being connected to one end of the bellows for gas transmission, and the other end of the transmission hole being connected to one end of the telescopic component.

[0018] As a preferred embodiment of the portable gas detector of the present invention, the telescopic component includes a first tube body threadedly connected to the location of the transmission hole of the steering block. The outer surface of the steering block connected to the first tube body is wrapped with a first sealing ring. The inner cavity of the first tube body is provided with multiple stages of second tube bodies. Each end of the multiple stages of second tube bodies is fixedly installed with a second sealing ring. The inner cavities of the multiple stages of second tube bodies are interconnected, and their dimensions gradually decrease from bottom to top. The top of the second tube body located at the very top is provided with a guide hole for gas absorption.

[0019] As a preferred embodiment of the portable gas detector of the present invention, the following features are provided: a filter assembly for filtering airflow impurities is provided at the bottom of the inner cavity of the first tube; a friction heating mechanism is also provided at the bottom of the inner cavity of the first tube; the gas detector body has an internal electrochemical sensor, a catalytic combustion sensor, and a suction pump; and a separate control switch for the suction pump is provided on the gas detector body.

[0020] In a preferred embodiment of the portable gas detector of the present invention, the filter assembly includes an assembly ring threadedly connected to the inner cavity of a first tube, a support frame fixedly installed in the inner cavity of the assembly ring, an output rod movably installed in the middle of the support frame via a bearing, a conical filter screen fixedly installed at one end of the output rod, a drain device provided on the outer wall of the first tube at the location of the filter screen, and the other end of the output rod being installed externally with the heating mechanism.

[0021] In a preferred embodiment of the portable gas detector of the present invention, the sewage discharge component includes a cleaning groove formed on the surface of the first tube, a sealing door is connected to the side wall of the cleaning groove, and a latch is provided between the sealing door and the outer wall of the first tube.

[0022] In a preferred embodiment of the portable gas detector of the present invention, the heating mechanism includes a transmission rod fixed on the output rod, an impeller fixedly mounted at one end of the transmission rod, a first heating element fixedly mounted on the surface of the impeller blades, and a second heating element threadedly connected to the inner cavity of the transmission hole on the steering block, wherein the surfaces of the first heating element and the second heating element are in contact with each other.

[0023] In a preferred embodiment of the portable gas detector of the present invention, an isolation cover is fixedly installed at one end of the second tube at the top of the multi-stage system, and a miniature fan is fixedly installed inside the cavity of the isolation cover.

[0024] Beneficial effects

[0025] In this application, both the first and second tubes on the telescopic component are made of hard metal, requiring no support during use. Therefore, they are not easily deformed during actual use, ensuring good gas flow. Furthermore, they do not experience compression or blockage during repeated recovery processes and can achieve self-cleaning. In conjunction with the filter component, they can block impurities in the airflow, preventing them from entering the gas detector body and extending its service life and internal cleaning cycle. At the same time, the handling of impurities ensures the stability of the gas transmission space and prevents the gas from being affected by impurities, thus reducing the accuracy of gas detection. Attached Figure Description

[0026] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic diagram of the structure of a portable gas detector according to the present invention;

[0028] Figure 2 This is a schematic diagram of the storage section of a portable gas detector according to the present invention;

[0029] Figure 3 This is a schematic cross-sectional view of the telescopic component of a portable gas detector according to the present invention;

[0030] Figure 4 This is a schematic diagram of the steering component structure of a portable gas detector according to the present invention;

[0031] Figure 5 This is an enlarged structural diagram of the telescopic component of a portable gas detector according to the present invention;

[0032] Figure 6 This is a schematic diagram of the filter component structure of a portable gas detector according to the present invention.

[0033] In the diagram: 1. Gas detector body; 2. Storage section; 201. Fixing tube; 202. Vent hole; 203. Storage slot; 204. Positioning slot; 205. Positioning rod; 206. Sealing cover; 207. Magnetic block; 3. Suction section; 4. Steering component; 401. Steering rod; 402. Steering block; 403. Limiting block; 404. Limiting slot; 405. Transmission hole; 5. Telescopic component; 501. First tube body; 502. Second tube body; 503. Second sealing ring; 504, guide hole; 505, first sealing ring; 6, bellows; 7, filter assembly; 701, assembly ring; 702, support frame; 703, output rod; 704, filter screen; 8, heating mechanism; 801, transmission rod; 802, impeller; 803, first heating element; 804, second heating element; 9, sewage discharge component; 901, cleaning groove; 902, sealing door; 903, latch; 10, miniature fan; 11, isolation cover. Detailed Implementation

[0034] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0035] Reference Figures 1 to 6 ;

[0036] This embodiment provides a portable gas detector, which includes:

[0037] The gas detector body 1 is a suction pump type. The air inlet on the gas detector body 1 is located on the outside for air intake. The air inlet is located on the outside of the gas detector body 1 at an upward position. The air inlet is located at this position mainly to increase the gas absorption length and increase the gas detection range. Specifically, when the user holds the gas detector body 1 of this application and inserts it into the pipe or raises it to a higher position, the air intake range can be increased.

[0038] Storage part 2 is installed on one side of the air inlet of the gas detector body 1. Storage part 2 can cover the air inlet on the gas detector body 1, thus protecting the air inlet from dust and external impacts, and improving the safety of the air inlet on the gas detector body 1.

[0039] The suction section 3 is disposed inside the housing section 2 and is connected to the air inlet of the gas detector body 1, thereby extending to the detection area to absorb the detection gas. The suction section 3 can further extend the detection range of the gas detector body 1 of this application for external gas.

[0040] The storage unit 2 includes a retaining tube 201 fixed to one side of the gas detector body 1. A vent hole 202 is provided on one side of the retaining tube 201, which passes through the air inlet on the gas detector body 1. A storage groove 203 is provided on the surface of the retaining tube 201. The suction unit 3 is located in the inner cavity of the storage groove 203. A positioning groove 204 is provided on the surface of the storage groove 203. A positioning rod 205 is fixedly installed in the inner cavity of the positioning groove 204. A sealing cover 206 is movably installed at one end of the positioning rod 205. A magnetic block 207 is fixedly installed at one end of the sealing cover 206. The retaining tube 201 is made of a magnetic metal material, specifically iron.

[0041] When the gas detector body 1 is not in use, the sealing cover 206 can be manually flipped. At this time, the sealing cover 206 can be rotated under the position limitation of the positioning rod 205 in the positioning groove 204 on the fixing tube 201. In this way, the sealing cover 206 can close the storage groove 203 on the fixing tube 201. At this time, the magnetic block 207 on the sealing cover 206 is magnetically attracted and fixed to the surface of the fixing tube 201. This can effectively seal the air intake part 3, realize the function of preventing dust and squeezing inside, effectively protect the air intake part 3, and also prevent the air inlet of the gas detector body 1 from being exposed to the outside when it is not in use, thus preventing dust and other impurities from entering.

[0042] The suction unit 3 includes a steering component 4 disposed inside the receiving groove 203. One end of the steering component 4 is provided with a telescopic component 5 for absorbing gas. A bellows 6 is fixedly installed on the outside of the steering component 4. The bellows 6 has the characteristic of being telescopic, so it can move telescopically with the steering component 4. One end of the bellows 6 is connected to one end of the vent 202. The specific usage process is as follows: manually pull the telescopic component 5. At this time, the telescopic component 5 can move under the position limit of the steering component 4. Then unfold the telescopic component 5 to the required height, so that external gas can be sucked in. The sucked gas can be transmitted to the air inlet of the gas detector body 1 through the steering component 4 and the bellows 6, and then the gas detection work can be realized.

[0043] The steering component 4 includes a steering rod 401 fixed in the inner cavity of the storage groove 203. A steering block 402 is movably installed in the middle of the steering rod 401. Elastic limiting blocks 403 are fixedly installed on both sides of the outer side of the steering block 402. Two limiting grooves 404 are opened on both sides of the inner wall of the storage groove 203 to engage with the corresponding limiting blocks 403. A gas transmission hole 405 is opened on the surface of the steering block 402. One end of the transmission hole 405 is connected to one end of the bellows 6 to transmit gas, and the other end of the transmission hole 405 is connected to one end of the telescopic component 5.

[0044] The telescopic component 5 includes a first tube 501 threadedly connected to the transmission hole 405 of the steering block 402. The outer surface of the steering block 402 connected to the first tube 501 is wrapped with a first sealing ring 505. The inner cavity of the first tube 501 is provided with multiple stages of second tubes 502. The outer wall of the second tube 502 is in contact with the inner wall of the first tube 501. At the same time, the inner and outer walls of the multiple stages of second tubes 502 are also in contact with each other. A second sealing ring 503 is fixedly installed at the end of each stage of second tubes 502. The inner cavities of the multiple stages of second tubes 502 are interconnected, and the size gradually decreases from bottom to top. The top of the second tube 502 is provided with a gas absorption guide hole 504. Both the first sealing ring 505 and the second sealing ring 503 are made of high-temperature resistant rubber.

[0045] During gas detection, the first tube 501 can be manually pulled. One end of the first tube 501 then rotates via the steering block 402 on the steering component 4, limited by the position of the steering rod 401. Specifically, the first tube 501 rotates from a downward vertical position to an upward vertical position. Then, according to the required gas detection height, the second tube 502 is pulled out step by step. Specifically, the smallest second tube 502 is pulled out first, and then the larger ones are pulled out until the required height is reached for gas detection. Both the first tube 501 and the multiple stages of the second tube 502 are... The rigid metal tube body prevents deformation during gas detection in pipelines or upward positions, ensuring smooth gas flow. After the gas detection is completed, the second tube body 502 can be pressed step by step. At this time, the inner wall of the second tube body 502 will scrape away impurities from the inner walls of the corresponding second tube body 502 and the corresponding first tube body 501 in turn. This achieves the self-cleaning function of the first tube body 501 and the multiple second tube bodies 502, ensuring that impurities will not interfere with the repeated gas intake and detection process, thus improving the accuracy of gas detection.

[0046] The bottom of the inner cavity of the first tube 501 is provided with a filter assembly 7 for airflow impurities. The bottom of the inner cavity of the first tube 501 is also provided with a friction heating mechanism 8. The gas detector body 1 is equipped with an electrochemical sensor, a catalytic combustion sensor and a suction pump. The gas detector body 1 is provided with a separate control switch for the suction pump. The separate control of the suction pump is prior art. In this application, the suction pump can be set to two speeds. The first speed is the speed required for conventional suction detection, and the second speed is required to drive the heating mechanism 8.

[0047] The filter assembly 7 includes an assembly ring 701 threadedly connected to the inner cavity of the first tube 501. A support frame 702 is fixedly installed in the inner cavity of the assembly ring 701. An output rod 703 is movably installed in the middle of the support frame 702 via a bearing. A conical filter screen 704 is fixedly installed at one end of the output rod 703. A drain part 9 is provided on the outer wall of the first tube 501 at the location of the filter screen 704. The other end of the output rod 703 is installed to the outside of the heating mechanism 8.

[0048] When the first tube 501 and the second tube 502 on the telescopic component 5 transmit airflow, the transmitted airflow will pass through the filter screen 704. At this time, the filter screen 704 can filter out solid impurities in the airflow, thus preventing impurities from entering the air inlet of the gas detector body 1. This prevents excessive impurities inside the gas detector body 1 from causing subsequent air detection to fail, thereby improving the service life of the gas detector body 1.

[0049] The sewage discharge component 9 includes a cleaning groove 901 formed on the surface of the first pipe body 501. A sealing door 902 is connected to the side wall of the cleaning groove 901. A latch 903 is provided between the sealing door 902 and the outer wall of the first pipe body 501. The latch 903 adopts existing technology and specifically realizes the connection and fixation between the sealing door 902 and the first pipe body 501.

[0050] When it is necessary to clean the dust and other impurities inside the first tube 501, the latch 903 can be opened, which will open the sealing door 902. This allows the impurities blocked by the filter screen 704 to be cleaned through the cleaning groove 901. After cleaning, the sealing door 902 and latch 903 can be closed again.

[0051] The heating mechanism 8 includes a transmission rod 801 fixed on the output rod 703. An impeller 802 is fixedly installed at one end of the transmission rod 801. A first heating element 803 is fixedly installed on the surface of the blades of the impeller 802. A second heating element 804 is threadedly connected to the inner cavity of the transmission hole 405 on the deflector block 402. The surfaces of the first heating element 803 and the second heating element 804 are in contact with each other.

[0052] Before gas detection, the gas detector body 1 needs to be heated in advance, such as an electrochemical sensor. Gas detection can only be performed when the sensor is at a suitable temperature.

[0053] When the suction pump inside the gas detector body 1 is started, the airflow generated by the suction pump accelerates and drives the impeller 802 at one end of the transmission rod 801 to rotate. At this time, the rotating impeller 802 drives the first heating element 803 and the second heating element 804 to generate heat through friction. The airflow generated by the heating enters the gas detector body 1. The heated airflow helps to improve the heating efficiency of the sensor inside the gas detector body 1, so as to quickly meet the temperature requirements of the sensor. This improves the start-up efficiency of the gas detector body 1 in gas detection.

[0054] An isolation cover 11 is fixedly installed at one end of the second tube body 502 at the top of the multi-stage system. A miniature fan 10 is fixedly installed inside the cavity of the isolation cover 11. The isolation cover 11 can be made of corrosion-resistant metal material, specifically stainless steel. The isolation cover 11 is used to isolate and protect the miniature fan 10. When the miniature fan 10 is started, it can quickly draw in the gas to be detected, thereby improving the gas detection efficiency and avoiding the problem that the extension length of the telescopic part 5 is too large, resulting in a slow air intake speed of the gas detector body 1 and affecting the detection efficiency. At the same time, as the miniature fan 10 accelerates the airflow, the gas detection efficiency is further improved. The airflow will drive the impeller 802 on the heating mechanism 8 to rotate faster, which will increase the speed of the impeller 802. This will increase the vibration force generated by the rotation of the impeller 802, which will not only increase the friction speed between the first heating element 803 and the second heating element 804, but also increase the vibration frequency. This vibration wave can be transmitted to the filter screen 704 on the filter assembly 7. The filter screen 704, which is subjected to high-frequency vibration, can better vibrate and clean the adhering impurities, improve the cleaning effect of impurities on the surface of the filter screen 704, and effectively prevent the filter screen 704 from clogging.

[0055] In summary:

[0056] Before gas detection, the gas detector body 1 can be preheated by turning it on. At this time, the air intake pump in the gas detector body 1 is started simultaneously. The speed of the air intake pump is set to a speed that can drive the impeller 802 inside the heating mechanism 8 to rotate. In this way, the air intake pump drives the impeller 802 to rotate, and the rotating impeller 802 can drive the first heating plate 803 and the second heating plate 804 to rub against each other quickly, thereby achieving friction heating. In this way, the airflow drawn into the gas detector body 1 by the air intake pump will become hot airflow. At this time, the hot airflow will accelerate the heating speed of the sensor inside the gas detector body 1, so that the gas detector body 1 can be put into gas detection state more quickly. Furthermore, starting the micro fan 10 will further accelerate the airflow, thereby increasing the rotation speed of the impeller 802, which will also increase the heating efficiency and the start-up speed of the gas detector body 1.

[0057] When performing gas detection, the sealing cover 206 on the storage part 2 can be opened first, and then the telescopic member 5 can be pulled. The telescopic member 5 is rotated to the outside of the fixed tube 201 through the steering member 4. Then, the second tube 502 of the corresponding length can be pulled step by step according to the required extension length. Since the first tube 501 and the second tube 502 are made of metal, the first tube 501 and the second tube 502 will not deform when air is drawn in through the telescopic member 5, ensuring the smoothness of gas intake. At the same time, the gas can also block impurities in the airflow through the filter component 7. Furthermore, the multi-stage second tube 502 after storage can also perform step-by-step self-cleaning with the first tube 501, avoiding the adhesion of impurities on the inner and outer walls of the first tube 501 and the second tube 502, and reducing the flow space of the airflow.

[0058] When the impeller 802 on the heating mechanism 8 rotates, it will also drive the output rod 703 to rotate and vibrate synchronously through the transmission rod 801. This will achieve vibration cleaning of the filter screen 704 and prevent the surface of the filter screen 704 from being blocked by dust and other particulate impurities.

[0059] Finally, by opening the drain component 9, the impurities inside the first pipe body 501 can be discharged, thus realizing the convenient handling of impurities inside the first pipe body 501.

[0060] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A portable gas detector, characterized in that, include: The gas detector body (1) is a suction pump type, and the air inlet on the gas detector body (1) is set on the outside for air intake, wherein the air inlet is set on the outside of the gas detector body (1) at an upward position; Storage section (2), which is installed on one side of the air inlet of the gas detector body (1); The suction part (3) is located inside the storage part (2) and is connected to the air inlet of the gas detector body (1) so as to extend to the detection area to absorb the detection gas.

2. The portable gas detector as described in claim 1, characterized in that: The storage part (2) includes a retaining tube (201) fixed to one side of the gas detector body (1). A vent hole (202) is provided on one side of the retaining tube (201) to pass through the air inlet on the gas detector body (1). A storage groove (203) is provided on the surface of the retaining tube (201). The suction part (3) is provided in the inner cavity of the storage groove (203). A positioning groove (204) is provided on the surface of the storage groove (203). A positioning rod (205) is fixedly installed in the inner cavity of the positioning groove (204). A sealing cover (206) is movably installed at one end of the positioning rod (205). A magnetic block (207) is fixedly installed at one end of the sealing cover (206). The retaining tube (201) is made of magnetic metal.

3. The portable gas detector as described in claim 2, characterized in that: The air intake (3) includes a steering component (4) disposed inside the storage groove (203). One end of the steering component (4) is provided with a telescopic component (5) for absorbing gas. A bellows (6) is fixedly installed on the outside of the steering component (4), and one end of the bellows (6) is connected to one end of the vent (202).

4. The portable gas detector as described in claim 3, characterized in that: The steering component (4) includes a steering rod (401) fixed in the inner cavity of the storage groove (203). A steering block (402) is movably installed in the middle of the steering rod (401). Elastic limiting blocks (403) are fixedly installed on both sides of the outer side of the steering block (402). Two limiting grooves (404) are opened on both sides of the inner wall of the storage groove (203) to engage with the corresponding limiting blocks (403). A gas transmission hole (405) is opened on the surface of the steering block (402). One end of the transmission hole (405) is connected to one end of the bellows (6) to transmit gas, and the other end of the transmission hole (405) is connected to one end of the telescopic component (5).

5. The portable gas detector as described in claim 4, characterized in that: The telescopic component (5) includes a first tube (501) threadedly connected to the location of the transmission hole (405) of the steering block (402). The outer surface of the steering block (402) connected to the first tube (501) is wrapped with a first sealing ring (505). The inner cavity of the first tube (501) is provided with multiple levels of second tubes (502). A second sealing ring (503) is fixedly installed at the end of each level of the second tube (502). The inner cavities of the multiple levels of the second tubes (502) are interconnected, and their dimensions gradually decrease from bottom to top. The top of the second tube (502) is provided with a gas absorption guide hole (504).

6. The portable gas detector as described in claim 5, characterized in that: The bottom of the inner cavity of the first tube (501) is provided with a filter assembly (7) for airflow impurities. The bottom of the inner cavity of the first tube (501) is also provided with a heating mechanism (8) for friction heating. The gas detector body (1) is equipped with an electrochemical sensor, a catalytic combustion sensor and a suction pump. The gas detector body (1) is provided with a separate control switch for the suction pump.

7. The portable gas detector as described in claim 6, characterized in that: The filter assembly (7) includes an assembly ring (701) threadedly connected to the inner cavity of the first tube (501). A support frame (702) is fixedly installed in the inner cavity of the assembly ring (701). An output rod (703) is movably installed in the middle of the support frame (702) via a bearing. A conical filter screen (704) is fixedly installed at one end of the output rod (703). A drain device (9) is provided on the outer wall of the first tube (501) at the location of the filter screen (704). The other end of the output rod (703) is installed on the outside of the heating mechanism (8).

8. The portable gas detector as described in claim 7, characterized in that: The sewage discharge component (9) includes a cleaning groove (901) formed on the surface of the first pipe body (501). A sealing door (902) is connected to the side wall of the cleaning groove (901). A latch (903) is provided between the sealing door (902) and the outer wall of the first pipe body (501).

9. The portable gas detector as described in claim 7, characterized in that: The heating mechanism (8) includes a transmission rod (801) fixed on the output rod (703). An impeller (802) is fixedly installed at one end of the transmission rod (801). A first heating element (803) is fixedly installed on the surface of the blades of the impeller (802). A second heating element (804) is threadedly connected to the inner cavity of the transmission hole (405) on the steering block (402). The surfaces of the first heating element (803) and the second heating element (804) are in contact with each other.

10. The portable gas detector as described in claim 5, characterized in that: An isolation cover (11) is fixedly installed at one end of the topmost second tube (502) of the multi-stage structure, and a micro fan (10) is fixedly installed inside the cavity of the isolation cover (11).

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