Anti-interference electronic prepayment electric energy meter

Abstract

The invention discloses an anti-interference electronic prepayment electric energy meter, and relates to the technical field of electric energy meters, the anti-interference electronic prepayment electric energy meter comprises a rear shell, the front end of the rear shell is buckled with a front shell, the interior of the rear shell is fixedly connected with a circuit board through bolts, and the front end of the circuit board is integrated with a display screen, a metering chip, a wireless communication module and an MCU controller; the air inlet and the air outlet which are obliquely formed are cooperatively matched with the cooling fan, an active convection channel is constructed, humid air is driven to actively and rapidly flow through the moisture absorption material in the dehumidification box, the contact area of the air and the moisture absorption material is increased, it is ensured that moisture is fully adsorbed, the humid state in equipment in a high-humidity area can be rapidly improved, and the service life of the equipment is prolonged. Meanwhile, the dehumidification box adopts a slot type drawing design, and is matched with a side door and a handle, so that moisture absorption materials can be conveniently observed, taken out or replaced without disassembling the equipment shell, the operation and maintenance difficulty and risk are reduced, and the maintenance efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of electricity meter technology, specifically to an anti-interference electronic prepaid electricity meter. Background Technology

[0002] Electronic prepaid electricity meters are power grid terminal devices that integrate electricity metering, prepaid top-up, and electricity control. Their core function is to accurately count electricity consumption, manage electricity consumption through a prepaid model, and protect the interests of both the power supplier and the electricity consumer.

[0003] Existing electronic prepaid energy meters typically employ built-in fixed absorbent cotton or small desiccant bags for dehumidification. They rely on the natural diffusion of humid air to contact the desiccant or absorbent cotton for dehumidification. However, the limited contact area of ​​these materials results in low dehumidification efficiency, making it difficult to quickly improve the internal humidity environment in high-humidity areas. Furthermore, the fixed design necessitates complete disassembly of the device casing for replacing the absorbent material, a cumbersome process that can damage internal components. In addition, while some existing energy meters incorporate shielding on the circuit board to resist electromagnetic interference, the shielding is often installed using welding or multiple bolts, requiring specialized tools for disassembly and reassembly, further complicating the process. Some products feature an integrated shielding cover covering all core modules; maintaining a single electronic component requires disassembling the entire shielding cover, potentially damaging circuit board solder joints. Therefore, this paper proposes an anti-interference electronic prepaid energy meter to address the aforementioned problems. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides an anti-interference electronic prepaid energy meter. This solution solves the problem mentioned in the background section where existing electronic prepaid energy meters rely on built-in fixed absorbent cotton or small desiccant bags for dehumidification. These rely on the natural diffusion of humid air to contact the desiccant or absorbent cotton for dehumidification. However, the limited contact area of ​​the absorbent cotton or small desiccant bags results in low dehumidification efficiency, making it difficult to quickly improve the internal humidity environment in high-humidity areas. Furthermore, the fixed structure design necessitates complete disassembly of the device casing for replacing the absorbent material, which is cumbersome and can easily damage internal components. In addition, while some existing energy meters have shielding covers on the circuit board to resist electromagnetic interference, these covers are often installed by welding or multiple bolts, requiring specialized tools for disassembly and reassembly, which is also cumbersome. Some products have an integrated shielding cover covering all core modules; maintaining a single electronic component requires disassembling the entire shielding cover, which can easily damage the circuit board solder joints.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An anti-interference electronic prepaid energy meter includes a rear shell, with a front shell fastened to the front end of the rear shell. A circuit board is bolted to the interior of the rear shell. The front end of the circuit board integrates a display screen, a metering chip, a wireless communication module, and an MCU controller. A clamping frame is provided at the front end of the circuit board. Clamping plates integrally formed with the clamping frame are fixedly connected to both ends of the clamping frame. A clamping groove is formed through the front end of each clamping plate, with the upper width of the groove being smaller than its lower width. Multiple shielding covers are fixedly connected to the inner side of the clamping frame. These shielding covers respectively cover the metering chip, the wireless communication module, and the MCU controller to reduce electromagnetic interference. The rear shell... A dehumidification chamber is provided on the right side. Multiple evenly distributed heat dissipation grooves are provided through the left inner wall of the dehumidification chamber. A slot is provided through the upper end of the rear shell. A dehumidification box is inserted into the slot. Multiple air outlets are provided on the left end of the dehumidification box. Multiple air inlets are provided on the right end of the dehumidification box. A receiving cavity for accommodating color-changing silica gel particles is provided between the multiple air outlets and multiple air inlets. A filter plate for limiting the color-changing silica gel particles is fixedly connected to the side of the receiving cavity near the air outlets and air inlets. The air outlets and air inlets are inclined towards the receiving cavity. The heat dissipation grooves are inclined towards the air outlets and the inlet of the heat dissipation grooves is aligned with the outlet of the air outlet.

[0006] Preferably, the rear end of the dehumidifier box is provided with a discharge port at the corresponding position of the multiple air outlets, and a cover plate is fastened to the rear end of the dehumidifier box. A sealing block with the same number of cavities as the cavities is fixedly connected to the side of the cover plate near the cavities, and the sealing block is inserted into the interior of the cavities.

[0007] Preferably, both the dehumidifier box and the filter plate are made of transparent acrylic. Positioning lines are provided at both ends of the dehumidifier box to assist in the quantitative filling of color-changing silica gel particles. A handle is fixedly connected to the top of the dehumidifier box. Multiple cavities are opened inside the dehumidifier box to reduce its weight.

[0008] Preferably, two cooling fans are fixedly installed on the left inner wall of the rear shell, and multiple evenly distributed exhaust ports are opened through the left end of the rear shell at the corresponding positions of the two cooling fans, and the multiple exhaust ports are opened at an angle towards the left end of the rear shell.

[0009] Preferably, a side door is hinged to the right end of the rear shell, a filter screen is fixedly connected to the inside of the side door, two symmetrically distributed limiting strips are fixedly connected inside the heat dissipation groove, and the dehumidification box is slidably connected between the limiting strips and the left inner wall of the dehumidification chamber.

[0010] Preferably, the rear inner wall of the rear shell is fixedly connected to two support columns. The front end of the support column is provided with a support groove for assisting the positioning of the circuit board. The front end of the support column is provided with a sliding groove. A sliding column is slidably connected inside the sliding groove. A push block is fixedly connected to the front end of the sliding column. Both ends of the push block are fixedly connected with locking blocks.

[0011] Preferably, the front ends of the push block and the locking block are provided with multiple evenly distributed strip-shaped anti-slip patterns, and the inner walls of the left and right sides of the sliding groove are provided with limit grooves. Limit blocks are fixedly connected inside the limit grooves, and the two limit blocks are fixedly connected to the outer surface of the sliding column.

[0012] Preferably, the sliding column is slidably connected inside the clamping groove, and the locking block is engaged with the front end of the clamping plate through the sliding cooperation between the sliding column and the clamping groove.

[0013] Preferably, four wiring holes are provided through the inner bottom of the rear shell, and a junction box is fixedly connected to the inner bottom of the rear shell.

[0014] Preferably, a protective window is embedded inside the rear shell, the protective window is located on the outside of the display screen, a labeling groove is opened at the front end of the rear shell, and a transparent protective shell is hinged to the inner side of the labeling groove.

[0015] The beneficial effects of this invention compared to the prior art are: This solution proposes an anti-interference electronic prepaid energy meter. Through the coordinated operation of angled air inlets and outlets with a cooling fan, an active convection channel is constructed. This allows humid air to flow actively and rapidly through the moisture-absorbing material within the dehumidification box, replacing traditional dehumidification methods that rely on natural diffusion. This significantly increases the contact area between the air and the moisture-absorbing material, ensuring that moisture is fully absorbed. It can quickly improve the internal humidity of equipment in high-humidity areas, effectively preventing short circuits and corrosion of electronic components caused by moisture. Furthermore, the dehumidification box features a slot-type pull-out design, along with a side door and handle, allowing for convenient observation, removal, or replacement of the moisture-absorbing material without disassembling the equipment casing. This reduces maintenance difficulty and risk, and improves maintenance efficiency.

[0016] In this solution, the shielding cover is integrated and fixed inside the clamping frame to form an integrated structure. With the wedge-shaped self-locking fixing mechanism of the clamping frame, no special tools are required for disassembly and assembly. The shielding cover and circuit board can be quickly separated and installed by simply pushing the push block. This avoids the damage to the circuit board solder joints caused by disassembling the whole when maintaining a traditional integrated shielding cover, ensuring the structural integrity of the circuit board and the shielding cover, and helping to extend the service life of the equipment.

[0017] In this solution, while actively dehumidifying, the cooling fan can also drive dry air to flow over the circuit board and the surface of electronic components, quickly removing the heat generated during operation, maintaining a dry and low-temperature operating environment inside the equipment, and avoiding the phenomenon of high temperature causing electronic component performance degradation, shortened lifespan, or thermal protection failure. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is an exploded view of the present invention; Figure 3 This is a schematic diagram of the rear shell structure in this invention; Figure 4 This is a schematic diagram of the installation of the junction box in this invention; Figure 5 This is a schematic diagram of the dehumidification box in this invention; Figure 6 for Figure 5 A magnified view of a portion of point A in the middle; Figure 7 This is a schematic diagram of the cavity structure in this invention; Figure 8 for Figure 7 A magnified view of a portion of point B in the middle; Figure 9 This is a schematic diagram of the positioning line structure in this invention; Figure 10 This is a schematic diagram of the circuit board structure in this invention; Figure 11 This is a schematic diagram of the clamping frame in this invention; Figure 12 This is a schematic diagram of the sliding column in this invention.

[0019] The numbers on the map are: 1. Rear shell; 101. Wiring hole; 2. Front shell; 3. Junction box; 4. Circuit board; 401. Display screen; 402. Metering chip; 403. Wireless communication module; 404. MCU controller; 5. Pressing frame; 501. Pressing plate; 502. Pressing groove; 6. Shielding cover; 7. Dehumidification chamber; 701. Heat dissipation groove; 8. Slot; 9. Dehumidification box; 901. Cavity; 902. Air outlet; 903. Air inlet; 904. Receiving cavity; 905. Filter plate; 906. Placement 907. Feed inlet; 908. Cover plate; 909. Sealing block; 910. Handle; 10. Positioning line; 11. Cooling fan; 11. Support column; 1101. Support groove; 1102. Slide groove; 1103. Sliding column; 1104. Push block; 1105. Locking block; 1106. Anti-slip texture; 1107. Limiting groove; 1108. Limiting block; 12. Exhaust port; 13. Side door; 14. Filter screen; 15. Limiting strip; 16. Protective window; 17. Labeling groove; 18. Transparent protective shell. Detailed Implementation

[0020] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0021] Reference Figures 1-4 and Figures 10-12 As shown, an anti-interference electronic prepaid energy meter includes a rear shell 1, with a front shell 2 fastened to the front end of the rear shell 1.

[0022] Specifically, both the rear shell 1 and the front shell 2 are made of flame-retardant and insulating plastic. A sealing ring is installed at the connection point. After the front shell 2 and the rear shell 1 are fastened together, the sealing ring at the edges forms a sealed protective cavity. This effectively prevents external dust, moisture, and corrosive gases from entering, protecting the internal precision electronic components from damage. It also reduces the interference of external electromagnetic radiation on the core module. The front shell 2 and the rear shell 1 are further secured with bolts after fastening. Furthermore, a circuit board 4 is fixedly connected to the interior of the rear shell 1 by bolts. The front end of the circuit board 4 integrates a display screen 401, a metering chip 402, a wireless communication module 403, and an MCU controller 404.

[0023] Specifically, four evenly distributed positioning posts are fixedly connected to the inner rear wall of the rear shell 1. The front end of the positioning posts has screw holes that correspond to the mounting holes at the four corners of the circuit board 4. By threading bolts into the screw holes and mounting holes at the four corners of the circuit board 4, the circuit board 4 can be fixed inside the rear shell 1. The circuit board 4 serves as the core functional carrier of the energy meter. The MCU controller 404 integrated on its surface is used to coordinate the collaborative work of various modules, receive metering data, process recharge information, and control the power supply. The metering chip 402 is used to collect grid voltage and current signals in real time and calculate the cumulative power consumption, instantaneous power, and other electrical energy through internal algorithms. The data and digital signals are continuously transmitted to the MCU controller 404. Simultaneously, if voltage overload, abnormal current, or metering fault is detected, an abnormal trigger signal is immediately sent to the MCU controller 404 to ensure timely fault response. The display screen 401 visually displays information such as remaining power, cumulative power consumption, recharge records, and fault prompts for user convenience. After receiving the energy data from the metering chip 402, the MCU controller 404 combines it with pre-stored remaining power information to calculate the real-time remaining power and the corresponding cost details based on the electricity rate. This information is then converted into display signals and sent to the display screen 401. The display screen 401 presents the information intuitively. The wireless communication module 403 receives recharge data and control commands from the remote platform and transmits the encrypted signals to the MCU controller 404. The MCU controller 404 decrypts and verifies the received recharge data. Upon successful verification, it updates the remaining battery information and sends a confirmation signal of successful recharge back to the wireless communication module 403, which then transmits it back to the remote platform. Simultaneously, the MCU controller 404 periodically summarizes data such as cumulative power consumption, remaining battery power, and device operating status, and uploads this data to the remote platform via the wireless communication module 403 for remote data monitoring. If a device malfunctions, the MCU controller 404 can also remotely monitor the device. The MCU controller 404 will report fault codes through the wireless communication module 403, facilitating remote troubleshooting by maintenance personnel. When the metering chip 402 detects that the remaining power is lower than the preset threshold, it will send a low power signal to the MCU controller 404. After receiving the signal, the MCU controller 404 will control the display screen 401 to show a warning message and send a balance warning message to the user's mobile phone or remote platform through the wireless communication module 403 to remind the user to recharge in time. If the balance is exhausted, the MCU controller 404 will trigger a power-off command and report the balance exhaustion status through the wireless communication module 403, thus realizing closed-loop power consumption control.

[0024] It should be noted that circuit board 4 also integrates a power module, main and backup memory, and backup memory. Specifically, the power module's input terminal is connected to the power supply terminal of junction box 3, and its output terminal is divided into multiple paths and connected to display screen 401, metering chip 402, wireless communication module 403, MCU controller 404, and main and backup memory respectively through voltage regulation circuits. This is used to convert the AC power input from the power grid into stable DC power adapted to each module. It also incorporates EMI filtering circuits and overvoltage, overcurrent, and short-circuit protection modules, which can filter out interference signals such as harmonics and spike pulses in the power grid, providing clean power to core electronic components. Furthermore, it can quickly cut off power supply in case of voltage abnormalities or circuit short circuits, preventing component burnout and improving the meter's anti-interference capability and power supply reliability. The main memory and backup memory are connected to MCU controller 404 and... The metering chip 402 is bidirectionally connected, and the two also communicate through a dedicated synchronization line. The main memory serves as the core storage medium, storing key data such as cumulative power consumption, remaining power, recharge records, electricity price parameters, fault codes, and equipment operation logs in real time. Data writing uses an encryption algorithm to prevent data tampering caused by external interference. The backup memory is synchronized with the main memory in real time. After each piece of data is written to the main memory, it is immediately copied to the backup memory through the synchronization line, forming a dual data backup to avoid data loss due to single memory failure or electromagnetic interference. At the same time, both support data verification functions. The MCU controller 404 periodically compares the key data in the main and backup memories. If inconsistencies are found, it automatically corrects the data based on the main memory or restores the correct data from the backup memory to ensure data integrity.

[0025] Furthermore, a clamping frame 5 is provided at the front end of the circuit board 4. A clamping plate 501 integrally formed with the clamping frame 5 is fixedly connected to both the left and right ends of the clamping frame 5. A clamping groove 502 is provided through the front end of the clamping plate 501. The width of the upper end of the clamping groove 502 is smaller than the width of its lower end. Two support columns 11 are fixedly connected to the rear inner wall of the rear shell 1. A support groove 1101 for assisting the positioning of the circuit board 4 is provided at the front end of the support column 11. A sliding groove 1102 is provided at the front end of the support column 11. A sliding column 1103 is slidably connected inside the sliding groove 1102. A push block 1104 is fixedly connected to the front end of the sliding column 1103. A locking block 1105 is fixedly connected to both the left and right ends of the push block 1104. The sliding column 1103 is slidably connected inside the clamping groove 502. The locking block 1105 is locked to the front end of the clamping plate 501 through the sliding cooperation of the sliding column 1103 and the clamping groove 502.

[0026] Specifically, the support column 11 is vertically fixed to the inner rear wall of the rear shell 1. Two support columns 11 are symmetrically distributed to provide stable support for the circuit board 4. The size of the support groove 1101 is adapted to the edge thickness of the circuit board 4. When the circuit board 4 is installed, it is embedded in the support groove 1101. The inner wall of the sliding groove 1102 is smoothed to ensure that the sliding column 1103 slides smoothly without jamming. The sliding column 1103, push block 1104, and locking block 1105 are integrally formed, resulting in high structural strength. The push block 1104 is easy for operators to press or push by hand, thereby driving the sliding column 1103 to slide in the sliding groove 1102, thus realizing the locking or separation of the locking block 1105 and the clamping plate 501. The structure is simple, the operation is convenient, and the installation of the clamping frame 5 can be completed without additional tools. The clamping frame 5 is customized according to the shape of the circuit board 4. The clamping groove 502 adopts a wedge-shaped structure that is wider at the top and narrower at the bottom. This facilitates the subsequent insertion of the sliding post 1103 from the wide end and creates a self-locking effect when sliding to the narrow end, improving the stability after the clamping. At the same time, the inner wall of the clamping groove 502 is smoothed to reduce the frictional resistance when the sliding post 1103 is inserted and slid, taking into account both assembly convenience and connection reliability. In addition, the clamping effect of the clamping frame 5 can further enhance the fixing effect of the circuit board 4. When the sliding post 1103 is inserted along the wide end of the clamping groove 502 and slides to the narrow end, the locking block 1105 is just locked at the front end of the clamping plate 501. By utilizing the wedge-shaped structure of the clamping groove 502 and the limiting effect of the locking block 1105, the clamping frame 5 can be quickly fixed.

[0027] It should be noted that the distance between the ends of the two locking blocks 1105 is the same as the width of the wide end of the clamping groove 502. The sliding column 1103 is initially located on the upper side of the sliding groove 1102. When installing the clamping frame 5, first align the wide end of the clamping groove 502 with the push block 1104 and the locking block 1105 so that the push block 1104 and the locking block 1105 pass through the wide end of the clamping groove 502. Then push the push block 1104 downward so that the locking block 1105 moves to the front side of the narrow end of the clamping groove 502, thereby restricting the clamping plate 501 from being fixed. The diameter of the sliding column 1103 is adapted to the width of the narrow end of the clamping groove 502. After being inserted into the narrow end of the clamping groove 502, it can fit tightly against the groove wall and avoid shaking.

[0028] Furthermore, the front ends of the push block 1104 and the locking block 1105 are provided with multiple evenly distributed strip-shaped anti-slip textures 1106, and the inner walls of the left and right sides of the slide groove 1102 are provided with limit grooves 1107. Limit blocks 1108 are fixedly connected inside the limit grooves 1107, and the two limit blocks 1108 are fixedly connected to the outer surface of the sliding column 1103.

[0029] Specifically, the strip-shaped anti-slip texture 1106 at the front end of the push block 1104 and the locking block 1105 can significantly increase the friction between the operator's hand and the surface of the component, preventing slippage when pressing or pushing, and improving the operating feel and stability. The limiting grooves 1107 on both sides of the slide groove 1102 are opened along the sliding direction. The limiting block 1108 and the sliding column 1103 are integrally formed, and their size is precisely matched with the limiting groove 1107, allowing them to slide smoothly within the limiting groove 1107. The limiting groove 1107 and the limiting block 1108 cooperate to effectively limit the sliding stroke of the sliding column 1103 and prevent the sliding column 1103 from disengaging from the slide groove 1102.

[0030] Furthermore, multiple shielding covers 6 are fixedly connected to the inner side of the clamping frame 5. The multiple shielding covers 6 are respectively placed on the outside of the metering chip 402, the wireless communication module 403 and the MCU controller 404 to reduce electromagnetic interference.

[0031] Specifically, the shielding cover 6 is made of brass or stainless steel with excellent conductivity. Utilizing the electromagnetic shielding principle of metal, it blocks the penetration of external electromagnetic signals and isolates the electromagnetic radiation interference between the internal core modules. A layer of conductive foam is attached to the inner wall of the shielding cover 6 to fill the tiny gap between the shielding cover 6 and the circuit board 4, eliminating electromagnetic leakage channels, improving the shielding effect, and also acting as a buffer to prevent component damage caused by hard contact between the shielding cover 6 and the circuit board 4. Each shielding cover 6 individually covers one core module, achieving zoned shielding and specifically protecting the metering chip 402, the wireless communication module 403, and the MCU controller 404. The shielding cover 6 is fixed to the inside of the clamping frame 5 by welding, working in conjunction with the clamping frame 5 to achieve the shielding function without affecting the disassembly and maintenance of the circuit board 4.

[0032] Reference Figures 1-9 As shown, a dehumidification chamber 7 is provided on the right side of the rear shell 1. Multiple evenly distributed heat dissipation grooves 701 are provided through the left inner wall of the dehumidification chamber 7. A slot 8 is provided through the upper end of the rear shell 1. A dehumidification box 9 is inserted into the slot 8. Multiple air outlets 902 are provided on the left end of the dehumidification box 9. Multiple air inlets 903 are provided on the right end of the dehumidification box 9. A receiving cavity 904 for accommodating color-changing silica gel particles is provided between the multiple air outlets 902 and the multiple air inlets 903. A filter plate 905 for limiting the color-changing silica gel particles is fixedly connected to the side of the receiving cavity 904 near the air outlets 902 and the air inlets 903. The air outlets 902 and the air inlets 903 are inclined towards the receiving cavity 904. The heat dissipation grooves 701 are inclined towards the air outlets 902 and the inlet of the heat dissipation grooves 701 is aligned with the outlet of the air outlets 902.

[0033] Specifically, the dehumidification chamber 7 provides independent installation space for the dehumidification box 9. The dehumidification box 9 is installed via a pull-out plug-in design using slot 8, allowing for quick assembly and disassembly without tools, facilitating regular maintenance. The receiving chamber 904 is used to fill color-changing silica gel particles. Color-changing silica gel is an indicator adsorbent with high added value and high technological content, made from fine-pored silica gel with high activity as the base material. It has the characteristic of changing color after absorbing moisture; it is blue when not absorbing moisture and gradually turns pink as moisture absorption continues. Users can intuitively judge the moisture absorption status by observing the color of the color-changing silica gel particles. The filter plate 905 effectively prevents the color-changing silica gel particles from falling from the air outlet 902 or air inlet 903, preventing particles from entering the interior of the rear shell 1 and contaminating the circuit board 4 or jamming components. The air inlet 90... Both the inlet 903 and the outlet 902 are inclined toward the receiving cavity 904, forming a one-way airflow channel. This guides external air into the receiving cavity 904 through the inlet 903. After the silica gel absorbs the moisture, the air then enters the interior of the rear shell 1 through the outlet 902 and the heat dissipation groove 701, continuously reducing the internal air humidity. This prevents the circuit board 4 and electronic components from short-circuiting, corroding, or other malfunctions due to moisture, ensuring the stable operation of the electricity meter in a humid environment. The inclination direction of the heat dissipation groove 701 is consistent with the airflow discharge direction of the outlet 902, and the inlet of the heat dissipation groove 701 is precisely aligned with the outlet of the outlet 902. This reduces the airflow resistance at the connection point, allowing the dry air in the dehumidification box 9, after being absorbed by the silica gel, to be discharged through the outlet 902 and directly enter the heat dissipation groove 701, quickly flowing into the core area inside the rear shell 1.

[0034] Furthermore, a discharge port 906 is provided through the rear end of the dehumidification box 9 at the corresponding position of the multiple air outlets 902. A cover plate 907 is fastened to the rear end of the dehumidification box 9. A sealing block 908, the same number as the receiving cavity 904, is fixedly connected to the side of the cover plate 907 near the receiving cavity 904. The sealing block 908 is inserted into the inside of the receiving cavity 904.

[0035] Specifically, the opening of the discharge port 906 facilitates quick filling or replacement of color-changing silica gel granules. The cover plate 907 adopts a snap-on design, which is convenient to open and close. After snapping, it fits tightly with the rear end of the dehumidification box 9. The sealing block 908 is made of elastic rubber material, and its shape is precisely matched with the internal contour of the receiving cavity 904. After being inserted, it can tightly fill the gap at the end of the receiving cavity 904, achieving a reliable seal and preventing silica gel granules from leaking from the discharge port 906.

[0036] Furthermore, both the dehumidifier box 9 and the filter plate 905 are made of transparent acrylic. Positioning lines 910 are provided at both ends of the dehumidifier box 9 to assist in the quantitative filling of color-changing silica gel particles. A handle 909 is fixedly connected to the upper end of the dehumidifier box 9. Multiple cavities 901 are opened inside the dehumidifier box 9 to reduce the weight of the dehumidifier box 9.

[0037] Specifically, the transparent acrylic material allows light to pass through, enabling users to directly observe the color change of the silicone through the box and promptly determine if replacement is necessary without disassembling the dehumidifier box 9. The positioning line 910 is a raised or printed positioning line used to mark the maximum limit of silicone filling, assisting operators in quantitative filling and ensuring uniform silicone filling in each cavity 904, avoiding overfilling that could affect airflow. The handle 909 adopts an integrated molding design with a non-slip surface, making it easy for operators to grip and pull out the dehumidifier box 9, improving maintenance convenience. The cavities 901 are evenly distributed in non-critical areas inside the dehumidifier box 9, significantly reducing the overall weight of the dehumidifier box 9 without affecting the capacity of the cavities 904 or obstructing the airflow channel, thus reducing the load on the slots 8 and dehumidifier 7, and consequently reducing the overall weight of the electricity meter.

[0038] It should be noted that since the color-changing silica gel particles will expand slightly after absorbing moisture, the positioning line 910 is set to mark the maximum limit of silica gel filling. Within this range, even if the color-changing silica gel particles expand after absorbing moisture, they will not completely block the receiving cavity 904, thereby ensuring that dry air can stably enter the interior of the rear shell 1.

[0039] Furthermore, two cooling fans 10 are fixedly installed on the inner left side of the rear shell 1. Multiple evenly distributed exhaust ports 12 are provided at the corresponding positions of the two cooling fans 10 on the left end of the rear shell 1. The multiple exhaust ports 12 are all inclined towards the left end of the rear shell 1.

[0040] Specifically, two cooling fans 10 are symmetrically installed on the left inner wall of the rear shell 1, forming a convection channel with the right dehumidification chamber 7. When the cooling fans 10 are running, they can accelerate the air circulation inside the rear shell 1, causing dry cold air from the outside to flow into the rear shell 1 through the heat dissipation slot 701. At the same time, they can accelerate the discharge of humid hot air inside the rear shell 1 from the left exhaust port 12, forming a continuous cooling airflow. This effectively reduces the temperature inside the rear shell 1 and prevents high temperature from causing performance degradation, shortening of lifespan, or thermal protection failure of electronic components. The exhaust port 12 is opened at an angle, which not only ensures smooth discharge of cooling airflow but also uses the angle to block external dust and rainwater from entering the interior of the rear shell 1. Multiple exhaust ports 12 are evenly distributed to ensure uniform heat dissipation and avoid high temperature accumulation caused by local airflow obstruction.

[0041] Furthermore, a side door 13 is hinged to the right end of the rear shell 1, and a filter screen 14 is fixedly connected to the inside of the side door 13. Two symmetrically distributed limiting strips 15 are fixedly connected inside the heat dissipation slot 701, and the dehumidification box 9 is slidably connected between the limiting strips 15 and the left inner wall of the dehumidification chamber 7.

[0042] Specifically, the side door 13 is hinged to the rear shell 1, allowing for flexible opening and closing. When open, the moisture absorption of the dehumidification box 9 can be observed directly. When closed, it is secured by a buckle or magnetic attraction, fitting tightly against the rear shell 1. The filter screen 14 inside the side door 13 filters the air entering the dehumidification chamber 7, intercepting dust and particulate matter and other impurities in the air. This prevents impurities from entering the rear shell 1 with the airflow and contaminating the circuit board 4, clogging the heat dissipation groove 701, or wearing out electronic components, thereby extending the service life of the equipment. The limiting strips 15 inside the heat dissipation groove 701 are made of hard plastic and are symmetrically distributed in a long strip shape. They provide stable sliding guidance for the dehumidification box 9, ensuring that the dehumidification box 9 can be accurately aligned with the air outlet 902 and the heat dissipation groove 701 during installation, avoiding installation misalignment that could cause airflow blockage.

[0043] Furthermore, four wiring holes 101 are provided through the bottom inner side of the rear shell 1, and a junction box 3 is fixedly connected to the bottom inner side of the rear shell 1.

[0044] Specifically, the four wiring holes 101 correspond to phase line input, phase line output, neutral line input, and neutral line output, respectively. The layout is neat and clearly marked, facilitating the connection of external power grid wires. The edges of the wiring holes 101 are rounded to prevent the insulation layer from being scratched by sharp edges when the wires are connected, thus avoiding short circuit faults. The junction box 3 is made of flame-retardant insulating material and has terminal blocks inside for centralized fixing and connecting wires, isolating the wiring area from the electronic components inside the rear shell 1. This avoids the risk of wire tangling and short circuits caused by messy wiring, and also protects the wiring terminals from dust and moisture corrosion, improving the safety and reliability of the wiring.

[0045] Furthermore, a protective window 16 is embedded inside the rear shell 1, which covers the outside of the display screen 401. A labeling groove 17 is opened at the front end of the rear shell 1, and a transparent protective shell 18 is hinged to the inner side of the labeling groove 17.

[0046] Specifically, the protective window 16 is made of tempered glass or acrylic and is tightly embedded in the front end of the rear shell 1. It can clearly display the content of the display screen 401 and effectively protect the display screen 401 from external collisions, scratches and dust pollution, thus extending the service life of the display screen 401. The labeling slot 17 is a recessed design, used to affix labels such as product identification, parameter specifications and associated device identity information and remote management program QR codes of the energy meter. The recessed structure can prevent the labels from protruding and being worn or scratched. The transparent protective shell 18 is connected to the inside of the labeling slot 17 by a hinge, which can be opened and closed flexibly. When closed, it can completely cover the label, which can play a role in dustproofing, waterproofing and wear resistance, while not affecting the viewing of the label information. When opened, it is convenient to replace the label or affix a new calibration certificate, which balances protection and practicality. The transparent protective shell 18 is closed by buckles and fastened in the labeling slot 17 to prevent accidental opening.

[0047] Working Principle: After the electricity meter is connected to the power grid, the power module supplies power to all components. The MCU controller 404 starts a self-test program, sequentially checking the working status of core components such as the metering chip 402, wireless communication module 403, and display screen 401. Simultaneously, it verifies the data integrity of the main and backup memory. If any data was not saved before the power outage, it is automatically restored synchronously from the backup memory. The wireless communication module 403 automatically searches for and connects to the remote monitoring platform, establishes a stable communication link after authentication, and reports the device's power-on status. The metering chip 402 collects the grid voltage and current signals connected through the junction box 3 in real time. After filtering harmonic interference through an internal anti-interference algorithm, it calculates core data such as cumulative electricity consumption and instantaneous power, continuously transmitting digital signals to the MCU controller. The device 404 simultaneously monitors for fault states such as voltage overload and abnormal current in real time. Once an abnormality is detected, it immediately sends a trigger signal. After receiving the metering data, the MCU controller 404 calculates the real-time remaining power and cost details based on the pre-stored electricity price parameters, converts the data into a display signal, and sends it to the display screen 401 for intuitive presentation through the protective window 16. At the same time, it synchronously stores data such as cumulative power consumption, remaining power, and operating status in the main and backup memory to ensure that the data is not lost. Users can issue recharge commands through a remote platform. The wireless communication module 403 receives the encrypted signal, decrypts it, and submits it to the MCU controller 404. After verifying the legality of the recharge data, the MCU controller 404 updates the remaining power information, sends a notification to the user that the recharge was successful, and stores the recharge record. When the device is powered on, the MCU controller 404 compares the remaining power with a preset threshold in real time. If the remaining power is sufficient, the power supply circuit remains open, allowing normal power consumption. If the remaining power is below the threshold, a low power warning is triggered, and the display screen 401 shows the warning. The wireless communication module 403 sends a reminder to the user's mobile phone or remote platform. When the remaining power is depleted, the MCU controller 404 triggers a power-off command, cutting off the power supply circuit and simultaneously reporting to the remote platform. Power is restored only after the user recharges. Throughout the entire process of electricity metering and prepaid management, the shielding cover 6 forms a closed protection system through the metal shell and conductive foam, blocking external electromagnetic radiation from entering and isolating the metering chip 402, wireless communication module 403, and MCU controller 404. Magnetic coupling interference is prevented to ensure measurement accuracy and communication stability. External air, after being filtered for impurities by the filter screen 14 inside the side door 13, enters the dehumidification chamber 7 and flows into the receiving cavity 904 of the dehumidification box 9 through the air inlet 903. There, it comes into contact with the color-changing silica gel particles, where moisture is adsorbed. The dried air is then discharged through the air outlet 902 into the interior of the rear shell 1, continuously reducing internal humidity and preventing electronic components from getting damp. Simultaneously, the cooling fan 10 starts, forming a convection channel with the dehumidification chamber 7. The dry air flows over the circuit board 4 and the surface of the electronic components, carrying away the heat generated during operation. The hot air is discharged through the inclined exhaust port 12 on the left side. This coordinated operation of humidity control and heat dissipation maintains a dry and low-temperature environment inside the rear shell 1, preventing equipment malfunctions due to moisture or high temperatures. If a malfunction occurs during operation...The MCU controller 404 immediately records the fault code and controls the display screen 401 to show the fault message. Simultaneously, it reports the fault to the remote platform via the wireless communication module 403, facilitating remote troubleshooting by maintenance personnel. During normal operation, the MCU controller 404 periodically summarizes data such as cumulative power consumption, remaining power, recharge records, and equipment status. This data is encrypted by the wireless communication module 403 and uploaded to the remote platform. The remote platform can issue commands for parameter adjustment, remote recharge, and fault troubleshooting, enabling remote management of the entire equipment lifecycle. All metering data, recharge records, and fault information are stored in the main and backup memory, supporting historical data retrieval via the remote platform. Historical data shows that the QR code in the labeling slot 17 can be linked to equipment information, achieving a one-to-one correspondence between equipment identity and data, facilitating traceability management. When maintaining the dehumidifier box 9, the user can open the side door 13 and observe the color-changing silica gel through the transparent dehumidifier box 9. If it turns pink, the user can pull out the dehumidifier box 9 using the handle 909, open the cover 907, and replace the silica gel through the discharge port 906. When filling the color-changing silica gel granules, the user can fill them quantitatively according to the positioning line 910 to ensure the effectiveness of the dehumidifier box 9. After filling the color-changing silica gel granules, the user can close the cover 907, seal the receiving cavity 904 with the sealing block 908, and then reinsert the dehumidifier box 9 into the dehumidifier cavity 7.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. An anti-interference electronic prepaid energy meter, characterized in that, The device includes a rear shell (1), with a front shell (2) fastened to the front end of the rear shell (1). A circuit board (4) is fixedly connected to the interior of the rear shell (1) by bolts. The front end of the circuit board (4) integrates a display screen (401), a metering chip (402), a wireless communication module (403), and an MCU controller (404). A clamping frame (5) is provided at the front end of the circuit board (4). A clamping plate (501) integrally formed with the clamping frame (5) is fixedly connected to both the left and right ends of the clamping frame (5). A clamping groove (502) is opened through the front end of the clamping plate (501). The width of the upper end of the clamping groove (502) is smaller than the width of its lower end. Multiple shielding covers (6) are fixedly connected to the inner side of the clamping frame (5). The multiple shielding covers (6) are respectively placed on the outside of the metering chip (402), the wireless communication module (403), and the MCU controller (404) to reduce electromagnetic interference. A dehumidification chamber (7) is opened on the right side of the rear shell (1) for dehumidification. Multiple evenly distributed heat dissipation grooves (701) are provided through the left inner wall of the cavity (7). A slot (8) is provided through the upper end of the rear shell (1). A dehumidifying box (9) is inserted into the slot (8). Multiple air outlets (902) are provided on the left end of the dehumidifying box (9). Multiple air inlets (903) are provided on the right end of the dehumidifying box (9). A container for accommodating color-changing silica gel particles is provided between the multiple air outlets (902) and the multiple air inlets (903). The cavity (904) has a filter plate (905) fixedly connected to the side of the cavity (904) near the air outlet (902) and the air inlet (903) for limiting the color-changing silica gel particles. The air outlet (902) and the air inlet (903) are both opened at an angle towards the cavity (904). The heat dissipation groove (701) is opened at an angle towards the air outlet (902) and the inlet of the heat dissipation groove (701) is aligned with the outlet of the air outlet (902).

2. The anti-interference electronic prepaid energy meter according to claim 1, characterized in that: The dehumidifier box (9) has a discharge port (906) through it at the corresponding position of the multiple air outlets (902). The dehumidifier box (9) has a cover plate (907) fastened to its rear end. The cover plate (907) has a sealing block (908) fixedly connected to the side of the receiving cavity (904) with the same number of sealing blocks (908) as the receiving cavity (904). The sealing blocks (908) are inserted into the inside of the receiving cavity (904).

3. The anti-interference electronic prepaid energy meter according to claim 1, characterized in that: The dehumidifier box (9) and filter plate (905) are both made of transparent acrylic. Positioning lines (910) are provided at both ends of the dehumidifier box (9) to assist in the quantitative filling of color-changing silica gel particles. A handle (909) is fixedly connected to the upper end of the dehumidifier box (9). Multiple cavities (901) are opened inside the dehumidifier box (9) to reduce the weight of the dehumidifier box (9).

4. The anti-interference electronic prepaid energy meter according to claim 1, characterized in that: Two cooling fans (10) are fixedly installed on the left inner wall of the rear shell (1). Multiple evenly distributed exhaust ports (12) are opened through the left end of the rear shell (1) and the corresponding positions of the two cooling fans (10). The multiple exhaust ports (12) are opened at an angle towards the left end of the rear shell (1).

5. The anti-interference electronic prepaid energy meter according to claim 1, characterized in that: The right end of the rear shell (1) is hinged with a side door (13), and a filter screen (14) is fixedly connected to the inside of the side door (13). Two symmetrically distributed limiting strips (15) are fixedly connected inside the heat dissipation groove (701). The dehumidification box (9) is slidably connected between the limiting strips (15) and the left inner wall of the dehumidification chamber (7).

6. The anti-interference electronic prepaid energy meter according to claim 1, characterized in that: The rear inner wall of the rear shell (1) is fixedly connected to two support columns (11). The front end of the support column (11) is provided with a support groove (1101) for positioning the circuit board (4). The front end of the support column (11) is provided with a sliding groove (1102). The sliding groove (1102) is slidably connected to a sliding column (1103). The front end of the sliding column (1103) is fixedly connected to a push block (1104). Both the left and right ends of the push block (1104) are fixedly connected to a locking block (1105).

7. The anti-interference electronic prepaid energy meter according to claim 6, characterized in that: The front ends of the push block (1104) and the locking block (1105) are provided with multiple evenly distributed strip-shaped anti-slip patterns (1106). The inner walls of the left and right sides of the slide groove (1102) are provided with limiting grooves (1107). The limiting grooves (1107) are fixedly connected to the inside of the limiting blocks (1108). The two limiting blocks (1108) are fixedly connected to the outer surface of the sliding column (1103).

8. The anti-interference electronic prepaid energy meter according to claim 6, characterized in that: The sliding column (1103) is slidably connected to the inside of the pressing groove (502), and the locking block (1105) is locked to the front end of the pressing plate (501) through the sliding cooperation of the sliding column (1103) and the pressing groove (502).

9. The anti-interference electronic prepaid energy meter according to claim 1, characterized in that: The bottom inner side of the rear shell (1) has four wiring holes (101) and a junction box (3) is fixedly connected to the bottom inner side of the rear shell (1).

10. The anti-interference electronic prepaid energy meter according to claim 1, characterized in that: The rear shell (1) is fitted with a protective window (16) inside. The protective window (16) covers the outside of the display screen (401). The front end of the rear shell (1) is provided with a labeling groove (17). A transparent protective shell (18) is hinged to the inside of the labeling groove (17).

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