Electric energy meter based on shunt
By designing a closed accommodation chamber and electrical isolation plate in the power meter, the problem of difficult to ensure the safety of electrical energy metering is solved, and data security and accuracy are achieved.
Patent Information
- Application Number
- CN202421392474.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-17
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-06-17
AI Technical Summary
In the metering and billing of DC charging of existing power meters, the safety of power meters is difficult to guarantee and is susceptible to human tampering or interference from external environment.
A shunt-based electrical energy meter is designed, and the data safety and accuracy are ensured by placing the sampling module and the metering module in a closed storage cavity and electrically isolating it with an isolation plate.
It improves the safety of power metering, prevents data tampering and external interference, and ensures the accuracy and authenticity of metered data.
Smart Images
Figure CN223038045U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electric energy metering, and particularly relates to an electric energy meter based on a shunt. Background Art
[0002] With the increasing application of electric vehicles, electric energy meters have also been widely used in the metering and charging of DC charging. Existing electric energy meters include electronic metering meters and shunts. The electronic metering meters are used for signal input and data display. By externally connecting the shunt to the load loop for current and voltage sampling, the metering of electric energy is realized, and then the cost is displayed through the electronic metering meter.
[0003] However, for such an electric energy meter with a separate metering and detection setting, data can be modified separately for the shunt or the metering meter, resulting in the inability to guarantee the safety of electric energy metering of the electric energy meter. Summary of the Utility Model
[0004] The main object of the utility model is to propose an electric energy meter based on a shunt, aiming to improve the safety of electric energy metering of the electric energy meter based on a shunt.
[0005] To achieve the above object, the electric energy meter based on a shunt proposed by the utility model includes:
[0006] A first housing;
[0007] A second housing, fixedly connected to the first housing, and enclosing a receiving cavity with the first housing;
[0008] A metering module, disposed in the receiving cavity, the metering module including a main control board and a display unit electrically connected to the main control board;
[0009] A sampling module, disposed in the receiving cavity, the sampling module including a signal acquisition unit, a shunt electrically connected to the signal acquisition unit, and a voltage terminal block. The signal acquisition unit is electrically connected to the main control board and can transmit the acquired current signal and voltage signal to the main control board;
[0010] An isolation board, disposed in the receiving cavity and between the main control board and the signal acquisition unit.
[0011] In an embodiment, the signal acquisition unit includes a first circuit board. The shunt is disposed in the second housing and on a side surface of the first circuit board away from the isolation board. The shunt includes a positive terminal and a negative terminal respectively disposed at two opposite ends of the first circuit board. Two opposite relief holes are formed between the first housing and the second housing. The positive terminal and the negative terminal pass through the corresponding relief holes.
[0012] In one embodiment, the voltage terminal is disposed on a side of the first circuit board away from the shunt. The voltage terminal includes a fastener and a terminal post disposed on the first circuit board. The terminal post is provided with a first wire passing hole and a mounting hole that communicate with each other, and the fastener is disposed in the mounting hole. A second wire passing hole and an operation window that communicate with the accommodation cavity are formed in the first housing corresponding to the terminal post. The voltage terminal is exposed through the operation window, and the second wire passing hole is disposed corresponding to the first wire passing hole.
[0013] In one embodiment, the voltage terminal is disposed close to the negative terminal. An insulating baffle is convexly provided on the inner wall of the second housing. The insulating baffle is disposed between the terminal post and the negative terminal and extends along the extending direction of the terminal post. The first circuit board is provided with a relief groove for the insulating baffle to pass through.
[0014] In one embodiment, a display window is formed on a side of the first housing away from the second housing. The display unit includes a second circuit board and a display screen electrically connected to the second circuit board. The main control board is disposed between the isolation board and the second circuit board. The second circuit board is electrically connected to the main control board. The display screen is disposed on a side of the second circuit board away from the main control board and is exposed through the display window.
[0015] In one embodiment, both the second circuit board and the main control board are provided with a plurality of limiting holes. The electricity meter based on the shunt further includes a plurality of limiting buckles disposed on the inner wall of the first housing. The limiting buckles pass through and are buckled to the limiting holes.
[0016] In one embodiment, the size of the second circuit board in the length direction of the electricity meter based on the shunt is smaller than the size of the main control board. Some of the limiting buckles pass through the limiting holes on the second circuit board, and some of the limiting buckles are respectively disposed on both sides of the second circuit board in the length direction of the electricity meter based on the shunt and pass through the limiting holes on the main control board.
[0017] In one embodiment, a plurality of limiting ribs are provided on the inner wall of the first housing. The plurality of limiting ribs are respectively disposed on both sides of the second circuit board in the length direction of the electricity meter based on the shunt. The limiting ribs extend along the direction from the main control board to the isolation board, and the width of the limiting ribs gradually decreases in the direction from the main control board to the isolation board. The limiting ribs are provided with card slots, and the isolation board is provided with notch slots corresponding to the card slots. The card slots and the notch slots are inserted and connected to each other.
[0018] In one embodiment, the first housing has a first end face close to the second housing, a first step portion is provided at the edge of the first end face, the second housing has a second end face close to the first housing, a second step portion is provided at the edge of the second end face, the first step portion abuts against the second end face, and the second step portion abuts against the first end face.
[0019] In one embodiment, ultrasonic welding is used between the first housing and the second housing.
[0020] The technical solution of the present utility model enables the electricity meter based on the shunt to have both sampling and metering functions by arranging the sampling module and the metering module in the accommodation cavity formed by the fixed connection of the first housing and the second housing. At the same time, under the protection of the first housing and the second housing, the risk of data of the sampling module and the metering module being tampered with artificially or the interference of the external environment on the sampling module and the metering module is reduced, thereby improving the security of the internal components and metering data of the electricity meter based on the shunt and ensuring the accuracy and authenticity of the metering data of the electricity meter based on the shunt. Description of the Drawings
[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.
[0022] Figure 1 It is an exploded view of an embodiment of the electricity meter based on the shunt provided by the present utility model;
[0023] Figure 2 It is Figure 1 a partial enlarged view of part A in
[0024] Figure 3 It is Figure 1 a partial enlarged view of part B in
[0025] Figure 4 It is a sectional view of an embodiment of the electricity meter based on the shunt provided by the present utility model;
[0026] Figure 5 It is Figure 1 an exploded view of the first housing and the second housing in
[0027] Figure 6 It is Figure 5 a partial enlarged view of part C in
[0028] Figure 7 It isFigure 5 Partial enlarged view at position D in the figure.
[0029] Explanation of the reference numerals in the attached drawings:
[0030] 10. Shunt-based electric energy meter; 100. First housing; 200. Second housing; 300. Display unit; 400. Main control board; 500. Signal acquisition unit; 600. Shunt; 700. Voltage terminal; 800. Isolation board; 900. Limit buckle; 110. First end face; 120. First step portion; 130. Second wire passing hole; 140. Operation window; 150. Display window; 160. Limit rib; 161. Card slot; 210. Second end face; 220. Second step portion; 230. Relief hole; 240. Insulating baffle; 310. Second circuit board; 320. Display screen; 510. First circuit board; 511. Relief groove; 610. Positive terminal; 620. Negative terminal; 710. Terminal; 711. First wire passing hole; 712. Mounting hole; 720. Fastener; 810. Notch groove.
[0031] The realization, functional features and advantages of the purpose of the present utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners
[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.
[0033] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0034] In addition, if the descriptions such as "first", "second", etc. are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0035] The present utility model provides an electricity meter 10 based on a shunt.
[0036] Please refer to Figure 1 and Figure 4 In an embodiment of the present utility model, the electricity meter 10 based on a shunt includes a first housing 100, a second housing 200, a metering module, a sampling module, and a partition board 800. The second housing 200 is fixedly connected to the first housing 100 and encloses a receiving cavity with the first housing 100. The metering module is disposed in the receiving cavity and includes a main control board 400 and a display unit 300 electrically connected to the main control board 400. The sampling module is disposed in the receiving cavity and includes a signal acquisition unit 500, a shunt 600 electrically connected to the signal acquisition unit 500, and a voltage terminal 700. The signal acquisition unit 500 is electrically connected to the main control board 400 and can transmit the acquired current signal and voltage signal to the main control board 400. The partition board 800 is disposed in the receiving cavity and between the main control board 400 and the signal acquisition unit 500.
[0037] Specifically, the first housing 100 and the second housing 200 form the outer shell of the electricity meter 10 based on a shunt, and a relatively closed receiving cavity is formed through fixed connection. The metering module, the sampling module, and the partition board 800 are all installed in the receiving cavity. The receiving cavity provides physical protection for its internal components and at the same time prevents external interference from affecting the metering accuracy.
[0038] The metering module is used to output digital data which is converted into actual electrical energy by a metering chip after sampling voltage and current. The metering module includes a main control board 400 and a display unit 300. The main control board 400 is responsible for processing all the collected data, performing electrical energy calculation and controlling the display unit 300 to display relevant data; the main control board 400 also has a storage function and can store data such as the parameters of the shunt-based electricity meter 10, electricity consumption and historical data. The display unit 300 is used to display relevant data of the shunt-based electricity meter 10 such as electricity consumption, which can intuitively show the electricity consumption situation and facilitate users to understand the electricity usage status at any time. The metering module accurately obtains the real-time parameters in the load circuit, processes the data according to requirements such as corresponding rates, stores its processing results, and displays the data through the display unit 300, or provides information or conducts data exchange processing with an external network.
[0039] The sampling module includes a signal acquisition unit 500, a shunt 600 and a voltage terminal block 700. The signal acquisition unit 500 is responsible for acquiring current signals and voltage signals. The shunt 600 is used to convert a large current into a small current suitable for processing by the signal acquisition unit 500. The voltage terminal block 700 is used to connect to the voltage signal in the circuit. The signal acquisition unit 500 transmits the acquired current signals and voltage signals to the main control board 400 for processing through electrical connection with the main control board 400. It can be understood that the load current is connected to the shunt-based electricity meter 10 through the current terminal block and flows through the shunt 600, causing the shunt 600 to generate a voltage signal proportional to the load current. The load voltage is connected to the shunt-based electricity meter 10 through the voltage terminal block 700, and the signal acquisition unit 500 transmits the acquired current signals and voltage signals to the main control board 400 for the main control board 400 to perform electrical energy metering.
[0040] The isolation board 800 is located between the main control board 400 and the signal acquisition unit 500 and plays a role of electrical isolation. The isolation board 800 can increase the creepage distance between the main control board 400 and the signal acquisition unit 500, prevent high voltage or large current from directly acting on the main control board 400, protect the main control board 400 from damage, and ensure the long-term stable operation of the shunt-based electricity meter 10. The isolation board 800 is made of high-temperature-resistant non-metallic insulating materials such as rubber, plastic, ceramic, etc.
[0041] By arranging the sampling module and the metering module in the accommodation cavity and using the partition board 800 to separate the main control board 400 and the signal acquisition unit 500, the traditional way of using the electronic meter and the current sampling device independently arranged is changed. Through optimized design, the sampling module and the metering module are integrated into one, so that the shunt-based electric energy meter 10 has both sampling and metering functions. Moreover, since the first housing 100 and the second housing 200 that form the accommodation cavity are fixedly connected, it is difficult to disassemble the shunt-based electric energy meter 10 in a non-violent manner. Therefore, it is difficult to modify the data of the sampling module and the metering module, thus avoiding the metering data of the shunt-based electric energy meter 10 from being tampered with, improving the security of the metering data of the shunt-based electric energy meter 10, and ensuring the accuracy and authenticity of the metering data of the shunt-based electric energy meter 10.
[0042] The technical solution of the present utility model arranges the sampling module and the metering module in the accommodation cavity formed by the fixed connection of the first housing 100 and the second housing 200, so that the shunt-based electric energy meter 10 has both sampling and metering functions. At the same time, under the protection of the first housing 100 and the second housing 200, the risk of the data of the sampling module and the metering module being tampered with by humans or the interference of the external environment on the sampling module and the metering module is reduced, thereby improving the security of the internal components and metering data of the shunt-based electric energy meter 10, and ensuring the accuracy and authenticity of the metering data of the shunt-based electric energy meter 10.
[0043] In an embodiment, the signal acquisition unit 500 includes a first circuit board 510. The shunt 600 is arranged in the second housing 200 and on a side surface of the first circuit board 510 away from the partition board 800. The shunt 600 includes a positive terminal 610 and a negative terminal 620 respectively arranged at opposite ends of the first circuit board 510. Two opposite relief holes 230 are formed between the first housing 100 and the second housing 200, and the positive terminal 610 and the negative terminal 620 pass through the corresponding relief holes 230.
[0044] Please refer to Figure 1 and Figure 7 , the first circuit board 510, as the core component, undertakes the important tasks of signal acquisition and preliminary processing. The first circuit board 510 is responsible for collecting current signals and voltage signals and performing analog-to-digital conversion on the signals and transferring them to the main control board 400. The first circuit board 510 is electrically connected to the main control board 400 through an electrical connector, and the electrical connector can be a flexible circuit board, a wire, a probe connector, etc.
[0045] The shunt 600 is disposed within the second housing 200 and on the side of the first circuit board 510 away from the isolation board 800, ensuring electrical isolation between the signal acquisition unit 500 and the main control board 400 and avoiding potential damage to sensitive electronic components by high current. The shunt 600 is soldered to the first circuit board 510. The shunt 600 includes a positive terminal 610 and a negative terminal 620 respectively disposed at both ends of the first circuit board 510. The positive terminal 610 and the negative terminal 620 are used to introduce the current in the external load circuit into the electricity meter 10 based on the shunt for measurement. The positive terminal 610 and the negative terminal 620 are connected by an alloy resistor. The positive terminal 610 is connected to the positive terminal of the load circuit, and the negative terminal 620 is connected to the negative terminal of the load circuit. When the current is input from the positive terminal 610, the value of the electricity meter 10 based on the shunt is positive, and at this time, the electricity meter 10 based on the shunt is charging; when the current is input from the negative terminal 620, the value of the electricity meter 10 based on the shunt is negative, and at this time, the electricity meter 10 based on the shunt is discharging.
[0046] There are two opposite relief holes 230 formed between the first housing 100 and the second housing 200. The positive terminal 610 and the negative terminal 620 pass through the corresponding relief holes 230 to be connected to the external circuit. This design not only simplifies the installation process and improves the assembly efficiency but also ensures the stable connection between the signal acquisition unit 500 and the external circuit, avoiding signal distortion or measurement errors caused by poor connection.
[0047] In addition, the relief hole 230 can be formed in the first housing 100, or in the second housing 200, or partially in the first housing 100 and partially in the second housing 200. The design of the relief hole 230 also takes into account electrical safety and protection performance. By precisely controlling the aperture size, it not only ensures the smooth passing of the terminals but also prevents the intrusion of foreign objects or moisture, further enhancing the safety of the electricity meter 10 based on the shunt.
[0048] In an embodiment, the voltage connection terminal 700 is disposed on a side surface of the first circuit board 510 away from the shunt 600. The voltage connection terminal 700 includes a fastener 720 and a connection post 710 disposed on the first circuit board 510. The connection post 710 is provided with a first wire passing hole 711 and a mounting hole 712 that communicate with each other, and the fastener 720 is disposed in the mounting hole 712; the first housing 100 is correspondingly provided with a second wire passing hole 130 and an operation window 140 that communicate with the accommodation cavity corresponding to the connection post 710. The voltage connection terminal 700 is exposed in the operation window 140, and the second wire passing hole 130 is correspondingly arranged with the first wire passing hole 711.
[0049] Please refer to Figure 1 and Figure 2, the voltage terminal 700 serves as the voltage acquisition terminal for voltage measurement of the shunt-based energy meter 10. It is located on the side of the first circuit board 510 away from the shunt 600, which helps to avoid mutual interference between voltage signals and current signals, maintain the purity of the signals, and thus improve the accuracy and reliability of the measurement.
[0050] The voltage terminal 700 includes a fastener 720 and a terminal post 710. The terminal post 710 is directly soldered to the first circuit board 510 and is provided with a first wire passing hole 711 and a mounting hole 712 that are connected. The first wire passing hole 711 allows external wires to pass through, facilitating the connection of external wires to the terminal post 710; the mounting hole 712 is used to fix the fastener 720 to ensure the reliability of the connection of external wires. The fastener 720 is used to fix the external wire to the terminal post 710, usually in the form of screws, nuts or spring clips, etc., to ensure a firm connection between the external wire and the terminal post 710 and prevent poor contact caused by vibration or external forces.
[0051] The first wire passing hole 711 is located on the terminal post 710, while the second wire passing hole 130 is opened on the first housing 100 and is correspondingly arranged with the first wire passing hole 711, so that the external wire can enter from the second wire passing hole 130 and pass through the first wire passing hole 711 to be connected to the terminal post 710, which not only ensures the smoothness of the electrical connection but also maintains the sealing performance and protection level of the shunt-based energy meter 10. The operation window 140 is an opening on the first housing 100, which exposes a part of the voltage terminal 700, facilitating the user to perform the connection operation of the external wire and the disassembly and installation of the fastener 720.
[0052] In addition, an independent cavity can be separated in the accommodation cavity for the terminal post 710 to pass through. Through physical isolation and electrical isolation measures, the mutual interference between voltage and current signals is effectively avoided, and the measurement accuracy is improved; at the same time, external water vapor and sundries are also prevented from entering the accommodation cavity through the operation window 140 and affecting other components inside. A flip cover can also be provided on the operation window 140 to block the operation window 140 and prevent the terminal post 710 from being exposed.
[0053] In an embodiment, the voltage terminal 700 is arranged close to the negative terminal 620. The inner wall of the second housing 200 is convexly provided with an insulating baffle 240. The insulating baffle 240 is arranged between the terminal post 710 and the negative terminal 620 and extends along the extending direction of the terminal post 710. The first circuit board 510 is provided with a relief groove 511 for the insulating baffle 240 to pass through.
[0054] Please refer to Figure 1 and Figure 2, the voltage terminal 700 is arranged close to the negative terminal 620. The voltage terminal 700 serves as the terminal for collecting the positive voltage and shares the negative terminal 620 with the shunt 600. That is to say, the negative terminal 620 is both the negative connection end of the load circuit and the negative acquisition terminal for voltage measurement of the voltmeter. In this way, one negative terminal 620 can be saved and the overall structure can be simplified.
[0055] To further improve the electrical safety inside the shunt-based electricity meter 10 and enhance the isolation effect between the current signal and the voltage signal, a physical isolation is achieved by arranging an insulating baffle 240 on the inner wall of the second housing 200. The insulating baffle 240 protrudes from the inner wall of the second housing 200 and is located between the terminal post 710 of the voltage terminal 700 and the negative terminal 620, extending along the extension direction of the terminal post 710. It can effectively cut off the direct electrical path between the voltage terminal 700 and the negative terminal 620, preventing short circuits or electrical faults caused by accidental contact. To ensure that the installation of the insulating baffle 240 does not affect the normal layout of the first circuit board 510, a relief groove 511 is provided on the first circuit board 510 to allow the insulating baffle 240 to pass through, enabling the insulating baffle 240 to better cut off the direct electrical path between the voltage terminal 700 and the negative terminal 620 and improving the electrical isolation effect of the insulating baffle 240.
[0056] The insulating baffle 240 is usually made of high-strength insulating materials such as polycarbonate (PC), polytetrafluoroethylene (PTFE), etc. It has excellent electrical insulation performance and mechanical strength, can withstand a certain amount of mechanical stress while ensuring electrical isolation, and improves the durability of the shunt-based electricity meter 10.
[0057] In an embodiment, a display window 150 is provided on a side surface of the first housing 100 away from the second housing 200. The display unit 300 includes a second circuit board 310 and a display screen 320 electrically connected to the second circuit board 310. The main control board 400 is arranged between the isolation board 800 and the second circuit board 310. The second circuit board 310 is electrically connected to the main control board 400. The display screen 320 is arranged on a side of the second circuit board 310 away from the main control board 400 and is exposed through the display window 150.
[0058] Please refer to Figure 1 and Figure 4The display unit 300 includes a second circuit board 310 and a display screen 320 electrically connected thereto. The second circuit board 310 carries electronic components driving the display screen 320, such as a controller, a driver IC, etc., and the display screen 320 is the main interface for users to interact with the shunt-based electric energy meter 10, and displays various important information such as electric energy consumption, time, date, etc. A display window 150 is provided on a side of the first shell 100 away from the second shell 200. The display screen 320 is installed on a side of the second circuit board 310 away from the main control board 400 and exposed in the display window 150, ensuring that users can directly observe the information on the display screen 320, thereby improving the intuitiveness and convenience of information reading.
[0059] The display unit 300 also includes components such as a switch button, an infrared transceiver and an electric pulse transmitter. The switch button is exposed on the second shell 200 and is used to wake up the screen of the display screen 320, query and switch various data, etc.; the infrared transceiver and the electric pulse transmitter are used to copy data, upload data, send data, etc.
[0060] The main control board 400 is located between the isolation board 800 and the second circuit board 310, which can ensure effective isolation between the main control board 400 and the signal acquisition unit 500, and can also ensure close connection with the display unit 300, reducing signal delay and loss. The shunt-based electric energy meter 10 can not only realize accurate data collection and processing, but also provide users with a clear and intuitive display interface, greatly improving the user experience and the practicality of the device.
[0061] In one embodiment, the second circuit board 310 and the main control board 400 are both provided with a plurality of limiting holes, and the shunt-based electric energy meter 10 also includes a plurality of limiting buckles 900 provided on the inner wall of the first shell 100, and the limiting buckles 900 are passed through and buckled into the limiting holes.
[0062] See also Figure 4 When assembling the shunt-based electric energy meter 10, the positive terminal 610 and the negative terminal 620 of the shunt 600 are snap-fitted into the clearance hole 230 to connect the sampling module to the second shell 200; at the same time, the display screen 320, the second circuit board 310, the main control board 400 and the isolation board 800 are sequentially installed into the first shell 100. In order to ensure the stable installation of the second circuit board 310 and the main control board 400, a fixing method combining the limit hole and the limit buckle 900 is adopted.
[0063] Multiple limiting holes are designed on both the second circuit board 310 and the main control board 400. A plurality of limiting buckles 900 are provided on the inner wall of the first housing 100, and these limiting buckles 900 are matched with the limiting holes on the second circuit board 310 and the main control board 400. During the assembly process, the limiting buckles 900 will pass through the limiting holes and be buckled and fixed, forming a locking mechanism to ensure the firm fixation of the second circuit board 310 and the main control board 400 inside the shunt-based electricity meter 10. Through the combination of the limiting holes and the limiting buckles 900, the internal components of the shunt-based electricity meter 10 can be easily disassembled when maintenance or replacement is required, without the need for complex tools or additional fixing devices. This not only simplifies the assembly process, improves production efficiency, but also reduces the risk of loosening or falling off of the second circuit board 310 and the main control board 400, enhancing the durability and stability of the shunt-based electricity meter 10.
[0064] In one embodiment, the size of the second circuit board 310 in the length direction of the shunt-based electricity meter 10 is smaller than that of the main control board 400. Some of the limiting buckles 900 pass through the limiting holes on the second circuit board 310, and some of the limiting buckles 900 are arranged on both sides of the second circuit board 310 in the length direction of the shunt-based electricity meter 10 and pass through the limiting holes on the main control board 400.
[0065] Please refer to Figure 1 and Figure 4 , the size of the second circuit board 310 in the length direction of the shunt-based electricity meter 10 is smaller than that of the main control board 400, which is convenient for the setting of the limiting buckles 900. The limiting buckles 900 connecting the main control board 400 do not need to pass through the second circuit board 310. Thus, the second circuit board 310 does not need to be additionally provided with redundant through holes for the limiting buckles 900 to pass through, which is not only more convenient for the circuit layout on the second circuit board 310, but also improves the production efficiency of the second circuit board 310.
[0066] The limiting buckles 900 are used in two parts. One part of the limiting buckles 900 directly passes through the limiting holes on the second circuit board 310 to ensure the firm fixation of the second circuit board 310, and the other part of the limiting buckles 900 is distributed on both sides of the second circuit board 310 in the length direction of the shunt-based electricity meter 10, that is, the area of the main control board 400 not covered by the second circuit board 310. These limiting buckles 900 pass through the limiting holes on the main control board 400 to achieve the fixation of the main control board 400.
[0067] In one embodiment, a plurality of limiting ribs 160 are provided on the inner wall of the first housing 100. The plurality of limiting ribs 160 are respectively arranged on both sides of the second circuit board 310 in the length direction of the shunt-based electricity meter 10. The limiting ribs 160 extend along the direction from the main control board 400 to the isolation board 800, and the width of the limiting ribs 160 gradually decreases in the direction from the main control board 400 to the isolation board 800. The limiting ribs 160 are provided with clamping grooves 161, and the isolation board 800 is provided with notch grooves 810 corresponding to the clamping grooves 161. The clamping grooves 161 and the notch grooves 810 are inserted and connected in a butt joint manner.
[0068] Please refer to Figures 3 to 6 , in order to further improve the stability of the internal components of the shunt-based electricity meter 10 and the accuracy of assembly, a plurality of limiting ribs 160 are designed on the inner wall of the first housing 100. These limiting ribs 160 not only play a role in limiting, but also realize the fixed connection to the isolation board 800.
[0069] The width of the limiting ribs 160 gradually decreases in the direction from the main control board 400 to the isolation board 800, forming a wedge-shaped structure. It can play a guiding role during the assembly process, facilitating the accurate alignment of the isolation board 800. At the same time, it can provide additional mechanical locking after fixation, enhancing the connection stability between the isolation board 800 and the limiting ribs 160. The limiting ribs 160 are provided with clamping grooves 161, and the corresponding positions on the isolation board 800 are designed with notch grooves 810. During assembly, the clamping grooves 161 and the notch grooves 810 are inserted and connected in a butt joint manner. Since the width of the limiting ribs 160 gradually decreases in the direction from the main control board 400 to the isolation board 800, the heights of the two groove side walls of the clamping grooves 161 in the direction from the main control board 400 to the isolation board 800 are different, so that the clamping grooves 161 can form a mechanical interlocking structure with the notch grooves 810, not only ensuring the stable fixation of the isolation board 800, but also simplifying the assembly process and improving the production efficiency.
[0070] In one embodiment, the second circuit board 310 is provided with limiting grooves corresponding to the limiting ribs 160. The limiting ribs 160 pass through the limiting grooves, playing a role in limiting the second circuit board 310, avoiding the shaking of the second circuit board 310 in the length direction of the shunt-based electricity meter 10, and improving the installation stability of the internal components of the shunt-based electricity meter 10.
[0071] In one embodiment, the first housing 100 has a first end face 110 close to the second housing 200. The edge of the first end face 110 is provided with a first step portion 120. The second housing 200 has a second end face 210 close to the first housing 100. The edge of the second end face 210 is provided with a second step portion 220. The first step portion 120 abuts against the second end face 210, and the second step portion 220 abuts against the first end face 110.
[0072] Please refer to Figure 5 andFigure 7 The first step portion 120 and the second end face 210 are correspondingly matched, and the second step portion 220 and the first end face 110 are correspondingly matched. When the first housing 100 and the second housing 200 are butted, accurate positioning can be provided, enabling the first housing 100 and the second housing 200 to be quickly aligned and avoiding assembly deviation. At the same time, it also facilitates the subsequent operation of fixedly connecting the first housing 100 and the second housing 200. The first step portion 120 and the second step portion 220 form a limiting structure with each other, preventing the first housing 100 and the second housing 200 from being misaligned with each other during the operation, thereby improving the processing efficiency of the shunt-based electricity meter 10.
[0073] In one embodiment, ultrasonic welding is used between the first housing 100 and the second housing 200.
[0074] The materials of the first housing 100 and the second housing 200 can be selected as plastics. The connection between the first housing 100 and the second housing 200 adopts ultrasonic welding technology, which is an efficient and environmentally friendly connection method. Ultrasonic welding technology generates local heat energy through high-frequency vibration, melts the materials of the contact surface in a short time, and then realizes the firm combination of the first housing 100 and the second housing 200. Before welding, ribs can be provided on the first step portion 120 or the second step portion 220 for melting during ultrasonic welding to fixedly connect the first housing 100 and the second housing 200, avoiding the melting of the contact surface between the first housing 100 and the second housing 200 from affecting the appearance and sealing performance of the shunt-based electricity meter 10.
[0075] The ultrasonic welding between the first housing 100 and the second housing 200 can be completed in an extremely short time, usually only a few seconds, greatly improving the production efficiency; compared with traditional fusion welding, ultrasonic welding does not require the addition of any soldering flux or filler materials, avoiding the emission of chemical substances and being environmentally friendly; the strength of the welded part is close to or reaches that of the base material itself, capable of withstanding large mechanical stresses, ensuring the structural stability and durability of the shunt-based electricity meter 10 in various environments; ultrasonic welding can form a good sealing effect, effectively preventing external factors such as water and dust from invading the inside of the shunt-based electricity meter 10, improving the protection level of the device. Using ultrasonic welding technology to connect the first housing 100 and the second housing 200 not only simplifies the assembly process, reduces production costs, but also ensures the overall sealing performance and structural strength of the shunt-based electricity meter 10.
[0076] The above are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. All equivalent structural transformations made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present utility model.
Claims
1. A shunt-based electric energy meter, characterized in that: include: a first shell; A second shell, fixedly connected to the first shell and enclosed with the first shell to form a receiving cavity; A metering module is arranged in the accommodating cavity, and the metering module includes a main control board and a display unit electrically connected to the main control board; A sampling module is arranged in the accommodating cavity, the sampling module comprises a signal acquisition unit and a shunt and a voltage terminal electrically connected to the signal acquisition unit, the signal acquisition unit is electrically connected to the main control board, and can transmit the collected current signal and voltage signal to the main control board; An isolation plate is arranged in the accommodating cavity and between the main control board and the signal acquisition unit.
2. The shunt-based electric energy meter according to claim 1, characterized in that: The signal acquisition unit includes a first circuit board, the diverter is arranged in the second shell and on a side of the first circuit board away from the isolation plate, the diverter includes a positive terminal and a negative terminal respectively arranged at opposite ends of the first circuit board, and two opposite clearance holes are formed between the first shell and the second shell, and the positive terminal and the negative terminal pass through the corresponding clearance holes.
3. The shunt-based electric energy meter according to claim 2, characterized in that: The voltage terminal is arranged on a side of the first circuit board away from the shunt, and the voltage terminal includes a fastener and a terminal post arranged on the first circuit board, the terminal post is provided with a first wire passing hole and a mounting hole that are connected to each other, and the fastener is arranged in the mounting hole; the first shell is provided with a second wire passing hole and an operation window that are connected to the accommodating cavity corresponding to the terminal post, the voltage terminal is exposed in the operation window, and the second wire passing hole is arranged corresponding to the first wire passing hole.
4. The shunt-based electric energy meter according to claim 3, characterized in that: The voltage terminal is arranged close to the negative terminal, an insulating baffle is protruding from the inner wall of the second shell, the insulating baffle is arranged between the terminal and the negative terminal and extends along the extension direction of the terminal, and the first circuit board is provided with a clearance groove for the insulating baffle to pass through.
5. The shunt-based electric energy meter according to claim 1, characterized in that: A display window is provided on a side of the first shell away from the second shell, the display unit includes a second circuit board and a display screen electrically connected to the second circuit board, the main control board is arranged between the isolation board and the second circuit board, the second circuit board is electrically connected to the main control board, and the display screen is arranged on a side of the second circuit board away from the main control board and is exposed in the display window.
6. The shunt-based electric energy meter according to claim 5, characterized in that: The second circuit board and the main control board are both provided with a plurality of limiting holes, and the shunt-based electric energy meter further comprises a plurality of limiting buckles provided on the inner wall of the first shell, and the limiting buckles penetrate and buckle into the limiting holes.
7. The shunt-based electric energy meter according to claim 6, characterized in that: The size of the second circuit board in the length direction of the shunt-based electric energy meter is smaller than that of the main control board. Some of the limit clips pass through the limit holes on the second circuit board, and some of the limit clips are arranged on both sides of the second circuit board in the length direction of the shunt-based electric energy meter and pass through the limit holes on the main control board.
8. The shunt-based electric energy meter according to claim 7, characterized in that: The inner wall of the first shell is provided with a plurality of limiting ribs, and the plurality of limiting ribs are arranged on both sides of the second circuit board in the length direction of the shunt-based electric energy meter, the limiting ribs extend from the main control board to the isolation board, and the width of the limiting ribs gradually decreases in the direction from the main control board to the isolation board, the limiting ribs are provided with a card slot, and the isolation plate is provided with a notch slot corresponding to the card slot, and the card slot is plug-in-connected with the notch slot.
9. The shunt-based electric energy meter according to claim 1, characterized in that: The first shell has a first end face close to the second shell, and a first step portion is provided at an edge of the first end face; the second shell has a second end face close to the first shell, and a second step portion is provided at an edge of the second end face; the first step portion abuts against the second end face, and the second step portion abuts against the first end face.
10. The shunt-based electric energy meter according to claim 9, characterized in that: The first shell and the second shell are welded by ultrasonic welding.