A wall-mounted meter box

Abstract

The application relates to a wall-mounted metering box, and relates to the technical field of electrical equipment, which comprises a shell, a fixed plate, a copper bar system, a cover plate, a guiding mechanism and a locking mechanism. The copper bar system is arranged on the fixed plate and is provided with a socket, the cover plate is slidingly arranged on the shell and is provided with a circuit breaker with a plug pin. The locking mechanism comprises an electromagnetic adsorption structure arranged on the cover plate, an armature arranged on the shell, an elastic member arranged between the cover plate and the shell, a power taking structure arranged at the plug pin and a clamping structure arranged between the cover plate and the shell. The power taking structure takes power from the plug pin to supply the electromagnetic adsorption structure when the plug pin is in contact with the socket, so that the electromagnetic adsorption structure is attracted to the armature to lock the cover plate in a closed position; after the circuit breaker is powered off, the clamping structure bears the elastic force of the elastic member to keep the cover plate in the closed position. The application realizes integrated operation of the contact between the plug pin and the socket, locking and mechanical keeping after power-off.

Description

Technical Field

[0001] This application relates to the field of electrical equipment technology, and in particular to a wall-mounted metering box. Background Technology

[0002] Wall-mounted metering boxes are widely used in residential communities, commercial buildings, and industrial plants for electricity metering and distribution. They typically contain electrical components such as circuit breakers and electricity meters, and are electrically connected to each other via copper busbars.

[0003] In related technologies, the internal wiring of metering boxes is mostly exposed on the front, with copper busbars or wires laid directly on the front of the mounting plate. The cables are crisscrossed and tangled, causing not only congestion inside the box but also significant inconvenience for on-site assembly and subsequent maintenance. To solve this problem of messy cables, various concealed wiring solutions have emerged in the prior art. For example, Chinese patent CN122118532A discloses a metering box with concealed wiring functionality, which uses a cable management component on the back of the partition to house the cables within a closed mounting opening, achieving a concealed cable arrangement.

[0004] However, in this solution, the cable management assembly on the back of the partition is only used to hold and manage the cables, and the cover on the front of the partition only serves to shield and protect. The electrical connections between each component (such as the circuit breaker) and the copper busbar still need to be wired manually one by one, which is cumbersome and inefficient. Summary of the Invention

[0005] To improve assembly efficiency, this application provides a wall-mounted metering box.

[0006] The wall-mounted metering box provided in this application adopts the following technical solution: A wall-mounted metering box includes a housing; a fixing plate installed inside the housing; a copper busbar system disposed on the fixing plate, the copper busbar system having a socket; a cover plate slidably disposed on the housing, the cover plate having a circuit breaker with a pin; a guide mechanism disposed between the housing and the cover plate for guiding the cover plate to slide back and forth; an electromagnetic adsorption structure mounted on the cover plate; an armature mounted on the housing, the electromagnetic adsorption structure facing the armature when the cover plate slides to the closed position; and an elastic element disposed between the cover plate and the housing, always applying a force to the cover plate in the opening direction. The power-taking structure is located at the pin and is electrically connected to the electromagnetic adsorption structure; and the locking structure is located between the cover plate and the housing to fix the cover plate and the housing relative to each other. The power-taking structure is used to draw power from the pin to supply the electromagnetic adsorption structure when the pin is in contact with the socket, so that the electromagnetic adsorption structure is energized and attracts the armature, locking the cover plate in the closed position. The elastic force of the elastic element is less than the attraction force of the electromagnetic adsorption structure. The locking structure is used to fix the cover plate and the housing relative to each other when the cover plate is in the closed position. When the circuit breaker is de-energized, the locking structure bears the elastic force of the elastic element and keeps the cover plate in the closed position.

[0007] By adopting the above technical solution, the power-gathering structure draws power from the pin to supply the electromagnetic adsorption structure, achieving an instant response where "the electromagnetic adsorption structure is energized and engaged as soon as the pin contacts the socket." This eliminates the need for an independent power supply or additional control circuitry, avoiding the logic deadlock problem associated with electromagnet-powered systems. The electromagnetic adsorption structure and the locking structure form a dual locking mechanism—the cover is kept closed by electromagnetic force during normal operation, and mechanically closed by the locking structure after power failure. Even if the electromagnetic adsorption structure loses power, the locking structure can still independently withstand the elastic force of the elastic element, ensuring that the cover will not accidentally pop out. Simultaneously, through the coordinated operation of the electromagnetic adsorption structure, the elastic element, and the locking structure, an integrated function is achieved where the cover automatically completes insertion and locking upon closure and automatically enters a mechanical locking state after power failure, requiring no manual intervention and thus improving assembly efficiency.

[0008] Optionally, the locking structure includes a limiting block fixedly installed on the inner wall of the housing, a limiting piece fixedly installed on the cover plate, and a limiting rod passing through the limiting block and the limiting piece.

[0009] By adopting the above technical solution, the matching structure of the limiting block, limiting plate, and limiting rod is simple and reliable. Operators can lock and release the cover plate by inserting and removing the limiting rod without special tools, making operation convenient. The limiting block is fixed to the housing, the limiting plate is fixed to the cover plate, and the two are directly connected by the limiting rod, resulting in a short force transmission path and reliable locking.

[0010] Optionally, a limit blind hole is provided on the limit block, a limit hole is provided on the limit piece, and the limit rod passes through the limit hole and extends into the limit blind hole.

[0011] By adopting the above technical solution, the limiting hole and the limiting blind hole are coaxially arranged, and the limiting rod forms two-point support after passing through, resulting in uniform force distribution and accurate positioning. The blind hole structure encloses the end of the limiting rod inside the limiting block, preventing the limiting rod from coming out of the limiting block end under vibration or external force, thus improving the reliability of locking.

[0012] Optionally, the blind hole for limiting is filled with a rubber pad, and the rubber pad has a through hole for the limiting rod to pass through.

[0013] By adopting the above technical solution, the rubber pad provides elastic support and buffer for the limiting rod, which can absorb impact force, reduce noise and wear; at the same time, the elastic deformation of the rubber pad can compensate for the manufacturing and assembly tolerances between the limiting rod and the limiting blind hole, ensuring that the limiting rod is inserted smoothly without shaking, and improving the long-term stability of the locking structure.

[0014] Optionally, the power-taking structure is a ring-shaped power-taking component, which is sleeved on the outer periphery of the pin, and its inner wall is elastically abutting against the outer wall of the pin.

[0015] By adopting the above technical solution, the annular power-collecting component is sleeved around the outer periphery of the pin, forming a 360° annular elastic contact with the outer wall of the pin. This provides a large contact area, reliable power collection, and does not interfere with the normal insertion and mating of the pin and the socket. The annular power-collecting component moves in tandem with the cover plate, completing power collection the instant the pin is inserted into the socket. The electromagnetic adsorption structure is simultaneously energized, resulting in a rapid response.

[0016] Optionally, the inner wall of the annular power take-up element is provided with multiple elastic contacts, and the annular power take-up element is made of phosphor bronze or beryllium copper.

[0017] By adopting the above technical solution, multiple elastic contacts are distributed circumferentially to form multi-point contact. Even if individual contacts experience elastic decay due to long-term use, the remaining contacts can still ensure reliable electrical contact, improving the redundancy and service life of power supply. Phosphor bronze or beryllium copper has excellent conductivity, elasticity, and fatigue resistance, and can withstand the elastic deformation caused by repeated insertion and removal of pins without permanent deformation.

[0018] Optionally, the electromagnetic adsorption structure includes a mounting part, an electric receiving part, and a magnetic force generating part. The mounting part is fixedly connected to the cover plate, the magnetic force generating part passes through the cover plate and faces the armature, and the electric receiving part is connected to the power taking structure.

[0019] By adopting the above technical solution, the functional areas of the installation section, the power connection section, and the magnetic force generating section are clearly defined, with a high degree of modularity, facilitating assembly and maintenance. The magnetic force generating section penetrates the cover plate and faces directly towards the armature, shortening the magnetic path distance between the magnetic force generating section and the armature, reducing magnetic resistance, and improving the attraction efficiency.

[0020] Optionally, the guiding mechanism includes a slide fixedly installed inside the housing and a slider fixedly mounted on the cover plate, with the slider slidingly engaged with the slide.

[0021] By adopting the above technical solution, the sliding fit structure of the slide block and the slider is simple and reliable, which can accurately guide the cover plate to slide in a predetermined direction, ensure the alignment accuracy of the pin and the socket, and avoid poor contact or damage to the pin caused by the pin being inserted at an angle.

[0022] Optionally, a guide post is fixedly connected to the slide block, a guide hole is opened on the slider, the guide post passes through the guide hole, and an elastic element is sleeved on the guide post and located between the slider and the slide block.

[0023] By adopting the above technical solution, the cooperation between the guide post and the guide hole provides further precise guidance for the sliding of the cover plate, ensuring the straightness and stability of the cover plate's sliding process. At the same time, the guide post also serves as the mounting base for the elastic element. The elastic element is fitted onto the guide post without the need for additional mounting structures, achieving "one post for two purposes," with a simple structure and high space utilization.

[0024] Optionally, the copper busbar system is located on the back of the fixing plate, forming a hidden cavity between the fixing plate and the back plate of the housing, and the copper busbar system is located in the hidden cavity.

[0025] By adopting the above technical solution, the copper busbar system is completely hidden in the cavity between the back of the fixing plate and the back plate of the housing. The front of the fixing plate is clean with no exposed main cables, realizing concealed wiring, improving the space utilization and visual cleanliness inside the cabinet, while avoiding the risk of electric shock and short circuit caused by exposed cables, thus improving safety.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By drawing power from the pins through the power-taking structure to supply the electromagnetic adsorption structure, an instant response is achieved where "the electromagnetic adsorption structure is energized and engaged as soon as the pins contact the socket." This eliminates the need for an independent power supply or additional control circuit, fundamentally avoiding the logic deadlock problem of electromagnet power supply. 2. A dual locking mechanism is formed by the electromagnetic adsorption structure and the locking structure. During normal operation, the cover is kept closed by electromagnetic force. After power failure, the locking structure mechanically keeps the cover closed. Even if the electromagnetic adsorption structure loses power, the locking structure can still independently withstand the elastic force of the elastic element, ensuring that the cover will not pop out accidentally. 3. Through the coordinated operation of the electromagnetic adsorption structure, elastic element and locking structure, the integrated function of automatically completing the insertion and locking when the cover is closed and automatically entering the mechanical locking state after power failure is achieved, without the need for manual intervention. 4. Through the cooperation of the limiting block, limiting plate and limiting rod in the locking structure, the operator can lock and release the cover plate by inserting and pulling the limiting rod. No special tools are required, and the operation is convenient. The setting of the limiting blind hole and rubber pad improves the reliability of locking and the stability of long-term use. 5. The ring-shaped power-collecting component is sleeved around the outer periphery of the pin and elastically abuts against the outer wall of the pin. It has a large contact area and reliable power collection. Power is collected the moment the pin is inserted into the socket. The electromagnetic adsorption structure is simultaneously energized, resulting in a rapid response. 6. By setting multiple elastic contacts on the inner wall of the annular power-taking component and using phosphor bronze or beryllium copper material, multi-point contact redundancy is formed, which improves the reliability and service life of power taking and can withstand the elastic deformation caused by repeated insertion and removal of the pin without permanent deformation. 7. Through the sliding cooperation between the slide block and the slider, and the cooperation between the guide post and the guide hole, the cover plate is precisely guided to slide in the predetermined direction, ensuring the alignment accuracy of the pin and the socket, avoiding poor contact or damage to the pin due to misalignment during insertion, and the guide post also serves as the installation base for the elastic element, with a simple structure and high space utilization. 8. By placing the copper busbar system on the back of the mounting plate and utilizing the hidden cavity between the mounting plate and the back panel of the housing to accommodate the copper busbar system, concealed wiring is achieved, improving the space utilization and safety of the enclosure. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a schematic diagram of the structure of this application; Figure 3 This is a structural schematic diagram of the present application, mainly showing the fixing plate; Figure 4 This is a structural diagram of the present application, mainly illustrating the copper busbar system; Figure 5 yes Figure 3 A magnified view of part A in the middle; Figure 6 yes Figure 2 A magnified view of part A in the diagram.

[0028] In the diagram, 1. Housing; 2. Fixing plate; 3. Copper busbar system; 4. Cover plate; 5. Sliding guide mechanism; 501. Slide block; 502. Slider; 503. Connecting block; 504. Guide bar; 6. Locking mechanism; 601. Electromagnetic adsorption structure; 6011. Mounting part; 6012. Power receiving part; 6013. Magnetic force generating part; 602. Armature; 603. Return spring; 604. Ring-shaped power taking part; 605. Locking structure; 6051. Limiting block; 6052. Limiting piece; 6053. Limiting rod; 6054. Rubber pad; 7. Socket; 8. Pin; 9. Support column; 10. Elastic conductive clip; 11. Ring-shaped buffer pad; 12. Guide column. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1 -Appendix Figure 6This application will be described in further detail below.

[0030] This invention provides a wall-mounted metering box, with reference to... Figures 1-4 It includes a housing 1, a fixing plate 2, a copper busbar system 3, a cover plate 4, a sliding guide mechanism 5, and a locking mechanism 6.

[0031] The housing 1 is a rectangular hollow box structure, fixedly mounted to the wall on its back. A fixing plate 2 is installed inside the housing 1. A copper busbar system 3 is mounted on the fixing plate 2, and a socket 7 is provided on the copper busbar system 3. A cover plate 4 is slidably mounted on the housing 1, and a circuit breaker with pins 8 is mounted on the cover plate 4. A sliding guide mechanism 5 is located between the housing 1 and the cover plate 4, guiding the cover plate 4 to slide back and forth in a direction perpendicular to the front of the fixing plate 2. A locking mechanism 6 is located between the cover plate 4 and the housing 1, locking the cover plate 4 in the closed position when the circuit breaker is energized, and ejecting the cover plate 4 to a predetermined position after the circuit breaker is de-energized.

[0032] The housing 1 is molded from a metal sheet or flame-retardant insulating material, and is in the shape of a rectangular hollow box. The back plate of the housing 1 has mounting holes for fixing the housing 1 to the wall, as well as inlet holes and outlet holes for introducing external power lines and leading out load lines, respectively.

[0033] The fixing plate 2 is installed inside the housing 1. It is a rectangular flat plate structure made of high-strength insulating material, preferably SMC composite material or flame-retardant ABS plastic injection molding. Support columns 9 are fixed at the four corners of the back of the fixing plate 2. These support columns 9 are columnar insulating components with a hollow interior. When the fixing plate 2 is connected to the housing 1, a long screw passes through the support column 9 and is threaded to the back plate of the housing 1.

[0034] After installation, a hidden cavity is formed between the fixing plate 2 and the back plate of the housing 1, which is used to accommodate the copper busbar system 3. Furthermore, the size of the fixing plate 2 is smaller than the internal size of the housing 1, and its edge has a gap with the inner wall of the housing 1 to ensure that the cover plate 4 can slide freely within the housing 1. In addition, a predetermined distance is maintained between the front side of the fixing plate 2 (the side facing the cover plate 4) and the front end face of the housing 1. This distance is not less than the sum of the thickness of the cover plate 4 and the insertion / removal stroke of the pin 8, to ensure that the cover plate 4 completely covers the front side of the fixing plate 2 when in the closed position.

[0035] The copper busbar system 3 is installed on the back of the mounting plate 2 and located inside the concealed cavity to achieve concealed wiring, making the front of the mounting plate 2 clean and free of exposed main cables. The copper busbar system 3 includes several phase copper busbars (such as phase A copper busbar, phase B copper busbar, phase C copper busbar and neutral copper busbar), each phase copper busbar is a flat strip conductor, and is fixedly installed on the back of the mounting plate 2.

[0036] Each phase copper busbar is equipped with a socket 7, which is fixedly mounted on the front of the mounting plate 2, corresponding to the installation position of the circuit breaker. The socket 7 contains an elastic conductive clip 10, which has opposing elastic clamping arms. The distance between the two clamping arms is smaller than the diameter of the pin 8, so that when the pin 8 is inserted, the clamping arms are stretched open and generate an elastic clamping force, thereby forming a tight electrical contact with the pin 8. The elastic conductive clip 10 is electrically connected to the corresponding copper busbar.

[0037] Cover plate 4 is located on the front of fixing plate 2, and is generally rectangular flat. Its size is adapted to the internal dimensions of housing 1, and it can cover the front of fixing plate 2 when closed. Cover plate 4 is made of insulating material. A sliding gap is left between the edge of cover plate 4 and the inner surface of housing 1 to ensure that cover plate 4 can slide freely in the front-back direction. The outer surface of cover plate 4 is detachably connected to the circuit breaker. The cover plate 4 has needle holes for the pins 8 to pass through, and the position of the needle holes corresponds one-to-one with the position of the pins 8 of the circuit breaker and the position of the socket 7 on fixing plate 2.

[0038] Reference Figure 3 , Figure 5 The sliding guide mechanism 5 is used to guide the cover plate 4 to slide back and forth in a direction perpendicular to the front of the fixed plate 2 (i.e., the front-to-back direction). It includes a slide block 501 disposed in the housing 1 and a slider 502 that slides in cooperation with the slide block 501.

[0039] The slides 501 are fixedly installed at the four corners inside the housing 1. Each slide 501 is parallel to the others, and its extension direction is consistent with the axial direction of the socket 7, that is, consistent with the insertion and removal direction of the pin 8.

[0040] The slide block 501 is provided with two mutually perpendicular docking slides and guide slides, which extend toward the opening side of the housing 1. The docking slide is provided with a protruding docking block 503, which has a dovetail-shaped cross-section and is fixed to the docking slide by screws; the guide slide is provided with an arc-shaped groove.

[0041] Reference Figure 3 , Figure 4 , Figure 5 The sliders 502 are fixedly mounted at the four corners of the cover plate 4, and their positions correspond one-to-one with the positions of the slide blocks 501. The slider 502 has a guide groove matching the shape of the docking block 503 on the side facing the docking slide, and a guide strip 504 integrally formed matching the arc-shaped slide groove on the side facing the guide slide. Each slider 502 slides in cooperation with its corresponding slide block 501, so that the cover plate 4 can only slide back and forth along the extension direction of the slide block 501, thereby ensuring the alignment accuracy of the pin 8 and the socket 7.

[0042] Reference Figure 2 , Figure 3 , Figure 4 The locking mechanism 6 is used to lock the cover plate 4 in the closed position when the circuit breaker is energized and to pop the cover plate 4 to a predetermined position after the circuit breaker is de-energized. It includes an electromagnetic adsorption structure 601, an armature 602, a reset spring 603, an annular power take-up component 604, and a locking structure 605.

[0043] The electromagnetic adsorption structure 601 is fixedly mounted on the cover plate 4 by screws. It includes a mounting part 6011, a power receiving part 6012, and a magnetic force generating part 6013. The mounting part 6011 is fixed to the outer side of the cover plate 4 by screws. The magnetic force generating part 6013 and the power receiving part 6012 both penetrate the cover plate 4. The magnetic force generating part 6013 has a flat adsorption end face facing the fixing plate 2. The adsorption end face is precision ground and the surface roughness Ra is not greater than 0.8μm.

[0044] An armature 602 is installed in an armature 602 frame located on the inner surface of the back plate of the housing 1, below the fixing plate 2. An armature 602 slot is formed within the armature 602 frame, and it is fixed to the housing 1 by adhesive. The position of the armature 602 corresponds to the position of the electromagnetic adsorption structure 601. When the cover plate 4 slides to the closed position, the armature 602 is directly opposite the magnetic force generating part 6013 of the electromagnetic adsorption structure 601.

[0045] The armature 602 is made of a magnetically conductive material (such as pure iron or low-carbon steel), and its end facing the cover plate 4 has a flat contact surface. This contact surface is also precision ground, with a surface roughness Ra not exceeding 0.8 μm. When the cover plate 4 slides to the closed position, the contact end face of the electromagnetic adsorption structure 601 and the contact surface of the armature 602 are directly opposite each other, with a gap of no more than 0.05 mm between them. The magnetic force generated when the electromagnetic adsorption structure 601 is energized attracts the cover plate 4 to the armature 602, thereby locking the cover plate 4 in the closed position. An annular buffer pad 11, made of an elastic material, is embedded in the contact surface of the armature 602.

[0046] The annular power take-off component 604 is a ring-shaped member made of conductive material, fitted around the outer circumference of the pin 8 at the circuit output end of the circuit breaker, with its inner diameter matching the outer diameter of the pin 8. The inner wall of the annular power take-off component 604 elastically abuts against the outer wall of the pin 8, forming a reliable electrical contact. The annular power take-off component 604 is made of elastic conductive material, such as phosphor bronze or beryllium copper, and its inner wall is provided with multiple circumferentially distributed elastic contacts. The annular power take-off component 604 is connected to the energizing part 6012 of the electromagnetic adsorption structure 601 via a wire. When the pin 8 is inserted into the socket 7 and establishes an electrical connection with the copper busbar system 3, the annular power take-off component 604 obtains power from the pin 8 and transmits it to the electromagnetic adsorption structure 601 via the wire, causing the electromagnetic adsorption structure 601 to be energized and generate an attractive force.

[0047] Reference Figure 3 , Figure 4, Figure 5 A guide post 12 is fixedly connected to the slide block 501, and a guide hole is provided through the slide block 502, through which the guide post 12 passes. A return spring 603 is sleeved on the guide post 12 and located between the slide block 502 and the slide block 501. After installation, the return spring 603 always applies an elastic force to the cover plate 4 in the direction of the front of the housing 1 (i.e., away from the fixed plate 2), and its elastic force is less than the attraction force of the electromagnetic adsorption structure 601. Moreover, the elastic forces of the four return springs 603 are equal and act synchronously to ensure that the cover plate 4 is subjected to balanced force when it pops out and does not tilt.

[0048] Reference Figure 2 , Figure 6 The locking structure 605 is used to fix the cover plate 4 when the circuit breaker is de-energized and to prevent the cover plate 4 from moving. It includes a limiting block 6051, a limiting piece 6052, and a limiting rod 6053. Two limiting blocks 6051 are provided and fixedly installed on the inner walls of both sides of the housing 1. A limiting blind hole is formed on the side of the limiting block 6051 facing the cover plate 4. This limiting blind hole is strip-shaped and filled with a rubber pad 6054 with a through hole. The position and number of the limiting pieces 6052 correspond to those of the limiting blocks 6051. They are fixed to the outer side of the cover plate 4 by screws. A limiting hole is formed on the limiting piece 6052. After installation, the limiting hole on the limiting piece 6052 and the through hole on the rubber pad 6054 are on the same axis. The limiting rod 6053 passes through the limiting hole and extends into the through hole of the rubber pad 6054. The limiting rod 6053 and the limiting piece 6052 are fixed by nuts.

[0049] The implementation principle of this embodiment is as follows: In the initial state, the circuit breaker is not energized, the electromagnetic adsorption structure 601 is not energized, the cover plate 4 is kept in the open position under the elastic force of the return spring 603, and the pin 8 is separated from the socket 7.

[0050] After the operator installs the circuit breaker on the outer surface of the cover plate 4, they manually push the cover plate 4 to slide it into the housing 1 along the slide block 501. The slider 502 moves synchronously along the docking track and guide track of the slide block 501, constraining and guiding the sliding direction of the cover plate 4, ensuring that the cover plate 4 moves smoothly in a direction perpendicular to the front of the fixed plate 2. During the sliding process of the cover plate 4 into the housing 1, the pin 8 on the circuit breaker passes through the pin hole on the cover plate 4 and gradually inserts into the socket 7 set on the front of the fixed plate 2. When the pin 8 is inserted into the socket 7, a pair of elastic clamping arms of the elastic conductive clip 10 in the socket 7 are opened by the pin 8, generating an elastic clamping force to tightly clamp the pin 8 and form a stable electrical contact. At the same time, the annular power taking part 604 sleeved on the outer periphery of the pin 8 elastically abuts against the outer wall of the pin 8, obtains power from the pin 8, and transmits it through the wire to the receiving part 6012 of the electromagnetic adsorption structure 601, so that the electromagnetic adsorption structure 601 is energized and generates an attraction force.

[0051] When the cover plate 4 slides to the fully closed position, the engaging end face of the electromagnetic adsorption structure 601 is directly aligned with the engaging surface of the armature 602. The magnetic force generated by the electromagnetic adsorption structure 601 attracts the cover plate 4 to the armature 602, locking the cover plate 4 in the closed position. At this time, electrical conduction is achieved between the circuit breaker and the copper busbar system 3 through the insertion and connection of the pin 8 and the socket 7, and the metering box is in normal operation. Although the return spring 603 is compressed and stores elastic potential energy, its elastic force is less than the engaging force of the electromagnetic adsorption structure 601, and it cannot push the cover plate 4 open.

[0052] After the cover plate 4 is in the closed position, the operator inserts the limiting rod 6053 through the limiting hole on the limiting piece 6052 and into the limiting blind hole on the limiting block 6051, and then fixes the limiting rod 6053 to the limiting piece 6052 with a nut. At this time, the limiting rod 6053 is in a relaxed state (i.e., the limiting rod 6053 is not under force and only exists as a preset mechanical limiting component). When the electromagnetic adsorption structure 601 is normally energized, the cover plate 4 is kept closed by electromagnetic force, and the limiting rod 6053 does not participate in the force.

[0053] When the circuit breaker is de-energized, pin 8 loses power, the annular power take-up component 604 stops supplying power to the electromagnetic adsorption structure 601, the electromagnetic adsorption structure 601 loses power, the magnetic force disappears, and the attraction force is released. At this time, the return spring 603 releases its elastic potential energy, pushing the slider 502 to slide along the slide block 501 towards the front of the housing 1, and the cover plate 4 tends to move in the opening direction. However, since the limiting rod 6053 has been pre-inserted into the limiting hole and the limiting blind hole, and the limiting block 6051 is fixed to the inner side wall of the housing 1 and the limiting piece 6052 is fixed to the outer surface of the cover plate 4, the limiting rod 6053 fixes the cover plate 4 relative to the housing 1, and the displacement of the cover plate 4 in the opening direction is blocked by the limiting rod 6053. The cover plate 4 cannot move, the elastic force of the return spring 603 is borne by the limiting rod 6053, the cover plate 4 remains in the closed position, and the pin 8 and the socket 7 remain in the plugged state.

[0054] When the operator needs to open the cover plate 4 for maintenance, first confirm that the circuit breaker is de-energized, then loosen the nut and pull out the limit rod 6053 to release the constraint of the limit rod 6053 on the cover plate 4. Subsequently, the return spring 603 releases its elastic potential energy, pushing the cover plate 4 to slide forward of the housing 1, the pin 8 is pulled out of the socket 7, the elastic clamping arm of the elastic conductive clip 10 resets, the electrical contact between the pin 8 and the socket 7 is broken, and the cover plate 4 pops out to the open position.

[0055] After the maintenance is completed, the operator pushes the cover plate 4 to close again, inserts the pin 8 into the socket 7 to energize and engage the electromagnetic adsorption structure 601, and locks the cover plate 4 in the closed position. The operator then inserts the limit rod 6053 into the limit hole and the limit blind hole and fixes it, and the metering box returns to normal operation.

[0056] In summary, the limit rod 6053 is pre-installed when the cover plate 4 is closed. Its function is to: when the circuit breaker is de-energized and the electromagnetic adsorption structure 601 is deactivated, it replaces the electromagnetic adsorption structure 601 in bearing the spring force of the return spring 603, keeping the cover plate 4 in the closed position and preventing the cover plate 4 from automatically popping out due to the action of the return spring 603. The limit rod 6053 and the electromagnetic adsorption structure 601 form a double locking mechanism—during normal operation, the electromagnetic adsorption structure 601 keeps the cover plate 4 closed, and after power failure, the limit rod 6053 mechanically keeps the cover plate 4 closed.

[0057] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A wall-mounted metering box, characterized in that, include: Shell (1); A fixing plate (2) is installed inside the housing (1); A copper busbar system (3) is installed on the fixing plate (2), and a socket (7) is provided on the copper busbar system (3); A cover plate (4) is slidably disposed on the housing (1), and a circuit breaker is disposed on the cover plate (4), the circuit breaker having a pin (8); A guiding mechanism is disposed between the housing (1) and the cover plate (4) for guiding the cover plate (4) to slide back and forth; An electromagnetic adsorption structure (601) is installed on the cover plate (4); An armature (602) is mounted on the housing (1). When the cover plate (4) is slid to the closed position, the electromagnetic adsorption structure (601) is directly opposite the armature (602). An elastic element is disposed between the cover plate (4) and the housing (1) and always applies a force toward the opening direction to the cover plate (4); A power-collecting structure is disposed at the pin (8) and electrically connected to the electromagnetic adsorption structure (601); A locking structure (605) is disposed between the cover plate (4) and the housing (1) for fixing the cover plate (4) and the housing (1) relative to each other; The power-taking structure is used to draw power from the pin (8) and supply it to the electromagnetic adsorption structure (601) when the pin (8) contacts the socket (7), so that the electromagnetic adsorption structure (601) is energized and attracts the armature (602), locking the cover plate (4) in the closed position; the elastic force of the elastic element is less than the attraction force of the electromagnetic adsorption structure (601); The locking structure (605) is used to fix the cover plate (4) relative to the housing (1) when the cover plate (4) is in the closed position. When the circuit breaker is de-energized, the locking structure (605) bears the elastic force of the elastic element and keeps the cover plate (4) in the closed position.

2. The wall-mounted metering box according to claim 1, characterized in that, The locking structure (605) includes a limiting block (6051) fixedly installed on the inner wall of the housing (1), a limiting piece (6052) fixedly installed on the cover plate (4), and a limiting rod (6053) passing through the limiting block (6051) and the limiting piece (6052).

3. The wall-mounted metering box according to claim 2, characterized in that, The limiting block (6051) has a limiting blind hole, the limiting piece (6052) has a limiting hole, and the limiting rod (6053) passes through the limiting hole and extends into the limiting blind hole.

4. The wall-mounted metering box according to claim 3, characterized in that, The limiting blind hole is filled with a rubber pad (6054), and the rubber pad (6054) has a through hole for the limiting rod (6053) to pass through.

5. The wall-mounted metering box according to claim 1, characterized in that, The power extraction structure is a ring-shaped power extraction component (604), which is sleeved on the outer periphery of the pin (8), and its inner wall is elastically abutting against the outer wall of the pin (8).

6. The wall-mounted metering box according to claim 5, characterized in that, The inner wall of the annular power-collecting component (604) is provided with multiple elastic contacts, and the annular power-collecting component (604) is made of phosphor bronze or beryllium copper.

7. The wall-mounted metering box according to claim 1, characterized in that, The electromagnetic adsorption structure (601) includes a mounting part (6011), a power receiving part (6012), and a magnetic force generating part (6013). The mounting part (6011) is fixedly connected to the cover plate (4). The magnetic force generating part (6013) passes through the cover plate (4) and faces the armature (602). The power receiving part (6012) is connected to the power taking structure.

8. The wall-mounted metering box according to claim 1, characterized in that, The guiding mechanism includes a slide block (501) fixedly installed in the housing (1) and a slider (502) fixedly installed on the cover plate (4), wherein the slider (502) slides in cooperation with the slide block (501).

9. The wall-mounted metering box according to claim 8, characterized in that, A guide post (12) is fixedly connected to the slide block (501), and a guide hole is provided on the slider (502). The guide post (12) passes through the guide hole, and the elastic element is sleeved on the guide post (12) and located between the slider (502) and the slide block (501).

10. The wall-mounted metering box according to claim 1, characterized in that, The copper busbar system (3) is disposed on the back of the fixing plate (2), and a hidden cavity is formed between the fixing plate (2) and the back plate of the housing (1), and the copper busbar system (3) is located in the hidden cavity.

Images