Gas meter shell structure with fire and magnetic interference prevention

Abstract

The application relates to the technical field of gas meter shell, in particular to a gas meter shell structure with fireproof and anti-magnetic interference functions, a valve handle of a switch valve is arranged in a closing assembly, a ring of teeth is arranged outside the valve handle, a hollow plate is fixed outside the shell, a sliding block is slidably connected in a groove of the hollow plate, a first gear rack is arranged at the top of the hollow plate, the first gear rack is fixedly connected with the sliding block, when a fire occurs in the environment where the gas meter is installed, smoke with a high temperature is generated, the temperature of the smoke is higher than the melting temperature of the fusible alloy, then the fusible alloy is melted under the action of the smoke temperature, the elastic potential energy of the first spring cannot be blocked any more, at this time, the first spring is reset to be lengthened and moves in the hollow plate with the sliding block, and then the first gear rack is moved, through the movement of the first gear rack, the valve handle is driven to rotate through the meshing of the teeth, the switch valve is closed through the rotation of the valve handle, and then the gas is actively cut off to improve the safety.

Description

Technical Field

[0001] This invention relates to the field of gas meter housing technology, and in particular to a fire-resistant gas meter housing structure, falling under the category of electrical equipment housing structure design. Specifically, it relates to a gas meter housing with fire protection and anti-magnetic interference functions, and its linkage protection mechanism. Background Technology

[0002] Modern gas meters have evolved into electrical devices integrating electronic metering, data transmission, and control functions. Internally, they are equipped with core electrical components such as electronic sensors, signal processing circuit boards, display modules, and communication units. They require a power supply to achieve intelligent functions such as accurate metering, data storage, remote meter reading, and safe disconnection. Existing technologies effectively suppress interference from external magnetic fields on metering accuracy and system operation through various means, including employing a dual-sensor bridge design, adding electromagnetic shielding, using antimagnetic materials, incorporating magnetic induction elements, and implementing filtering compensation algorithms.

[0003] A search revealed that patent CN115988829A proposes a multi-functional IoT gas meter. While it addresses the issue of electronic component damage caused by high temperatures through heat extraction, chemical cooling, and alarm mechanisms, its casing structure fails to effectively protect internal electronic components from damage caused by external fires. Especially in complex scenarios like older kitchens, the casing cannot withstand the burning of the gas meter by kitchen fires caused by faulty circuits, thus failing to meet the fire protection requirements of older gas meter casings for internal electronic components. Furthermore, it only focuses on cooling and alarm responses, neglecting the prevention of chain risks following a fire (such as actively cutting off the gas supply), and thus cannot effectively protect the gas meter from external fire damage. Therefore, this invention proposes a gas meter casing structure with multi-level protection, including active gas cut-off, automatic cooling, and heat insulation and fire resistance. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies, such as the inability to withstand the burning of gas meters by kitchen fires caused by faulty old circuits, which fails to meet the fire protection requirements of old gas meters. Furthermore, these technologies only focus on cooling and alarm responses and do not address the chain reaction risk prevention and control after a fire causes a safety accident. Therefore, this invention proposes a gas meter casing structure that is both fireproof and resistant to magnetic interference.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a gas meter housing structure with fire resistance and anti-magnetic interference properties, comprising: a gas meter and an inlet pipe, one end of which is connected to the gas inlet of the gas meter. A switch valve is installed on the inlet pipe. A primary protection structure is provided on the exterior of the gas meter. The primary protection structure includes a housing located outside the gas meter, with the gas meter slidably disposed inside the housing. A closing component is linked to the primary protection structure. The closing component includes a valve handle with a switch valve, the valve handle having a ring of teeth on its outside, a hollow plate fixed to the outside of the housing, a slider slidably connected in the groove of the hollow plate, a first rack on the top of the hollow plate, the first rack being fixedly connected to the slider, a fusible alloy and a compressed first spring being disposed in the groove of the hollow plate, the fusible alloy and the first spring being located at both ends of the slider, and the first rack engaging with the teeth.

[0006] As a further embodiment of the present invention, the primary protection structure also includes a hollow box fixedly disposed at the top of the inner cavity of the outer shell. The front of the hollow box can be opened, and a thickened water-filled balloon is placed inside the hollow box. A pad is fixed to the inner wall of the outer shell. A gear is rotatably connected to the top of the pad and a second rack is slidably connected to it. A tie rod is fixed to one end of the second rack, and one end of the tie rod extends into the interior of the hollow box and is located at the position of the water-filled balloon.

[0007] As a further embodiment of the present invention, the primary protection structure also includes a hollowed-out water tank in the outer shell wall, and a drain pipe is slidably connected to the hollow box, with one end of the drain pipe inserted into the interior of the water tank.

[0008] As a further embodiment of the present invention, the top of the outer shell is fixed with an openable rectangular box, the inside of which is provided with a hollow cavity for storing ammonium chloride granules, and the bottom of the rectangular box is provided with a discharge port that communicates with a water tank. The inside of the discharge port is rotatably connected to a baffle via a damping shaft.

[0009] As a further embodiment of the present invention, a floating plate is slidably connected inside the water tank in the vertical direction, and a top rod is fixed to the top of the floating plate.

[0010] As a further embodiment of the present invention, the top of the outer shell is provided with a secondary protective structure, and a storage box is fixed to the top of the outer shell by a rectangular box. The storage box is used to store vermiculite particles, and a discharge trough is provided at the bottom of the storage box. The discharge trough is sealed by a thickened linear sealing balloon.

[0011] As a further embodiment of the present invention, the secondary protection structure also includes a hollow push plate that can slide through the storage box. Two springs are fixed on both sides inside the hollow push plate. A second tie rod is fixed to the bottom of the second spring. An extension rod is fixed to the second tie rod. An insert block is fixed to the extension rod.

[0012] As a further embodiment of the present invention, a connecting rod is fixed to the top of the first rack, one end of the connecting rod is located inside the storage box and fixed with a horizontal plate, the horizontal plate is provided with an inclined groove, and the bottom of the insert block is located inside the inclined groove.

[0013] As a further embodiment of the present invention, a door panel is hinged to the front of the outer shell, the door panel is provided with a gas flow hole, and hot melt adhesive is provided on the two sides of the door panel and the outer shell.

[0014] The working process of the anti-magnetic interference gas meter casing structure during a fire is as follows: Step 1: When a fire occurs in the environment where the gas meter is installed, the high-temperature flue gas comes into contact with the fusible alloy. The flue gas temperature exceeds the melting threshold of the fusible alloy, and then the fusible alloy melts. The No. 1 spring, which was originally blocked by it and was in a compressed state, loses its resistance and releases its elastic potential energy. Step 2: Spring No. 1 releases its elastic potential energy, causing the slider and rack No. 1 to move. Since rack No. 1 meshes with the teeth on the outside of the valve handle, the movement of rack No. 1 is converted into the rotation of the valve handle, which ultimately closes the valve and cuts off the gas supply to the inlet pipe to avoid the risk of leakage. Step 3: When rack number one moves, it will also drive the gear to rotate. The gear meshes with rack number two, which in turn drives rack number two to move. The first tether at one end of rack number two moves with it and pops the water-filled balloon. The water flowing out is injected into the water tank through the drain pipe. Step 4: As the water volume in the tank increases, the internal floating plate rises under the action of buoyancy. The top rod at the top of the floating plate rises simultaneously. The top rod lifts the baffle in the discharge port, causing it to rotate around the damping shaft to open the discharge port. Then, the ammonium chloride particles in the hollow cavity fall into the water tank to dissolve and lower the water temperature, thus enhancing the protection effect in case of fire. Step 5: When rack number one moves, it drives the horizontal plate in the storage box to move through the connecting rod. The hollow push plate is pushed to move through the cooperation of the inclined groove and the insert block. When the hollow push plate moves to the position of the blocking balloon, spring number two returns to its original position, pushing rod number two to extend and burst the blocking balloon to open the discharge chute. Step Six: Vermiculite falls from the discharge chute inside the storage bin. The high temperature of the fire softens the hot melt adhesive on both sides of the door panel and the outer shell, making it adhesive and sticking the vermiculite to the surface to form a covering layer. Under high temperature, the vermiculite expands to block heat transfer and prevents the spread of flames due to its non-combustible nature. A heat-insulating and fire-resistant layer is formed on the outer shell surface to protect the gas meter, buying time for fire fighting and rescue.

[0015] The gas meter housing structure proposed in this invention, which is fireproof and resistant to magnetic interference, has the following advantages: 1. When a fire occurs in the environment where the gas meter is installed, high-temperature flue gas will be generated first. The temperature of this flue gas is higher than the melting temperature of the fusible alloy. Then, the fusible alloy melts under the influence of the flue gas temperature. Initially, the No. 1 spring and the slider are blocked by the fusible alloy. At this time, the No. 1 spring is compressed and stores elastic potential energy. When the fusible alloy melts and can no longer block the elastic potential energy of the No. 1 spring, the No. 1 spring will return to its original position and stretch, moving the slider inside the hollow plate. This, in turn, moves the No. 1 rack. Through the movement of the No. 1 rack, the meshing teeth drive the valve handle to rotate. The rotation of the valve handle closes the switch valve, thereby actively cutting off the gas supply and improving safety.

[0016] 2. When rack number one moves, it drives the gear to rotate, which in turn drives rack number two to move. Rack number one and rack number two move relative to each other. Then rack number two moves with rod number one, popping the water-filled balloon inside the hollow box. The water inside the balloon is then injected into the water tank through the drain pipe. As the water in the tank gradually increases, the float plate and push rod rise under the action of buoyancy. When the push rod rises, it pushes against the baffle and rotates around the damping shaft, thus opening the discharge port. Then, the ammonium chloride particles in the hollow cavity fall into the water tank and dissolve, lowering the water temperature and cooling the water in the tank. This allows water to be actively injected into the outer casing during a fire. The entire water injection process is fully automated and mechanical, avoiding misjudgments that may occur with electronic components and sensors. The aim is to improve the protection level of the gas meter's outer casing as an electrical device, enabling it to protect the internal precision electrical components in complex fire environments and meeting the fire prevention needs of old gas meters and old kitchens.

[0017] 3. After the fusible alloy melts in the primary protection structure triggered by the fire, the movement of rack number one will sequentially drive the connecting rod and the horizontal plate to move synchronously. Since the insert block extends into the inclined groove of the horizontal plate, during the movement of the horizontal plate, the inclined groove will drive the hollow push plate to move through the insert block. In the initial state, spring number two inside the hollow push plate is in a compressed state. When the hollow push plate moves to the position of the sealing balloon, spring number two resets and pushes rod number two to extend, popping the sealing balloon to open the discharge chute. At the same time, the movement of the hollow push plate will push the vermiculite in the storage box, and then the vermiculite falls from the discharge chute. At this time, the high temperature of the fire softens the hot melt adhesive on both sides of the door panel and the outer shell and produces adhesion. The falling vermiculite is adhered to the surface of the door panel and the outer shell by the hot melt adhesive to form a covering layer. Under high temperature, the vermiculite will expand, eventually forming a heat-insulating and fire-resistant protective layer for the gas meter.

[0018] 4. This invention improves the overall fire protection capability of the gas meter in a fire environment by making structural improvements to the gas meter casing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the outer shell structure proposed in this invention; Figure 2 This is a schematic diagram of the casing and gas meter structure proposed in this invention; Figure 3 This is a schematic diagram of the closing component structure proposed in this invention; Figure 4 The present invention proposes Figure 2 Front view; Figure 5 The present invention proposes Figure 4 Schematic diagram of a partial structure; Figure 6 The present invention proposes Figure 2 Schematic diagram of a partial structure; Figure 7 The present invention proposes Figure 6 Sectional view of the water tank; Figure 8 The present invention proposes Figure 7 Enlarged view of a specific area; Figure 9 This is a schematic diagram of the storage box structure proposed in this invention; Figure 10 This is a schematic diagram of the storage box and sealing balloon structure proposed in this invention; Figure 11 This is a cross-sectional view of the hollow pusher plate proposed in this invention.

[0020] In the picture: 11. Gas meter; 12. Door-to-door management; 13. Switch valve; 2. Primary protection structure; 201. Outer shell; 202. Closing assembly; 2021. Valve handle; 2022. Gear; 2023. Hollow plate; 2024. Slider; 2025. Rack No. 1; 2026. Fusible alloy; 2027. Spring No. 1; 203. Hollow box; 204. Water storage balloon; 205. Pad; 206. Gear; 207. Rack No. 2; 208. Tie rod No. 1; 209. Water tank; 210. Drain pipe; 211. Rectangular box; 212. Discharge port; 213. Damping shaft; 214. Baffle; 215. Float plate; 216. Top rod; 217. Hollow cavity; 3. Secondary protection structure; 301. Storage bin; 302. Discharge chute; 303. Sealing balloon; 304. Hollow push plate; 305. No. 2 spring; 306. No. 2 tie rod; 307. Extension rod; 308. Insert block; 309. Connecting rod; 310. Horizontal plate; 311. Inclined groove; 312. Door panel; 313. Gas flow hole. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be noted that the terms center, up, down, left, right, vertical, horizontal, inner, and outer, indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms first, second, and third are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms installation, connection, link, and setting should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments based on the overall structure of this invention.

[0023] Reference Figure 1-3 A gas meter housing structure with fire resistance and anti-magnetic interference features includes: a gas meter 11 and an inlet pipe 12. One end of the inlet pipe 12 is connected to the gas inlet of the gas meter 11. A switching valve 13 is installed on the inlet pipe 12. A primary protection structure 2 is provided on the outside of the gas meter 11. The primary protection structure 2 includes a housing 201, which is located outside the gas meter 11, and the gas meter 11 is slidably disposed inside the housing 201. The primary protection structure 2 is linked to a closing component 202, which includes a valve handle 2021 provided with the switching valve 13. A ring of teeth 2022 is provided on the outside of the outer shell 201. A hollow plate 2023 is fixed on the outside of the outer shell 201. A slider 2024 is slidably connected in the groove of the hollow plate 2023. A first rack 2025 is provided on the top of the hollow plate 2023. The first rack 2025 is fixedly connected to the slider 2024. A fusible alloy 2026 and a compressed first spring 2027 are provided in the groove of the hollow plate 2023. The fusible alloy 2026 and the first spring 2027 are located at both ends of the slider 2024. The first rack 2025 meshes with the teeth 2022.

[0024] The working principle is as follows: When a fire occurs in the environment where the gas meter 11 is installed, high-temperature flue gas will be generated first. The temperature of the flue gas is higher than the melting temperature of the fusible alloy 2026. Then, the fusible alloy 2026 melts under the action of the flue gas temperature. Initially, the first spring 2027 and the slider 2024 are blocked by the fusible alloy 2026. At this time, the first spring 2027 is compressed and stores elastic potential energy. When the fusible alloy 2026 melts and can no longer block the elastic potential energy of the first spring 2027, the first spring 2027 will reset and stretch, moving the slider 2024 in the hollow plate 2023, and then moving the first rack 2025. Then, through the movement of the first rack 2025, the valve handle 2021 is rotated by the meshing teeth 2022. The rotation of the valve handle 2021 closes the switch valve 13, thereby actively cutting off the gas supply and improving safety.

[0025] Reference Figure 4-8 The primary protection structure 2 also includes a hollow box 203 fixedly installed at the top of the inner cavity of the outer shell 201. The front of the hollow box 203 can be opened. A thickened water-filled balloon 204 is placed inside the hollow box 203. A pad 205 is fixed to the inner wall of the outer shell 201. A gear 206 is rotatably connected to the top of the pad 205 and a second rack 207 is slidably connected to it. A first tie rod 208 is fixed to one end of the second rack 207. One end of the first tie rod 208 extends into the interior of the hollow box 203 and is located at the position of the water-filled balloon 204.

[0026] Next, the primary protection structure 2 also includes a hollowed-out water tank 209 in the shell wall of the outer casing 201. A drain pipe 210 is slidably connected to the hollow box 203. One end of the drain pipe 210 is inserted into the interior of the water tank 209. An openable rectangular box 211 is fixed to the top of the outer casing 201. A hollow cavity 217 is provided inside the rectangular box 211 for storing ammonium chloride granules. A discharge port 212 is provided at the bottom of the rectangular box 211 and communicates with the water tank 209. A baffle 214 is rotatably connected inside the discharge port 212 through a damping shaft 213. A floating plate 215 is slidably connected to the interior of the water tank 209 in the vertical direction. A top rod 216 is fixed to the top of the floating plate 215.

[0027] The working principle is as follows: When rack 2025 moves, it drives gear 206 to rotate, which in turn drives rack 207 to move. Rack 2025 and rack 207 move relative to each other. Then, rack 207 drives rod 208 to pop the water balloon 204 inside the hollow box 203. The water inside the water balloon 204 is then injected into the water tank 209 through drain pipe 210. As the water in the water tank 209 gradually increases, the buoyancy causes the float plate 215 and push rod 216 to rise. When the push rod 216 rises, it pushes against the baffle plate 2. 14 rotates around the damping shaft 213, thereby opening the discharge port 212. Then, the ammonium chloride particles in the hollow cavity 217 fall into the water tank 209 and dissolve, lowering the water temperature and cooling the water in the water tank 209. Then, in the event of a fire, water is actively injected into the outer shell 201. The entire water injection process is carried out in a purely mechanical and automated manner, avoiding misjudgments caused by electronic component sensors (in old environments, there is a lot of dust, which has a greater impact on sensors and is prone to misjudgments). This actively resists the burning of the gas meter 11 by fire caused by old circuit failures, meeting the fire prevention requirements of old gas meters and old kitchens.

[0028] Reference Figure 9-11 The top of the outer shell 201 is provided with a secondary protection structure 3. The top of the outer shell 201 is fixed with a storage box 301 through a rectangular box 211. The storage box 301 is used to store vermiculite particles. The bottom of the storage box 301 is provided with a discharge trough 302. The discharge trough 302 is sealed by a thickened linear sealing balloon 303. The secondary protection structure 3 also includes a hollow push plate 304 that can slide on the storage box 301. The two sides inside the hollow push plate 304 are fixed with a second spring 305. The bottom of the second spring 305 is fixed with a second tie rod 306. The second tie rod 306 is fixed with an extension rod 307. The extension rod 307 is fixed with an insert block 308.

[0029] Furthermore, a connecting rod 309 is fixed to the top of the first rack 2025. One end of the connecting rod 309 is located inside the storage box 301 and is fixed to a horizontal plate 310. The horizontal plate 310 is provided with a slanted groove 311. The slanted groove 311 is located at the top of the horizontal plate 310. The bottom of the insert block 308 is located inside the slanted groove 311. A door panel 312 is hinged to the front of the outer shell 201. The door panel 312 is provided with a gas flow hole 313. Hot melt adhesive is provided on the two sides of the door panel 312 and the outer shell 201. The hot melt adhesive on the door panel 312 avoids the gas flow hole 313. The gas flow hole 313 facilitates the air flow of the gas meter 11. The hot melt adhesive softens at high temperature and becomes adhesive. The hot melt adhesive here is hard at room temperature.

[0030] The working principle is as follows: When rack 2025 moves, it moves connecting rod 309 and horizontal plate 310. Since insert block 308 extends into inclined groove 311, inclined groove 311 moves outside insert block 308 when horizontal plate 310 moves, thus moving hollow push plate 304. Initially, spring 305 inside hollow push plate 304 is compressed. When hollow push plate 304 moves to the position of sealing balloon 303, spring 305 resets, extending rod 306 to burst sealing balloon 303, thereby opening discharge chute 302. Simultaneously, the movement of hollow push plate 304 pushes vermiculite in storage bin 301, thus moving... At the discharge chute 302, the vermiculite falls from the chute 302 due to the inclination of the storage box 301 from the center towards the discharge chute 302. Because the hot melt adhesive on both sides of the door panel 312 and the outer shell 201 softens at high temperatures and becomes adhesive, the falling vermiculite is adhered to the door panel 312 and the outer shell 201 by the hot melt adhesive, forming a cover. Under the high temperature of a fire, the vermiculite expands in volume, forming a lightweight, porous structure. This structure gives the vermiculite excellent heat insulation properties, effectively blocking heat transfer and slowing the rate of temperature rise. Simultaneously, vermiculite itself is non-combustible and will not burn or decompose even under high-temperature flames, thus preventing the spread of flames and forming a protective layer. Through this two-stage protection structure, the gas meter 11 can be protected to the greatest extent in the early stages of a fire, buying valuable buffer time for firefighting and rescue. If the gas meter 11 catches fire, its hazard is far greater than that of other electrical equipment in the kitchen environment; therefore, protecting the gas meter 11 during a fire is extremely important.

[0031] It should be noted that, thanks to its excellent fire protection performance, the gas meter of this patent is not only accurately adapted to the special environment of old kitchens with aging circuits and many fire hazards, but can also be applied to various old residential building kitchens, small restaurant kitchens and other scenarios with similar aging circuit problems.

[0032] The working process of the anti-magnetic interference gas meter casing structure during a fire is as follows: Step 1: When a fire occurs in the installation environment of gas meter 11, the high-temperature flue gas produced comes into contact with fusible alloy 2026. The flue gas temperature exceeds the melting threshold of fusible alloy 2026, and then fusible alloy 2026 melts. The first spring 2027, which was originally blocked by it and was in a compressed state, loses its resistance and releases its elastic potential energy. Step 2: Spring 2027 releases its elastic potential energy, causing slider 2024 and rack 2025 to move. Since rack 2025 meshes with the teeth 2022 on the outside of valve handle 2021, the movement of rack 2025 is converted into the rotation of valve handle 2021, which ultimately closes switch valve 13 to cut off the gas supply to inlet pipe 12 and avoid the risk of leakage. Step 3: When rack 2025 moves, it will also drive gear 206 to rotate. Gear 206 meshes with rack 207, thereby driving rack 207 to move. The first tether 208 at one end of rack 207 moves with it and pops the water balloon 204. The water flowing out is injected into water tank 209 through drain pipe 210. Step 4: As the water volume in the water tank 209 increases, the internal floating plate 215 rises under the action of buoyancy. The top rod 216 at the top of the floating plate 215 rises simultaneously. The top rod 216 lifts the baffle 214 in the discharge port 212, causing it to rotate around the damping shaft 213 to open the discharge port 212. Then, the ammonium chloride particles in the hollow cavity 217 fall into the water tank 209 to dissolve and lower the water temperature, thereby enhancing the protection effect during a fire. Step 5: When rack 2025 moves, it drives the horizontal plate 310 in storage box 301 to move through connecting rod 309. The hollow push plate 304 is pushed to move through the cooperation of inclined groove 311 and insert block 308. When the hollow push plate 304 moves to the position of blocking balloon 303, spring 305 resets and pushes the second tie rod 306 to extend and burst the blocking balloon 303 to open discharge chute 302. Step Six: Vermiculite in storage bin 301 falls from discharge chute 302. The high temperature of the fire softens the hot melt adhesive on both sides of door panel 312 and outer shell 201 and produces adhesion, sticking the vermiculite to the surface to form a covering layer. Under high temperature, vermiculite expands to block heat transfer and prevents the spread of flames due to its non-combustibility, forming a heat-insulating and fire-resistant layer to protect gas meter 11, buying time for fire fighting and rescue.

[0033] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A gas meter housing structure with fire resistance and anti-magnetic interference properties, comprising: A gas meter (11) and an inlet pipe (12) are provided. One end of the inlet pipe (12) is connected to the gas inlet of the gas meter (11). A switch valve (13) is installed on the inlet pipe (12). The gas meter (11) is characterized by having a primary protection structure (2) on its exterior. The primary protection structure (2) includes a housing (201). The housing (201) is located outside the gas meter (11), and the gas meter (11) is slidably disposed inside the housing (201). The primary protection structure (2) is linked to a shut-off component (202). The closing component (202) includes a valve handle (2021) provided by the switching valve (13). A ring of teeth (2022) is provided on the outside of the valve handle (2021). A hollow plate (2023) is fixed on the outside of the outer shell (201). A slider (2024) is slidably connected in the groove of the hollow plate (2023). A rack (2025) is provided on the top of the hollow plate (2023). The rack (2025) is fixedly connected to the slider (2024). A fusible alloy (2026) and a compressed spring (2027) are provided in the groove of the hollow plate (2023). The fusible alloy (2026) and the spring (2027) are located at both ends of the slider (2024). The rack (2025) meshes with the teeth (2022).

2. The gas meter housing structure with fire resistance and anti-magnetic interference as described in claim 1, characterized in that, The primary protection structure (2) also includes a hollow box (203) fixedly installed at the top of the inner cavity of the outer shell (201). The front of the hollow box (203) can be opened. A thickened water-storage balloon (204) is placed inside the hollow box (203). A pad (205) is fixed to the inner wall of the outer shell (201). A gear (206) is rotatably connected to the top of the pad (205) and a second rack (207) is slidably connected to it. A first tie rod (208) is fixed to one end of the second rack (207). One end of the first tie rod (208) extends into the interior of the hollow box (203) and is located at the position of the water-storage balloon (204).

3. The gas meter housing structure with fire resistance and anti-magnetic interference as described in claim 2, characterized in that, The primary protection structure (2) also includes a hollowed-out water tank (209) set in the shell wall of the outer shell (201), and a drain pipe (210) is slidably connected to the hollow box (203), with one end of the drain pipe (210) inserted into the interior of the water tank (209).

4. The gas meter housing structure with fire resistance and anti-magnetic interference as described in claim 1, characterized in that, The top of the outer shell (201) is fixed with an openable rectangular box (211). The rectangular box (211) has a hollow cavity (217) inside, which is used to store ammonium chloride particles. The bottom of the rectangular box (211) is provided with a discharge port (212) that communicates with a water tank (209). The discharge port (212) is rotatably connected to a baffle (214) through a damping shaft (213).

5. The gas meter housing structure with fire resistance and anti-magnetic interference as described in claim 3, characterized in that, The interior of the water tank (209) is slidably connected to a floating plate (215) in the vertical direction, and a top rod (216) is fixed to the top of the floating plate (215).

6. The gas meter housing structure with fire resistance and anti-magnetic interference as described in claim 4, characterized in that, The top of the outer shell (201) is provided with a secondary protection structure (3). The top of the outer shell (201) is fixed with a storage box (301) by a rectangular box (211). The storage box (301) is used to store vermiculite particles. The bottom of the storage box (301) is provided with a discharge trough (302). The discharge trough (302) is sealed by a thickened linear sealing balloon (303).

7. A gas meter housing structure with fire resistance and anti-magnetic interference as described in claim 6, characterized in that, The secondary protection structure (3) also includes a hollow push plate (304) that can slide on the storage box (301). Two springs (305) are fixed on both sides inside the hollow push plate (304). Two tie rods (306) are fixed at the bottom of the two springs (305). An extension rod (307) is fixed on the two tie rods (306). An insert block (308) is fixed on the extension rod (307).

8. A gas meter housing structure with fire resistance and anti-magnetic interference as described in claim 6, characterized in that, A connecting rod (309) is fixed to the top of the first rack (2025), and one end of the connecting rod (309) is located inside the storage box (301) and is fixed with a cross plate (310).

9. A gas meter housing structure with fire resistance and anti-magnetic interference as described in claim 8, characterized in that, The horizontal plate (310) is provided with a sloping groove (311), which is located at the top of the horizontal plate (310).

10. A gas meter housing structure with fire resistance and anti-magnetic interference as described in claim 1, characterized in that, The front of the outer shell (201) is hinged to a door panel (312), and the door panel (312) is provided with a gas flow hole (313).

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