Electric energy meter with module fixing structure

Abstract

The application relates to the technical field of intelligent electric energy meters, and particularly discloses an electric energy meter with a module fixing structure, wherein the upper cover and the end button cover are connected in an integrated mode, the components are disassembled as a whole, the cumbersome steps of respectively disassembling the upper cover and the end button cover are omitted, and the maintenance process is greatly simplified. Meanwhile, the module cover plate and the quick disassembly structure thereof are used to quickly fix and protect the communication module, the upper cover can drive the locking structure to stably press the two side edges of the main circuit board on the bottom shell in the process of being quickly combined with the bottom shell through the connecting structure, and finally, the synchronous and efficient quick installation and fixing of the main circuit board, the communication module and the meter shell are realized, and the assembling and maintenance efficiency of the electric energy meter is remarkably improved.

Description

Technical Field

[0001] This application relates to the field of smart energy meter technology, and in particular to an energy meter with a fixed module structure. Background Technology

[0002] As a specialized instrument for measuring electrical energy, the electricity meter is a core device for trade settlement, energy efficiency management, and load monitoring in the power system, and it has been widely used in all aspects of social production and residential life. With the in-depth advancement of smart grid construction, single-phase smart electricity meters, due to their multiple functions such as data storage, real-time monitoring, and information interaction, have become the mainstream device for collecting electricity consumption information.

[0003] Currently, a typical single-phase smart meter usually consists of a base casing, a terminal cover, a top cover, and internal functional modules. During installation, the base casing is first secured to the mounting bracket with screws, followed by electrical connections. When the internal functional modules require maintenance or replacement, technicians must use tools to sequentially remove the screws securing the terminal cover and top cover to open the casing and access the internal functional modules. These modules are often also secured to the corresponding positions on the base casing with additional screws or clips, requiring tools for disassembly as well.

[0004] Because the disassembly and assembly of the aforementioned smart meters requires the disassembly and reassembly of multiple screws and components layer by layer, the process is cumbersome and time-consuming. This not only directly increases the time cost of on-site repairs and module replacements, reducing maintenance efficiency, but also increases workload and safety risks due to frequent screw handling in confined or poorly lit working environments. Therefore, the existing structure of the smart meters, to some extent, restricts the need for rapid response and fault handling, necessitating a more convenient module fixing structure to solve this problem. Summary of the Invention

[0005] To facilitate the maintenance of the internal modules of an electricity meter and solve the problems of complex disassembly and assembly processes and time-consuming repairs, this application provides an electricity meter with a module-fixed structure.

[0006] This application provides an energy meter with a modular fixed structure, which adopts the following technical solution: An energy meter with a modular fixing structure includes a bottom shell, a top cover, and an end cap integrally connected to the top cover. The bottom shell has a snap-fit ​​structure for snapping onto a main circuit board. The top cover has a slot for snapping onto a communication module. The wiring terminals of the communication module pass through the slot and are electrically connected to the main circuit board. The top cover has a movable module cover plate for pressing and snapping onto the communication module. A quick-release structure is provided between the module cover plate and the top cover. The bottom shell is provided with two sets of positioning structures for fixing the two sides of the main circuit board to the bottom shell. A connecting structure for quick connection between the top cover and the bottom shell is provided. A quick-release structure is provided between the end cover and the bottom shell. A locking structure is provided on the top cover. The locking structure locks the positioning structure when the connecting structure fixes the top cover and the bottom shell.

[0007] By adopting the above technical solution, the top cover and end cap are integrated, allowing the component to be assembled and disassembled as a single unit. This eliminates the tedious steps of separately disassembling the top cover and end cap when maintaining the communication module or main circuit board, greatly simplifying the operation process. Simultaneously, the snap-fit ​​structure within the bottom shell provides initial support and positioning for the main circuit board, while the slot on the top cover for engaging the communication module enables pre-positioning and rapid electrical connection between the communication module and the main circuit board. Furthermore, the module cover and its quick-release structure enable rapid fixation and protection of the communication module. Through the synergistic action of the two sets of positioning structures, connecting structures, and locking structures, the locking structure, driven by the quick connection between the top cover and the bottom shell, firmly presses the two sides of the main circuit board against the bottom shell. This ultimately achieves simultaneous and efficient rapid installation and fixation of the main circuit board, communication module, and meter casing, significantly improving the assembly and maintenance efficiency of the electricity meter.

[0008] Optionally, the snap-fit ​​structure includes fixing posts that are fixed to the four corners of the main circuit board within the bottom shell, and snap-fit ​​platforms formed by hollowing out the ends of each fixing post. Each snap-fit ​​platform supports the main circuit board, and the inner wall of the fixing post where each snap-fit ​​platform is located limits the four corners of the main circuit board.

[0009] By adopting the above technical solution, the fixing column and the snap-fit ​​platform formed by hollowing out its end provide stable and precise support and limit for the four corners of the main circuit board, so that the main circuit board can be quickly and accurately pre-positioned on each snap-fit ​​platform when it is put into the bottom shell. The inner wall of the fixing column prevents its horizontal movement, so that the main circuit board can be installed without any tools and fasteners during the initial installation, simplifying the assembly process and laying a reliable foundation for the subsequent positioning structure to finally press and fix it.

[0010] Optionally, the positioning structure includes a rotating rod, a plug-in post, and an elastic element. One end of the rotating rod is rotatably mounted inside the bottom shell and the rotating end is located outside the main circuit board. The other end of the rotating rod can rotate to the inside of the main circuit board. The plug-in post is slidably inserted into the end of the rotating rod away from the rotating axis and both ends pass through the rotating rod. The rotating rod and the plug-in post are parallel to each other. The elastic element is installed between the rotating rod and the plug-in post and is used to provide a force for the plug-in post to move towards the main circuit board. Mounting holes are provided on the surface of the main circuit board near both sides. Mounting posts are fixed on the bottom shell corresponding to the two mounting holes. The top of the mounting post is provided with a plug-in hole corresponding to the mounting hole. When the end of the rotating rod rotates to the mounting hole, the end of the plug-in post is plugged into the mounting hole and the plug-in hole respectively.

[0011] By adopting the above technical solution, the positioning structure can switch the position of the plug-in post between being far from and near the inside of the main circuit board through the rotation of the rotating rod, thus providing operating space for installation and disassembly. When the rotating rod rotates to the inside of the main circuit board, under the action of the elastic element, the plug-in post is continuously subjected to a force towards the main circuit board and is inserted into the mounting holes of the main circuit board and the plug-in holes of the mounting posts on the bottom shell. This process facilitates the insertion of the plug-in post into the hole position through the rotation of the rotating rod, and automatically eliminates the assembly gap with the help of the elastic force of the elastic element, achieving reliable fixation on one side of the main circuit board. Moreover, this fixing method is simple to operate and requires no tools.

[0012] Optionally, the connection structure includes sliding grooves formed on both sides of the bottom shell and snap-fit ​​strips fixed on both sides of the top cover. The two snap-fit ​​strips are slidably adapted to the corresponding sliding grooves, and the top cover can be slidably installed on the bottom shell. The locking structure can lock the position of the main circuit board when the top cover and the bottom shell are closed.

[0013] By adopting the above technical solution, the snap-fit ​​strips on both sides of the top cover and the sliding grooves on both sides of the bottom shell slide against each other, allowing the top cover to be easily pushed into or pulled out of the bottom shell, achieving quick and aligned closing and separation between the top cover and the bottom shell. This sliding connection method is more convenient to operate than the traditional method of fixing with screws on all four sides. At the same time, this sliding process provides the conditions for triggering the locking structure. When the top cover slides to the fully closed position, the locking structure can be automatically triggered, thereby achieving final locking of the main circuit board position and ensuring the stability of the overall structure.

[0014] Optionally, the locking structure includes a wedge-shaped block fixed to the inner wall of the upper cover. The diameter of the plug-in post is different at the end near the main circuit board, and the diameter gradually increases from the end near the main circuit board to the end away from the main circuit board. The wedge-shaped block can press the end of the plug-in post when the upper cover slides and closes along the bottom shell, so that the end of the plug-in post near the main circuit board abuts and fixes the main circuit board and the corresponding end of the mounting post together.

[0015] By adopting the above technical solution, the locking structure utilizes a wedge-shaped block fixed to the inner wall of the upper cover. During the sliding closing process of the upper cover along the bottom shell, the inclined surface of the wedge-shaped block interferes with the conical surface of the plug-in post near the main circuit board, generating a pressing action. Since the diameter of this end of the plug-in post gradually increases from near to far, this pressing action forces the plug-in post to overcome the force of the elastic element and slightly retract away from the main circuit board. The direct effect is that the end of the plug-in post acts like a wedge, tightly pressing the main circuit board against the end of the mounting post. Thus, while the connection structure completes the closing, it automatically achieves the final pressing and locking of the main circuit board, effectively preventing the main circuit board from loosening.

[0016] Optionally, the quick-release structure includes a screwing part and a fixing part integrally connected to the screwing part. A limiting post is fixed on the side wall of the fixing part. The module cover and the upper cover are both provided with mutually communicating fixing holes. Guide grooves are provided on the inner walls of the two fixing holes corresponding to the limiting posts. A locking groove is provided on the inner wall of the fixing hole at the upper cover. The locking groove is connected to the end of the guide groove at the upper cover. The depth of the locking groove gradually narrows from near the guide groove to away from the guide groove. The fixing part can drive the limiting post to be inserted into the guide groove and the locking groove in sequence.

[0017] By adopting the above technical solution, the quick-release structure uses a screwing part to drive the fixing part and its limiting post to rotate, allowing the limiting post to slide into the locking groove along the guide groove. Since the depth of the locking groove gradually narrows from near to far, as the limiting post enters the locking groove during rotation, the module cover is continuously pulled upwards, making the connection between the two increasingly tighter and ultimately achieving a secure lock. This process only requires a simple rotation operation to complete the installation and removal of the module cover, without any tools, greatly facilitating the maintenance and replacement of the communication module.

[0018] In summary, this application includes at least one of the following beneficial technical effects: 1. This application fundamentally changes the traditional maintenance mode of electricity meters, which requires the disassembly of multiple outer casing components, by setting the top cover and the end button cover as an inseparable integrated connecting component. This allows maintenance personnel to handle only a unified outer casing unit when performing any internal operation, greatly simplifying the operation entry point and laying a structural foundation for achieving rapid maintenance. 2. This application transforms the physical closing action of the top cover and bottom shell into a driving force for the final clamping and fixing of the internal main circuit board. Specifically, through the cooperation of the wedge-shaped block set on the inner wall of the top cover and the plug-in column in the rotatable positioning structure inside the bottom shell, the plug-in column is automatically driven to complete the clamping and locking of the main circuit board during the process of the top cover sliding into the closing, using the principle of inclined plane extrusion. This greatly reduces the difficulty of installation and disassembly and significantly improves the reliability and efficiency of assembly.

[0019] 3. This application features a quick-release structure with a specific guide groove and a progressively deeper locking groove. By simply rotating the screw part on the module cover, the movement trajectory of the limiting post within the groove can easily achieve the pressing and releasing of the module cover, making the exposure and removal of the communication module much simpler. For the positioning structure on the main circuit board side, the design of its rotating rod and plug-in post also allows for manual rotation and unlocking, eliminating the reliance on special tools such as screwdrivers, greatly reducing the difficulty of operation and significantly improving maintenance efficiency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the electricity meter in this embodiment; Figure 2 yes Figure 1 China Electricity Meter displays a schematic diagram of the communication module's structure; Figure 3 yes Figure 1 Schematic diagram of the bottom shell of the China Electricity Meter; Figure 4 yes Figure 3 A structural diagram of the middle and bottom shells and the positioning structure at the bottom shell; Figure 5 Figure 1 A schematic diagram of the internal structure of the top cover of the China Electricity Meter; Figure 6 yes Figure 1 A schematic diagram of the structure of the top cover of the electricity meter when it is open.

[0022] Reference numerals: 1. Bottom shell; 11. Mounting post; 111. Insertion hole; 2. Top cover; 21. End cap; 22. Slot; 23. Module cover plate; 24. Fixing hole; 25. Communication module; 3. Snap-fit ​​structure; 31. Fixing post; 32. Snap-fit ​​platform; 4. Quick-release structure; 41. Twisting part; 42. Fixing part; 43. Limiting post; 5. Positioning structure; 51. Rotating rod; 52. Insertion post; 53. Elastic element; 6. Connecting structure; 61. Slide groove; 62. Snap-fit ​​strip; 7. Wedge block; 8. Main circuit board; 81. Mounting hole. Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail below.

[0024] This application discloses an energy meter with a modular fixed structure.

[0025] Reference Figure 1 , Figure 2 and Figure 3 An energy meter with a modular fixing structure includes a bottom shell 1, a top cover 2, and an end cap 21 integrally connected to the top cover 2. The bottom shell 1 is provided with a snap-fit ​​structure 3 for snapping on the main circuit board 8. The top cover 2 is provided with a slot 22 for snapping on the communication module 25. The wiring terminals of the communication module 25 pass through the slot 22 and are electrically connected to the main circuit board 8. The top cover 2 is movably covered with a module cover plate 23 for pressing and snapping on the communication module 25. A quick-release structure 4 is provided between the module cover plate 23 and the top cover 2. The bottom shell 1 is provided with two sets of positioning structures 5 for fixing the two sides of the main circuit board 8 to the bottom shell 1. The top cover 2 and the bottom shell 1 are provided with a connecting structure 6 for quick connection between the two. The end cover 21 and the bottom shell 1 are provided with a quick release structure 4. The top cover 2 is provided with a locking structure. When the connecting structure 6 fixes the top cover 2 and the bottom shell 1, the locking structure locks the positioning structure 5.

[0026] By integrating the top cover 2 and the end cap 21, the component can be assembled and disassembled as a single unit. This eliminates the tedious steps of separately disassembling the top cover 2 and the end cap 21 when maintenance of the communication module 25 or the main circuit board 8 is required, greatly simplifying the operation process. Simultaneously, the snap-fit ​​structure 3 within the bottom shell 1 provides initial support and positioning for the main circuit board 8. Combined with the snap-fit ​​slot 22 on the top cover 2 for engaging the communication module 25, pre-positioning and rapid electrical connection between the communication module 25 and the main circuit board 8 are achieved. Furthermore, the module cover 23 and its quick-release structure 4 enable rapid fixation and protection of the communication module 25.

[0027] In this embodiment, through the synergistic effect of two sets of positioning structures 5, connecting structures 6 and locking structures, the upper cover 2 can drive the locking structure to firmly press the two sides of the main circuit board 8 onto the bottom shell 1 during the rapid combination of the connecting structure 6 and the bottom shell 1. This ultimately achieves the synchronous and efficient rapid installation and fixation of the main circuit board 8, the communication module 25 and the meter shell, significantly improving the assembly and maintenance efficiency of the electricity meter.

[0028] Reference Figure 3 and Figure 4 The snap-fit ​​structure 3 includes fixing posts 31 that are fixed to the four corners of the main circuit board 8 in the bottom shell 1 and snap-fit ​​platforms 32 formed by hollowing out the ends of each fixing post 31. Each snap-fit ​​platform 32 supports the main circuit board 8, and the inner wall of the fixing post 31 where each snap-fit ​​platform 32 is located limits the four corners of the main circuit board 8.

[0029] The fixing post 31 and the snap-fit ​​platform 32 formed by hollowing out its end provide stable and precise support and limit for the four corners of the main circuit board 8, so that the main circuit board 8 can be quickly and accurately pre-positioned on each snap-fit ​​platform 32 when it is put into the bottom shell 1. The inner wall of the fixing post 31 prevents it from moving horizontally. This allows the main circuit board 8 to be installed without any tools or fasteners, simplifying the assembly process and laying a reliable foundation for the subsequent positioning structure 5 to finally press and fix it.

[0030] In order to make it easier for the main circuit board 8 to pop out automatically after the top cover 2 is removed, an elastic pad is also attached to the snap-fit ​​platform 32. The pad material can be rubber or the like.

[0031] Specifically, refer to Figure 3 and Figure 4 The positioning structure 5 includes a rotating rod 51, a plug-in post 52, and an elastic element 53. One end of the rotating rod 51 is rotatably mounted inside the bottom shell 1 and the rotating end is located outside the main circuit board 8. The other end of the rotating rod 51 can rotate to the inside of the main circuit board 8. The plug-in post 52 is slidably inserted into the end of the rotating rod 51 away from the rotating shaft and both ends pass through the rotating rod 51. The rotating rod 51 and the plug-in post 52 are parallel to each other. The elastic element 53 is installed between the rotating rod 51 and the plug-in post 52 and is used to provide a force for the plug-in post 52 to move towards the main circuit board 8.

[0032] Reference Figure 3 and Figure 4 Mounting holes 81 are provided on the surface of the main circuit board 8 near both sides. Mounting posts 11 are fixed on the bottom shell 1 corresponding to the two mounting holes 81. The top of the mounting post 11 is provided with a plug hole 111 corresponding to the mounting hole 81. When the end of the plug hole 52 rotates to the mounting hole 81 at the end of the rotating rod 51, it is plugged into the mounting hole 81 and the plug hole 111 respectively.

[0033] The positioning structure 5, through the rotation of the rotating rod 51, allows the insertion post 52 to switch between positions away from and close to the inner side of the main circuit board 8, thus providing operational space for installation and disassembly. When the rotating rod 51 rotates to the inner side of the main circuit board 8, under the action of the elastic element 53, the insertion post 52 is continuously subjected to a force towards the main circuit board 8 and inserted into the mounting hole 81 of the main circuit board 8 and the insertion hole 111 of the mounting post 11 on the bottom shell 1. This process facilitates the insertion post 52 into the hole position through the rotation of the rotating rod 51, and automatically eliminates the assembly gap with the help of the elastic force of the elastic element 53, achieving reliable fixation on one side of the main circuit board 8. This fixing method is simple to operate and requires no tools.

[0034] Reference Figure 5 and Figure 6 The connecting structure 6 includes sliding grooves 61 on both sides of the bottom shell 1 and snap-fit ​​strips 62 fixed on both sides of the top cover 2. The two snap-fit ​​strips 62 are slidably adapted to the corresponding sliding grooves 61, and the top cover 2 can be slidably installed on the bottom shell 1. The locking structure can lock the position of the main circuit board 8 when the top cover 2 and the bottom shell 1 are closed.

[0035] The snap-fit ​​strips 62 on both sides of the top cover 2 and the sliding grooves 61 on both sides of the bottom shell 1 slide against each other, allowing the top cover 2 to be easily pushed into or pulled out of the bottom shell 1, achieving quick and aligned closing and separation between the top cover 2 and the bottom shell 1. This sliding connection method is more convenient to operate than the traditional method of fixing with screws on all four sides. At the same time, this sliding process provides the conditions for triggering the locking structure. When the top cover 2 slides to the fully closed position, the locking structure can be automatically triggered, thereby achieving final locking of the main circuit board 8 and ensuring the stability of the overall structure.

[0036] Reference Figure 3 and Figure 5 The locking structure includes a wedge block 7 fixed on the inner wall of the upper cover 2. The diameter of the insertion post 52 near the main circuit board 8 is different, and the diameter gradually increases from the end near the main circuit board 8 to the end away from the main circuit board 8. The wedge block 7 can press the end of the insertion post 52 when the upper cover 2 slides along the bottom shell 1 to make the end of the insertion post 52 near the main circuit board 8 abut and fix the main circuit board 8 and the end of the corresponding mounting post 11 together.

[0037] The locking structure utilizes a wedge-shaped block 7 fixed to the inner wall of the upper cover 2. During the sliding closing process of the upper cover 2 along the bottom shell 1, the inclined surface of the wedge-shaped block 7 interferes with the conical surface of the plug post 52 near the main circuit board 8 and generates a pressing action. Since the diameter of this end of the plug post 52 gradually increases from near to far, this pressing action forces the plug post 52 to overcome the force of the elastic element 53 and move slightly away from the main circuit board 8. The direct effect is that the end of the plug post 52 acts like a wedge, tightly pressing the main circuit board 8 against the end of the mounting post 11. Thus, while the connecting structure 6 is closing, the final pressing and locking of the main circuit board 8 is automatically achieved, effectively preventing the main circuit board 8 from loosening.

[0038] Another wedge block 7 is fixed on the inner wall of the upper cover 2. This wedge block 7 can be used to press the press-type detection probe on the main circuit board. The function of this detection probe is to record the number of times the energy meter is turned on. This wedge block 7 can remove the pressure force on the detection probe when the upper cover 2 is removed, so that the detection probe can record normally.

[0039] Reference Figure 5 The quick-release structure 4 includes a screwing part 41 and a fixing part 42 integrally connected to the screwing part 41. A limiting post 43 is fixed on the side wall of the fixing part 42. The module cover plate 23 and the upper cover 2 are both provided with interconnected fixing holes 24. The inner walls of the two fixing holes 24 are provided with guide grooves corresponding to the limiting post 43. The inner wall of the fixing hole 24 at the upper cover 2 is provided with a locking groove. The locking groove is connected to the end of the guide groove at the upper cover 2. The depth of the locking groove gradually narrows from near the guide groove to away from the guide groove. The fixing part 42 can drive the limiting post 43 to be inserted into the guide groove and the locking groove in sequence.

[0040] The quick-release structure 4, through the screwing part 41, drives the fixing part 42 and its limiting post 43 to rotate, allowing the limiting post 43 to slide into the locking groove along the guide groove. Since the depth of the locking groove gradually narrows from near to far, as the limiting post 43 enters the locking groove during rotation, the module cover 23 is continuously pulled upwards towards the cover 2, making the connection between the two increasingly tighter, ultimately achieving a secure lock. This process requires only a simple rotation operation to install and remove the module cover 23, without any tools, greatly facilitating the maintenance and replacement of the communication module 25.

[0041] The implementation principle of an energy meter with a modular fixing structure in this application embodiment is as follows: During assembly, the main circuit board 8 is first placed on the snap-fit ​​structure 3 of the bottom shell 1 for pre-positioning, and its two sides are initially limited by the rotating rod 51 of the positioning structure 5 and the plug-in post 52. Subsequently, the integrated top cover 2, on which the communication module 25 is installed, is pushed into the sliding groove 61 of the bottom shell 1 through the snap-fit ​​strips 62 on both sides. During this sliding process, the wedge-shaped block 7 on the inner wall of the top cover 2 will contact and press the conical end of the plug-in post 52. This interaction forces the plug-in post 52 to slightly retract to make room, and its reaction force presses the main circuit board 8 tightly against the mounting post 11 of the bottom shell 1 through the plug-in post 52. Thus, at the moment the sliding action is completed, the final clamping and fixing of the main circuit board 8 is automatically achieved. Finally, the quick-release structure 4 of the rotating module cover 23, through the movement of the limiting post 43 within the guide groove and locking groove, securely presses the communication module 25 onto the upper cover 2, fixing the end cap 21 and the upper cover 2 onto the bottom shell 1. The entire workflow integrates multiple independent fastening steps into a coherent linear operation, achieving efficient, reliable, and user-friendly assembly and maintenance.

[0042] The above are all optional 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. An energy meter with a modular fixed structure, characterized in that: The device includes a bottom shell (1), a top cover (2), and an end cap (21) integrally connected to the top cover (2). The bottom shell (1) is provided with a snap-fit ​​structure (3) for snapping the main circuit board (8). The top cover (2) is provided with a slot (22) for snapping the communication module (25). The wiring terminals of the communication module (25) pass through the slot (22) and are electrically connected to the main circuit board (8). The top cover (2) is movably covered with a module cover plate (23) for pressing and snapping the communication module (25). A quick-release structure (4) is provided between the module cover plate (23) and the top cover (2). The bottom shell (1) is provided with two sets of positioning structures (5) for fixing the two sides of the main circuit board (8) to the bottom shell (1). The top cover (2) and the bottom shell (1) are provided with a connecting structure (6) for quick connection between the two. The end cover (21) and the bottom shell (1) are provided with a quick-release structure (4). The top cover (2) is provided with a locking structure. The locking structure locks the positioning structure (5) when the connecting structure (6) fixes the top cover (2) and the bottom shell (1).

2. The energy meter with a modular fixed structure according to claim 1, characterized in that: The snap-fit ​​structure (3) includes fixing posts (31) that are fixed to the four corners of the main circuit board (8) in the bottom shell (1) and snap-fit ​​platforms (32) formed by hollowing out the ends of each fixing post (31). Each snap-fit ​​platform (32) supports the main circuit board (8), and the inner wall of the fixing post (31) where each snap-fit ​​platform (32) is located limits the four corners of the main circuit board (8).

3. An energy meter with a modular fixed structure according to claim 1, characterized in that: The positioning structure (5) includes a rotating rod (51), a plug-in post (52), and an elastic element (53). One end of the rotating rod (51) is rotatably mounted inside the bottom shell (1) and the rotating end is located outside the main circuit board (8). The other end of the rotating rod (51) can rotate to the inside of the main circuit board (8). The plug-in post (52) is slidably inserted into the end of the rotating rod (51) away from the rotating axis and both ends pass through the rotating rod (51). The rotating rod (51) and the plug-in post (52) are parallel to each other. The elastic element (53) is installed between the rotating rod (51) and the plug-in post (52) and is used to provide the plug-in post (52) with a force to move towards the main circuit board (8). The main circuit board (8) has mounting holes (81) on its surface near both sides. The bottom shell (1) has mounting posts (11) fixed on the two mounting holes (81). The top of the mounting post (11) has a plug hole (111) corresponding to the mounting hole (81). When the end of the plug hole (52) rotates to the mounting hole (81), it is plugged into the mounting hole (81) and the plug hole (111) respectively.

4. An energy meter with a modular fixed structure according to claim 1, characterized in that: The connection structure (6) includes sliding grooves (61) on both sides of the bottom shell (1) and snap-fit ​​strips (62) fixed on both sides of the top cover (2). The two snap-fit ​​strips (62) are slidably adapted to the corresponding sliding grooves (61), and the top cover (2) can be slidably installed on the bottom shell (1). The locking structure can lock the position of the main circuit board (8) when the top cover (2) and the bottom shell (1) are closed.

5. An energy meter with a modular fixed structure according to claim 3, characterized in that: The locking structure includes a wedge block (7) fixed to the inner wall of the upper cover (2). The diameter of the plug post (52) near the main circuit board (8) is different, and the diameter gradually increases from the side near the main circuit board (8) to the side away from the main circuit board (8). The wedge block (7) can press the end of the plug post (52) when the upper cover (2) slides along the bottom shell (1) to make the end of the plug post (52) near the main circuit board (8) abut and fix the main circuit board (8) and the end of the corresponding mounting post (11) together.

6. An energy meter with a modular fixed structure according to claim 1, characterized in that: The quick-release structure (4) includes a screwing part (41) and a fixing part (42) integrally connected to the screwing part (41). A limiting post (43) is fixed on the side wall of the fixing part (42). The module cover (23) and the upper cover (2) are provided with mutually communicating fixing holes (24). The inner walls of the two fixing holes (24) are provided with guide grooves corresponding to the limiting post (43). The inner wall of the fixing hole (24) at the upper cover (2) is provided with a locking groove. The locking groove is connected to the end of the guide groove at the upper cover (2). The depth of the locking groove gradually narrows from near the guide groove to away from the guide groove. The fixing part (42) can drive the limiting post (43) to be inserted into the guide groove and the locking groove in sequence.

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