An electric energy metering box

Abstract

The application discloses an electric energy metering box, and relates to the technical field of power distribution equipment. The box body cooperates with a box door to enclose a closed cavity. A fire sensing device and an air pressure sensor are integrated in the cavity. Telescopic isolation components are arranged on the box door corresponding to each electrical element. Independent fire extinguishing components and pneumatic driving components are matched. A high-pressure gas source device and a main pipeline assembly are simultaneously carried. When a fire occurs, the closed cavity simultaneously carries out oxygen reduction by air extraction. The high-pressure gas source drives corresponding movable covers to extend, individually covering the electrical element on fire. Then, the independent fire extinguishing components spray fire extinguishing agents at fixed points to achieve single-point accurate fire extinguishing. After the fire is eliminated, the structure automatically resets after pressure relief. The application can block the spread of fire, avoid the influence on the intact electrical circuit, and effectively reduce the loss of electrical fire, thereby improving the safety of power distribution operation and the stability of power supply.

Description

Technical Field

[0001] This invention relates to the field of power distribution equipment technology, specifically to an electricity metering box. Background Technology

[0002] Electricity metering boxes are widely used in residential and industrial power distribution systems. The boxes integrate various electrical components such as circuit breakers, meters, and terminals. Because these devices operate under constant power, they are prone to electrical fires due to issues like line overload, poor contact, and component aging. Electrical fires spread rapidly, and because the components inside are densely packed, a single point of fire can quickly spread to surrounding intact electrical components, causing complete damage to the entire box.

[0003] Currently, most fire prevention and extinguishing structures for electricity metering boxes on the market adopt an overall chamber fire extinguishing and overall oxygen reduction protection mode. This can only extinguish fires in the overall space inside the box and cannot independently isolate and target individual burning components. When a single electrical component inside the box catches fire, the existing protection structure cannot quickly isolate the ignition source, and the fire will still spread rapidly. At the same time, overall fire extinguishing and overall oxygen reduction will affect all normally functioning electrical circuits inside the box, causing large-scale unnecessary power outages and affecting the normal power supply of the area.

[0004] Meanwhile, conventional metering boxes lack independent fire detection mechanisms for individual components, making it impossible to accurately locate single-point fires or provide individual, sealed protection for fire-prone components. This results in extremely poor fire suppression effectiveness, low extinguishing efficiency, and a high risk of reignition, significantly reducing power supply reliability. In summary, existing power metering boxes lack a protection scheme with independent isolation of unit components and precise fire suppression, making it difficult to simultaneously meet the practical needs of rapid fire suppression and uninterrupted power supply to normal circuits. This is a core technical challenge that urgently needs to be addressed in this field. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an electricity metering box.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an electricity metering box, comprising a box body and a box door detachably connected to the box body, wherein a sealing cover is fixedly installed on the inner side of the box door, and the sealing cover, the box door, and the box body cooperate to form a closed cavity; all electrical components are arranged inside the closed cavity, and a pressure sensor is installed inside the closed cavity; a sensing device for detecting fire is provided inside the closed cavity for each electrical component.

[0007] Each electrical component is equipped with a telescopic isolation assembly on the door. Each telescopic isolation assembly includes a fixed cover, a movable cover, and a reset component. The fixed cover is fixed to the door, the movable cover is slidably mounted inside the fixed cover, and the reset component is connected between the door and the movable cover. Under normal conditions, the movable cover is retracted and stored inside the fixed cover. In the event of a fire, the movable cover extends outward and fits against the inner surface of the box, independently covering the corresponding electrical component.

[0008] Each of the telescopic isolation components is equipped with an independent fire extinguishing component and a pneumatic drive component. The pneumatic drive component is connected to the movable cover, and the fire extinguishing component is located inside the movable cover. The power metering box is also equipped with a high-pressure air source device, which is connected to the pipelines of each group of pneumatic drive components through the main pipeline assembly.

[0009] When any sensing device detects a fire in a corresponding electrical component, the enclosed cavity performs a evacuation and oxygen reduction operation, and the pressure sensor monitors the internal pressure of the enclosed cavity in real time. The high-pressure gas source device delivers high-pressure gas to the corresponding pneumatic drive assembly through the main pipeline assembly, driving the movable cover to extend and independently cover the burning electrical component. Subsequently, the corresponding fire extinguishing component starts to spray the extinguishing agent, realizing independent and precise fire extinguishing of a single burning electrical component. After the fire is extinguished, the pneumatic drive assembly depressurizes, and the movable cover retracts and resets under the action of the reset component.

[0010] Preferably, the fire extinguishing assembly includes a fire extinguishing agent storage box, a telescopic pipe, a cavity plate, and nozzles; the fire extinguishing agent storage box is fixedly installed inside the fixed cover, the cavity plate is fixed to the inner surface of the movable cover, and the cavity plate and the movable cover together form a cavity; the fire extinguishing agent storage box and the cavity are connected by multiple telescopic pipes, and a fifth valve for opening and closing the pipeline is installed on the fire extinguishing agent storage box; multiple nozzles are evenly fixed on the cavity plate, and the nozzles are connected to the cavity.

[0011] Preferably, the pneumatic drive assembly includes a piston tube, a piston, a connecting rod, and a fixed frame; the piston tube is fixedly installed inside the fixed cover, and the piston is slidably and sealingly assembled inside the piston tube; the fixed frame is fixed on the inner surface of the movable cover, and the two ends of the connecting rod are fixedly connected to the piston and the fixed frame, respectively; the piston tube is connected to the main pipeline assembly, and high-pressure gas pushes the piston to slide, and drives the movable cover to complete the extension and retraction action through the connecting rod.

[0012] Preferably, the high-pressure air source device includes a suction pump, a connector, an exhaust pipe, a booster tank, and a second connecting pipe; the suction pump is fixedly installed on the top of the enclosed cover, and the exhaust end of the suction pump is fixedly connected to the connector; the connector is connected to the exhaust pipe and the booster tank respectively, a second valve is installed on the exhaust pipe, and a first valve is installed on the pipeline between the connector and the booster tank; the booster tank is connected to the main pipeline assembly through the second connecting pipe.

[0013] Preferably, the main pipeline assembly includes a main pipeline, a third connecting pipe, a connecting pipe, a central head, and a connecting head; the second connecting pipe is fixedly connected to the main pipeline, and adjacent main pipelines are connected to each other through the third connecting pipe; each main pipeline is fixedly connected to multiple connecting pipes, a fourth valve is installed on the connecting pipe, and the end of the connecting pipe away from the main pipeline is fixedly connected to the central head; the central head is fixedly connected to the piston pipe of the claim through the connecting head.

[0014] Preferably, a pressure relief head is fixedly installed on the centralized head, and a pressure relief valve is assembled on the pressure relief head; after the fire is dealt with, the pressure relief valve opens to release the air pressure inside the piston tube, and works with the reset component to achieve the retraction and reset of the movable cover.

[0015] Preferably, the enclosed cavity is equipped with a circulating ventilation duct, which includes an upper pipe, an upper support, a first connecting pipe, a lower pipe, a lower support, and an air inlet pipe; the suction end of the air pump is fixedly connected to the upper pipe through the first connecting pipe, and multiple upper support are fixedly mounted on the upper pipe. The upper support is fixedly connected to the enclosed cover and its bottom end extends into the enclosed cavity; the lower pipe is fixed to the bottom end of the enclosed cover, and multiple lower support are fixedly mounted on the lower pipe. The lower support is fixedly connected to the enclosed cover and its top end extends into the enclosed cavity; the lower pipe is fixedly connected to the air inlet pipe, and the air inlet pipe extends to the outside of the door. The top end of the air inlet pipe has a downward-facing bend, and a third valve is installed on the air inlet pipe.

[0016] Preferably, a protective frame is fixedly installed on the outer side of the box door, and a sealing plate is detachably installed on the protective frame by means of threaded bolts; the main pipe, the central head, the fourth valve, and the pressure relief valve are all arranged in the protective area enclosed by the protective frame and the sealing plate; a breathable filter screen is fixedly installed at the bottom of the protective frame.

[0017] Preferably, a first telescopic rod assembly and a second telescopic rod assembly are provided between the box body and the box door; the first telescopic rod assembly includes a first inner rod and a first sleeve rod, the first sleeve rod is fixed to the inner surface of the box body, and the first inner rod is fixed to the inner side of the box door; the second telescopic rod assembly includes a second inner rod, a second sleeve rod, and a movable block, the second sleeve rod is fixed to the inner surface of the box body, the second inner rod is rotatably connected to the inner side of the box door, and the movable block is fixed to the end of the second inner rod and slidably assembled inside the second sleeve rod; when the box door is opened, the movable block slides along the second sleeve rod, causing the first inner rod and the first sleeve rod to separate from each other.

[0018] Compared with the prior art, the present invention provides an electricity metering box, which has the following beneficial effects:

[0019] 1. Each electrical component inside the enclosure is equipped with an independent telescopic isolation and fire extinguishing structure. If a single component catches fire, it can be quickly enclosed and isolated to prevent the fire from spreading to surrounding intact components. It is equipped with a dedicated fire extinguishing kit to spray extinguishing agent at a specific point. It can effectively extinguish open flames without interfering with the operation of other normal electrical circuits inside the enclosure, minimizing the scope of power outages and equipment damage caused by fire.

[0020] 2. By reducing the oxygen concentration inside the sealed chamber, combustion reactions are suppressed at the source. A pressure sensor monitors the internal pressure in real time to ensure the chamber's airtightness, forming a double-layer fire barrier in conjunction with an independent isolation cover. This significantly improves electrical fire prevention capabilities, effectively avoids the risk of reignition inside the sealed enclosure, and is suitable for the complex operating conditions of outdoor power metering boxes that operate for extended periods.

[0021] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail below with reference to the accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of the box body, box door, protective frame and sealing plate in this invention;

[0024] Figure 2 This is a schematic diagram of the inner side of the protective frame and the box body in this invention;

[0025] Figure 3 This is a schematic diagram of the structure of the box door, the sealing cover, and the telescopic isolation assembly in this invention;

[0026] Figure 4 This is a schematic diagram of the structure of the fixed cover, the movable cover, and the cavity plate in this invention;

[0027] Figure 5 This is a schematic diagram of the structure of the fixed cover, movable cover, piston tube, concentrator head, and main tube in this invention;

[0028] Figure 6 This is a cross-sectional structural diagram of the telescopic isolation component in this invention;

[0029] Figure 7 This is a schematic diagram of the main pipeline assembly and high-pressure air source device in this invention;

[0030] Figure 8This is a schematic diagram of the structure of the lower tube, lower support head, and intake pipe in this invention;

[0031] Figure 9 This is a schematic diagram showing the disassembled structure of the box door, the first inner rod, the first sleeve rod, the second inner rod, and the second sleeve rod in this invention;

[0032] Figure 10 This is a schematic diagram of the disassembled structure of the protective frame and the sealing plate in this invention.

[0033] In the diagram: 1. Box body; 11. Box door; 12. Protective frame; 121. Breathable filter; 13. Sealing plate; 14. Threaded bolt; 15. Enclosure;

[0034] 2. Fixed cover; 21. Movable cover; 211. Fixing frame; 22. Tension spring;

[0035] 3. Cavity plate; 301. Nozzle; 31. Telescopic tube; 311. Fifth valve; 32. Extinguishing agent storage box;

[0036] 4. Air pump; 41. Upper pipe; 411. Upper support; 42. First connecting pipe; 43. Connector; 431. First valve; 44. Exhaust pipe; 441. Second valve; 45. Lower pipe; 451. Lower support; 46. Inlet pipe; 461. Third valve;

[0037] 5. Piston tube; 501. Connecting head; 51. Piston; 52. Connecting rod; 53. Central head; 54. Main pipe; 541. Third connecting pipe; 55. Connecting pipe; 551. Fourth valve; 56. Pressure relief head; 561. Pressure relief valve; 57. Pressure booster tank; 58. Second connecting pipe;

[0038] 6. First inner rod; 61. First sleeve rod; 62. Second inner rod; 621. Movable block; 63. Second sleeve rod. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-10 The principles and features of the present invention are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of the invention. The invention is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the invention.

[0040] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] This invention provides an electricity metering box, including a box body 1 and a door 11. The door 11 is detachably connected to one end of the box body 1 in the width direction. A sealing cover 15 is fixedly installed on the inner side of the door 11. A rubber gasket is fitted at the end of the sealing cover 15, and the rubber gasket fits tightly against the surface of the door 11 to improve the sealing performance. The sealing cover 15, the door 11, and the box body 1 cooperate to form a closed cavity, and all electrical components inside the metering box are arranged inside the closed cavity. A pressure sensor is installed inside the closed cavity to monitor the pressure changes inside the closed cavity in real time. A set of sensors is installed separately for each electrical component inside the closed cavity to collect temperature and smoke signals in real time and accurately determine whether the corresponding electrical component has a fire fault.

[0043] Each electrical component is equipped with a telescopic isolation assembly on the door 11. Each telescopic isolation assembly includes a fixed cover 2, a movable cover 21, and a tension spring 22. The fixed cover 2 is fixedly installed inside the door 11, and the movable cover 21 is slidably installed inside the fixed cover 2, allowing it to move linearly relative to the fixed cover 2. The tension spring 22 is fixedly connected at both ends to the inner wall of the door 11 and the movable cover 21. Under normal conditions, the tension spring 22 is in a contracted state, pulling the movable cover 21 so that most of its structure is retracted inside the fixed cover 2, ensuring normal heat dissipation and ventilation inside the enclosed cavity. When an electrical component catches fire, the movable cover 21 extends outward, and the end of the movable cover 21 is attached to the inner surface of the box 1, sealing the catching electrical component alone inside the movable cover 21, achieving independent isolation of a single catching component and blocking the spread of flames and smoke.

[0044] Piston tube 5 is fixedly installed inside the fixed cover 2. Piston 51 is slidably and sealed inside the piston tube 5. Fixing frame 211 is fixedly installed on the inner surface of the movable cover 21. Connecting rod 52 is fixedly connected between piston 51 and fixing frame 211. When piston 51 slides along piston tube 5 under air pressure, it can synchronously drive movable cover 21 to complete the extension and retraction action through connecting rod 52, thus forming a pneumatic drive assembly.

[0045] Each set of fixed covers 2 is also fixedly installed with an extinguishing agent storage box 32 inside. A cavity plate 3 is fixedly installed on the inner surface of the movable cover 21. The cavity plate 3 and the movable cover 21 enclose each other to form a sealed cavity. Multiple nozzles 301 are evenly fixed on the cavity plate 3, and all nozzles 301 are connected to the cavity. A telescopic pipe 31 connects the extinguishing agent storage box 32 to the cavity. A fifth valve 311 is fixedly installed at the position of the extinguishing agent outlet pipeline of the extinguishing agent storage box 32 to control the opening and closing of the extinguishing agent delivery pipeline. The above structures together constitute the fire extinguishing assembly. In this embodiment, the extinguishing agent storage box 32 is a high-pressure irregular cavity, which is pre-stored with high-pressure liquid heptafluoropropane. After the valve is opened, it can autonomously deliver the extinguishing agent to the cavity by relying on its own stored pressure.

[0046] An air pump 4 is fixedly installed at the top of the sealed cover 15. The air pump 4 is fixedly connected to the first connecting pipe 42 at the air extraction end. The other end of the first connecting pipe 42 is connected to the upper pipe 41. The upper pipe 41 is fixedly connected to multiple upper supports 411. The bottom end of the upper supports 411 passes through the sealed cover 15 and extends into the sealed cavity. A lower pipe 45 is fixedly installed at the bottom of the sealed cover 15. The lower pipe 45 is fixedly connected to multiple lower supports 451. The top end of the lower supports 451 extends into the sealed cavity. The lower pipe 45 is connected to the air inlet pipe 46. The air inlet pipe 46 extends outward to the outside of the box door 11. The top end of the air inlet pipe 46 is provided with a downward bend to prevent rainwater and dust from entering the cavity. A third valve 461 is fixedly installed on the air inlet pipe 46. The upper pipe 41, the first connecting pipe 42, the upper supports 411, the lower pipe 45, the lower supports 451 and the air inlet pipe 46 together form a circulating ventilation pipeline.

[0047] A connector 43 is fixedly installed at the outlet of the air pump 4. The connector 43 is connected to the exhaust pipe 44 and the pressurization tank 57. The exhaust pipe 44 extends to the outside of the door 11, and a second valve 441 is fixedly installed on the exhaust pipe 44. A first valve 431 is fixedly installed on the pipeline between the connector 43 and the pressurization tank 57. The air pump 4, connector 43, and pressurization tank 57 constitute a high-pressure air source device. The pressurization tank 57 is fixedly connected to a second connecting pipe 58, which is connected to a main pipe 54. Adjacent main pipes 54 are interconnected through a third connecting pipe 541. Each main pipe 54 is connected to multiple connecting pipes 55. A fourth valve 551 is fixedly installed on each connecting pipe 55. A concentrator 53 is fixedly installed at the end of each connecting pipe 55. The concentrator 53 is connected to the piston tube 5 through a connector 501. The above pipelines constitute the main pipeline assembly. A pressure relief head 56 is fixedly installed on the concentrator 53, and a pressure relief valve 561 is installed on the pressure relief head 56 for releasing the high-pressure gas inside the piston tube 5 after the fire is extinguished.

[0048] A protective frame 12 is fixedly installed on the outer side of the box door 11. A breathable filter 121 is fixedly installed at the bottom of the protective frame 12. A sealing plate 13 is detachably installed on the protective frame 12 by means of a threaded bolt 14. The main pipe 54, the central head 53, the fourth valve 551, and the pressure relief valve 561 are all housed in the protective space enclosed by the protective frame 12 and the sealing plate 13, thus achieving external protection.

[0049] A first telescopic rod assembly and a second telescopic rod assembly are provided between the box body 1 and the box door 11. The first telescopic rod assembly includes a first inner rod 6 and a first sleeve rod 61. The first sleeve rod 61 is fixed to the inner surface of the box body 1, and the first inner rod 6 is fixed to the inner side of the box door 11. The second telescopic rod assembly includes a second inner rod 62, a second sleeve rod 63, and a movable block 621. The second sleeve rod 63 is fixed to the inner surface of the box body 1. One end of the second inner rod 62 is rotatably connected to the inner side of the box door 11, and the other end of the second inner rod 62 is fixed to the movable block 621. The movable block 621 is slidably assembled inside the second sleeve rod 63. When the box door 11 is opened, the movable block 621 slides along the second sleeve rod 63, causing the first inner rod 6 and the first sleeve rod 61 to separate, thereby limiting the opening and closing of the box door.

[0050] The workflow of this embodiment is as follows: During normal heat dissipation, the third valve 461 and the second valve 441 are open, while the remaining valves are closed. The air pump 4 operates to achieve air convection heat dissipation inside and outside the sealed cavity. During standby energy storage, the second valve 441 is closed and the first valve 431 is opened. The air pump 4 exhausts gas and stores it in the pressurization tank 57 to form a high-pressure gas source. After the sensing device detects a fire, the third valve 461 closes, and the air pump 4 continuously pumps air to create a low-oxygen environment in the sealed cavity to suppress the fire. Correspondingly, the fourth valve 551 opens, and the high-pressure gas pushes the piston 51 to move, causing the movable cover 21 to extend and isolate the ignition element. Subsequently, the fifth valve 311 opens, and heptafluoropropane is autonomously transported to the cavity by the high pressure of the storage box itself and sprayed through the nozzle 301 to extinguish the fire. After the fire is extinguished, the pressure relief valve 561 opens to release pressure, and the movable cover 21 is reset under the action of the tension spring 22, and the equipment returns to normal operation.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. An electricity metering box, comprising a box body (1) and a box door (11) detachably connected to the box body (1), characterized in that: A sealing cover (15) is fixedly installed inside the box door (11). The sealing cover (15), the box door (11), and the box body (1) cooperate to form a closed cavity. All electrical components are arranged inside the closed cavity, and a pressure sensor is installed inside the closed cavity. A sensing device for detecting fire is set inside the closed cavity for each electrical component. Each electrical component is equipped with a telescopic isolation assembly on the door (11). Each telescopic isolation assembly includes a fixed cover (2), a movable cover (21), and a reset component. The fixed cover (2) is fixed to the door (11), the movable cover (21) is slidably mounted on the inside of the fixed cover (2), and the reset component is connected between the door (11) and the movable cover (21). Under normal conditions, the movable cover (21) is retracted and stored inside the fixed cover (2). In the event of a fire, the movable cover (21) extends outward and fits against the inner surface of the box (1) to independently cover the corresponding electrical component. Each of the telescopic isolation components is equipped with an independent fire extinguishing component and a pneumatic drive component. The pneumatic drive component is connected to the movable cover (21) and the fire extinguishing component is installed inside the movable cover (21). The power metering box is also equipped with a high-pressure air source device. The high-pressure air source device is connected to the pipeline of each group of pneumatic drive components through the main pipeline assembly. When any sensing device detects a fire in the corresponding electrical component, the enclosed cavity performs a vacuuming and oxygen reduction operation, and the pressure sensor monitors the internal pressure of the enclosed cavity in real time. The high-pressure gas source device delivers high-pressure gas to the corresponding pneumatic drive assembly through the main pipeline assembly, driving the movable cover (21) to extend and independently cover the burning electrical component. Subsequently, the corresponding fire extinguishing assembly starts to spray the fire extinguishing agent, realizing independent and precise fire extinguishing of a single burning electrical component. After the fire is extinguished, the pneumatic drive assembly depressurizes, and the movable cover (21) retracts and resets under the action of the reset component.

2. The electricity metering box according to claim 1, characterized in that: The fire extinguishing assembly includes a fire extinguishing agent storage box (32), a telescopic pipe (31), a cavity plate (3), and a nozzle (301). The fire extinguishing agent storage box (32) is fixedly installed inside the fixed cover (2), and the cavity plate (3) is fixed on the inner surface of the movable cover (21). The cavity plate (3) and the movable cover (21) together form a cavity. The fire extinguishing agent storage box (32) and the cavity are connected by multiple telescopic pipes (31). A fifth valve (311) for opening and closing the pipeline is installed on the fire extinguishing agent storage box (32). Multiple nozzles (301) are evenly fixed on the cavity plate (3), and the nozzles (301) are connected to the cavity.

3. The electricity metering box according to claim 1, characterized in that: The pneumatic drive assembly includes a piston tube (5), a piston (51), a connecting rod (52), and a fixing frame (211). The piston tube (5) is fixedly installed inside the fixing cover (2), and the piston (51) is slidably and sealed inside the piston tube (5). The fixing frame (211) is fixed on the inner surface of the movable cover (21), and the two ends of the connecting rod (52) are fixedly connected to the piston (51) and the fixing frame (211) respectively. The piston tube (5) is connected to the main pipeline assembly pipeline. High-pressure gas pushes the piston (51) to slide, and drives the movable cover (21) to complete the extension and retraction action through the connecting rod (52).

4. The electricity metering box according to claim 1, characterized in that: The high-pressure air source device includes a vacuum pump (4), a connector (43), an exhaust pipe (44), a booster tank (57), and a second connecting pipe (58). The vacuum pump (4) is fixedly installed on the top of the sealed cover (15), and the exhaust end of the vacuum pump (4) is fixedly connected to the connector (43). The connector (43) is connected to the exhaust pipe (44) and the booster tank (57) respectively. A second valve (441) is installed on the exhaust pipe (44), and a first valve (431) is installed on the pipeline between the connector (43) and the booster tank (57). The booster tank (57) is connected to the main pipeline assembly through the second connecting pipe (58).

5. The electricity metering box according to claim 4, characterized in that: The main pipeline assembly includes a main pipe (54), a third connecting pipe (541), a connecting pipe (55), a central head (53), and a connecting head (501); the second connecting pipe (58) is fixedly connected to the main pipe (54), and two adjacent main pipes (54) are connected to each other through the third connecting pipe (541); each main pipe (54) is fixedly connected to multiple connecting pipes (55), a fourth valve (551) is installed on the connecting pipe (55), and the end of the connecting pipe (55) away from the main pipe (54) is fixedly connected to the central head (53); the central head (53) is fixedly connected to the piston pipe (5) of claim 3 through the connecting head (501).

6. The electricity metering box according to claim 5, characterized in that: A pressure relief head (56) is fixedly installed on the central head (53), and a pressure relief valve (561) is installed on the pressure relief head (56). After the fire is dealt with, the pressure relief valve (561) opens to release the air pressure inside the piston tube (5), and the movable cover (21) is retracted and reset in conjunction with the reset component.

7. The electricity metering box according to claim 4, characterized in that: The enclosed cavity is equipped with a circulating ventilation pipeline, which includes an upper pipe (41), an upper support (411), a first connecting pipe (42), a lower pipe (45), a lower support (451), and an air inlet pipe (46). The suction end of the air pump (4) is fixedly connected to the upper pipe (41) through the first connecting pipe (42). Multiple upper supports (411) are fixed on the upper pipe (41). The upper supports (411) are fixedly connected to the enclosed cover (15) and their bottom ends extend into the enclosed cavity. Inside; the lower tube (45) is fixed to the bottom of the enclosure (15), and multiple lower supports (451) are fixed on the lower tube (45). The lower supports (451) are fixedly connected to the enclosure (15) and their top ends extend into the enclosed cavity. The lower tube (45) is fixedly connected to the air inlet pipe (46). The air inlet pipe (46) extends to the outside of the door (11). The top end of the air inlet pipe (46) is provided with a downward bending part. A third valve (461) is installed on the air inlet pipe (46).

8. The electricity metering box according to claim 5, characterized in that: A protective frame (12) is fixedly installed on the outer side of the box door (11), and a sealing plate (13) is detachably installed on the protective frame (12) by means of a threaded bolt (14); the main pipe (54), the central head (53), the fourth valve (551), and the pressure relief valve (561) are all arranged in the protective area enclosed by the protective frame (12) and the sealing plate (13); a breathable filter screen (121) is fixedly installed at the bottom of the protective frame (12).

9. The electricity metering box according to claim 1, characterized in that: A first telescopic rod group and a second telescopic rod group are provided between the box body (1) and the box door (11); the first telescopic rod group includes a first inner rod (6) and a first sleeve rod (61), the first sleeve rod (61) is fixed on the inner surface of the box body (1), and the first inner rod (6) is fixed on the inner side of the box door (11); the second telescopic rod group includes a second inner rod (62), a second sleeve rod (63) and a movable block (621), the second sleeve rod (63) is fixed on the inner surface of the box body (1), the second inner rod (62) is rotatably connected to the inner side of the box door (11), and the movable block (621) is fixed at the end of the second inner rod (62) and slidably assembled inside the second sleeve rod (63); when the box door (11) is opened, the movable block (621) slides along the second sleeve rod (63), causing the first inner rod (6) and the first sleeve rod (61) to separate from each other.

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