High-safety electric energy metering box

Abstract

This application relates to the technical field of electrical equipment and discloses a highly secure electricity metering box, which includes a box body, an electricity meter and a circuit breaker installed in the box body. The circuit breaker is equipped with a trip coil, and a micro switch is energized to the trip coil. The box body includes a door, a bottom plate, side plates, and a partition plate installed on the side plates. The micro switch includes a housing installed on the partition plate, a stationary contact plate installed on the housing, a moving contact plate installed on the housing, and a trigger block installed on the inner wall of the door. When maintenance personnel open the door, the trigger block moves with the door and separates from the moving contact plate. The moving contact plate rotates and contacts the stationary contact plate, thereby closing the micro switch. After the trip coil is energized, it drives the internal mechanism of the circuit breaker to operate, causing the circuit breaker to automatically trip and disconnect the power. This reduces the safety hazards caused by forgetting to disconnect the circuit breaker and thus improves the safety of the electricity metering box and enhances the safety of the entire smart distribution network.

Description

Technical Field

[0001] This application relates to the technical field of electrical equipment, and in particular to a highly secure power metering box. Background Technology

[0002] An electricity metering box is a complete set of equipment used for electricity metering. It serves as a measurement standard for power supply departments to measure users' electricity consumption. Its core function is to accurately measure the electricity consumed by users and provide a basis for electricity bill settlement. At the same time, it is also a comprehensive device that integrates a variety of electrical equipment. It is widely used in residential buildings, office buildings, shopping malls, and other places, and is an important component of modern smart power distribution networks.

[0003] In related technologies, an electricity metering box includes a box body, electrical components such as an electricity meter installed inside the box, and cables. When it is necessary to open the box for maintenance, the power to the metering box must be disconnected first, that is, the circuit breaker must be turned off, and then the electrical components and the cables connected to the electrical components can be repaired to ensure the safety of maintenance personnel and reduce the risk of electric shock.

[0004] However, if maintenance personnel forget to disconnect the circuit breaker before inspecting the electricity metering box, it will result in live operation, increasing the risk of electric shock, posing a high risk of workplace injury, and reducing the overall safety of the smart distribution network. Therefore, improvements are needed. Summary of the Invention

[0005] To improve safety during the maintenance of electricity metering boxes, this application provides a highly secure electricity metering box.

[0006] The high-security electricity metering box provided in this application adopts the following technical solution: A high-security electricity metering box includes a box body, an electricity meter and a circuit breaker installed in the box body. The circuit breaker is equipped with a trip coil, and a micro switch is electrically connected to the trip coil. The box body includes a door, a bottom plate, a side plate and a partition installed on the side plate. The micro switch includes a housing installed on the partition plate, a stationary contact plate installed on the housing, a moving contact plate installed on the housing, and a trigger block installed on the inner wall of the door. When the door is opened, the trigger block separates from the moving contact plate, and the moving contact plate contacts the stationary contact plate.

[0007] By adopting the above technical solution, the stationary contact of the microswitch is electrically connected to the trip coil in the circuit breaker, and the moving contact is mechanically triggered by a trigger block on the inner wall of the box door. When maintenance personnel open the box door, the trigger block moves with the box door and separates from the moving contact. The moving contact, under its own elastic restoring force or the action of related elastic elements, contacts the stationary contact, thereby closing the microswitch. This causes the power supply circuit of the trip coil to be connected, and the trip coil, after being energized, drives the internal mechanism of the circuit breaker to operate, causing the circuit breaker to automatically trip and disconnect the power. This process is entirely triggered by the opening action, eliminating the need for maintenance personnel to manually operate the circuit breaker. This effectively avoids the safety hazards of live operation due to forgetting to disconnect the circuit breaker, reduces the risk of electric shock, improves the safety of the electricity metering box during maintenance work, and thus enhances the safety of the entire smart distribution network.

[0008] When the box door is closed, the door causes the trigger block to come into contact with the moving contact, causing the other end of the moving contact to separate from the stationary contact. This causes the micro switch to open, disconnecting the power supply circuit of the trip coil, and thus automatically closing the circuit breaker to restore the normal operation of the metering box and ensure the normal operation of the smart grid.

[0009] Optionally, a rotating shaft is rotatably mounted on the housing, the movable contact piece is mounted on the rotating shaft, one end of the movable contact piece is provided with an elastic element, the elastic element is mounted on the housing, the elastic element has a tendency to drive the movable contact piece to move away from the housing, the stationary contact piece is mounted on the side of the rotating shaft away from the elastic element, and when the door is closed, the trigger block abuts against the end of the movable contact piece with the elastic element.

[0010] By adopting the above technical solution, when the box door is closed, the trigger block on the inner wall of the box door abuts against the end of the moving contact with the elastic element, overcoming the elastic force of the elastic element, causing the moving contact to rotate around the rotating shaft to a position separated from the stationary contact, thereby disconnecting the circuit of the trip coil and ensuring that the normal metering operation of the electricity metering box is not affected. When the box door is opened, the trigger block moves with the box door and separates from the moving contact. Under the action of the elastic restoring force of the elastic element, the moving contact rotates around the rotating shaft, causing the other end of the moving contact to contact the stationary contact, realizing the automatic energization of the trip coil. Utilizing lever-type rotation, the moving contact is divided into two lever arms through the rotating shaft. The structure is compact and the action is sensitive and reliable. The elastic element can provide a stable and continuous elastic restoring force, ensuring that the moving contact and the stationary contact can reliably contact each time the door is opened, thereby ensuring the accuracy and reliability of the tripping action.

[0011] Optionally, a protective cover is slidably mounted on the partition. When the box door is opened, the protective cover covers the micro switch. A guide groove is provided on the outer wall of the protective cover, and a guide slope is provided on the groove wall. A push block is provided on the inner wall of the box door. The maximum distance between the push block and the box door is greater than the maximum distance between the trigger block and the box door. When the box door is closed, the push block abuts against the guide slope. The guide slope is used to guide the protective cover to move away from the micro switch.

[0012] By adopting the above technical solution, a protective cover is slidably installed on the partition. When the box door is opened, the protective cover can automatically slide vertically towards the micro switch under its own weight, thus automatically covering the outside of the micro switch. This provides effective physical protection for the micro switch and prevents accidental contact of the moving or stationary contacts of the micro switch by maintenance personnel or tools during maintenance, which could lead to false triggering or electrical short circuits. This further improves the safety of maintenance operations.

[0013] Meanwhile, by creating a guide groove with a guide slope on the outer wall of the protective cover and setting a push block on the inner wall of the cabinet door at a distance greater than that of the trigger block, when the cabinet door is closed, the push block first contacts the guide slope, and the guide slope pushes the protective cover to slide away from the micro switch. This allows the protective cover to automatically release its obstruction of the micro switch after the cabinet door is closed, ensuring that the trigger block of the micro switch can properly abut against the moving contact when the cabinet door is fully closed. This allows the micro switch to disconnect when the door is closed, enabling the circuit breaker to conduct under normal power conditions. The guide slope smoothly converts the horizontal thrust of the push block into the sliding displacement of the protective cover, resulting in smooth and unhindered movement. This achieves the automatic repositioning function of the protective cover, requiring no additional operation steps and making it easy to use. When the micro switch is damaged and needs repair, the protective cover can be manually slid away from the micro switch, exposing it for easy maintenance.

[0014] Optionally, a clearance hole is provided on the wall of the guide groove. The clearance hole is located on the side of the guide groove near the micro switch. The clearance hole is used to allow the push block to extend into and move towards the micro switch.

[0015] By adopting the above technical solution, the clearance hole provides the push block with additional insertion space and movement path. During the door closing process, the push block first contacts the guide ramp and pushes the protective cover away from the micro switch. As the door continues to close, the push block slides along the guide ramp to the clearance hole position, allowing it to extend into the clearance hole and continue moving closer to the micro switch. This enables the push block to pass over the outer wall of the protective cover and reach the inner side of the protective cover when the door is fully closed, preventing interference between the push block and the protective cover and ensuring the normal closing of the door. This ensures that the trigger block can properly contact the moving contact when the door is closed, thus ensuring the micro switch can properly disconnect when the door is closed, and thus ensuring the normal operation of the metering box. This allows the push block to both push the protective cover to make way during the door closing process and ensures that the push block and trigger block are in their correct working positions after the door is fully closed. This guarantees the coordination and compatibility of the protective cover's automatic reset function and the micro switch's triggering function, improving the overall compactness and operational reliability of the micro switch.

[0016] Optionally, the protective cover is provided with an extension plate, and a sliding groove is provided on the extension plate. A sliding rod is slidably arranged in the sliding groove along the vertical direction. A return spring is provided on the sliding rod. The return spring is used to drive the sliding rod to slide towards the stationary contact piece. When the box door is closed, the sliding rod is located between the moving contact piece and the stationary contact piece.

[0017] By adopting the above technical solution, when the box door is closed, the trigger block abuts against the moving contact, causing the moving contact to separate from the stationary contact. At this time, the sliding rod slides towards the stationary contact under the action of the return spring, and the sliding rod is located between the moving contact and the stationary contact. At this time, the body of the sliding rod fills the separation gap between the moving contact and the stationary contact, which further plays a physical barrier role. This effectively prevents the moving contact from accidentally swinging towards the stationary contact due to vibration or misoperation, thus preventing the trip coil from being accidentally energized. It also avoids the circuit breaker from tripping unexpectedly due to the mis-triggering of the micro switch under normal power consumption conditions, ensuring the power supply stability and reliability of the power metering box during normal operation.

[0018] When the box door is opened, the trigger block first separates from the moving contact, causing the other end of the moving contact to move closer to the stationary contact. This moves the sliding rod between the moving and stationary contacts. Then, the push block moves out of the guide groove, releasing its limiting effect on the protective cover. Under its own weight, the protective cover slides closer to the micro switch, causing the extension plate and sliding rod to move synchronously. This allows the sliding rod to move out from between the moving and stationary contacts. Simultaneously, the sliding rod can clear and push out any debris that may be present in the gap between the moving and stationary contacts, ensuring that the moving and stationary contacts can properly contact and close the micro switch. This guarantees timely power cut-off when the box door is opened, reduces the risk of debris blocking the moving and stationary contacts and preventing closure, and further improves the detection safety of the power metering box.

[0019] Optionally, the protective cover is provided with a connecting spring, which has a tendency to drive the protective cover toward the micro switch.

[0020] By adopting the above technical solution, when the cabinet door is opened, the push block moves with the door and disengages from the protective cover. Under the elastic force of the connecting spring and the weight of the protective cover itself, it automatically slides towards the micro switch, thus quickly and reliably covering the micro switch. This achieves automatic and timely protection of the micro switch after the door is opened. The connecting spring eliminates the need for manual intervention in the protective cover's reset action, improving automation and ease of use. Furthermore, the spring force can be selected according to actual needs, ensuring smooth sliding of the protective cover while maintaining stability after it is in place, preventing accidental slippage due to slight vibration or tilt, and improving the reliability and stability of the protective cover's operation.

[0021] Optionally, the partition plate is provided with a fixing hole, and the protective cover is provided with a mounting hole. The fixing hole is located on the side of the partition plate away from the micro switch, and a fixing pin is slidably disposed in the fixing hole. The length of the fixing pin is greater than the total length of the fixing hole and the mounting hole.

[0022] By adopting the above technical solution, when a micro switch is damaged and needs repair, the power to the electricity metering box can be turned off first, and then the box door can be opened. At this time, the protective cover is placed on the micro switch. Then, the protective cover is slid away from the micro switch so that the mounting hole and the fixing hole are aligned. Then, the fixing pin is slid so that the fixing pin is simultaneously in the mounting hole and the fixing hole, thereby fixing the protective cover on the side away from the micro switch. This way, the micro switch is no longer covered by the protective cover, but is exposed, which makes it easier to inspect and repair the micro switch without having to hold the protective cover by hand all the time, making maintenance convenient.

[0023] Optionally, the protective cover is provided with ventilation holes.

[0024] By adopting the above technical solution, and by opening ventilation holes on the protective cover, the protective cover can provide physical protection for the micro switch while allowing air circulation between the space where the micro switch is located and the external environment through the ventilation holes. This effectively dissipates the heat generated by the micro switch during operation, prevents the micro switch from accumulating heat due to prolonged operation, which could affect its electrical performance and operating sensitivity, and ensures the working stability and electrical safety of the micro switch during long-term use.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting a trip coil in the circuit breaker and electrically connecting the trip coil to a micro switch, the opening action of the box door directly triggers the moving contact and stationary contact of the micro switch, realizing automatic tripping and power disconnection upon opening the door. This eliminates the need for maintenance personnel to manually disconnect the circuit breaker, fundamentally avoiding the risk of live operation due to forgetting to disconnect the power, and improving the safety of the electricity metering box during maintenance. 2. When the cabinet door is open, the protective cover can cover the outside of the micro switch, effectively preventing accidental triggering or electric shock accidents caused by maintenance personnel or tools accidentally touching the conductive parts of the micro switch during maintenance. At the same time, when the cabinet door is closed, the protective cover will automatically move out of place through the cooperation of the push block and the guide slope, realizing the automation and intelligence of the protection function and further improving the safety of maintenance operations. 3. When the box door is closed, the sliding rod moves between the moving and stationary contacts, preventing accidental contact between them and reducing the risk of accidental power failure of the metering box. When the box door is opened, the sliding rod moves out from between the moving and stationary contacts, thereby clearing the gap between them and ensuring normal connection between them, further ensuring timely power failure. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0027] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0028] Figure 3 This is a partial structural schematic diagram of the elastic element used in Embodiment 1 of this application.

[0029] Figure 4 This is a schematic diagram of the overall structure of Embodiment 2 of this application.

[0030] Figure 5 This is a partial structural schematic diagram of the clearance hole used in Embodiment 2 of this application.

[0031] Figure 6This is a partial cross-sectional structural diagram of the reset spring used to display the door opening in Embodiment 2 of this application.

[0032] Figure 7 This is a partial cross-sectional structural diagram of the push block used to display the door when the box door is closed in Embodiment 2 of this application.

[0033] Figure 8 This is a partial structural schematic diagram of the fixing pin used in Embodiment 2 of this application.

[0034] Explanation of reference numerals in the attached figures: 1. Cabinet; 11. Cabinet door; 111. Push block; 12. Bottom plate; 13. Side plate; 14. Partition; 141. Fixing hole; 142. Fixing pin; 15. Energy meter; 2. Micro switch; 21. Housing; 211. Rotating shaft; 22. Stationary contact; 23. Moving contact; 24. Trigger block; 25. Elastic element; 3. Protective cover; 31. Guide groove; 311. Guide slope; 312. Clearance hole; 32. Connecting spring; 33. Mounting hole; 34. Vent hole; 4. Extension plate; 41. Sliding groove; 42. Sliding rod; 43. Return spring. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0036] This application discloses a highly secure power metering box. Example 1

[0037] Reference Figure 1 and Figure 2 A high-security electricity metering box includes a box body 1, an electricity meter 15 installed in the box body 1, and a circuit breaker (not shown in the figure). The circuit breaker is equipped with a trip coil, and a micro switch 2 is energized to the trip coil. The opening and closing of the micro switch 2 directly controls the opening and closing of the power supply circuit of the trip coil.

[0038] Reference Figure 1 The enclosure 1 includes a door 11, a bottom plate 12, a side plate 13, and a partition 14 disposed on the side plate 13. The partition 14 extends vertically and is used to fix the micro switch 2.

[0039] Reference Figure 1 and Figure 2The micro switch 2 includes a housing 21 mounted on a partition 14, a stationary contact 22 mounted on the housing 21, a movable contact 23 mounted on the housing 21, and a trigger block 24 mounted on the inner wall of the door 11. The housing 21 is fixedly mounted on the partition 14, the stationary contact 22 is fixedly mounted on the housing 21, and the movable contact 23 is movably mounted on the housing 21. The trigger block 24 is fixedly mounted on the inner wall of the door 11, and when the door 11 is closed, the trigger block 24 protrudes towards the movable contact 23 to abut against and push the movable contact 23 to actuate.

[0040] Reference Figure 2 and Figure 3 A rotating shaft 211 is rotatably mounted on the housing 21, and the rotating shaft 211 is horizontally mounted on the housing 21. A movable contact 23 is fixedly mounted on the rotating shaft 211, and the movable contact 23 can rotate synchronously with the rotating shaft 211 around its axis. One end of the movable contact 23 is provided with an elastic element 25, one end of the elastic element 25 is disposed on the movable contact 23, and the other end is disposed on the housing 21. The elastic element 25 has a tendency to drive the movable contact 23 to move away from the end of the housing 21. A stationary contact 22 is disposed on the side of the rotating shaft 211 away from the elastic element 25, that is, the movable contact 23 is fulcrumped on the rotating shaft 211, with one end connected to the elastic element 25 and the other end disposed opposite to the stationary contact 22. In this embodiment, the elastic element 25 is preferably a spring.

[0041] Reference Figure 1 , Figure 2 and Figure 3 When the door 11 is closed, the trigger block 24 on the door 11 abuts against the end of the moving contact 23 with the elastic element 25, overcoming the elastic force of the elastic element 25, causing the moving contact 23 to rotate around the rotating shaft 211. The other end of the moving contact 23 tilts up and separates from the stationary contact 22. At this time, the micro switch 2 is in the open state, the power supply circuit of the trip coil is broken, the circuit breaker remains closed, and the power metering box operates normally.

[0042] Reference Figure 1 , Figure 2 and Figure 3 When the enclosure door 11 is opened, the trigger block 24 moves with the enclosure door 11 and separates from the moving contact 23. Under the elastic restoring force of the elastic element 25, the moving contact 23 rotates in the opposite direction around the rotating shaft 211, and the end of the moving contact 23 away from the elastic element 25 contacts the stationary contact 22. At this time, the micro switch 2 is in the closed state, the power supply circuit of the trip coil is turned on, and after the trip coil is energized, it drives the internal mechanism of the circuit breaker to act, so that the circuit breaker automatically trips and disconnects the power.

[0043] The implementation principle of Embodiment 1 of this application is as follows: by setting a trip coil electrically connected to the micro switch 2 in the circuit breaker, and using the trigger block 24 on the box door 11 to mechanically trigger the moving contact 23, the micro switch 2 is automatically triggered to close, the trip coil is energized, and the circuit breaker automatically trips and disconnects the power when the box door 11 is opened. At the same time, when the box door 11 is closed, the micro switch 2 is disconnected, the trip coil is de-energized, and the circuit breaker automatically closes, thereby improving the safety of maintaining the power metering box and ensuring the normal operation of the smart grid. Example 2

[0044] Reference Figure 4 The difference between Embodiment 2 and Embodiment 1 is that a protective cover 3 is slidably provided on the partition 14. The protective cover 3 is located outside the micro switch 2, and the protective cover 3 can slide up and down along the length of the partition 14.

[0045] Reference Figure 4 and Figure 5 The outer wall of the protective cover 3 is provided with a guide groove 31, and the groove wall of the guide groove 31 is provided with a guide slope 311. A push block 111 is fixedly provided on the inner wall of the door 11. The maximum distance between the push block 111 and the inner wall of the door 11 is greater than the maximum distance between the trigger block 24 and the inner wall of the door 11. When the door 11 is closed, the push block 111 abuts against the guide slope 311 before the trigger block 24. The guide slope 311 is used to guide the protective cover 3 to move away from the micro switch 2.

[0046] Reference Figure 4 , Figure 5 and Figure 6 A clearance hole 312 is provided on the wall of the guide groove 31, and the clearance hole 312 is located on the side of the guide groove 31 near the micro switch 2. When the door 11 continues to close, the push block 111 slides along the guide slope 311 to the clearance hole 312. The push block 111 can extend into the clearance hole 312 and move towards the micro switch 2, so that when the door 11 is completely closed, the push block 111 can pass through the clearance hole 312 and be located inside the protective cover 3 to avoid interference with the protective cover 3.

[0047] Reference Figure 6 and Figure 7An extension plate 4 is fixedly installed on the protective cover 3, located on the side of the protective cover 3 closest to the micro switch 2. A sliding groove 41 is provided on the extension plate 4, and a sliding rod 42 is slidably mounted vertically within the sliding groove 41. A return spring 43 is provided on the sliding rod 42, with one end of the return spring 43 attached to the sliding rod 42 and the other end attached to the extension plate 4. The return spring 43 drives the sliding rod 42 to slide towards the stationary contact piece 22. When the door 11 is fully closed, the sliding rod 42 slides upwards under the action of the return spring 43 into the gap between the moving contact piece 23 and the stationary contact piece 22. The rod body of the sliding rod 42 is located between the moving contact piece 23 and the stationary contact piece 22, providing a physical barrier.

[0048] Reference Figure 5 and Figure 7 The protective cover 3 is also equipped with a connecting spring 32, one end of which is attached to the protective cover 3 and the other end to the partition 14. The connecting spring 32 has a tendency to drive the protective cover 3 towards the micro switch 2. The elastic force of the connecting spring 32 is in the same direction as the gravity of the protective cover 3, jointly driving the protective cover 3 to slide downward. When the door 11 is opened, the protective cover 3 slides downward under the action of its own gravity and the elastic force of the connecting spring 32, thus completely covering the outside of the micro switch 2. When the door 11 is closed, the protective cover 3 is pushed upward, thereby releasing the obstruction of the micro switch 2.

[0049] Reference Figure 7 and Figure 8 The partition 14 has a fixing hole 141, and the protective cover 3 has a mounting hole 33. The fixing hole 141 is located on the side of the partition 14 away from the micro switch 2, that is, the fixing hole 141 is located on the partition 14 at a position offset from the micro switch 2. A fixing pin 142 is slidably disposed in the fixing hole 141, and the length of the fixing pin 142 is greater than the total length of the fixing hole 141 and the mounting hole 33. When the protective cover 3 is manually pushed upward until the mounting hole 33 is aligned with the fixing hole 141, the fixing pin 142 can be inserted into both the fixing hole 141 and the mounting hole 33 at the same time, locking the protective cover 3 in a position away from the micro switch 2, thereby facilitating the maintenance of the micro switch 2.

[0050] Reference Figure 7 The protective cover 3 is also provided with a vent 34, which penetrates the wall thickness of the protective cover 3 to allow air to circulate inside and outside the protective cover 3, which facilitates heat dissipation of the micro switch 2.

[0051] The implementation principle of this application embodiment is as follows: When the door 11 is opened, the protective cover 3 slides downward under its own weight and the elastic force of the connecting spring 32, covering the outside of the micro switch 2 and providing physical protection for the micro switch 2; at the same time, the sliding rod 42 moves down synchronously with the protective cover 3, clearing and pushing out the debris between the moving contact 23 and the stationary contact 22, ensuring that the moving contact 23 and the stationary contact 22 can make normal contact and close. When the door 11 is closed, the push block 111 first abuts against the guide slope 311, pushing the protective cover 3 to slide upward to make room, and then the push block 111 extends into the clearance hole 312 to avoid interference with the protective cover 3; at the same time, the trigger block 24 abuts against the moving contact 23 to separate the moving contact 23 from the stationary contact 22, and the sliding rod 42 slides upward under the action of the return spring 43 and fills the space between the moving contact 23 and the stationary contact 22, playing a physical blocking role. When the micro switch 2 is damaged and needs repair, the protective cover 3 can be pushed upwards, allowing the fixing pin 142 to insert into the fixing hole 141 and the mounting hole 33 to lock the protective cover 3, exposing the micro switch 2 for inspection. Throughout the maintenance process, the power is automatically cut off and protected when the door is opened, and the door is automatically reset and prevents false triggering when closed, improving the safety and reliability of the electricity metering box.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-security electricity metering box, comprising a box body (1), an electricity meter (15) installed in the box body (1), and a circuit breaker, characterized in that: The circuit breaker is equipped with a trip coil, and a micro switch (2) is electrically connected to the trip coil. The enclosure (1) includes a door (11), a bottom plate (12), a side plate (13), and a partition (14) on the side plate (13). The micro switch (2) includes a housing (21) on the partition (14), a stationary contact (22) on the housing (21), a moving contact (23) on the housing (21), and a trigger block (24) on the inner wall of the door (11). When the door (11) is opened, the trigger block (24) separates from the moving contact (23), and the moving contact (23) contacts the stationary contact (22).

2. The high-security electricity metering box according to claim 1, characterized in that: A rotating shaft (211) is rotatably mounted on the housing (21). The movable contact piece (23) is mounted on the rotating shaft (211). One end of the movable contact piece (23) is provided with an elastic element (25). The elastic element (25) is mounted on the housing (21). The elastic element (25) has a tendency to drive the movable contact piece (23) to move away from the housing (21). The stationary contact piece (22) is mounted on the side of the rotating shaft (211) away from the elastic element (25). When the door (11) is closed, the trigger block (24) abuts against the end of the movable contact piece (23) where the elastic element (25) is located.

3. The high-security electricity metering box according to claim 1, characterized in that: A protective cover (3) is slidably disposed on the partition (14). When the box door (11) is opened, the protective cover (3) covers the micro switch (2). A guide groove (31) is provided on the outer wall of the protective cover (3). A guide slope (311) is provided on the groove wall of the guide groove (31). A push block (111) is provided on the inner wall of the box door (11). The maximum distance between the push block (111) and the box door (11) is greater than the maximum distance between the trigger block (24) and the box door (11). When the box door (11) is closed, the push block (111) abuts against the guide slope (311). The guide slope (311) is used to guide the protective cover (3) to move away from the micro switch (2).

4. The high-security electricity metering box according to claim 3, characterized in that: The guide groove (31) has a clearance hole (312) on its groove wall. The clearance hole (312) is located on the side of the guide groove (31) near the micro switch (2). The clearance hole (312) is used to allow the push block (111) to extend into it and move towards the micro switch (2).

5. A high-security electricity metering box according to claim 3, characterized in that: The protective cover (3) is provided with an extension plate (4), and the extension plate (4) is provided with a sliding groove (41). A sliding rod (42) is slidably arranged in the sliding groove (41) along the vertical direction. A return spring (43) is provided on the sliding rod (42). The return spring (43) is used to drive the sliding rod (42) to slide towards the stationary contact piece (22). When the box door (11) is closed, the sliding rod (42) is located between the moving contact piece (23) and the stationary contact piece (22).

6. A high-security electricity metering box according to claim 3, characterized in that: The protective cover (3) is provided with a connecting spring (32), which has a tendency to drive the protective cover (3) to move closer to the micro switch (2).

7. A high-security electricity metering box according to claim 6, characterized in that: The partition (14) has a fixing hole (141) and the protective cover (3) has an installation hole (33). The fixing hole (141) is located on the side of the partition (14) away from the micro switch (2). A fixing pin (142) is slidably disposed in the fixing hole (141). The length of the fixing pin (142) is greater than the total length of the fixing hole (141) and the installation hole (33).

8. A high-security electricity metering box according to claim 3, characterized in that: The protective cover (3) has ventilation holes (34).

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