Resin-encapsulated explosion-proof sensor

Abstract

The invention relates to the technical field of explosion-proof sensors, and discloses a resin-encapsulated explosion-proof sensor. The gas-collecting hood upper cover and the gas-collecting hood base are combined to form a cavity, a gas-sensitive detection assembly, an expansion isolation assembly and a secondary quick sealing assembly are sequentially installed in the cavity from top to bottom, and the gas-sensitive detection assembly is used for detecting the hydrogen content in air in real time; according to the expansion isolation assembly, gas is rapidly isolated through physical characteristics in a cavity by rapidly filling an expansion material, and the safe early warning effect is achieved; when the concentration of hydrogen in the gas collecting hood of the sensor exceeds the standard, the expansion material in the liquid bag can be triggered and quickly expands, and as the liquid bag is mounted at a specific position, the expanded material can quickly fill the surrounding space, separate the gas-sensitive detection cavity from the hydrogen and prevent the hydrogen from further diffusion, so that the function of quickly isolating the gas is realized; and the safety early warning effect is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field related to explosion-proof sensors, and more specifically, relates to a resin-potted explosion-proof sensor. Background Art

[0002] As a clean energy source, hydrogen has widespread applications in numerous fields. However, it is flammable and explosive. When hydrogen concentration in air reaches a certain range (commonly known as the explosion limit, typically 4.0% to 75.6% by volume), it can cause a violent explosion when exposed to a fire or energy source, resulting in serious casualties and property damage. However, existing explosion-proof sensors have the following drawbacks: The structural design of the gas hood of the hydrogen explosion-proof sensor in the prior art presents certain safety hazards. When hydrogen enters the gas hood through the air inlet channel on the upper cover of the gas hood, due to the imperfect internal space layout and protective measures, hydrogen is very likely to diffuse into the electronic component installation area and come into contact with electronic components such as gas-sensitive circuit boards and potted circuit boards; during operation, electronic components may generate fire sources or energy sources such as electric sparks and heat. Once hydrogen accumulates near the electronic components and reaches the explosion limit, it will encounter the fire source generated by the electronic components, triggering a violent explosion reaction, causing the gas hood to explode, resulting in serious damage to the sensor itself and the inability to continue normal operation.

[0003] Therefore, in view of this, the existing structure and defects are studied and improved, and a resin-potted explosion-proof sensor is provided to achieve a more practical and valuable purpose. Summary of the Invention

[0004] The present invention provides a resin-potted explosion-proof sensor, which is used to overcome the above-mentioned defects in the prior art.

[0005] The purpose and efficacy of the resin-encapsulated explosion-proof sensor of the present invention are achieved by the following specific technical means: A resin-potted explosion-proof sensor comprises a gas collecting cover upper cover and a gas collecting cover base. The gas collecting cover upper cover and the gas collecting cover base are combined to form a cavity. The gas sensitive detection component, the expansion isolation component and the secondary quick sealing component are installed in the cavity 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 cavity with expansion material in a bursting spray manner, physically isolating the electronic components in the cavity from the hydrogen. The secondary quick-sealing component monitors the movement distance of the expansion isolation component in real time and sprays expansion material a second time to repair the inner cavity, further strengthening the hydrogen isolation effect. The expansion and isolation component includes an expansion gel component, an air pressure drive component and a liquid capsule bag. The air pressure drive component promotes the expansion of the aerogel in the liquid capsule bag to fill the cavity through mechanical transmission and pressure drive, thereby constructing a barrier to isolate hydrogen.

[0006] A further technical solution is that the gas-sensitive detection component includes a gas-sensitive circuit board, which divides the cavity into a gas-sensitive detection cavity and an electronic component installation cavity. A gas-sensitive element is fixedly installed above the gas-sensitive circuit board, and the pins of the gas-sensitive element pass through the gas-sensitive circuit board. A rubber gasket is provided at the penetration portion 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, and a gas-sensitive element wire is connected between the gas-sensitive circuit board and the potting circuit board. Copper pillars are fixedly installed on both sides of the gas-sensitive element wire, and 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.

[0007] A further technical solution is that an embedded installation groove is provided inside the upper cover of the air collecting hood, and an explosion-proof plate is installed at the embedded installation groove near the opening of the upper cover of the air collecting hood. A waterproof and breathable membrane is provided under the explosion-proof plate, and a pressure ring is provided under the waterproof and breathable membrane. The pressure ring realizes the compaction installation of the waterproof and breathable membrane by cooperating with the explosion-proof plate.

[0008] A further technical solution is that the expansion isolation component is also connected between the gas-sensitive circuit board and the potted circuit board, and the expansion isolation component includes an expansion glue component and an air pressure drive component. A gas-sensitive element wire is provided on the outside of the expansion glue component, and the expansion glue component includes an upper fixing column, one end of the upper fixing column is connected to the bottom surface of the gas-sensitive circuit board, and the other end of the upper fixing column is connected to a liquid bag. An annular groove is provided on the potted circuit board, and the annular groove divides the potted 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.

[0009] A further technical solution is that a pneumatic drive assembly is fixedly connected below the expansion glue assembly, and the pneumatic drive assembly includes an upper end plate, a lower fixed column is fixedly connected to the outer side of the upper end plate, and the lower fixed column is connected to the liquid bag, two convex balls are provided on the outer side of the upper end plate, and a spring assembly is fixedly connected below the upper end plate, and the other end of the spring assembly is connected to a front end contact plate, a through hole is provided on the front end contact plate, and an air hood lead assembly is passed through the through hole, and the upper end of the air hood lead assembly is connected to the bottom of the potting circuit board, and the secondary potting assembly is triggered to release and fill the secondary potting liquid, and the potting liquid can flow into the tiny gaps, corners and gaps between the expansion materials not covered by the primary expansion to achieve secondary isolation.

[0010] A further technical solution is that an air intake pipe wall cavity is provided below the electronic component installation cavity, and a large tube side wall and a small tube side wall are provided in the air intake pipe wall cavity. A circular cylinder is provided in the large tube side wall, and the circular cylinder is provided with a threaded groove and a smooth wall. The upper end plate is rotated in the threaded groove, and the convex ball provided on the upper end plate rolls in the threaded groove, and the front end contact plate is in sliding contact with the smooth wall.

[0011] A further technical solution is that a secondary potting component is fixedly installed in the side wall of the small tube, and the secondary potting component includes a potting air inlet hood, a secondary potting liquid cavity is provided in the wall body of the potting air inlet hood, the side wall of the potting air inlet hood is provided with a side nozzle, and the upper opening of the potting air inlet hood is provided with an upper nozzle, and 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 end contact plate.

[0012] According to a further technical solution, the gas hood lead assembly includes a hard sleeve, the other end of which is connected to a plastic-sealed wire clamp, the lower section of which is connected to a soft cable, and the hard sleeve provides a limit for the front contact plate to achieve vertical movement.

[0013] According to a further technical solution, the installation layout of the liquid capsule bag, the lower fixing column and the upper fixing column adopts a triangular configuration design, wherein the side close to the liquid capsule bag forms a pentagonal shape that is wider at the bottom and narrower at the top.

[0014] According to a further technical solution, the expansion material filled inside the liquid capsule bag is aerogel, which is a material with a nanoporous structure, extremely low density and high porosity.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The resin-encapsulated explosion-proof sensor of the present invention is provided with a liquid capsule bag. When the hydrogen concentration in the sensor gas collecting cover exceeds the standard, the expansion material in the liquid capsule bag will be triggered and expand rapidly. Since the liquid capsule bag is installed in a specific position, the expanded material can quickly fill the surrounding space, separating the gas-sensitive detection cavity from the hydrogen and preventing the further diffusion of hydrogen, thereby realizing the function of quickly isolating the gas and achieving the effect of safety warning.

[0016] The resin-encapsulated explosion-proof sensor of this invention utilizes a pneumatic drive assembly to create a twisting explosion of the liquid capsule bag. This method ruptures the liquid capsule bag through rotational torque. Compared to traditional puncture explosion methods, which have a single puncture point and a relatively concentrated spray direction for the expanding material, multi-angle spraying is difficult. Twist-type explosion allows the expanding material in the liquid capsule bag to be ejected at a wider range of angles, more completely filling the sensor cavity and effectively isolating hazardous gases such as hydrogen.

[0017] The resin-potted explosion-proof sensor of the present invention is provided with a secondary potting component. Although the primary expansion can quickly isolate the gas, due to the complexity of the expansion process and the particularity of the cavity structure, it is difficult to avoid problems such as insufficient local filling. The secondary potting component triggers the release and secondary potting liquid. These potting liquids can accurately flow into the tiny gaps, corners and gaps between the expansion materials that are not covered by the primary expansion, perform targeted filling, solve the problems left over from the primary expansion, and further enhance the gas isolation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] The present invention will be further described below with reference to the accompanying drawings and examples.

[0020] Figure 1 This is a schematic diagram of the overall appearance structure of the present invention; Figure 2 It is a schematic diagram of the overall front view structure of the present invention; Figure 3 This is a schematic diagram of the explosion appearance structure of the present invention; Figure 4 This is a schematic diagram of the exploded front view structure of the present invention; Figure 5 This is a schematic diagram of the exploded top-view cross-sectional structure of the present invention; Figure 6 It is a schematic diagram of the overall top cross-sectional structure of the present invention; Figure 7 This is a schematic diagram of the overall appearance of the expansion rubber component and the air pressure drive component of the present invention; Figure 8 A schematic diagram of the appearance structure of the expansion glue component, the pneumatic drive component and the secondary potting component of the present invention; Figure 9 It is a schematic diagram of the top cross-sectional structure of the expansion glue component, the pneumatic drive component and the secondary potting component in the present invention.

[0021] Description of reference numerals: Gas collecting hood upper cover 11, gas collecting hood base 12, gas collecting hood lead assembly 13, explosion-proof disk 15, waterproof breathable membrane 16, pressure ring 17, gas sensor 18, rubber gasket 19, gas sensitive circuit board 20, copper column 21, expansion glue assembly 22, gas sensor wire 23, potting circuit board 24, air pressure drive assembly 25, circular cylinder 26, hard sleeve 27, soft cable 28, plastic-sealed wire clamp 29, secondary potting assembly 30, gas sensitive detection cavity 32, air intake pipe wall cavity 33, electronic component installation cavity 34, upper end fixing column 35, liquid capsule bag 36, upper end plate 37, spring assembly 38, lower fixing column 39, front end contact plate 40, through-hole 41, potting air intake hood 42, side nozzle 43, upper nozzle 44, contact cloth 45, secondary potting liquid cavity 46. DETAILED DESCRIPTION

[0022] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0023] In the description of the present invention, unless otherwise specified, "plurality" means two or more; terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0025] In addition, a fixed connection refers to a connection in which parts or components are fixed without any relative movement; a transmission connection refers to a connection in which mechanical motion or torque is transmitted to another working part through a transmission element; a sliding connection refers to a connection in which two objects are in contact but not fixed, allowing them to slide relative to each other; and a rotational connection refers to a connection in which two objects are in contact but not fixed, allowing them to rotate relative to each other. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0026] As attached Figure 1 To the attached Figure 9 As shown: The present invention provides a resin-potted explosion-proof sensor, comprising a gas collecting cover upper cover 11 and a gas collecting cover base 12. The gas collecting cover upper cover 11 and the gas collecting cover base 12 are combined to form a cavity, and a gas sensitive detection component, an expansion isolation component and a secondary quick sealing component are installed in the cavity 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 cavity with expansion material in a bursting spray manner, physically isolating the electronic components in the cavity from the hydrogen. The secondary quick-sealing component monitors the movement distance of the expansion isolation component in real time and sprays expansion material a second time to repair the inner cavity, further strengthening the hydrogen isolation effect. The expansion isolation component includes an expansion gel component 22, an air pressure drive component 25 and a liquid capsule bag 36. The air pressure drive component 25 cooperates through mechanical transmission and pressure drive to cause the aerogel in the liquid capsule bag 36 to expand and fill the cavity, thereby building a barrier to isolate hydrogen.

[0027] Preferably, refer to the attached Figure 5 To the attached Figure 6 The gas-sensitive detection component includes a gas-sensitive circuit board 20, which divides the cavity into a gas-sensitive detection cavity 32 and an electronic component installation cavity 34. A gas-sensitive element 18 is fixedly installed above the gas-sensitive circuit board 20, and the pins of the gas-sensitive element 18 pass through the gas-sensitive circuit board 20. A rubber gasket 19 is provided at the penetration portion 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, and 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.

[0028] Preferably, refer to the attached Figure 5 To the attached Figure 6 An embedded installation groove is provided inside the upper cover 11 of the gas collecting hood. An explosion-proof plate 15 is installed at the opening of the embedded installation groove near the upper cover 11 of the gas collecting hood. A waterproof breathable membrane 16 is provided below the explosion-proof plate 15. A pressure ring 17 is provided below the waterproof breathable membrane 16. The pressure ring 17 realizes the compaction installation of the waterproof breathable membrane 16 by cooperating with the explosion-proof plate 15.

[0029] Preferably, refer to the attached Figure 5 To the attached Figure 6The expansion isolation component is also connected between the gas-sensitive circuit board 20 and the potting circuit board 24. The expansion isolation component includes an expansion glue component 22 and an air pressure drive component 25. A gas-sensitive element wire 23 is provided on the outside of the expansion glue component 22. The expansion glue component 22 includes an upper fixing column 35. One end of the upper fixing column 35 is connected to the bottom surface of the gas-sensitive circuit board 20, and the other end of the upper fixing column 35 is connected to a liquid bag 36. An annular groove is provided on the potting circuit board 24, and the annular groove 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.

[0030] Preferably, refer to the attached Figure 5 To the attached Figure 7 , an air pressure drive component 25 is fixedly connected to the bottom of the expansion glue component 22, and the air pressure drive component 25 includes an upper end plate 37, and a lower fixed column 39 is fixedly connected to the outer side of the upper end plate 37, and the lower fixed column 39 is connected to the liquid capsule bag 36, and two convex balls are provided on the outer side of the upper end plate 37, and a spring component 38 is fixedly connected to the bottom of the upper end plate 37, and the other end of the spring component 38 is connected to a front contact plate 40, and a through hole 41 is provided on the front contact plate 40, and a gas collecting cover lead component 13 is passed through the through hole 41, and the upper end of the gas collecting cover lead component 13 is connected to the bottom of the potting circuit board 24. The secondary potting component triggers the release of the potting liquid, and the potting liquid can flow into the tiny gaps, corners and gaps between the expansion materials not covered by the primary expansion, thereby achieving secondary isolation.

[0031] Preferably, refer to the attached Figure 5 To the attached Figure 6 An air intake pipe wall cavity 33 is provided below the electronic component installation cavity 34. A large tube side wall and a small tube side wall are provided in the air intake pipe wall cavity 33. A circular cylinder 26 is provided in the large tube side wall. 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 on the upper end plate 37 rolls in the threaded groove. The front end contact plate 40 is in sliding contact with the smooth wall.

[0032] Preferably, refer to the attached Figure 5 and attached Figure 9 A secondary potting assembly 30 is fixedly installed in the side wall of the small tube, and the secondary potting assembly 30 includes a potting air inlet cover 42. A secondary potting liquid chamber 46 is provided in the wall of the potting air inlet cover 42, and a side nozzle 43 is provided on the side wall of the potting air inlet cover 42. An upper nozzle 44 is provided on the upper opening of the potting air inlet cover 42. A contact cloth 45 is connected to the side nozzle 43 and the upper nozzle 44, and one end of the contact cloth 45 is connected to the bottom surface of the front contact plate 40.

[0033] Preferably, refer to the attached Figure 4 The gas collecting hood lead assembly 13 includes a hard sleeve 27, the other end of the hard sleeve 27 is connected with a plastic-sealed wire clamp 29, and the lower section of the plastic-sealed wire clamp 29 is connected with a soft cable 28. The hard sleeve 27 provides a limit for the front contact plate 40 to achieve vertical movement.

[0034] Preferably, refer to the attached Figure 6 The installation layout of the liquid capsule bag 36, the lower fixing column 39 and the upper fixing column 35 adopts a triangular configuration design, wherein the side close to the liquid capsule bag 36 forms a pentagonal shape that is wide at the bottom and narrow at the top.

[0035] Preferably, the expansion material filled in the liquid capsule bag 36 is aerogel, which is a material with a nanoporous structure, extremely low density and high porosity.

[0036] Specific use of the present invention: When using this device, first install the device at the detection bottle mouth of the hydrogen bottle. The gas-sensitive circuit board 20 divides the sensor cavity into a gas-sensitive detection cavity 32 and an electronic component installation cavity 34, and the gas-sensitive element 18 is installed above the gas-sensitive circuit board 20. When air enters the gas-sensitive detection cavity 32 through the gas hood upper cover 11, the gas-sensitive element 18 can detect the hydrogen content in real time. The pins of the gas-sensitive element 18 pass through 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 is connected to the potting circuit board 24 through the gas-sensitive element wire 23, and the copper column 21 increases the distance between the two and strengthens the stability, ensuring the stable transmission of the gas-sensitive detection signal. At the same time, below the secondary potting component 30, that is, at the lower port of the gas hood base 12, resin glue is filled for potting to prevent hydrogen from entering the sensor and affecting the detection accuracy.

[0037] The gas hood upper cover 11 is embedded in the mounting groove, which contains, in order, a blast-proof disk 15, a waterproof breathable membrane 16, and a pressure ring 17. The blast-proof disk 15 ruptures to release pressure when the pressure in the chamber is too high; the waterproof breathable membrane 16 allows air to enter while blocking moisture, protecting the gas sensor 18; and the pressure ring 17 cooperates with the blast-proof disk 15 to compact the waterproof breathable membrane 16. The gas hood lead assembly 13 consists of a hard sleeve 27, a plastic-encapsulated wire clamp 29, and a flexible cable 28. The hard sleeve 27 provides a position limit for the front contact plate 40 and protects the internal wires. The plastic-encapsulated wire clamp 29 secures and organizes the wires. The flexible cable 28 transmits the sensor signal to external equipment.

[0038] As the sensor ages with long-term use, its internal sealing gradually deteriorates. The resin glue at the lower port of the gas hood base 12 is affected by environmental factors, causing its molecular structure to change, and its physical properties such as flexibility and viscosity to decrease, resulting in seal failure. At this time, hydrogen will enter the intake pipe wall cavity 33 through the lower port of the gas hood base 12, increasing the pressure within the cavity. This pressure pushes the front contact plate 40 upward along the vertically arranged hard sleeve 27, thereby pushing the spring assembly 38. Under the force, the spring assembly 38 drives the upper end plate 37 upward. As the protruding balls on the outer side of the upper end plate 37 slide in the threaded groove, the upper end plate 37 rotates. As the upper end plate 37 rotates, it drives the liquid sac bag 36 to rotate via the lower fixed column 39. Five inclined lower fixed columns 39 are evenly distributed in a circular array on the lower surface of the liquid sac bag 36. Near one end of the liquid sac bag 36, they have a gradient shape that is narrow at the top and wide at the bottom. This structure causes the liquid sac bag 36 to twist into a pretzel shape at its center axis during rotation. When the torsional deformation reaches a predetermined tolerance value, the liquid capsule bag 36 will be explosively ejected to quickly fill the electronic component installation cavity 34 .

[0039] As the front contact plate 40 moves upward, the contact cloth 45 is simultaneously pulled, releasing the expanding colloid within the secondary potting liquid chamber 46. Because the inlet pipe wall cavity 33 is a high-pressure environment, gas flows toward the lower-pressure area. The secondary potting assembly 30's injection port is located near the inner wall of the gas hood base 12. This high-pressure gas pushes the expanding colloid through the gap, filling the space left unfilled by the initial expansion of the liquid capsule 36, further ensuring proper sensor operation and environmental safety. When the liquid capsule 36 expands, the gas sensor 18 detects a sensor anomaly, allowing inspection personnel to close the valve and replace the sensor, ensuring safe storage of the hydrogen cylinder.

[0040] The embodiments of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as suited for specific applications.

Claims

1. A resin-encapsulated explosion-proof sensor, comprising a gas collecting hood upper cover (11) and a gas collecting hood base (12), wherein the gas collecting hood upper cover (11) and the gas collecting hood base (12) are combined to form a cavity; Its characteristics are: The cavity is provided with a gas-sensitive detection component, an expansion isolation component and a secondary quick-sealing component installed in sequence 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 cavity with expansion material in a bursting and spraying manner, thereby physically isolating the electronic components in the cavity from the hydrogen. The expansion isolation component includes an expansion gel component (22), an air pressure drive component (25), and a liquid capsule bag (36). The air pressure drive component (25) promotes the expansion of the aerogel in the liquid capsule bag (36) to fill the cavity through mechanical transmission and pressure drive, thereby forming a barrier to isolate hydrogen; The secondary quick-sealing component monitors the movement distance of the expansion isolation component in real time and injects expansion material a second time to repair the inner cavity, further enhancing the hydrogen isolation effect.

2. The resin-potted explosion-proof sensor according to claim 1, characterized in that: 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 installation cavity (34). A gas-sensitive element (18) is fixedly installed above the gas-sensitive circuit board (20), and the pins of the gas-sensitive element (18) pass through the gas-sensitive circuit board (20). A rubber gasket (19) is provided at the penetration portion 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), and 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), and 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).

3. The resin-potted explosion-proof sensor according to claim 2, characterized in that: An embedded installation groove is provided inside the gas collecting hood upper cover (11), and an explosion-proof plate (15) is installed at the embedded installation groove near the opening of the gas collecting hood upper cover (11). A waterproof breathable membrane (16) is provided below the explosion-proof plate (15), and a pressure ring (17) is provided below the waterproof breathable membrane (16).

4. The resin-potted explosion-proof sensor according to claim 3, characterized in that: The expansion isolation component is also connected between the gas-sensitive circuit board (20) and the potting circuit board (24), and the expansion isolation component includes an expansion glue component (22) and an air pressure drive component (25). A gas-sensitive element wire (23) is provided on the outside of the expansion glue component (22). The expansion glue component (22) includes an upper fixing column (35), one end of the upper fixing column (35) is connected to the bottom surface of the gas-sensitive circuit board (20), and the other end of the upper fixing column (35) is connected to a liquid bag (36). An annular groove is provided on the potting circuit board (24), and the annular groove 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.

5. The resin-potted explosion-proof sensor according to claim 4, characterized in that: A pneumatic drive assembly (25) is fixedly connected below the expansion glue assembly (22), and the pneumatic drive assembly (25) includes an upper end plate (37), and a lower fixed column (39) is fixedly connected to the outer side of the upper end plate (37), and the lower fixed column (39) is connected to the liquid sac bag (36). Two convex balls are provided on the outer side of the upper end plate (37), and a spring assembly (38) is fixedly connected below the upper end plate (37). The other end of the spring assembly (38) is connected to a front contact plate (40), and a through hole (41) is provided on the front contact plate (40). A gas hood lead assembly (13) is passed through the through hole (41), and the upper end of the gas hood lead assembly (13) is connected to the bottom of the potting circuit board (24).

6. The resin-potted explosion-proof sensor according to claim 5, characterized in that: An air intake pipe wall cavity (33) is provided below the electronic component installation cavity (34), a large tube side wall and a small tube side wall are provided in the air intake pipe wall cavity (33), a circular cylinder (26) is provided in the large tube side wall, the circular cylinder (26) is provided with a thread groove and a smooth wall, the upper end plate (37) rotates in the thread groove, a convex ball provided on the upper end plate (37) rolls in the thread groove, and the front end contact plate (40) is in sliding contact with the smooth wall.

7. The resin-potted explosion-proof sensor according to claim 6, characterized in that: A secondary potting assembly (30) is fixedly installed in the side wall of the small tube, and the secondary potting assembly (30) includes a potting air inlet cover (42). A secondary potting liquid cavity (46) is provided in the wall of the potting air inlet cover (42). A side nozzle (43) is provided in the side wall of the potting air inlet cover (42). An upper nozzle (44) is provided at the upper opening of the potting air inlet cover (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 potting assembly is triggered to release and inject secondary potting liquid, and the potting liquid can flow into tiny gaps, corners, and gaps between expansion materials that are not covered by the primary expansion to achieve secondary isolation.

8. The resin-potted explosion-proof sensor according to claim 7, characterized in that: The gas collecting hood lead assembly (13) comprises a hard sleeve (27), the other end of the hard 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 soft cable (28).

9. The resin-potted explosion-proof sensor according to claim 8, characterized in that: The installation layout of the liquid capsule bag (36), the lower fixing column (39), and the upper fixing column (35) adopts a triangular configuration design.

10. The resin-potted explosion-proof sensor according to claim 9, characterized in that: The expansion material filled inside the liquid capsule bag (36) is aerogel.

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