Mutual inductance relay module, electric energy meter and assembling method

Abstract

The invention relates to a mutual inductance relay module, an electric energy meter and an assembling method, the mutual inductance relay module comprises a mutual inductor and a relay, the relay is detachably connected with the mutual inductor, the mutual inductor and the relay are pre-assembled into an integral structure, and the mutual inductance relay module is detachably installed in an electric energy meter shell, so that in the installation process, the mutual inductance relay module can be installed in the electric energy meter in a detachable mode. According to the utility model, the mutual inductor and the relay can be firstly assembled outside the shell, then the mutual inductance relay module is installed on the shell, and the structure is innovated, so that the assembly process of parts is simplified to a great extent, the installation difficulty is reduced, the product quality is ensured, the working procedures are reduced, the assembly time is shortened, the assembly cost is further reduced, and the production efficiency is improved. The assembling efficiency of the electric energy meter is improved, cost is reduced, efficiency is improved, and quality is stable and reliable.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and in particular to a mutual inductance relay module, an energy meter, and an assembly method. Background Technology

[0002] As DIN rail-mounted energy meters become increasingly smaller and their functional integration improves, higher demands are placed on the arrangement and assembly of internal components. In practical applications, current transformers and relays are key functional modules in energy meters, and their installation methods directly affect overall assembly efficiency and product consistency.

[0003] In related technologies, energy meters that include current transformers and relays have problems such as high assembly difficulty and high assembly cost during the assembly process, making it difficult to meet the current demand for efficient production and reliable assembly. Summary of the Invention

[0004] This application provides a mutual inductance relay module, an energy meter, and an assembly method, which reduces the assembly difficulty of the energy meter and at least partially solves the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a mutual inductance relay module is provided, comprising: Mutual transformers; and A relay, wherein the relay is detachably connected to the current transformer. In some embodiments, the relay includes an electrical connection terminal, the current transformer is provided with a positioning hole, and the electrical connection terminal is detachably inserted into the positioning hole to realize a detachable connection between the current transformer and the relay. In some embodiments, the electrical connection terminal and the positioning hole are clearance-fitted; And / or, the current transformer is provided with at least two of the positioning holes.

[0006] In some embodiments, the number of positioning holes is 2, 3, or 4; And / or, the number of relays is the same as the number of positioning holes.

[0007] In some embodiments, the electrical connection terminal is integrated with the relay, with one end of the electrical connection terminal located at one end of the relay and the other end of the electrical connection terminal located at the other end of the relay. In some embodiments, the electrical connection terminal is provided with a positioning groove for engaging with the housing to define the position of the electrical connection terminal relative to the housing. In some embodiments, the positioning groove is disposed at the end of the electrical connection terminal. In some embodiments, the current transformer is provided with an anti-static part, which is located between adjacent relays to isolate the electrical connection terminals of adjacent relays.

[0008] In some embodiments, the antistatic part includes a protrusion extending from the surface of the current transformer. In some embodiments, the relay includes a sampling terminal and a reinforcement for reinforcing the sampling terminal. In some embodiments, the sampling terminal is made of an alloy with elastic properties. In some embodiments, the reinforcement is used to fix the sampling terminal close to its free end side. In some embodiments, the sampling terminal includes a body segment and a pin segment, the width of the pin segment being smaller than the width of the body segment, and the reinforcement is used to connect to the end of the body segment near the pin segment.

[0009] In some embodiments, the current transformer includes a first positioning part for guiding the circuit board to align with the current transformer relay module so that the circuit board is inserted into a predetermined position; And / or, the current transformer includes a snap-fit ​​portion for guiding the circuit board to align with the current transformer relay module, so that the circuit board is inserted into a predetermined position and then snapped and fixed with the snap-fit ​​portion. In some embodiments, the first positioning part includes a positioning post protruding from the surface of the current transformer.

[0010] In some embodiments, the snap-fit ​​portion includes a buckle protruding from the surface of the current transformer.

[0011] According to a second aspect of this application, an electricity meter is provided, including the mutual inductance relay module described in the above technical solution.

[0012] In some embodiments, the electricity meter further includes a housing, wherein: The housing includes a second positioning part, which is used to contact the side wall of the mutual inductance relay module to define the position of the mutual inductance relay module relative to the housing; And / or, the housing includes a limiting part for guiding the mutual inductance relay module to be installed in the housing. In some embodiments, the limiting part includes at least two limiting structures, which are used to cooperate with the mutual inductance relay module to provide limiting guidance for the transformer and the relay during the installation of the mutual inductance relay module. In some embodiments, at least two of the limiting structures are sequentially arranged along the installation direction of the mutual inductance relay module. During the installation of the mutual inductance relay module into the housing, the at least two limiting structures are used to sequentially guide the mutual inductance relay so that the mutual inductance relay module is installed in the housing. In some embodiments, the gap between at least two of the limiting structures and the mutual inductance relay module gradually decreases along the installation direction. In some embodiments, there are two limiting structures, namely a first limiting structure and a second limiting structure.

[0013] In some embodiments, the second positioning part includes a first positioning structure disposed on the housing, the first positioning structure being used to cooperate with the electrical connection terminal of the relay to define the position of the electrical connection terminal relative to the housing; And / or, the second positioning part includes a second positioning structure disposed on the housing, the second positioning structure being used to cooperate with the current transformer to define the position of the current transformer relative to the housing; And / or, the second positioning part includes a third positioning structure disposed on the housing, the third positioning structure being used to cooperate with the relay to define the position of the relay relative to the housing. In some embodiments, the electricity meter further includes a circuit board, and the housing further includes a third positioning part for cooperating with the circuit board to define the position of the circuit board relative to the housing. In some embodiments, during the installation of the circuit board, the circuit board sequentially engages with the third positioning part and the first positioning part of the relay to position the circuit board on the housing and align it with the mutual inductance relay module. In some embodiments, the electricity meter further includes a wiring component, and the housing has an opening into which the wiring component is mounted. According to a third aspect of this application, a method for assembling an electricity meter is also provided for installing the electricity meter described in the above technical solution, comprising the following steps: The current transformer and the relay are assembled to form a current transformer relay module; Install the mutual inductance relay module into the housing; The circuit board is mounted to the housing.

[0014] In some embodiments, mounting the mutual inductance relay module to the housing includes: The mutual inductor is made to cooperate with the second positioning structure; This allows the relay to engage with the third positioning structure; The electrical connection terminals of the relay are engaged with the first positioning structure to guide the mutual inductance relay module to be installed into the housing.

[0015] In some embodiments, mounting the circuit board to the housing includes: The circuit board is engaged with the third positioning part to guide the circuit board to be initially aligned with the mutual inductance relay module; The circuit board is made to mate with the first positioning part to guide the circuit board to further align with the mutual inductance relay module.

[0016] The current transformer relay module of this application pre-assembles the current transformer and the relay into an integral structure to form the current transformer relay module, and installs the current transformer relay module in a detachable manner in the energy meter housing. This allows the current transformer and the relay to be assembled outside the housing first, and then the current transformer relay module to be installed into the housing. This simplifies the component assembly process to a certain extent, reduces the installation difficulty, and helps to reduce the assembly cost, thereby improving the assembly efficiency of the energy meter.

[0017] By pre-connecting the current transformer and relay outside the housing, the assembly steps inside the housing can be reduced, thereby improving the assembly efficiency and consistency of the energy meter. At the same time, when the current transformer and relay module is installed as a whole into the housing, its relatively large size makes it easier to manually position and operate, contributing to improved convenience and stability during the assembly process.

[0018] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0020] Figure 1 This is a schematic diagram of the structure of the mutual inductor provided in an exemplary embodiment of this disclosure; Figure 2 This is a schematic diagram of the structure of a relay provided in an exemplary embodiment of this disclosure; Figure 3 This is a schematic diagram of the structure of the mutual inductance relay module provided in an exemplary embodiment of this disclosure; Figure 4 This is an exploded view of a portion of the structure of an electricity meter provided in an exemplary embodiment of this disclosure; Figure 5 This is a partial structural schematic of the electricity meter provided in the exemplary embodiments of this disclosure; Figure 6 This is an exploded view of the housing and circuit board of the energy meter provided in an exemplary embodiment of this disclosure; Figure 7 This is a schematic diagram of the connection structure between the circuit board and the housing of the energy meter provided in the exemplary embodiments of this disclosure; Figure 8 This is an exploded structural diagram of the housing and wiring components of the energy meter provided in an exemplary embodiment of this disclosure. Figure 9 This is a schematic diagram of the connection structure between the housing and wiring components of an electricity meter provided in an exemplary embodiment of this disclosure.

[0021] Explanation of reference numerals in the attached figures: 10. Housing; 11. Second positioning part; 11a. First positioning structure; 11b. Second positioning structure; 11c. Third positioning structure; 12. Third positioning part; 13. Opening; 14. Limiting part; 14a. Limiting structure; 14a1. First limiting structure; 14a2. Second limiting structure; 20. Circuit board; 30. Wiring component; 100. Current transformer; 110. Positioning hole; 120. Anti-static part; 130. First positioning part; 131. Positioning post; 140. Snap-fit ​​part; 141. Snap-fit; 200. Relay; 210. Electrical connection terminal; 211. Positioning groove; 220. Sampling terminal; 221. Main body section; 222. Pin section; 230. Reinforcing part. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0023] According to the first aspect of this application, referring to Figures 1 to 3 This disclosure provides a mutual inductance relay module for use in an electricity meter. Exemplarily, it is applied to a track-mounted electricity meter. The electricity meter includes a housing 10 and a circuit board 20. The mutual inductance relay module is detachably installed within the housing 10 and electrically connected to the circuit board 20.

[0024] Specifically, the mutual inductance relay module is first installed inside the housing 10 in a detachable manner, and then the circuit board 20 is installed into the housing 10 so that the circuit board 20 and the mutual inductance relay module are aligned in position, so that the two can be electrically connected by welding or other electrical connection methods.

[0025] It should be understood that a snap-fit ​​structure can be formed between the circuit board 20 and the mutual inductance relay module. This snap-fit ​​structure can stabilize the positional relationship between the circuit board 20 and the mutual inductance relay module to a certain extent and reduce the risk of positional displacement during installation. At the same time, a snap-fit ​​structure is also formed between the circuit board 20 and the housing 10, which is conducive to the fixation of the overall structure and promotes the mutual inductance relay module, the circuit board 20 and the housing 10 to form a stable whole.

[0026] This structural design simplifies the assembly process, improves installation accuracy, and reduces electrical connection difficulties caused by unstable positioning, thereby helping to improve the assembly efficiency and reliability of the electricity meter.

[0027] It should be noted that the "clamping structure" in this embodiment refers to the mechanical fit achieved by interlocking, plugging or snapping the structure together. It is intended to limit the relative movement between components to a certain extent, rather than completely restrict it, and to allow moderate elastic deformation to accommodate assembly errors and ease of operation.

[0028] In some embodiments, refer to Figure 1 , Figure 3 The current transformer relay module includes a current transformer 100 and a relay 200, which are detachably connected. This detachable connection structure facilitates the pre-assembly of the current transformer 100 and the relay 200, making it easier to install the assembled current transformer relay module as a whole into the housing 10, thereby simplifying the assembly process and improving installation efficiency.

[0029] It is understandable that after the current transformer 100 and the relay 200 are detachably connected, their relative positions can be either relatively fixed or relatively movable, both of which are beneficial for module installation. A relatively fixed connection structure facilitates the construction of a stable whole, enabling rapid installation of the housing 10. Conversely, if the connection structure allows for a certain degree of relative movement, it helps to fine-tune the positions of the current transformer 100 and the relay 200 during the overall installation process to adapt to the installation requirements of different housing 10 models, while also taking into account manufacturing tolerances. This improves the installation flexibility and adaptability of the current transformer relay module, promoting a fast and reliable installation process.

[0030] By detachably connecting the current transformer 100 and the relay 200, the required model of relay 200 can be assembled with the required model of current transformer 100 according to actual needs, thereby enabling the rapid assembly of various models of energy meters. This detachable connection structure is beneficial to achieving flexible combination of current transformer 100 and relay 200, meeting the diverse assembly needs of different models of energy meters, and improving assembly efficiency.

[0031] Meanwhile, the current transformer 100 and the relay 200 are detachable, allowing for individual replacement of either the current transformer 100 or the relay 200 during maintenance. This structural design facilitates disassembly and replacement to a certain extent, reducing maintenance complexity, lowering maintenance costs, and improving the convenience and economy of electricity meter maintenance.

[0032] "Detachable connection" refers to the connection between the current transformer 100 and the relay 200 via means such as snap-fit ​​141, slots, threads, and elastic elements, which allows the two to maintain a relatively stable structural relationship while enabling disassembly by external force when needed. This structural design ensures the stability of the module while providing it with a certain degree of flexibility and maintainability, adapting to manufacturing errors and the diversity of installation environments.

[0033] Therefore, this structure not only helps to simplify the process and improve efficiency during the assembly stage, but also helps to reduce replacement time and costs during the maintenance stage, thereby improving the overall ease of use and economic benefits of the electricity meter.

[0034] In some embodiments, refer to Figure 2 , Figure 3 The relay 200 includes an electrical connection terminal 210, and the current transformer 100 is provided with a positioning hole 110. The electrical connection terminal 210 is detachably inserted into the positioning hole 110 to achieve a detachable connection between the current transformer 100 and the relay 200. Through the detachable connection between the electrical connection terminal 210 and the positioning hole 110, a stable assembly of the relay 200 and the current transformer 100 can be achieved structurally, thereby forming a modular current transformer relay module, which is convenient for subsequent overall installation into the housing 10.

[0035] The electrical connection terminal 210 not only serves as a mechanical connection but also enables the electrical connection between the relay 200 and the current transformer 100. Specifically, the current transformer 100 can detect current signals and transmit these signals to the relay 200 via the electrical connection terminal 210. The relay 200 then performs tripping, closing, or other response control actions according to set operating conditions. Therefore, the insertion relationship between the electrical connection terminal 210 and the positioning hole 110 not only achieves structural connection but also establishes a signal path, thereby enabling functional coordination between the relay 200 and the current transformer 100.

[0036] "Functional coordination" here refers to the reliable transmission of electrical or control signals between the relay 200 and the transformer 100 through the electrical connection terminal 210, enabling the relay 200 to make a control response based on the detection result of the transformer 100, thereby meeting the functional requirements of the energy meter in overload protection, trip control, etc.

[0037] Furthermore, due to the plug-in detachable structure, during the assembly of the relay 200 and the current transformer 100, the relative positions between the relay 200 and the current transformer 100 can be adjusted to a certain extent according to the spatial structure of the housing 10 or the installation position, to adapt to energy meter products with different structural layouts. Moreover, since the electrical connection terminal 210 is always located inside the current transformer 100 during use, even if the relative positions between the relay 200 and the current transformer 100 are adjusted during installation, the plugging state of the electrical connection terminal 210 will not be affected, thus affecting the electrical signal path between the two and helping to ensure stable functional coordination.

[0038] In summary, through the above structural design, the relay 200 and the current transformer 100 can not only achieve fast and reliable structural assembly, but also establish a stable functional connection relationship, which can improve the flexibility and reliability of modular assembly, and to a certain extent benefit the production efficiency, adaptability and maintenance convenience of the electricity meter.

[0039] In some embodiments, refer to Figure 2 , Figure 3 The electrical connection terminal 210 and the positioning hole 110 are clearance fit. Specifically, the electrical connection terminal 210 on the relay 200 is inserted into the positioning hole 110 on the current transformer 100, with a certain assembly gap between them, so that the electrical connection terminal 210 can slide or be adjusted appropriately after being inserted into the positioning hole 110, without becoming significantly loose.

[0040] By adopting a clearance fit structure, on the one hand, quick insertion between the electrical connection terminal 210 and the positioning hole 110 can be achieved, which is beneficial to improving the assembly efficiency of the current transformer 100 and the relay 200; on the other hand, during the assembly process, the operator can make fine adjustments to the position of the inserted electrical connection terminal 210 within a certain range, which facilitates the optimization and matching of the relative position between the relay 200 and the current transformer 100 to meet the structural requirements of different housing models 10 or different layouts.

[0041] Furthermore, while maintaining basic connection stability, the clearance fit can also buffer manufacturing tolerances and assembly errors to a certain extent, which is beneficial to improving the consistency and versatility of the mutual inductance relay module in the mass assembly process. Since the electrical connection terminal 210 is usually a metal conductive structure, its gap with the positioning hole 110 will not significantly affect the transmission stability of the electrical signal within a reasonable range, thus maintaining reliability in terms of physical connection and electrical functional fit.

[0042] It should be noted that the "clearance fit" mentioned here is different from the interference fit, nor is it a loose connection. The fit clearance is limited to a certain range by the structural design, which allows for moderate adjustment while maintaining the insertion stability of the electrical connection terminal 210, thereby achieving a balance between functional realization and assembly convenience.

[0043] In some embodiments, refer to Figure 1 , Figure 3 The current transformer 100 is provided with at least two positioning holes 110. Specifically, the positioning holes 110 are used to insert the electrical connection terminals 210 on the relay 200, thereby realizing a detachable electrical connection between the relay 200 and the current transformer 100. By providing multiple positioning holes 110, multiple relays 200 can be installed on one current transformer 100.

[0044] It is understandable that the number of relays 200 installed on the current transformer 100 is related to the number of phases of the matched energy meter. For example, in the application of a single-phase energy meter, usually only two relays 200 and one current transformer 100 are needed to meet the needs of current measurement and control, while in a three-phase energy meter, it may be necessary to configure three relays 200 to work in conjunction with three current transformers 100 respectively.

[0045] Furthermore, the arrangement of multiple positioning holes 110 can form a certain layout, enabling the relay 200 to be matched and connected to the current transformer 100 in a certain direction or at a specific position. For example, these positioning holes 110 can be arranged at intervals along the length or width of the current transformer 100, thereby making the arrangement of the relay 200 more regular and beneficial to forming a compact and rationally laid-out current transformer relay module assembly structure.

[0046] It should be noted that the "at least two positioning holes 110" is not limited to exactly two, nor does it exclude the possibility that multiple positioning holes 110 may have different sizes or spacings. Its structural design can be optimized based on the distribution of the electrical connection terminals 210 of the relay 200 and the spatial arrangement of the internal structure of the current transformer 100. This not only accommodates the insertion requirements of different models of relays 200 but also improves the versatility of the entire module across multiple models of energy meters.

[0047] In some embodiments, the number of positioning holes 110 is 2, 3, or 4. The specific number can be selected according to the type of electricity meter and its functional requirements in the target application. For example, in the application of three-phase electricity meters, it is common practice to configure one relay 200 for each current channel, which may require three positioning holes 110 to correspond to the plug-in installation of three sets of relay 200 terminals.

[0048] In some embodiments, refer to Figure 1 , Figure 3The number of relays 200 is the same as the number of positioning holes 110. This structural design can adapt to the wiring requirements of energy meters with different number of phases, and it is also beneficial to form a more integrated mutual inductance relay module, so that it can be quickly positioned and fixed as a whole when installed in the housing 10, thereby improving assembly efficiency and reducing the accumulation of assembly errors to a certain extent.

[0049] It should be noted that although the number of positioning holes 110 or relays 200 mentioned in the above embodiments is 2, 3 or 4, those skilled in the art can make appropriate adjustments according to actual usage needs without departing from the concept of the present invention. For example, by setting more positioning holes 110 to improve the expansion capability, or by arranging different types of connection interfaces to be compatible with different models of relays 200, the application scope of the mutual inductance relay module can be further expanded.

[0050] In some embodiments, refer to Figure 2 , Figure 3 The electrical connection terminal 210 is integrated with the relay 200, with one end of the electrical connection terminal 210 located at one end of the relay 200 and the other end of the electrical connection terminal 210 located at the other end of the relay 200. By integrating the electrical connection terminal 210 with the relay 200 body, it is beneficial to reduce the number of components, improve the compactness of the module structure, and facilitate standardized production and assembly.

[0051] Specifically, when the electrical connection terminal 210 is disposed through the body of the relay 200, structural stability can be achieved through methods such as insert molding or insertion fixing, thereby maintaining electrical conduction while also possessing a certain degree of mechanical strength. At the same time, this structural design makes it easy for the electrical connection terminal 210 to be connected to external circuits.

[0052] On the other hand, the electrical connection terminal 210 is integrated with the relay 200 and extends from both ends, which facilitates the formation of a reliable mechanical connection structure and electrical connection relationship between the relay 200 and the current transformer 100, while ensuring the independence and operability of the connection space on the other side. In practical applications, this structure is beneficial to improving the flexibility of the overall wiring, especially in scenarios where the internal space of the housing 10 is limited or the wiring path is complex, and can reduce the installation difficulty caused by wiring overlap or interference to a certain extent.

[0053] It should be noted that the specific form of the "electrical connection terminal 210" can be a pin type, a metal strip type, etc., and the specific type can be selected according to the application scenario, electrical performance requirements and the layout of the housing 10.

[0054] In some embodiments, refer to Figure 2 , Figure 3The electrical connection terminal 210 is provided with a positioning groove 211, which is used to cooperate with the housing 10 to define the position of the electrical connection terminal 210 relative to the housing 10. For example, the shape of the positioning groove 211 may be a recessed structure, an annular groove, or a slot structure formed between limiting bosses. The positioning groove 211 is used to cooperate with the limiting structure 14a on the housing 10 (such as a limiting protrusion, slot sidewall, or clamping part), thereby constraining the position of the electrical connection terminal 210 during assembly and defining the position of the electrical connection terminal 210 relative to the housing 10.

[0055] The positioning groove 211, in conjunction with the housing 10, effectively limits and fixes the electrical connection terminal 210, ensuring that the relay 200, integrated with the electrical connection terminal 210, maintains a stable spatial position relative to the housing 10 after installation. This structural design prevents the relay 200 from shifting position due to the operation or adjustment of the current transformer 100 after assembly, thus improving assembly accuracy and structural reliability.

[0056] On the other hand, since the electrical connection terminal 210 and the current transformer 100 form a movable engagement relationship, a certain amount of mobility is maintained between the electrical connection terminal 210 and the current transformer 100. Therefore, under the premise that the installation position of the relay 200 relative to the housing 10 is fixed, the relative position between the current transformer 100 and the electrical connection terminal 210 can be adjusted to facilitate the rapid assembly and positioning of the current transformer 100.

[0057] In some embodiments, the positioning groove 211 is disposed at the end of the electrical connection terminal 210. Specifically, the positioning groove 211 may be disposed at one end or both ends of the electrical connection terminal 210. When the positioning groove 211 is disposed at both ends of the electrical connection terminal 210, two limiting parts 14 that cooperate with it may be disposed inside the housing 10, so that the electrical connection terminal 210 can form a relatively stable limiting fit in the axial direction during installation.

[0058] The positioning groove 211 is located at the end of the electrical connection terminal 210, which facilitates visual observation of the mating relationship between the electrical connection terminal 210 and the housing 10 during the insertion process. This makes it easier to determine whether the insertion status is in place, improving the visibility and accuracy of the assembly operation. The positioning groove 211 at the end guides the insertion path of the electrical connection terminal 210 within the housing 10, improving assembly consistency and facilitating rapid positioning and efficient assembly.

[0059] In some embodiments, refer to Figure 1 , Figure 3The current transformer 100 is equipped with an anti-static component 120, which is located between adjacent relays 200 to isolate the electrical connection terminals 210 of the adjacent relays 200. It is understood that because the current transformer 100 and the relays 200 are detachably connected, the distance between the electrical connection terminals 210 of adjacent relays 200 may be relatively close after assembly, posing a certain risk of static electricity accumulation or electrical interference. By providing the anti-static component 120, the potential static electricity effects between adjacent electrical connection terminals 210 are reduced, thereby improving the overall safety and stability of the electricity meter.

[0060] For example, the anti-static part 120 can be configured as a structure protruding from the surface of the current transformer 100. This structure forms a physical isolation in space, increases the spacing between adjacent electrical connection terminals 210, and reduces the electrical coupling between the electrical connection terminals 210. The specific form of the anti-static part 120 can be designed in various ways according to actual application requirements. For example, it can be a rib-shaped, boss-shaped, or partition-shaped structure. This structure is formed with the current transformer 100 body by integral molding or post-installation, thereby achieving an organic combination of structure and function.

[0061] In some embodiments, the antistatic portion 120 includes a protruding ridge protruding from the surface of the current transformer 100. The ridge forms a physical isolation in space, increases the spacing between adjacent electrical connection terminals 210, and reduces the electrical coupling between the electrical connection terminals 210.

[0062] In some embodiments, refer to Figure 2 , Figure 3 The relay 200 includes a sampling terminal 220 and a reinforcing member 230 for securing the sampling terminal 220. It is understood that the sampling terminal 220 typically has a certain length, and therefore, during assembly and maintenance, there may be a certain degree of deformation risk, leading to misalignment of the sampling terminal 220. This misalignment may affect the alignment of the sampling terminal 220 with the circuit interface on the circuit board 20, thereby affecting the reliability of the electrical connection.

[0063] By setting the reinforcement member 230, the deformation of the sampling terminal 220 can be limited to a certain extent, which helps to maintain the spatial stability of the sampling terminal 220 and reduce the risk of mis-touch or displacement during assembly. The reinforcement member 230 can take the form of a clamp, a snap-fit ​​141, or a support, and can be used in conjunction with the sampling terminal 220 to effectively control its deformation without affecting the function of the sampling terminal 220. This structural design helps to improve the stability of the connection between the relay 200 and the circuit board 20 and the reliability of the overall assembly.

[0064] In some embodiments, the sampling terminal 220 is made of an alloy with elastic properties. This elasticity allows the sampling terminal 220 to exhibit a certain degree of elastic deformation when subjected to external forces, reducing the possibility of plastic deformation and thus maintaining its shape and dimensional stability during use. This characteristic facilitates a more precise fit between the sampling terminal 220 and the electrical connection interface of the circuit board 20, improving the reliability and durability of the contact.

[0065] For example, the sampling terminal 220 can be made of phosphor bronze. Phosphor bronze is suitable for manufacturing electrical connection components that require both elasticity and conductivity due to its good elasticity, conductivity, and machinability. By using phosphor bronze, the elastic recovery capability of the sampling terminal 220 is improved, and deformation caused by external forces during assembly or use is reduced, thereby helping to maintain the stability of the electrical connection and the reliability of the overall performance of the relay 200.

[0066] In some embodiments, refer to Figure 2 , Figure 3 The reinforcement member 230 is used to fix the sampling terminal 220 near its free end. By fixing the free end of the sampling terminal 220 with the reinforcement member 230, bending or deformation of the sampling terminal 220 can be limited to a certain extent, reducing the risk of deformation caused by external force or accidental operation. This structural design helps maintain the shape stability of the sampling terminal 220, thereby promoting precise docking between the sampling terminal 220 and the circuit board 20 interface, and further improving the electrical connection reliability of the relay 200 and the overall assembly stability.

[0067] In some embodiments, the sampling terminal 220 includes a body segment 221 and a pin segment 222. The width of the pin segment 222 is smaller than the width of the body segment 221. A reinforcement member 230 is used to connect to the end of the body segment 221 near the pin segment 222. The pin segment 222 is mainly used for connection to the circuit board 20, and the body segment 221 is located between the pin segment 222 and the relay 200. This structural design is beneficial in maintaining the small size of the pin segment 222 for insertion into the circuit board 20, while effectively supporting the sampling terminal 220 through the cooperation of the wider body segment 221 and the reinforcement member 230. This reduces the possibility of deformation of the sampling terminal 220 during assembly or use, thereby helping to maintain the alignment of the sampling terminal 220 with the circuit board 20 interface and the stability of the electrical connection.

[0068] In some embodiments, refer to Figure 2 , Figure 3The current transformer 100 includes a first positioning part 130, which guides the alignment of the circuit board 20 with the current transformer relay module, allowing the circuit board 20 to be inserted into a predetermined position. Specifically, during the installation of the circuit board 20, the circuit board 20 first contacts the first positioning part 130, and the initial alignment between the circuit board 20 and the current transformer relay module is achieved by utilizing the structural shape or positioning features of the first positioning part 130. Subsequently, the circuit board 20 moves closer to the current transformer relay module along the guiding direction, aligning the pins and other connecting components on the current transformer 100 and the relay 200 with the electrical connection holes on the circuit board 20. This alignment process facilitates accurate insertion connection between the circuit board 20 and the current transformer relay module, reduces insertion errors, and improves assembly reliability and efficiency. After insertion, a stable electrical connection is formed between the current transformer 100 and the relay 200 through a soldering process, further ensuring the functional realization and electrical performance of the module.

[0069] It should be noted that the first positioning part 130 can be implemented in various structural forms such as bosses, slots, and guide posts, and the specific structure can be designed and adjusted according to actual needs. The setting of the first positioning part 130 helps to reduce errors and assembly difficulty during the installation process, and promotes the improvement of the overall assembly quality of the mutual inductance relay module.

[0070] In some embodiments, refer to Figure 1 , Figure 3 The current transformer 100 includes a snap-fit ​​portion 140, which guides the circuit board 20 to align with the current transformer relay module, so that the circuit board 20 is inserted into a predetermined position and snapped into place by the snap-fit ​​portion 140. Specifically, the snap-fit ​​portion 140 engages with the circuit board 20 through a specific structural form (e.g., elastic snap 141, slot, hook, etc.), guiding the circuit board 20 to accurately approach the current transformer relay module along a predetermined path, ensuring that the electrical connection terminals 210 on the relay 200 and the current transformer 100 can be aligned with the electrical connection holes on the circuit board 20.

[0071] Once the circuit board 20 is in place, the snap-fit ​​part 140 provides a certain positioning and fixing effect through mechanical engagement, which can prevent relative displacement between the circuit board 20, the relay 200, and the current transformer 100 to a certain extent. This structural design helps reduce the risk of reduced welding quality or poor electrical connection due to positional misalignment during subsequent soldering, thereby improving the reliability of the overall assembly and the stability of the electrical connection.

[0072] In some embodiments, the first positioning part 130 includes a positioning post 131 protruding from the surface of the current transformer 100. This positioning post 131 serves as a guide structure, allowing it to be inserted into corresponding holes on the circuit board 20 during installation, thereby achieving initial alignment between the circuit board 20 and the current transformer relay module. The guiding effect of the positioning post 131 facilitates precise insertion of the circuit board 20 into the current transformer relay module along a predetermined direction, reducing installation errors and improving assembly efficiency.

[0073] In some embodiments, the latching portion 140 includes a latch 141 protruding from the surface of the current transformer 100. This latch 141 not only forms a latching connection with a mating portion on the circuit board 20, achieving relative fixation between the circuit board 20 and the current transformer 100, but also functions as a guiding structure. This guiding structure helps guide the circuit board 20 into its correct position during installation, reducing installation deviations and thus improving the accuracy and efficiency of the overall assembly. After the circuit board 20 is installed in place, the latching portion 140 forms a stable latching engagement with the circuit board 20, which helps maintain the relative positional stability between the circuit board 20 and the current transformer relay module, thereby reducing the risk of poor electrical connection due to relative displacement in subsequent processes such as soldering.

[0074] According to the second aspect of this disclosure, referring to Figures 3 to 9 The present invention provides an electricity meter that includes the aforementioned mutual inductance relay module. This electricity meter possesses all the beneficial effects of the aforementioned mutual inductance relay module, which will not be elaborated further herein.

[0075] In some embodiments, refer to Figure 3 , Figure 4 The electricity meter also includes a housing 10, which includes a second positioning part 11. The second positioning part 11 is used to contact the side wall of the current transformer relay module to define the position of the current transformer relay module relative to the housing 10. The second positioning part 11 helps to effectively limit the movement of the current transformer 100 and the relay 200 during assembly. After the current transformer relay module is installed in place, the second positioning part 11 can achieve relative fixation between itself and the housing 10, thereby improving the structural stability between the components to a certain extent.

[0076] This structural design helps prevent the current transformer 100 or relay 200 from shifting or loosening within the housing 10 due to external forces such as vibration and impact during subsequent transportation, installation, or use. This maintains a stable connection between the current transformer 100, relay 200, and housing 10, reduces the risk of functional failure, and improves the overall assembly quality and reliability of the electricity meter.

[0077] In some embodiments, refer to Figure 4 , Figure 5The housing 10 includes a limiting part 14, which is used to guide the installation of the current transformer relay module into the housing 10. The limiting part 14 helps to limit the movement path of the current transformer relay module (including the current transformer 100 and the relay 200) during installation, thereby facilitating the operator to accurately guide the current transformer relay module into the installation position and improving the convenience and efficiency of assembly.

[0078] For example, the limiting part 14 can cooperate with the second positioning part 11 to guide the current transformer 100 and the relay 200 to gradually approach each other and eventually achieve a stable position relative to the housing 10 during the process of guiding the current transformer relay module to move in a specific direction to the second positioning part 11. This guiding process helps to prevent misalignment, tilting and other problems caused by manual assembly errors, thereby improving the accuracy and stability of the installation.

[0079] In some embodiments, refer to Figure 4 , Figure 5 The limiting part 14 includes at least two limiting structures 14a, which cooperate with the current transformer relay module to provide limiting guidance for the current transformer 100 and the relay 200 during the installation of the current transformer relay module. The arrangement of at least two limiting structures 14a helps to constrain the current transformer relay module from multiple directions, thereby improving the accuracy and stability of module installation to a certain extent.

[0080] Specifically, at least two limiting structures 14a can be distributed in different directions, such as on both sides or above and below the current transformer relay module, to facilitate position guidance in the horizontal and / or vertical directions. This allows the current transformer 100 and the relay 200 to gradually align with the installation area within the housing 10 during insertion, reducing the risk of jamming due to misalignment. Furthermore, when multiple limiting structures 14a are arranged sequentially along the insertion direction of the current transformer relay module, the spacing between the limiting structures 14a helps to form a gradually tightening guide path, i.e., a gradient guidance structure. This provides a smoother assembly transition between initial insertion and final positioning, improving overall assembly efficiency and stability.

[0081] In some embodiments, refer to Figure 4 , Figure 5At least two limiting structures 14a are sequentially arranged along the installation direction of the current transformer relay module. During the installation of the current transformer relay module into the housing 10, the at least two limiting structures 14a are used to guide the current transformer relay sequentially, so that the current transformer relay module is installed in the housing 10. This arrangement allows the current transformer relay module to be guided sequentially during the installation process, gradually advancing and positioning it towards the predetermined installation position. This design of limiting structures 14a distributed sequentially along the installation path can, to a certain extent, provide phased guidance for the installation process of the current transformer 100 and the relay 200, avoiding problems such as module misalignment or jamming due to posture deviation or improper insertion angle.

[0082] Furthermore, the multiple limiting structures 14a can be arranged with progressively increasing gaps, allowing the mutual inductance relay module to first contact the first limiting structure 14a1 for initial alignment during insertion, and then gradually transition to subsequent limiting structures 14a for precise positioning. This guiding process helps improve assembly smoothness, reduces operational difficulty, and also facilitates rapid and accurate installation in confined spaces, exhibiting good assembly adaptability and reliability.

[0083] It can be understood that the installation direction of the mutual inductance relay module refers to the direction in which it is installed into the housing 10. For example, as... Figure 4 or Figure 5 As shown, the mutual inductance relay module can be installed in the housing 10 in a top-to-bottom direction. That is, in this embodiment, the installation direction of the mutual inductance relay module is from top to bottom. Specifically, one side of the housing 10 is provided with a hollow structure for installing the mutual inductance relay module, so that the mutual inductance relay module can enter the housing 10 through the hollow structure on this side.

[0084] For example, the installation direction can be either shown in Figure 4 and... Figure 5 The straight line direction in the shell 10 can also present a certain degree of curved path or other adapted form according to the design requirements of the shell 10 structure.

[0085] In some embodiments, the gap between at least two limiting structures 14a and the mutual inductance relay module gradually decreases along the installation direction. By setting a gap fit structure with a converging trend, a gradually tightening guiding effect can be formed during the installation of the mutual inductance relay module, which is beneficial to guide the mutual inductance relay module to gradually fit the predetermined position of the housing 10 and achieve stable positioning at the installation end point.

[0086] Specifically, the varying gaps between the limiting structures 14a can provide different degrees of constraint on the mutual inductance relay module at different stages. Limiting structures 14a with larger initial gaps facilitate quick docking and insertion, while limiting structures 14a with smaller terminal gaps further restrict the relative positional offset of the mutual inductance relay module, improving installation accuracy. This structural configuration helps prevent problems such as jamming and scratching caused by posture deviations of the mutual inductance relay module during installation, improving the smoothness and reliability of the overall assembly.

[0087] In some embodiments, refer to Figure 4 , Figure 5 There are two limiting structures 14a, namely a first limiting structure 14a1 and a second limiting structure 14a2. The first limiting structure 14a1 and the second limiting structure 14a2 are arranged sequentially along the installation direction of the mutual inductance relay module, and are used to guide and cooperate with the mutual inductance relay module during the installation of the mutual inductance relay module into the housing 10.

[0088] Specifically, the first limiting structure 14a1 is located near the initial insertion position of the mutual inductor relay module and has a relatively large guide gap, which is used to initially accept the mutual inductor relay module and correct its posture; the second limiting structure 14a2 is located near the installation termination position and has a relatively small gap, which is used to further limit the offset of the mutual inductor relay module during the gradual advancement process, thereby facilitating the accurate alignment of the mutual inductor relay module with the predetermined installation position in the housing 10.

[0089] By cooperating with the first limiting structure 14a1 and the second limiting structure 14a2, phased assembly guidance can be achieved to a certain extent, improving the installation efficiency and positioning accuracy of the mutual inductance relay module, and reducing the risk of structural interference or electrical connection errors caused by misaligned insertion.

[0090] For example, the first limiting structure 14a1 and the second limiting structure 14a2 can be different protrusions disposed on the inner surface of the housing 10. For example, the first limiting structure 14a1 has a greater height than the second limiting structure 14a2, that is, its protrusion from the surface of the housing 10 is larger, so that it can guide the mutual inductor relay module at the initial stage of installation and achieve initial limiting; the second limiting structure 14a2 contacts the mutual inductor relay module as it is further advanced, and is used to achieve more precise limiting guidance.

[0091] Through the above-described configuration, the mutual inductance relay module can sequentially engage with the first limiting structure 14a1 and the second limiting structure 14a2 during installation, thereby improving the guidance and stability of the mutual inductance relay module installation to a certain extent. It can be understood that the first limiting structure 14a1 and the second limiting structure 14a2 can also be distributed in different directional positions to respectively contact different sidewalls of the mutual inductance relay module, thus restricting the position of the mutual inductance relay module in multiple directions, which is beneficial for improving assembly accuracy and enhancing structural stability.

[0092] In some embodiments, refer to Figure 4 , Figure 5 The second positioning part 11 includes a first positioning structure 11a disposed on the housing 10. The first positioning structure 11a is used to cooperate with the electrical connection terminal 210 of the relay 200 to define the position of the electrical connection terminal 210 relative to the housing 10. This achieves structural positioning of the electrical connection terminal 210, facilitating the stable and reliable establishment of its electrical connection with the circuit board 20.

[0093] In some embodiments, the second positioning part 11 includes a second positioning structure 11b disposed on the housing 10. The second positioning structure 11b is used to cooperate with the current transformer 100 to define the position of the current transformer 100 relative to the housing 10. Through the second positioning structure 11b, the spatial position of the current transformer 100 within the housing 10 can be effectively restricted after the current transformer 100 is installed, thereby improving the fitting accuracy between the current transformer 100 and other components.

[0094] In some embodiments, the second positioning part 11 includes a third positioning structure 11c disposed on the housing 10. The third positioning structure 11c is used to cooperate with the relay 200 to define the position of the relay 200 relative to the housing 10. This allows the relay 200 to remain in a stable state after installation, reducing the risk of structural displacement that may occur due to changes in the usage environment.

[0095] By setting the first positioning structure 11a, the second positioning structure 11b, and the third positioning structure 11c, structural limitations can be made for the electrical connection terminal 210, the transformer 100, and the relay 200, thereby effectively maintaining the predetermined position of each component relative to the housing 10 without relying on additional fasteners, and improving the overall structural stability and electrical connection reliability of the transformer relay module.

[0096] For example, the first positioning structure 11a, the second positioning structure 11b, and the third positioning structure 11c are respectively mounting areas formed by protrusions disposed on the housing 10. The protrusions form defined areas within the housing 10 for mounting the electrical connection terminal 210, the relay 200, and the current transformer 100. Through the above structural design, suitable mounting positions for the electrical connection terminal 210, the relay 200, and the current transformer 100 can be pre-set within the housing 10, thereby facilitating the stable relative positioning of each device with the housing 10 and providing a structural basis for subsequent electrical connections or overall assembly.

[0097] In some embodiments, refer to Figure 6 , Figure 7 The electricity meter also includes a circuit board 20, and the housing 10 includes a third positioning part 12, which cooperates with the circuit board 20 to define the position of the circuit board 20 relative to the housing 10. This allows the circuit board 20 to be stably held in a predetermined installation position, facilitating the electrical connection with the mutual inductance relay module.

[0098] In some embodiments, during the installation of the circuit board 20, the circuit board 20 sequentially engages with the third positioning part 12 and the first positioning part 130 of the relay 200 to position the circuit board 20 on the housing 10 and align it with the mutual inductance relay module. That is, in the initial stage of installation, the circuit board 20 first engages with the third positioning part 12 to achieve preliminary positioning, thereby guiding the circuit board 20 towards a predetermined direction; subsequently, the circuit board 20 continues to engage with the first positioning part 130 to achieve precise positioning relative to the relay 200, which helps ensure the alignment between the electrical connection terminal 210 and the electrical connection hole.

[0099] By providing the third positioning part 12, the circuit board 20 can be initially guided during the initial installation process, allowing it to gradually align as it approaches the housing 10. This facilitates accurate positioning of the circuit board 20 and the current inductor relay module installed within the housing 10. For example, the third positioning part 12 can be a protrusion on the inner surface of the housing 10, with a height higher than the current inductor relay module installed within the housing 10. This allows the circuit board 20 to begin the alignment process upon contact with the third positioning part 12, improving assembly efficiency and accuracy.

[0100] In some embodiments, refer to Figure 8 , Figure 9The electricity meter also includes a wiring component 30. The housing 10 has an opening 13, and the wiring component 30 is installed in the opening 13. The opening 13 is used to accommodate the wiring component 30 and form an interface structure for external connection of the electricity meter. By providing the opening 13, the installation operation of the wiring component 30 can be simplified to a certain extent, making it easier for the wiring component 30 to be inserted from outside the housing 10 to the predetermined position, thereby improving assembly efficiency and ensuring the fixation and functional reliability of the wiring component 30.

[0101] According to the third aspect of this disclosure, referring to Figures 4 to 9 A method for assembling an electricity meter is provided for installing the electricity meter in the above embodiments, comprising the following steps: S10. Assemble the current transformer 100 and the relay 200 into a current transformer relay module.

[0102] S20. Install the mutual inductance relay module into the housing 10.

[0103] It is understandable that assembling the current transformer 100 and the relay 200 into a current transformer relay module can enable the entire module to be installed into the housing 10, which is beneficial to improving installation efficiency and reducing installation difficulty.

[0104] S30. Install the circuit board 20 into the housing 10.

[0105] In some embodiments, step S20 includes: S21. The current transformer 100 is engaged with the second positioning structure 11b to define the position of the current transformer 100 relative to the housing 10.

[0106] S22. The relay 200 is engaged with the third positioning structure 11c to limit the position of the relay 200 relative to the housing 10.

[0107] S23. The electrical connection terminal 210 of the relay 200 is engaged with the first positioning structure 11a to guide the mutual inductance relay module to be installed into the housing 10.

[0108] It is understandable that during the installation of the mutual inductance relay module into the housing 10, the electrical connection terminal 210, the current transformer 100 and the relay 200 are positioned by setting the first positioning structure 11a, the second positioning structure 11b and the third positioning structure 11c respectively, which is beneficial to improving the stability and reliability of the installation.

[0109] In some embodiments, step S30 includes: S31. Make the circuit board 20 cooperate with the third positioning part 12 to guide the circuit board 20 and the mutual inductance relay module to make preliminary alignment. S32. The circuit board 20 is made to cooperate with the first positioning part 130 to guide the circuit board 20 to be further aligned with the mutual inductance relay module, thereby helping to ensure electrical connection accuracy and improve assembly consistency and reliability.

[0110] It is understandable that after the circuit board 20 is installed in place, electrical connections between the pins on the current transformer 100 and the relay 200 and the circuit board 20 can be achieved through soldering and other means, thereby ensuring the electrical connection stability of the energy meter.

[0111] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0112] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0113] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0114] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A mutual inductance relay module, characterized in that, include: Current transformer (100); and A relay (200) is detachably connected to the current transformer (100).

2. The mutual inductance relay module according to claim 1, characterized in that, The relay (200) includes an electrical connection terminal (210), and the current transformer (100) is provided with a positioning hole (110). The electrical connection terminal (210) is detachably inserted into the positioning hole (110) to realize the detachable connection between the current transformer (100) and the relay (200).

3. The mutual inductance relay module according to claim 2, characterized in that, The electrical connection terminal (210) and the positioning hole (110) are in clearance fit; And / or, the current transformer (100) is provided with at least two of the positioning holes (110).

4. The mutual inductance relay module according to claim 3, characterized in that, The number of positioning holes (110) is 2, 3 or 4; And / or, the number of the relays (200) is the same as the number of the positioning holes (110).

5. The mutual inductance relay module according to claim 2, characterized in that, The electrical connection terminal (210) is integrated with the relay (200), with one end of the electrical connection terminal (210) located at one end of the relay (200) and the other end of the electrical connection terminal (210) located at the other end of the relay (200).

6. The mutual inductance relay module according to claim 2, characterized in that, The electrical connection terminal (210) is provided with a positioning groove (211), which is used to cooperate with the housing (10) to define the position of the electrical connection terminal (210) relative to the housing (10).

7. The mutual inductance relay module according to claim 6, characterized in that, The positioning groove (211) is disposed at the end of the electrical connection terminal (210).

8. The mutual inductance relay module according to claim 3, characterized in that, The current transformer (100) is provided with an anti-static part (120), which is located between adjacent relays (200) to isolate the electrical connection terminals (210) of adjacent relays (200).

9. The mutual inductance relay module according to claim 8, characterized in that, The antistatic part (120) includes a protruding ridge protruding from the surface of the current transformer (100).

10. The mutual inductance relay module according to claim 1, characterized in that, The relay (200) includes a sampling terminal (220) and a reinforcement member (230) for reinforcing the sampling terminal (220).

11. The mutual inductance relay module according to claim 10, characterized in that, The sampling terminal (220) is made of an alloy with elastic properties.

12. The mutual inductance relay module according to claim 10, characterized in that, The reinforcement (230) is used to fix the sampling terminal (220) close to its free end side.

13. The mutual inductance relay module according to claim 12, characterized in that, The sampling terminal (220) includes a main body segment (221) and a pin segment (222). The width of the pin segment (222) is smaller than the width of the main body segment (221). The reinforcement member (230) is used to connect to the end of the main body segment (221) near the pin segment (222).

14. The mutual inductance relay module according to claim 1, characterized in that, The current transformer (100) includes a first positioning part (130), which is used to guide the circuit board (20) to align with the current transformer relay module so that the circuit board (20) can be inserted into a predetermined position. And / or, the current transformer (100) includes a snap-fit ​​portion (140) for guiding the circuit board (20) to align with the current transformer relay module, so that the circuit board (20) is inserted into a predetermined position and then snapped and fixed with the snap-fit ​​portion (140).

15. The mutual inductance relay module according to claim 14, characterized in that, The first positioning part (130) includes a positioning post (131) that protrudes from the surface of the current transformer (100); And / or, the snap-fit ​​portion (140) includes a snap (141) that protrudes from the surface of the current transformer (100).

16. An electricity meter, characterized in that, Includes the mutual inductance relay module as described in any one of claims 1-15.

17. The electricity meter according to claim 16, characterized in that, The electricity meter also includes a housing (10), wherein: The housing (10) includes a second positioning part (11) for contacting the side wall of the mutual inductance relay module to define the position of the mutual inductance relay module relative to the housing (10); And / or, the housing (10) includes a limiting part (14) for guiding the mutual inductance relay module to be installed in the housing (10).

18. The electricity meter according to claim 17, characterized in that, The limiting part (14) includes at least two limiting structures (14a), which are used to cooperate with the mutual inductance relay module to provide limiting guidance for the mutual inductor (100) and the relay (200) during the installation of the mutual inductance relay module.

19. The electricity meter according to claim 18, characterized in that, At least two of the limiting structures (14a) are arranged sequentially along the installation direction of the mutual inductance relay module. During the process of installing the mutual inductance relay module into the housing (10), at least two of the limiting structures (14a) are used to guide the mutual inductance relay in sequence so that the mutual inductance relay module is installed in the housing (10).

20. The electricity meter according to claim 19, characterized in that, The gap between at least two of the limiting structures (14a) and the mutual inductance relay module gradually decreases along the installation direction.

21. The electricity meter according to claim 18, characterized in that, There are two limiting structures (14a), namely a first limiting structure (14a1) and a second limiting structure (14a2).

22. The electricity meter according to claim 17, characterized in that, The second positioning part (11) includes a first positioning structure (11a) disposed on the housing (10), the first positioning structure (11a) being used to cooperate with the electrical connection terminal (210) of the relay (200) to define the position of the electrical connection terminal (210) relative to the housing (10); And / or, the second positioning part (11) includes a second positioning structure (11b) disposed on the housing (10), the second positioning structure (11b) being used to cooperate with the current transformer (100) to define the position of the current transformer (100) relative to the housing (10); And / or, the second positioning part (11) includes a third positioning structure (11c) disposed on the housing (10), the third positioning structure (11c) being used to cooperate with the relay (200) to define the position of the relay (200) relative to the housing (10).

23. The electricity meter according to claim 17, characterized in that, The electricity meter also includes a circuit board (20), and the housing (10) also includes a third positioning part (12), which is used to cooperate with the circuit board (20) to define the position of the circuit board (20) relative to the housing (10).

24. The electricity meter according to claim 23, characterized in that, During the installation of the circuit board (20), the circuit board (20) cooperates sequentially with the third positioning part (12) and the first positioning part (130) of the relay (200) so that the circuit board (20) is positioned on the housing (10) and aligned with the mutual inductance relay module.

25. The electricity meter according to claim 17, characterized in that, The electricity meter also includes a wiring component (30), and the housing (10) is provided with an opening (13), and the wiring component (30) is installed in the opening (13).

26. A method for assembling an electricity meter, characterized in that, For installing the electricity meter according to any one of claims 16-25, the following steps are included: The current transformer (100) and the relay (200) are assembled to form a current transformer relay module; Install the mutual inductance relay module into the housing (10); The circuit board (20) is mounted to the housing (10).

27. The method for assembling an electricity meter according to claim 26, characterized in that, The process of installing the mutual inductance relay module into the housing (10) includes: The mutual inductor (100) is made to cooperate with the second positioning structure (11b); The relay (200) is then engaged with the third positioning structure (11c). The electrical connection terminal (210) of the relay (200) is engaged with the first positioning structure (11a) to guide the mutual inductance relay module to be installed into the housing (10).

28. The method for assembling an electricity meter according to claim 26, characterized in that, The mounting of the circuit board (20) to the housing (10) includes: The circuit board (20) is made to cooperate with the third positioning part (12) to guide the circuit board (20) and the mutual inductance relay module to be initially aligned; The circuit board (20) is engaged with the first positioning part (130) to guide the circuit board (20) to be further aligned with the mutual inductance relay module.

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