A resin-encapsulated explosion-proof sensor

Abstract

This invention relates to the field of explosion-proof sensor technology and discloses a resin-encapsulated explosion-proof sensor. The sensor comprises: a cavity formed by combining the gas collecting hood cover and the gas collecting hood base; a gas-sensitive detection component, an expansion isolation component, and a secondary fast-sealing component sequentially installed from top to bottom within the cavity; the gas-sensitive detection component for real-time detection of hydrogen content in the air; and the expansion isolation component, through rapid filling with expansion material, achieving rapid gas isolation within the cavity via physical properties, thus providing a safe early warning effect. When the hydrogen concentration within the sensor's gas collecting hood exceeds the standard, the expansion material in the liquid bladder is triggered and rapidly expands. Because the liquid bladder is installed in a specific position, the expanded material quickly fills the surrounding space, separating the gas-sensitive detection cavity from the hydrogen and preventing further hydrogen diffusion, thereby achieving the function of rapid gas isolation and providing a safe early warning effect.

Description

Technical Field

[0001] This invention belongs to the technical field of explosion-proof sensors, and more specifically, relates to a resin-encapsulated explosion-proof sensor. Background Technology

[0002] Hydrogen, as a clean energy source, has wide applications in many fields. However, hydrogen is flammable and explosive. When the concentration of hydrogen in the air reaches a certain range (usually known as the explosion limit, typically 4.0% - 75.6% by volume), it will cause a violent explosion when it encounters a source of ignition or energy, resulting in serious casualties and property damage. However, existing explosion-proof sensors have the following drawbacks:

[0003] Existing hydrogen explosion-proof sensors have a safety hazard in their gas collection hood design. When hydrogen enters the gas collection hood through the inlet channel on the top cover, due to inadequate internal space layout and protective measures, the hydrogen is highly likely to diffuse into the area where electronic components are installed, coming into contact with gas-sensitive circuit boards, potted circuit boards, and other electronic components. During operation, these electronic components may generate electrical sparks, heat, or other ignition or energy sources. Once hydrogen accumulates near the electronic components and reaches its explosive limit, it will trigger a violent explosion upon encountering an ignition source generated by the electronic components, causing the gas collection hood to explode. This will severely damage the sensor itself, rendering it unable to continue operating normally.

[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a resin-encapsulated explosion-proof sensor in order to achieve a more practical and valuable purpose. Summary of the Invention

[0005] This invention provides a resin-encapsulated explosion-proof sensor to overcome the aforementioned defects in the prior art.

[0006] The purpose and effect of the resin-encapsulated explosion-proof sensor of the present invention are achieved by the following specific technical means:

[0007] A resin-encapsulated explosion-proof sensor includes a gas collection hood cover and a gas collection hood base. The gas collection hood cover and the gas collection hood base are combined to form a cavity. A gas-sensitive detection component, an expansion isolation component, and a secondary quick-sealing component are installed sequentially from top to bottom in the cavity.

[0008] When the gas-sensitive detection component detects hydrogen leakage in the air in real time, the expansion isolation component immediately fills the expansion material quickly in a bursting spray manner, so as to physically isolate the electronic components in the cavity from the hydrogen. The secondary fast sealing component repairs the inner cavity by monitoring the movement distance of the expansion isolation component in real time and spraying expansion material again.

[0009] The expansion barrier component includes an expansion gel component, a pneumatic drive component, and a liquid bladder. The pneumatic drive component uses mechanical transmission and pressure drive to work together to cause the aerogel inside the liquid bladder to expand and fill the cavity, thus constructing a barrier to isolate hydrogen.

[0010] A further technical solution includes a gas-sensitive detection component comprising a gas-sensitive circuit board that divides the cavity into a gas-sensitive detection cavity and an electronic component mounting cavity. A gas-sensitive element is fixedly mounted on the top of the gas-sensitive circuit board, with pins of the gas-sensitive element penetrating the gas-sensitive circuit board. A rubber gasket is provided at the penetration point between the pins of the gas-sensitive element and the gas-sensitive circuit board. A potting circuit board is provided below the gas-sensitive circuit board. A gas-sensitive element wire is connected between the gas-sensitive circuit board and the potting circuit board. Copper pillars are fixedly mounted on both sides of the gas-sensitive element wire. The copper pillars are used to increase the space between the gas-sensitive circuit board and the potting circuit board and to enhance the stability of the gas-sensitive circuit board and the potting circuit board.

[0011] A further technical solution is provided in which an embedded mounting groove is provided inside the gas collection hood cover, an explosion-proof sheet is installed near the opening of the gas collection hood cover in the embedded mounting groove, a waterproof and breathable membrane is provided below the explosion-proof sheet, and a pressure ring is provided below the waterproof and breathable membrane. The pressure ring cooperates with the explosion-proof sheet to compact and install the waterproof and breathable membrane.

[0012] In a further technical solution, an expansion isolation component is connected between the gas-sensitive circuit board and the potting circuit board. The expansion isolation component includes an expansion adhesive component and a pneumatic drive component. A gas-sensitive element wire is provided on the outside of the expansion adhesive component. The expansion adhesive component includes an upper fixing post. One end of the upper fixing post is connected to the bottom surface of the gas-sensitive circuit board, and the other end of the upper fixing post is connected to a liquid bladder. An annular groove is provided on the potting circuit board, which divides the potting circuit board into a ring and a circular plate. One end of the gas-sensitive element wire is connected to the bottom surface of the gas-sensitive circuit board, and the other end of the gas-sensitive element wire is connected to the circular plate.

[0013] A further technical solution includes a pneumatic drive assembly fixedly connected below the expanding adhesive assembly. The pneumatic drive assembly includes an upper end plate, a lower fixing post fixedly connected to the outer side of the upper end plate, and the lower fixing post connected to the liquid bladder. Two protruding balls are provided on the outer side of the upper end plate. A spring assembly is fixedly connected below the upper end plate. A front contact plate is connected to the other end of the spring assembly. A through hole is provided on the front contact plate. A gas collection hood lead assembly passes through the through hole. The upper end of the gas collection hood lead assembly is connected to the bottom of the potting circuit board. The secondary potting assembly is triggered to release and release the secondary potting liquid. The potting liquid can flow into the tiny gaps, corners, and gaps between the expanding materials that were not covered by the primary expansion to achieve secondary barrier.

[0014] In a further technical solution, an air inlet pipe wall cavity is provided below the electronic component mounting cavity. The air inlet pipe wall cavity is provided with a large pipe sidewall and a small pipe sidewall. A circular cylinder is provided inside the large pipe sidewall. The circular cylinder is provided with a threaded groove and a smooth wall. The upper end plate rotates in the threaded groove, and the convex ball provided on the upper end plate rolls in the threaded groove. The front end contact plate slides in contact with the smooth wall.

[0015] A further technical solution is provided, wherein a secondary filling assembly is fixedly installed inside the side wall of the small tube. The secondary filling assembly includes a filling air inlet hood, a secondary filling liquid chamber is provided inside the wall of the filling air inlet hood, a side nozzle is provided on the side wall of the filling air inlet hood, an upper nozzle is provided at the upper opening of the filling air inlet hood, a contact cloth is connected to the side nozzle and the upper nozzle, and one end of the contact cloth is connected to the bottom surface of the front contact plate.

[0016] In a further technical solution, the gas collection hood lead wire assembly includes a rigid sleeve, and a plastic-sealed wire clamp is connected to the other end of the rigid sleeve. A flexible cable is connected to the lower section of the plastic-sealed wire clamp, and the rigid sleeve provides a limit for the front-end contact plate to achieve vertical movement.

[0017] In a further technical solution, the installation layout of the liquid bladder, the lower fixing post, and the upper fixing post adopts a triangular configuration design, wherein the side closest to the liquid bladder forms a pentagonal shape that is wider at the bottom and narrower at the top.

[0018] A further technical solution is that the internal filling expansion material of the liquid bladder is aerogel, which is a nanoporous material with extremely low density and high porosity.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention discloses a resin-encapsulated explosion-proof sensor with a liquid bladder. When the hydrogen concentration in the sensor's gas collection hood exceeds the standard, the expansion material in the liquid bladder is triggered and expands rapidly. Since the liquid bladder is installed in a specific position, the expanded material can quickly fill the surrounding space, separating the gas-sensitive detection chamber from the hydrogen and preventing the hydrogen from spreading further, thereby achieving the function of quickly isolating the gas and achieving the effect of safety warning.

[0021] This invention discloses a resin-encapsulated explosion-proof sensor. By incorporating a pneumatically driven component, the liquid bladder bursts through rotational torque. In contrast, traditional puncture methods result in a single puncture point and a concentrated spray direction of the expanding material, making multi-angle spraying difficult. The puncture-driven method allows the expanding material within the liquid bladder to be ejected at a wider angle. This more comprehensively fills the sensor's internal cavity, thus more effectively isolating hazardous gases such as hydrogen.

[0022] This invention discloses a resin-encapsulated explosion-proof sensor. By incorporating a secondary encapsulation component, although primary expansion can quickly isolate gas, due to the complexity of the expansion process and the special nature of the cavity structure, it is difficult to avoid problems such as insufficient local filling. The secondary encapsulation component triggers the release of secondary encapsulation liquid. This encapsulation liquid can precisely flow into the tiny gaps, corners, and voids between the expanded materials that were not covered by primary expansion, providing targeted filling and solving the problems left over from primary expansion, thereby further enhancing the gas isolation effect. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the overall front view of the present invention;

[0027] Figure 3 This is a schematic diagram of the exploded appearance structure of the present invention;

[0028] Figure 4 This is a schematic diagram of the exploded front view structure of the present invention;

[0029] Figure 5 This is a schematic diagram of the exploded top cross-sectional structure of the present invention;

[0030] Figure 6 This is a schematic diagram of the overall top cross-sectional structure of the present invention;

[0031] Figure 7 This is a schematic diagram of the overall appearance structure of the expanding adhesive assembly and the pneumatic drive assembly in this invention;

[0032] Figure 8 This is a schematic diagram showing the external structure of the expanding adhesive assembly, the pneumatic drive assembly, and the secondary potting assembly in this invention;

[0033] Figure 9 This is a top cross-sectional view of the expanding adhesive assembly, the pneumatic drive assembly, and the secondary potting assembly in this invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 11. Gas collection hood top cover, 12. Gas collection hood base, 13. Gas collection hood lead wire assembly, 15. Explosion-proof sheet, 16. Waterproof and breathable membrane, 17. Pressure ring, 18. Gas-sensitive element, 19. Rubber gasket, 20. Gas-sensitive circuit board, 21. Copper pillar, 22. Expanding adhesive assembly, 23. Gas-sensitive element wire, 24. Encapsulated circuit board, 25. Pneumatic drive assembly, 26. Circular cylinder, 27. Rigid sleeve, 28. Flexible cable, 29. Plastic-sealed wire clamp, 30. Secondary encapsulation assembly, 32. Gas-sensitive detection chamber, 33. Air inlet pipe wall cavity, 34. Electronic component mounting cavity, 35. Upper fixing post, 36. Liquid bladder bag, 37. Upper end plate, 38. Spring assembly, 39. Lower fixing post, 40. Front contact plate, 41. Through hole, 42. Encapsulated air inlet hood, 43. Side nozzle, 44. Upper nozzle, 45. Contact cloth, 46. Secondary encapsulation liquid chamber. Detailed Implementation

[0036] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0037] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium.

[0039] Furthermore, a fixed connection refers to a connection where parts or components are fixed and there is no relative movement; a transmission connection refers to a connection method that transmits mechanical motion or torque to other working parts through a transmission component; a sliding connection refers to a connection method where two objects are in contact but not fixed, and can slide relative to each other; a rotational connection refers to a connection method where two objects are in contact but not fixed, and can rotate relative to each other. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] As attached Figure 1 To be continued Figure 9 As shown:

[0041] This invention provides a resin-encapsulated explosion-proof sensor, including a gas collection cover 11 and a gas collection base 12. The gas collection cover 11 and the gas collection base 12 are combined to form a cavity. A gas-sensitive detection component, an expansion isolation component, and a secondary quick-sealing component are installed sequentially from top to bottom in the cavity.

[0042] When the gas-sensitive detection component detects hydrogen leakage in the air in real time, the expansion isolation component immediately fills the expansion material quickly in a bursting spray manner, so as to physically isolate the electronic components in the cavity from the hydrogen. The secondary fast sealing component repairs the inner cavity by monitoring the movement distance of the expansion isolation component in real time and spraying expansion material again.

[0043] The expansion barrier component includes an expansion gel component 22, a pneumatic drive component 25, and a liquid bladder 36. The pneumatic drive component 25 uses mechanical transmission and pressure drive to cause the aerogel inside the liquid bladder 36 to expand and fill the cavity, thus constructing a barrier to isolate hydrogen.

[0044] Preferred options are shown in the appendix. Figure 5 To be continued Figure 6 The gas-sensitive detection assembly includes a gas-sensitive circuit board 20, which divides the cavity into a gas-sensitive detection cavity 32 and an electronic component mounting cavity 34. A gas-sensitive element 18 is fixedly installed on the top of the gas-sensitive circuit board 20, and the pins of the gas-sensitive element 18 penetrate the gas-sensitive circuit board 20. A rubber gasket 19 is provided at the penetration point between the pins of the gas-sensitive element 18 and the gas-sensitive circuit board 20. A potting circuit board 24 is provided below the gas-sensitive circuit board 20. A gas-sensitive element wire 23 is connected between the gas-sensitive circuit board 20 and the potting circuit board 24. Copper pillars 21 are fixedly installed on both sides of the gas-sensitive element wire 23. The copper pillars 21 are used to increase the space between the gas-sensitive circuit board 20 and the potting circuit board 24 and to enhance the stability of the gas-sensitive circuit board 20 and the potting circuit board 24.

[0045] Preferred options are shown in the appendix. Figure 5 To be continued Figure 6 The upper cover 11 of the gas collection hood is provided with an embedded mounting groove. An explosion-proof sheet 15 is installed in the embedded mounting groove near the opening of the upper cover 11 of the gas collection hood. A waterproof and breathable membrane 16 is provided below the explosion-proof sheet 15. A pressure ring 17 is provided below the waterproof and breathable membrane 16. The pressure ring 17 cooperates with the explosion-proof sheet 15 to compact and install the waterproof and breathable membrane 16.

[0046] Preferred options are shown in the appendix. Figure 5 To be continued Figure 6The gas-sensitive circuit board 20 and the potting circuit board 24 are further connected by the expansion isolation component. The expansion isolation component includes an expansion adhesive component 22 and a pneumatic drive component 25. The outer side of the expansion adhesive component 22 is provided with a gas-sensitive element wire 23. The expansion adhesive component 22 includes an upper fixing post 35. One end of the upper fixing post 35 is connected to the bottom surface of the gas-sensitive circuit board 20, and the other end of the upper fixing post 35 is connected to a liquid bladder 36. The potting circuit board 24 is provided with an annular groove, which divides the potting circuit board 24 into a ring and a circular plate. One end of the gas-sensitive element wire 23 is connected to the bottom surface of the gas-sensitive circuit board 20, and the other end of the gas-sensitive element wire 23 is connected to the circular plate.

[0047] Preferred options are shown in the appendix. Figure 5 To be continued Figure 7 A pneumatic drive assembly 25 is fixedly connected below the expanding adhesive assembly 22. The pneumatic drive assembly 25 includes an upper end plate 37. A lower fixing post 39 is fixedly connected to the outer side of the upper end plate 37. The lower fixing post 39 is connected to the liquid bladder 36. Two protruding balls are provided on the outer side of the upper end plate 37. A spring assembly 38 is fixedly connected below the upper end plate 37. A front contact plate 40 is connected to the other end of the spring assembly 38. A through hole 41 is provided on the front contact plate 40. A gas collection hood lead wire assembly 13 passes through the through hole 41. The upper end of the gas collection hood lead wire assembly 13 is connected to the bottom of the potting circuit board 24. The secondary potting assembly triggers the release of potting liquid. The potting liquid can flow into the tiny gaps, corners and voids between the expanding materials that were not covered by the primary expansion, thus achieving secondary barrier.

[0048] Preferred options are shown in the appendix. Figure 5 To be continued Figure 6 Below the electronic component mounting cavity 34, there is an air inlet pipe wall cavity 33. The air inlet pipe wall cavity 33 is provided with a large pipe sidewall and a small pipe sidewall. The large pipe sidewall is provided with a circular cylinder 26. The circular cylinder 26 is provided with a threaded groove and a smooth wall. The upper end plate 37 rotates in the threaded groove, and the convex ball provided in the upper end plate 37 rolls in the threaded groove. The front end contact plate 40 slides in contact with the smooth wall.

[0049] Preferred options are shown in the appendix. Figure 5 and appendix Figure 9 A secondary filling assembly 30 is fixedly installed inside the side wall of the small tube. The secondary filling assembly 30 includes a filling air inlet hood 42. A secondary filling liquid chamber 46 is provided inside the wall of the filling air inlet hood 42. A side nozzle 43 is provided on the side wall of the filling air inlet hood 42. An upper nozzle 44 is provided at the upper opening of the filling air inlet hood 42. A contact cloth 45 is connected to the side nozzle 43 and the upper nozzle 44. One end of the contact cloth 45 is connected to the bottom surface of the front contact plate 40.

[0050] Preferred options are shown in the appendix. Figure 4 The gas collection hood lead wire assembly 13 includes a rigid sleeve 27, and a plastic-sealed wire clamp 29 is connected to the other end of the rigid sleeve 27. A flexible cable 28 is connected to the lower section of the plastic-sealed wire clamp 29. The rigid sleeve 27 provides a limit for the front contact plate 40 to achieve vertical movement.

[0051] Preferred options are shown in the appendix. Figure 6 The installation layout of the liquid bag 36, the lower fixing post 39, and the upper fixing post 35 adopts a triangular configuration design, wherein the side closest to the liquid bag 36 forms a pentagonal shape that is wider at the bottom and narrower at the top.

[0052] Preferably, the internal filling expansion material of the liquid bladder 36 is aerogel, which is a nanoporous material with extremely low density and high porosity.

[0053] Specific usage of this invention:

[0054] When using this device, first install it at the detection port of the hydrogen cylinder. The gas-sensitive circuit board 20 divides the sensor cavity into a gas-sensitive detection chamber 32 and an electronic component mounting chamber 34, with the gas-sensitive element 18 mounted above the gas-sensitive circuit board 20. When air enters the gas-sensitive detection chamber 32 through the gas collection hood cover 11, the gas-sensitive element 18 can detect the hydrogen content in real time. The pins of the gas-sensitive element 18 penetrate the gas-sensitive circuit board 20, and the rubber gasket 19 ensures the sealing of the connection between the two. The gas-sensitive circuit board 20 and the potting circuit board 24 are connected by the gas-sensitive element wire 23, and the copper pillar 21 increases the distance between them and strengthens the stability, ensuring stable transmission of the gas-sensitive detection signal. At the same time, below the secondary potting assembly 30, that is, at the lower port of the gas collection hood base 12, resin glue is filled for potting to prevent hydrogen from entering the sensor and affecting the detection accuracy.

[0055] An explosion-proof sheet 15, a waterproof and breathable membrane 16, and a pressure ring 17 are sequentially installed in the mounting groove of the gas collection hood cover 11. The explosion-proof sheet 15 ruptures to release pressure when the internal pressure is too high; the waterproof and breathable membrane 16 allows air to enter while blocking moisture, protecting the gas-sensitive element 18; the pressure ring 17 cooperates with the explosion-proof sheet 15 to compact the waterproof and breathable membrane 16. The gas collection hood lead wire assembly 13 consists of a rigid sleeve 27, a plastic-sealed wire clamp 29, and a flexible cable 28. Among them, the rigid sleeve 27 provides a limit for the front contact plate 40 and protects the internal wires, the plastic-sealed wire clamp 29 is used to fix and organize the wires, and the flexible cable 28 is responsible for transmitting the sensor signal to external devices.

[0056] As sensors age with prolonged use, their internal sealing gradually deteriorates. The resin adhesive at the lower port of the gas collecting hood base 12 is affected by environmental factors, causing changes in its molecular structure and a decrease in physical properties such as flexibility and adhesion, leading to seal failure. At this time, hydrogen gas enters the inlet pipe wall cavity 33 through the lower port of the gas collecting hood base 12, increasing the pressure inside the cavity. This pressure pushes the front contact plate 40 upwards along the vertically arranged rigid sleeve 27, thereby pushing the spring assembly 38. The spring assembly 38, under pressure, drives the upper end plate 37 upwards. Because the convex ball on the outer side of the upper end plate 37 slides within the threaded groove, the upper end plate 37 rotates. When the upper end plate 37 rotates, it drives the liquid bladder 36 to rotate via the lower fixing posts 39. The lower surface of the liquid bladder 36 has five evenly distributed, inclined lower fixing posts 39 arranged in a ring array, with a gradually changing shape near the end of the liquid bladder 36 that is narrower at the top and wider at the bottom. This structure causes the liquid bladder 36 to twist into a spiral shape at its central axis during rotation. When the torsional deformation reaches the predetermined tolerance value, the liquid bladder 36 will explode and quickly fill the electronic component mounting cavity 34.

[0057] As the front contact plate 40 moves upward, the contact cloth 45 is simultaneously pulled, releasing the expanding colloid in the secondary filling liquid chamber 46. Because the inlet pipe wall cavity 33 is a high-pressure environment, gas flows towards the low-pressure area. Since the injection port of the secondary filling assembly 30 is located near the inner wall of the gas collection hood base 12, the high-pressure gas can push the expanding colloid through the gaps, filling the space not fully filled during the initial expansion of the liquid bladder 36, further ensuring normal sensor operation and environmental safety. When the liquid bladder 36 expands, the gas-sensitive element 18 detects a sensor malfunction, allowing personnel to close the valve and replace the sensor, ensuring the safe storage of the hydrogen cylinder.

[0058] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A resin-encapsulated explosion-proof sensor, comprising a gas collection cover (11) and a gas collection base (12), wherein the gas collection cover (11) and the gas collection base (12) are combined to form a cavity inside; characterized in that The cavity is equipped with a gas-sensitive detection component, an expansion isolation component, and a secondary quick-sealing component, which are installed sequentially from top to bottom. When the gas-sensitive detection component detects hydrogen leakage in the air in real time, the expansion isolation component immediately fills the expansion material rapidly in a bursting spray manner, so as to physically isolate the electronic components in the cavity from the hydrogen. The expansion barrier component includes an expansion gel component (22), a pneumatic drive component (25), and a liquid bag (36). The pneumatic drive component (25) promotes the expansion of the aerogel inside the liquid bag (36) to fill the cavity through mechanical transmission and pressure drive, thereby constructing a barrier to isolate hydrogen. The gas-sensitive detection assembly includes a gas-sensitive circuit board (20), which divides the cavity into a gas-sensitive detection cavity (32) and an electronic component mounting cavity (34). A gas-sensitive element (18) is fixedly installed on the top of the gas-sensitive circuit board (20). The pins of the gas-sensitive element (18) penetrate the gas-sensitive circuit board (20). A rubber gasket (19) is provided at the penetration point between the pins of the gas-sensitive element (18) and the gas-sensitive circuit board (20). A potting circuit board (24) is provided below the gas-sensitive circuit board (20). A gas-sensitive element wire (23) is connected between the gas-sensitive circuit board (20) and the potting circuit board (24). Copper pillars (21) are fixedly installed on both sides of the gas-sensitive element wire (23). The copper pillars (21) are used to increase the space between the gas-sensitive circuit board (20) and the potting circuit board (24) and to enhance the stability of the gas-sensitive circuit board (20) and the potting circuit board (24). The gas collection hood cover (11) has an embedded mounting groove inside. An explosion-proof sheet (15) is installed near the opening of the gas collection hood cover (11). A waterproof and breathable membrane (16) is provided below the explosion-proof sheet (15). A pressure ring (17) is provided below the waterproof and breathable membrane (16). The gas-sensitive circuit board (20) and the potting circuit board (24) are also connected by the expansion isolation component. The outer side of the expansion adhesive component (22) is provided with a gas-sensitive element wire (23). The expansion adhesive component (22) includes an upper fixing post (35). One end of the upper fixing post (35) is connected to the bottom surface of the gas-sensitive circuit board (20). The other end of the upper fixing post (35) is connected to a liquid bag (36). The potting circuit board (24) is provided with an annular groove. The annular groove divides the potting circuit board (24) into a ring and a plate. One end of the gas-sensitive element wire (23) is connected to the bottom surface of the gas-sensitive circuit board (20). The other end of the gas-sensitive element wire (23) is connected to the plate. A pneumatic drive assembly (25) is fixedly connected below the expanding adhesive assembly (22). The pneumatic drive assembly (25) includes an upper end plate (37). A lower fixing post (39) is fixedly connected to the outer side of the upper end plate (37). The lower fixing post (39) is connected to the liquid bag (36). Two protruding balls are provided on the outer side of the upper end plate (37). A spring assembly (38) is fixedly connected below the upper end plate (37). A front contact plate (40) is connected to the other end of the spring assembly (38). A through hole (41) is provided on the front contact plate (40). A gas collection hood lead wire assembly (13) is passed through the through hole (41). The upper end of the gas collection hood lead wire assembly (13) is connected to the bottom of the potting circuit board (24). Below the electronic component mounting cavity (34) is an air inlet pipe wall cavity (33), and the air inlet pipe wall cavity (33) is provided with a large pipe side wall and a small pipe side wall. The large pipe side wall is provided with a circular cylinder (26), the circular cylinder (26) is provided with a threaded groove and a smooth wall, the convex ball provided on the upper end plate (37) rolls in the threaded groove, and the front end contact plate (40) slides in contact with the smooth wall. The secondary fast-sealing assembly monitors the movement distance of the expansion isolation assembly in real time and then sprays expansion material to repair the inner cavity, further enhancing the hydrogen isolation effect.

2. A resin potted explosion-proof sensor according to claim 1, characterized in that: A secondary filling assembly (30) is fixedly installed inside the side wall of the small tube. The secondary filling assembly (30) includes a filling air inlet hood (42). A secondary filling liquid chamber (46) is provided inside the wall of the filling air inlet hood (42). A side nozzle (43) is provided on the side wall of the filling air inlet hood (42). An upper nozzle (44) is provided on the upper opening of the filling air inlet hood (42). A contact cloth (45) is connected to the side nozzle (43) and the upper nozzle (44). One end of the contact cloth (45) is connected to the bottom surface of the front contact plate (40). The secondary filling assembly is triggered to release and fill the secondary filling liquid. The filling liquid can flow into the tiny gaps, corners and gaps between the expansion materials that were not covered by the primary expansion to achieve secondary barrier.

3. A resin potted explosion-proof sensor according to claim 2, wherein: The gas collection hood lead wire assembly (13) includes a rigid sleeve (27), and the other end of the rigid sleeve (27) is connected to a plastic-sealed wire clamp (29), and the lower section of the plastic-sealed wire clamp (29) is connected to a flexible cable (28).

4. A resin potted explosion-proof sensor according to claim 3, wherein: The installation layout of the liquid bladder (36), the lower fixing post (39), and the upper fixing post (35) adopts a triangular configuration design.

5. A resin potted explosion-proof sensor according to claim 4, wherein: The internal filling material of the liquid bladder (36) is aerogel.

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