A safety protection electric energy metering box for smart grid

Abstract

This invention relates to the field of metering box shell technology, and discloses a smart grid safety protection power metering box, comprising: a box body, the box body having three installation areas, two anti-theft doors hinged to one side of the box body, a ventilation opening in each installation area, and three vertically arranged outer tubes fixedly installed on one side of the box body, each outer tube communicating with the ventilation opening. This invention uses a drive source to drive gears and an outer gear ring to rotate, thereby driving the cylinder and inner tubes to rotate synchronously, achieving precise switching of the inner tube's working position. In normal operation, the ventilation duct ensures ventilation and heat dissipation throughout the chamber, while in fire conditions, the smoke duct is opened, utilizing the chimney effect to achieve directional smoke exhaust from the fire chamber, while simultaneously blocking the air duct to cut off oxygen supply. This solves the contradiction between ventilation and heat dissipation and fire protection isolation in traditional metering boxes, balancing the stability of daily operation and emergency fire protection.

Description

Technical Field

[0001] This invention relates to the field of metering box housing technology, and specifically to a safety protection power metering box for smart grids. Background Technology

[0002] Generally speaking, the safety protection power metering box for smart grids is the core equipment for power grid terminal metering and distribution. In order to adapt to the zonal control requirements of power incoming lines, metering and outgoing lines, the industry generally adopts a three-chamber independent partition structure design, dividing the inside of the box into an incoming line isolation area, a metering core area and an outgoing line control area. The internal components of the metering box generate a large amount of heat during long-term operation. To avoid heat accumulation, aging, condensation, and short circuits, ventilation channels need to be opened in each chamber to allow air circulation between the inside and outside. In actual operation and maintenance, chamber ventilation is a key means to ensure heat dissipation of the equipment, which directly affects the metering accuracy and the service life of the components. However, the ventilation structure of the existing three-chamber metering box has a fatal flaw. The ventilation channels of each chamber are interconnected and there is no independent isolation design. Once a circuit failure in any chamber causes a fire, high-temperature smoke and open flames will quickly enter the other normal chambers through the ventilation channels. This will not only burn the core metering components and cause the loss of metering data, but also cause the fire to spread rapidly and even cause the box to explode and ignite the surrounding wiring facilities. At the same time, the cross-flow of smoke will pollute the entire interior of the box, aggravate the damage to the equipment, increase the difficulty of emergency repair, and make it impossible to achieve fire isolation, which seriously threatens the safety of power grid operation. Based on this, the present invention purposefully provides a smart grid safety protection power metering box that can block the cross-flow of smoke between chambers and take into account both daily ventilation and fire isolation. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a safety protection power metering box for smart grids, thereby solving the technical problems in the prior art.

[0004] The objective of this invention can be achieved through the following technical solutions: A smart grid safety protection power metering box includes: The enclosure has three installation areas. Two security doors are hinged to one side of the enclosure. Each installation area has a ventilation opening. Three vertically arranged outer tubes are fixedly installed on one side of the enclosure. Each outer tube is connected to a ventilation opening. A cylinder is installed above each outer tube. A drive assembly is installed on the cylinder. An inner tube is rotatably installed at the bottom of the cylinder. The inner tube is located inside the outer tube. Two inner tubes are connected through the cylinder. There is an air duct between the inner wall of the outer tube and the outer surface of the inner tube. Multiple inner tubes and multiple cylinders are connected to form a flue. The flue is connected to the ventilation opening. When the drive assembly drives the inner tube to rotate so that the inner tube is connected to the ventilation opening, the inner tube blocks the ventilation opening and the flue.

[0005] As a further embodiment of the present invention: the driving component includes an external gear ring and a gear. The external gear ring is sleeved on the top end of the outer circular surface of the cylinder and is fixedly connected to the cylinder. The gear is rotatably mounted on the outer circular surface of the cylinder and meshes with the external gear ring. The gear is driven to rotate by a driving source built into the cylinder.

[0006] As a further aspect of the present invention, there is a gap between two adjacent outer tubes.

[0007] As a further embodiment of the present invention: the length of the outer tube is the same as the length of the inner tube, and an extension tube is fixedly connected to the top of the cylinder with the highest horizontal height, and the flue is connected to the extension tube.

[0008] As a further embodiment of the present invention: a top cover is slidably sleeved on the outer circular surface of the extension tube, and a sleeve is fixedly installed at the top of the outer tube with the highest horizontal height. The cylinder is located inside the sleeve and the sleeve is connected to the air duct. A sealing ring is slidably sleeved on the outer circular surface of each outer tube. A bottom plate is fixedly installed on one side of the box body. The bottom plate is located directly below the outer tube and the inner tube. The top cover is fixedly connected to the sealing ring through a connecting rod. The top cover is driven to rise and fall by a linkage component. When the flue gas passes through the extension tube, the linkage component drives the top cover to fall, so that the top cover seals the top of the air duct, the sealing ring seals the gap between the two outer tubes, and the sealing ring abuts against the bottom plate, so that the bottom of the air duct is sealed.

[0009] As a further embodiment of the present invention: the linkage assembly includes a spring, a triangular block, a bevel, a heat-conducting tube, a sliding rod, and a roller. Two symmetrically arranged sealing rings are fixedly installed on the outer circumference of the sleeve, and the sealing rings are connected to the bottom of the top cover through the spring. The preload of the spring causes the top cover to rise away from the sleeve. The triangular block is fixedly installed on the top of the top cover. The bevel is opened at the top of the triangular block. The bevel is inclined and the distance between the bevel and the extension tube increases upward along the axial direction. The heat-conducting tube passes through the extension tube and is arranged along the line connecting the two triangular blocks. The heat-conducting tube is fixedly connected to the extension tube. The two sliding rods are slidably installed inside the heat-conducting tube. The roller is set at the bottom end of the sliding rod and is slidably connected to the bevel. A triggering component is provided inside the heat-conducting tube. When the flue gas passes through the extension tube, the triggering component drives the two sliding rods to move away from each other. The roller squeezes the bevel, causing the triangular block and the top cover to descend.

[0010] As a further embodiment of the present invention: the triggering component includes a heat-conducting plate and a bimetallic spring, the heat-conducting plate is fixedly installed inside the heat-conducting tube and is located inside the extension tube, the two bimetallic springs are respectively fixedly installed at both ends of the heat-conducting plate, and the other end of each bimetallic spring is connected to a slide rod.

[0011] As a further embodiment of the present invention: the roller is rotatably mounted on the bottom end of the slide bar, and the roller is in rolling cooperation with the inclined side.

[0012] The beneficial effects of this invention are: 1. In this invention, the drive source drives the gear and external gear ring to rotate, thereby driving the cylinder and inner tube to rotate synchronously, realizing precise switching of the inner tube's working position. In normal working conditions, the ventilation duct ensures ventilation and heat dissipation of the entire chamber. In fire conditions, the smoke duct is opened, and the chimney effect is used to realize directional smoke exhaust from the fire chamber. At the same time, the air duct is blocked to cut off the oxygen supply, solving the contradiction that traditional metering boxes cannot simultaneously achieve ventilation and heat dissipation and fire protection isolation, and balancing the stability of daily operation of the equipment with fire emergency protection.

[0013] 2. In this invention, a passive triggering component is formed by a heat-conducting sheet and a bimetallic spring. No external power supply, electronic control components and manual intervention are required. The linkage component can be triggered by the high temperature of the fire and the smoke. It is suitable for various metering box installation scenarios without external power supply. It has strong operational stability and low failure rate, completely avoids the problem of fire prevention failure caused by electronic control failure, and improves the environmental adaptability and reliability of the fire prevention mechanism.

[0014] 3. In this invention, the linkage component can drive the top cover and sealing ring to move synchronously. When a fire occurs, the upper and lower ports of the air duct and the gap between the adjacent outer pipe are sealed simultaneously, realizing the complete sealing and isolation of the air duct. This can not only cut off the supply of external oxygen to the fire chamber, but also prevent the fire and high-temperature smoke from spreading to other safe installation areas through the air duct, effectively curbing the expansion of danger and maximizing the protection of the core metering device and the safety of the box structure. Attached Figure Description

[0015] The invention will now be further described with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the box in this invention; Figure 3 In this invention Figure 1 Enlarged structural diagram of section A; Figure 4 This is a schematic diagram of the cross-sectional view of the outer tube in this invention; Figure 5 In this invention Figure 2 Enlarged structural diagram of section B; Figure 6 This is a schematic diagram of the misaligned structure of the flue and ventilation opening in this invention; Figure 7 This is a schematic diagram of the alignment of the flue and the ventilation opening in this invention; Figure 8 This is a schematic diagram of the inner tube structure in this invention; Figure 9 In this invention Figure 8 Enlarged structural diagram of section C; Figure 10 This is a cross-sectional structural schematic diagram of the sleeve in this invention; Figure 11 In this invention Figure 10 Enlarged structural diagram of section D.

[0017] In the diagram: 1. Housing; 2. Security door; 3. Installation area; 4. Ventilation opening; 5. Outer pipe; 6. Inner pipe; 7. Air duct; 8. Flue; 9. Cylinder; 10. External gear ring; 11. Gear; 12. Extension pipe; 13. Sleeve; 14. Base plate; 15. Top cover; 16. Sealing ring; 17. Spring; 18. Triangular block; 19. Hydrate; 20. Heat-conducting insert; 21. Slide rod; 22. Roller; 23. Heat-conducting plate; 24. Bimetallic spring; 25. Connecting rod. Detailed Implementation

[0018] 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.

[0019] Please see Figures 1-11 As shown, the present invention is a safety protection power metering box for smart grids, comprising: The enclosure 1 has three installation areas 3 inside. Two security doors 2 are hinged to one side of the enclosure 1. Each installation area 3 has a ventilation opening 4. Three vertically arranged outer tubes 5 are fixedly installed on one side of the enclosure 1. Each outer tube 5 is connected to the ventilation opening 4. A cylinder 9 is set above each outer tube 5. A driving component is set on the cylinder 9. An inner tube 6 is rotatably installed at the bottom of the cylinder 9. The inner tube 6 is located inside the outer tube 5. Two inner tubes 6 are connected through the cylinder 9. There is a duct 7 between the inner wall of the outer tube 5 and the outer surface of the inner tube 6. Multiple inner tubes 6 and multiple cylinders 9 are connected to form a flue 8. The flue 7 is connected to the ventilation opening 4. When the driving component drives the inner tube 6 to rotate so that the inner tube 6 is connected to the ventilation opening 4, the inner tube 6 blocks the ventilation opening 4 and the flue 7.

[0020] Specifically, the drive assembly includes an external gear ring 10 and a gear 11. The external gear ring 10 is sleeved on the top of the outer circular surface of the cylinder 9 and is fixedly connected to the cylinder 9. The gear 11 is rotatably mounted on the outer circular surface of the cylinder 9 and meshes with the external gear ring 10. The gear 11 is driven to rotate by a drive source built into the cylinder 9.

[0021] In one embodiment, the driving source may be a servo motor, a servo motor or other components, or other mechanisms capable of rotational motion. This embodiment does not impose specific limitations on these components.

[0022] The working principle of this invention is as follows: Three independent installation zones 3 are used for zoned layout, conforming to the functional zoning requirements of power equipment's incoming, metering, and outgoing lines. The three installation zones 3 are arranged vertically in layers, corresponding to the incoming line isolation zone, the metering core zone, and the outgoing line control zone, respectively. This not only conforms to the top-down wiring logic of the incoming power lines, reducing line bending losses, but also achieves zoned protection and access control, avoiding electromagnetic interference and the risk of electricity theft. Under normal operating conditions, ventilation duct 7 provides ventilation and heat dissipation throughout the chamber; in case of fire, it switches to smoke duct 8 for directional smoke exhaust and oxygen isolation, completely solving the technical problems of traditional metering boxes, such as the inability to simultaneously address ventilation and fire prevention, easy fire spread, and heat accumulation and condensation. The specific operating process is as follows: In normal ventilation and heat dissipation operation: The drive component rotates the inner tube 6, causing the inner tube 6 and the vent 4 to be staggered. At this time, the inner tube 6 blocks the passage between the flue 8 and the installation area 3, while the air duct 7 remains unobstructed. Outside air can enter the air duct 7 through the bottom of the outer tube 5 and flow into each installation area 3 through the vent 4, realizing the convection between the air inside the box and the outside, quickly dissipating the heat generated by the operation of the components, balancing the temperature difference and humidity inside and outside the box, preventing heat accumulation aging, condensation and short circuit problems, and ensuring the metering accuracy and equipment operation stability. The gap between adjacent outer tubes 5 can assist air circulation, further improving heat dissipation efficiency, while not compromising the independent protection of each installation area 3. Fire emergency protection mode: When a fire occurs in any installation area 3 and generates high-temperature smoke, the smoke and heat diffuse outward along the ventilation opening 4. At this time, the drive component responds quickly, the drive gear 11 rotates and drives the outer gear ring 10, cylinder 9 and inner tube 6 to rotate synchronously, so that the inner tube 6 is directly connected to the ventilation opening 4. The inner tube 6 instantly blocks the passage between the ventilation opening 4 and the air duct 7, cutting off the oxygen supply between the fire chamber and the outside world, while opening the fire chamber and the flue 8. Utilizing the chimney effect of the narrow flue 8, the high-temperature smoke is quickly discharged upward along the flue 8, realizing directional smoke discharge, cooling and depressurization of the fire chamber, preventing smoke from spreading to other safe chambers. At the same time, cutting off the oxygen supply can effectively suppress the spread of the fire and prevent the fire from spreading to key parts such as the metering core area, protecting the core metering devices and data security.

[0023] like Figures 1-9 As shown, in a preferred embodiment of the present invention, there is a gap between two adjacent outer tubes 5.

[0024] In practical application, the gap between adjacent outer pipes 5 provides an auxiliary airflow channel for daily ventilation, forming a complete convection heat dissipation path with the air duct 7. Outside air can enter from the gap and the bottom of the air duct 7, flow through each installation area 3 and then be discharged from the top of the air duct 7, ensuring daily heat dissipation and moisture dissipation. In case of fire, the gap can be sealed to prevent the fire from spreading through the gap and to allow outside oxygen to be supplied to the fire chamber through the gap, thus meeting the dual needs of daily ventilation and emergency fire prevention.

[0025] like Figures 1-10 As shown, in a preferred embodiment of the present invention, the length of the outer tube 5 is the same as the length of the inner tube 6, and the top of the cylinder 9, which has the highest horizontal height, is fixedly connected to an extension tube 12, and the flue 8 is connected to the extension tube 12.

[0026] In practical applications, the extension pipe 12 can effectively lengthen the overall length of the flue 8, enhance the smoke extraction force of the chimney effect, and increase the exhaust speed of high-temperature flue gas. At the same time, the lengthened flue 8 can reduce the probability of external air backflow, prevent oxygen from entering the fire chamber through the flue 8 to aid combustion, further improve the fire suppression effect, and ensure that the flue gas is discharged outside the chamber in a directional and efficient manner.

[0027] like Figures 1-11 As shown, in a preferred embodiment of the present invention, a top cover 15 is slidably sleeved on the outer circular surface of the extension tube 12, and a sleeve 13 is fixedly installed at the top of the outer tube 5 with the highest horizontal height. The cylinder 9 is located inside the sleeve 13, and the sleeve 13 is connected to the air duct 7. A sealing ring 16 is slidably sleeved on the outer circular surface of each outer tube 5. A bottom plate 14 is fixedly installed on one side of the housing 1. The bottom plate 14 is located directly below the outer tube 5 and the inner tube 6. The top cover 15 is fixedly connected to the sealing ring 16 through a connecting rod 25. The top cover 15 is driven to rise and fall by a linkage component. When the flue gas passes through the extension tube 12, the linkage component drives the top cover 15 to fall, so that the top cover 15 blocks the top of the air duct 7, and the sealing ring 16 blocks the gap between the two outer tubes 5. The sealing ring 16 abuts against the bottom plate 14, so that the bottom of the air duct 7 is blocked.

[0028] In practical application, under fire conditions, while the flue 8 is open for smoke exhaust, the linkage component drives the top cover 15 and the sealing ring 16 to move down synchronously, achieving full closure of the air duct 7. This not only prevents external oxygen from entering the fire chamber through the gap between the air duct 7 and the outer pipe 5 to aid combustion, but also blocks the spread of fire and high-temperature smoke through the air duct 7 to other safe installation areas 3, achieving fire zone isolation and preventing small fires from escalating into large-scale fires, minimizing damage to the enclosure 1 and property losses. Under normal operating conditions, the top cover 15 and the sealing ring 16 remain in the upward position, and the gap between the air duct 7 and the outer pipe 5 remains unobstructed, without affecting normal ventilation and heat dissipation.

[0029] like Figures 1-11As shown, in a preferred embodiment of the present invention, the linkage assembly includes a spring 17, a triangular block 18, a bevel 19, a heat-conducting insert 20, a slide rod 21, and a roller 22. Two symmetrically arranged sealing rings 16 are fixedly installed on the outer surface of the sleeve 13, and the sealing rings 16 are connected to the bottom of the top cover 15 through the spring 17. The preload of the spring 17 causes the top cover 15 to rise away from the sleeve 13. The triangular block 18 is fixedly installed on the top of the top cover 15, and the bevel 19 is formed at the top of the triangular block 18. The bevel 19 is arranged at an angle, and the distance between the bevel 19 and the extension tube 12 is... The heat-conducting tube 20 increases upward along the axial direction and passes through the extension tube 12. The heat-conducting tube 20 is arranged along the line connecting the two triangular blocks 18. The heat-conducting tube 20 is fixedly connected to the extension tube 12. The two sliding rods 21 are slidably installed inside the heat-conducting tube 20. The roller 22 is set at the bottom end of the sliding rod 21 and is slidably connected to the inclined side 19. A triggering component is provided inside the heat-conducting tube 20. When the flue gas passes through the extension tube 12, the triggering component drives the two sliding rods 21 to move away from each other. The roller 22 squeezes the inclined side 19, causing the triangular block 18 and the top cover 15 to descend.

[0030] Specifically, the triggering component includes a heat-conducting plate 23 and a bimetallic spring 24. The heat-conducting plate 23 is fixedly installed inside the heat-conducting tube 20 and is located inside the extension tube 12. The two bimetallic springs 24 are respectively fixedly installed at both ends of the heat-conducting plate 23, and the other end of each bimetallic spring 24 is connected to a slide rod 21.

[0031] In practical application, when high-temperature flue gas flows through the extension tube 12, the heat-conducting plate 23 quickly absorbs the heat of the flue gas and transfers it to the bimetallic spring 24. The bimetallic spring 24 undergoes directional expansion and deformation due to heat, pushing the two sliding rods 21 away from each other inside the heat-conducting tube 20. The sliding rods 21 drive the rollers 22 to squeeze the inclined side 19. With the help of the inclined surface to conduct the thrust, the triangular block 18 and the top cover 15 are forced to move downward, the spring 17 is compressed, and the top cover 15 and the sealing ring 16 move downward simultaneously to block the air duct 7. After the fire is extinguished, the temperature inside the extension tube 12 decreases, and the heat-conducting plate 23 and the bimetallic spring 24 gradually cool down and reset. The bimetallic spring 24 contracts and drives the sliding rods 21 and the rollers 22 to reset. The elastic thrust of the spring 17 pushes up the top cover 15 and the sealing ring 16, and the air duct 7 is reopened, restoring the normal ventilation and heat dissipation function, and realizing the automatic switching between emergency protection and normal working conditions.

[0032] like Figures 10-11 As shown, in a preferred embodiment of the present invention, the roller 22 is rotatably mounted on the bottom end of the slide bar 21, and the roller 22 is in rolling engagement with the inclined side 19.

[0033] In practical applications, this embodiment replaces the sliding friction between the slide bar 21 and the triangular block 18 with the rolling friction between the roller 22 and the inclined side 19, which greatly reduces the frictional resistance between the components, avoids jamming, improves the smoothness and response speed of the linkage components, and ensures that the air duct 7 can be quickly blocked when a fire occurs.

[0034] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A safety protection power metering box for smart grids, characterized in that, include: The box (1) has three installation areas (3) inside. Two anti-theft doors (2) are hinged to one side of the box (1). Each installation area (3) has a ventilation opening (4). Three vertically arranged outer tubes (5) are fixedly installed on one side of the box (1). Each outer tube (5) is connected to the ventilation opening (4). A cylinder (9) is set above each outer tube (5). A driving component is set on the cylinder (9). The bottom of the cylinder (9) is rotatably mounted. There is an inner tube (6) located inside the outer tube (5). The two inner tubes (6) are connected by a cylinder (9). There is a duct (7) between the inner wall of the outer tube (5) and the outer surface of the inner tube (6). Multiple inner tubes (6) are connected to multiple cylinders (9) to form a flue (8). The duct (7) is connected to the vent (4). When the driving component drives the inner tube (6) to rotate so that the inner tube (6) is connected to the vent (4), the inner tube (6) blocks the vent (4) and the duct (7).

2. The safety protection electric energy metering box for smart grid according to claim 1, characterized in that, The drive assembly includes an external gear ring (10) and a gear (11). The external gear ring (10) is fitted onto the top of the outer circular surface of the cylinder (9) and is fixedly connected to the cylinder (9). The gear (11) is rotatably mounted on the outer circular surface of the cylinder (9) and meshes with the external gear ring (10). The gear (11) is driven to rotate by a drive source built into the cylinder (9).

3. The security protection electric energy metering box for smart grid according to claim 1, characterized in that, There is a gap between two adjacent outer tubes (5).

4. The safety protection electric energy metering box for smart grid according to claim 1, characterized in that, The length of the outer tube (5) is the same as the length of the inner tube (6), and the top of the cylinder (9) with the highest horizontal height is fixedly connected to the extension tube (12), and the flue (8) is connected to the extension tube (12).

5. The security protection electric energy metering box for smart grid according to claim 4, characterized in that, A top cover (15) is slidably fitted onto the outer circumference of the extension tube (12). A sleeve (13) is fixedly installed at the top of the outer tube (5) with the highest horizontal height. The cylinder (9) is located inside the sleeve (13), and the sleeve (13) is connected to the air duct (7). A sealing ring (16) is slidably fitted onto the outer circumference of each outer tube (5). A bottom plate (14) is fixedly installed on one side of the box body (1). The bottom plate (14) is located between the outer tube (5) and the inner tube (6). Directly below, the top cover (15) is fixedly connected to the sealing ring (16) via the connecting rod (25). The top cover (15) is driven to rise and fall by the linkage component. When the flue gas passes through the extension pipe (12), the linkage component drives the top cover (15) to fall, so that the top cover (15) blocks the top of the air duct (7), the sealing ring (16) blocks the gap between the two outer pipes (5), and the sealing ring (16) abuts against the bottom plate (14), so that the bottom of the air duct (7) is blocked.

6. A smart grid safety protection energy metering box according to claim 5, characterized in that, The linkage assembly includes a spring (17), a triangular block (18), a hypotenuse (19), a heat-conducting tube (20), a slide rod (21), and a roller (22). Two symmetrically arranged sealing rings (16) are fixedly installed on the outer surface of the sleeve (13), and the sealing rings (16) are connected to the bottom of the top cover (15) through the spring (17). The preload of the spring (17) causes the top cover (15) to rise away from the sleeve (13). The triangular block (18) is fixedly installed on the top of the top cover (15), and the hypotenuse (19) is opened on the top of the triangular block (18). The hypotenuse (19) is arranged at an angle, and the distance between the hypotenuse (19) and the extension tube (12) is upward along the axial direction. The heat-conducting tube (20) is installed through the extension tube (12) and along the line connecting the two triangular blocks (18). The heat-conducting tube (20) is fixedly connected to the extension tube (12). The two sliding rods (21) are slidably installed inside the heat-conducting tube (20). The roller (22) is located at the bottom of the sliding rod (21). The roller (22) is slidably connected to the inclined side (19). A triggering component is provided inside the heat-conducting tube (20). When the flue gas passes through the extension tube (12), the triggering component drives the two sliding rods (21) to move away from each other. The roller (22) squeezes the inclined side (19), causing the triangular block (18) and the top cover (15) to descend.

7. The security protection electric energy metering box for smart grid according to claim 6, characterized in that, The triggering component includes a heat-conducting plate (23) and a bimetallic spring (24). The heat-conducting plate (23) is fixedly installed inside the heat-conducting tube (20) and is located inside the extension tube (12). The two bimetallic springs (24) are fixedly installed at both ends of the heat-conducting plate (23), and the other end of each bimetallic spring (24) is connected to a slide rod (21).

8. The security protection electric energy metering box for smart grid according to claim 6, characterized in that, The roller (22) is rotatably mounted on the bottom end of the slide bar (21), and the roller (22) rolls in cooperation with the inclined side (19).

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