Transformer and electric energy meter

Abstract

This application relates to a current transformer and an energy meter. The current transformer includes a housing, a mounting bracket, and lead-out pins. The housing has a receiving cavity and a lead-out hole, which communicate with each other. The mounting bracket is disposed within the receiving cavity. The lead-out pins are mounted on the mounting bracket, with one end of the lead-out pin located within the receiving cavity and the other end of the lead-out pin extending out of the housing through the lead-out hole. During assembly, the mounting bracket is placed within the receiving cavity, and the lead-out pins are inserted through the lead-out hole. The mounting bracket and the portion of the housing with the lead-out hole cooperate to form a leak-proof adhesive structure. By setting up the leak-proof adhesive structure, the flow path of the adhesive can be extended, and the flow resistance of the adhesive can be increased, so that the adhesive solidifies before it leaks out of the lead-out hole. This achieves the purpose of preventing adhesive leakage, not only keeping the product appearance clean, but also preventing the lead-out pins from being covered by adhesive, which would increase the contact resistance and ensure the accuracy and stability of current measurement. This reduces rework and improves assembly efficiency.

Description

Technical Field

[0001] This application relates to the field of electronic instrumentation technology, and in particular to current transformers and energy meters. Background Technology

[0002] An electricity meter is an electronic instrument that samples the current and voltage supplied to the user in real time, processes and multiplies the sampled voltage and current signals to convert them into pulse outputs proportional to electrical energy, and then displays the output through a counter or digital display.

[0003] In practical applications, instrument transformers are often used to sample the current and voltage supplied to users in real time. During the manufacturing process of instrument transformers, after the internal components are assembled, adhesive is poured into the transformer for sealing to ensure its insulation and stability. However, before the adhesive cures, it is prone to leaking along the leads, affecting not only the appearance of the transformer but also, in severe cases, encasing the leads, increasing contact resistance, and consequently affecting the accuracy and stability of current measurement. Such problems often require rework, significantly reducing assembly efficiency. Summary of the Invention

[0004] Therefore, it is necessary to provide a current transformer and an energy meter that can reduce rework and improve assembly efficiency.

[0005] In a first aspect, this application provides a current transformer, comprising:

[0006] The housing has a receiving cavity and an outlet hole, the receiving cavity being in communication with the outlet hole;

[0007] A fixing bracket, wherein the fixing bracket is disposed within the receiving cavity; and

[0008] The lead-out foot is mounted on the fixing frame, with one end of the lead-out foot located inside the receiving cavity and the other end passing through the lead-out hole to the outside of the housing;

[0009] The housing and the fixing frame are provided with at least one of the insertion groove and at least one of the insertion protrusions. The insertion protrusion is provided in the insertion groove to form a leak-proof adhesive structure, which is used to extend the flow path of the adhesive.

[0010] During assembly of the aforementioned current transformer, the mounting bracket is placed within the receiving cavity, and the leads are inserted into the lead-out holes. Simultaneously, a mating protrusion and a mating slot are engaged. Specifically, after the protrusion is inserted into the slot, a multi-turn mating gap is formed between them. This mating gap is not a straight channel, but a meandering path shared by the protrusion and the slot wall. When adhesive leaks along the gap between the mounting bracket and the housing, the adhesive must pass through this meandering mating gap to lengthen the flow path and increase the flow resistance. This allows the adhesive to solidify before leaking out of the lead-out holes, preventing leakage. This not only maintains a clean product appearance but also prevents the leads from being covered by adhesive, thus increasing contact resistance and ensuring the accuracy and stability of current measurement. Furthermore, it reduces rework and improves assembly efficiency.

[0011] In one embodiment, the peripheral wall of the outlet hole extends into the receiving cavity to form the insertion protrusion; the fixing frame includes a frame body and a sleeve portion, the sleeve portion being disposed on the side of the frame body facing the outlet hole, and the sleeve portion being sleeved on the insertion protrusion.

[0012] In one embodiment, the end face of the socket facing away from the frame is fitted against the bottom wall of the housing; and / or, the inner surface of the socket is fitted against the outer surface of the insertion protrusion; and / or, the end face of the insertion protrusion near the frame is fitted against the frame.

[0013] In one embodiment, the fixing frame further includes a fixing part, which is disposed on the side of the frame facing the outlet hole. The fixing part is disposed in the outlet hole, and the frame, the sleeve part and the fixing part surround and form the insertion groove. At least a portion of the outlet foot passes through the fixing part.

[0014] In one embodiment, the fixing part is interference-fitted with the outlet hole.

[0015] In one embodiment, the end face of the sleeve facing away from the frame is flush with the inner surface of the bottom wall of the housing, and the end face of the fixing part facing away from the frame is flush with the outer surface of the bottom wall.

[0016] In one embodiment, the fixing bracket is provided with a fixing hole, at least a portion of which is located in the fixing part and extends through the fixing part along its extension direction, and the lead-out foot is interference-fitted with the wall of the fixing hole.

[0017] In one embodiment, the fixing frame is further provided with a guide hole, which is located on the frame body and coaxially arranged with the fixing hole.

[0018] In one embodiment, the diameter of the guide hole gradually increases in the direction from the fixing hole to the guide hole.

[0019] Secondly, this application also provides an electricity meter that includes the current transformer described above.

[0020] During assembly, the aforementioned electricity meter has its mounting bracket placed within the receiving cavity, with the lead-out pins inserted through the lead-out holes. Simultaneously, a mating protrusion and a mating slot are engaged. Specifically, after the protrusion is inserted into the slot, a multi-turn mating gap is formed between them. This mating gap is not a straight channel, but rather a meandering path shared by the protrusion and the slot wall. When adhesive leaks along the gap between the mounting bracket and the housing, the adhesive must pass through this meandering mating gap, extending its flow path and increasing its flow resistance. This allows the adhesive to solidify before leaking out of the lead-out holes, preventing leakage. This not only maintains a clean product appearance but also prevents the lead-out pins from being covered by adhesive, thus increasing contact resistance and ensuring the accuracy and stability of current measurement. Furthermore, it reduces rework and improves assembly efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a current transformer according to an embodiment of this application.

[0022] Figure 2 for Figure 1 The diagram shows the structure of the current transformer after assembly of the housing, mounting bracket, and lead-out pins.

[0023] Figure 3 for Figure 2 The top view of the mutual inductor shown.

[0024] Figure 4 for Figure 3 Sectional view along the middle AA.

[0025] Figure 5 for Figure 4 A magnified view of a portion of point A in the middle.

[0026] Figure 6 This is a schematic diagram of the housing of a current transformer according to an embodiment of this application.

[0027] Figure 7 This is a schematic diagram of the mounting frame of a current transformer according to an embodiment of this application.

[0028] Figure 8 for Figure 7 A cross-sectional view along the middle BB.

[0029] Figure 9 This is a schematic diagram of the structure of a current transformer according to another embodiment of this application.

[0030] Figure 10 for Figure 9 The diagram shows the structure of the current transformer after assembly of the housing, mounting bracket, and lead-out pins.

[0031] Figure 11 for Figure 10 The top view of the mutual inductor shown.

[0032] Figure 12 for Figure 11 A sectional view along the center CC.

[0033] Figure 13 for Figure 12 A magnified view of a portion of point B in the middle.

[0034] Figure 14 This is a schematic diagram of the housing of a current transformer according to another embodiment of this application.

[0035] Figure 15 This is a schematic diagram of the mounting frame of a current transformer according to another embodiment of this application.

[0036] Figure 16 for Figure 15 A sectional view along the middle DD.

[0037] Explanation of icon numbers:

[0038] 1. Current transformer; 10. Housing; 11. Bottom wall; 111. Lead-out hole; 112. Guide part; 12. Side wall; 13. Receiving cavity; 14. Opening; 20. Lead-out foot; 30. Fixing bracket; 31. Frame body; 311. Insertion hole; 3111. Fixing hole; 3112. Guide hole; 32. Leak-proof adhesive structure; 321. Sleeve part; 322. Fixing part; 323. Insertion groove; 324. Insertion protrusion. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] An embodiment of this application provides an electricity meter including a meter housing and a current transformer 1. The current transformer 1 is disposed inside the meter housing. The current transformer 1 can be either a current transformer or a voltage transformer.

[0041] An electricity meter is an electronic instrument. The current transformer 1 samples the current and voltage supplied to the user in real time, processes the sampled voltage and current signals, multiplies them, and converts them into pulse outputs that are proportional to the electrical energy. The outputs are then displayed through a counter or digital display.

[0042] See Figure 1 , Figure 2 , Figure 6 , Figure 9 , Figure 10 and Figure 14 , Figure 1 A schematic diagram of the structure of a current transformer according to an embodiment of this application is shown. Figure 2 It shows Figure 1 The diagram shown is a structural schematic of the current transformer from another perspective. Figure 6 This paper shows a schematic diagram of the housing of a current transformer according to an embodiment of this application. Figure 9 A schematic diagram of the structure of a current transformer according to another embodiment of this application is shown. Figure 10 It shows Figure 9 The diagram shows the assembled structure of the current transformer housing, mounting bracket, and leads. Figure 14 A schematic diagram of the housing of a current transformer according to another embodiment of this application is shown. The current transformer 1 includes a housing 10 and lead-out pins 20. The housing 10 is provided with a receiving cavity 13 and a lead-out hole 111 communicating with the receiving cavity 13. The lead-out pins 20 pass through the lead-out hole 111, with a portion of the lead-out pins 20 located inside the receiving cavity 13 and another portion located outside the receiving cavity 13.

[0043] Specifically, the housing 10 includes a bottom wall 11 and a side wall 12, with the bottom wall 11 and the side wall 12 connected to form a receiving cavity 13 with an opening 14. An outlet hole 111 is provided on the bottom wall 11.

[0044] Optionally, lead 20 can be a lead for a coil. Of course, lead 20 can also be a lead for other components, and is not limited thereto.

[0045] After the components inside the housing 10 are assembled, glue is poured into the housing 10 for sealing. After curing, a complete glued surface is formed, achieving a full-coverage seal for the components inside the housing 10. In this way, the traditional cover plate assembly can be eliminated, simplifying the assembly process while improving the product's sealing performance and structural compactness.

[0046] However, during the potting and sealing process, and before the adhesive cures, the following problems exist: Firstly, the adhesive is prone to leakage along the leads; secondly, the adhesive can easily flow out from the gap between the mounting bracket and the housing. If the adhesive accumulates at the bottom of the housing, it will leak out from there. This not only affects the appearance quality of the transformer, but in severe cases, it can also wrap around the leads, leading to increased contact resistance and consequently affecting the accuracy and stability of current measurement. Such problems often require rework, significantly reducing assembly efficiency.

[0047] To solve the above problems, see Figure 3 , Figure 4 , Figure 12 and Figure 13 , Figure 3 It shows Figure 2 The top view of the mutual inductor shown is shown. Figure 4 It shows Figure 3 Sectional view along AA, Figure 12 It shows Figure 11 Sectional view along CC, Figure 13 It shows Figure 12 A partially enlarged schematic diagram at point B. The current transformer 1 also includes a mounting bracket 30, which is disposed within the receiving cavity 13. Lead-out feet 20 are mounted on the mounting bracket 30, and the mounting bracket 30 and the housing 10 are configured with a leak-proof adhesive structure 32 corresponding to the lead-out hole 111.

[0048] It should be noted that the portion of the housing 10 corresponding to the outlet hole 111 includes the outlet hole 111 and its wall, the surrounding area of ​​the outlet hole 111, etc.

[0049] During assembly, the mounting bracket 30 is placed inside the receiving cavity 13, and the lead-out foot 20 passes through the lead-out hole 111. The mounting bracket 30 and the housing 10, corresponding to the lead-out hole 111, cooperate to form a leak-proof adhesive structure 32. By setting the leak-proof adhesive structure 32, a meandering path is formed around the lead-out hole 111. When adhesive leaks along the gap between the mounting bracket 30 and the housing 10, the adhesive passes through the meandering path, which prolongs the flow path of the adhesive and increases the flow resistance of the adhesive. This allows the adhesive to solidify before it leaks out of the lead-out hole 111, thus preventing adhesive leakage. This not only keeps the product appearance clean but also prevents the lead-out foot 20 from being covered by adhesive, which would increase the contact resistance and ensure the accuracy and stability of current measurement. This reduces rework and improves assembly efficiency.

[0050] In one embodiment, at least one of the housing 10 and the fixing frame 30 is provided with a insertion groove 323, and at least the other of the housing 10 and the fixing frame 30 is provided with an insertion protrusion 324. The insertion protrusion 324 is disposed in the insertion groove 323 to form a leak-proof adhesive structure 32.

[0051] For example, see Figure 5 , Figure 6 , Figure 8 , Figure 13 , Figure 14 and Figure 16 , Figure 5 It shows Figure 4 A magnified view of a portion of point A in the diagram. Figure 6 This paper shows a schematic diagram of the housing of a current transformer according to an embodiment of this application. Figure 8 It shows Figure 7 Sectional view along BB. Figure 13 It shows Figure 12 A magnified view of a portion of point B in the diagram. Figure 14 A schematic diagram of the housing of a current transformer according to another embodiment of this application is shown. Figure 16 It shows Figure 15 Cross-sectional view along the middle DD. The fixing bracket 30 is provided with a plug-in groove 323, and the housing 10 is provided with a plug-in protrusion 324, which is located in the plug-in groove 323.

[0052] Optionally, the insertion protrusion 324 and the insertion slot 323 cooperate to form a U-shaped, V-shaped or W-shaped spiral path.

[0053] The insertion protrusion 324 and insertion groove 323 are fitted together. Specifically, after the insertion protrusion 324 is inserted into the insertion groove 323, a multi-turn fitting gap is formed between them. This fitting gap is not a straight channel, but a meandering path formed by the shared walls of the insertion protrusion 324 and the insertion groove 323. When the adhesive leaks along the gap between the fixing frame 30 and the housing 10, the adhesive must pass through this tortuous fitting gap to extend the flow path of the adhesive and increase the flow resistance of the adhesive, so that the adhesive solidifies before leaking out of the lead hole 111, thereby preventing adhesive leakage. This not only keeps the product appearance clean, but also prevents the lead 20 from being covered by adhesive, which would increase the contact resistance and ensure the accuracy and stability of current measurement; at the same time, it reduces rework and improves assembly efficiency. In addition, the structure of the insertion protrusion 324 embedded in the insertion groove 323 plays a pre-positioning and guiding role during assembly, improving assembly accuracy and efficiency.

[0054] In one embodiment, see Figure 12 , Figure 13 and Figure 14 The wall of the lead-out hole 111 extends into the receiving cavity 13 to form a plug-in protrusion 324. Specifically, the wall of the lead-out hole 111 extends from the bottom wall 11 toward the direction close to the opening 14, and the plug-in protrusion 324 is annular.

[0055] Of course, in other embodiments, a plug-in protrusion 324 may also be provided on the outer periphery of the lead-out hole 111.

[0056] Further, see Figure 13 , Figure 14 and Figure 16 , Figure 13 It shows Figure 12 A magnified view of a portion of point B in the diagram. Figure 14 A schematic diagram of the housing of a current transformer according to another embodiment of this application is shown. Figure 16 It shows Figure 15 Cross-sectional view along the middle DD. The fixing bracket 30 includes a bracket body 31 and a sleeve part 321. The sleeve part 321 is provided on the side of the bracket body 31 facing the lead-out hole 111. The sleeve part 321 is annular and is sleeved on the outside of the insertion protrusion 324.

[0057] After the components inside the housing 10 are assembled, glue is poured into the housing 10 for sealing. If the glue accumulates at the bottom of the housing 10, the flow path of the glue is as follows: the gap between the sleeve part 321 and the bottom wall 11, the gap between the inner surface of the sleeve part 321 and the outer surface of the insertion protrusion 324, and the gap between the top of the insertion protrusion 324 and the frame 31. In this way, the flow path of the glue is increased, thereby preventing glue leakage.

[0058] Optionally, the end face of the socket 321 facing away from the frame 31 is fitted against the bottom wall 11. In this way, the assembly gap between the socket 321 and the bottom wall 11 can be eliminated, so that the socket 321 and the bottom wall 11 form a surface contact sealing interface, effectively blocking the flow of adhesive and preventing adhesive leakage.

[0059] Optionally, the inner surface of the socket 321 is fitted to the outer surface of the insertion protrusion 324. This eliminates the assembly gap between the inner surface of the socket 321 and the outer surface of the insertion protrusion 324, forming a surface-contact sealing interface between the inner surface of the socket 321 and the outer surface of the insertion protrusion 324, effectively blocking the flow of adhesive and preventing leakage.

[0060] Optionally, the end face of the insertion protrusion 324 near the frame 31 is fitted to the frame 31. This eliminates the assembly gap between the insertion protrusion 324 and the frame 31, forming a sealed interface with surface contact between the insertion protrusion 324 and the frame 31, effectively blocking the flow of adhesive and preventing leakage.

[0061] In one embodiment, see Figure 5 , Figure 7 and Figure 8 , Figure 5 It shows Figure 4 A magnified view of a portion of point A in the diagram. Figure 7 A schematic diagram of the mounting frame of a current transformer according to an embodiment of this application is shown. Figure 8 It shows Figure 7A cross-sectional view along the center line BB. The mounting bracket 30 also includes a fixing part 322. The fixing part 322 is located on the side of the bracket body 31 facing the outlet hole 111. Exemplarily, the fixing part 322 includes a fixing post, the diameter of which is slightly larger than the diameter of the outlet hole 111, so that the fixing post and the outlet hole 111 are interference-fitted. The fixing part 322 is located within the space formed by the sleeve part 321. The fixing part 322 is located within the outlet hole 111, and the bracket body 31, the sleeve part 321, and the fixing part 322 form an insertion groove 323. At least a portion of the outlet foot 20 passes through the fixing part 322, and at least a portion of the outlet foot 20 is wrapped by the fixing part 322. During assembly, the fixing part 322 is inserted into the outlet hole 111, and the outer surface of the fixing part 322 fits against the inner surface of the sleeve part 321, thereby achieving reliable installation of the mounting bracket 30.

[0062] After the components inside the housing 10 are assembled, adhesive is poured into the housing 10 for sealing. If the adhesive accumulates at the bottom of the housing 10, the flow path of the adhesive is as follows: the gap between the sleeve part 321 and the bottom wall 11, the gap between the inner surface of the sleeve part 321 and the outer surface of the insertion protrusion 324, the gap between the top of the insertion protrusion 324 and the frame 31, and the gap between the inner surface of the insertion protrusion 324 and the outer surface of the fixing part 322. In this way, the possible flow path of the adhesive can be extended, which helps to achieve the function of preventing adhesive leakage.

[0063] Of course, in other embodiments, see [reference] Figure 13 , Figure 14 and Figure 16 In the middle, the fixing bracket 30 may not have a fixing part 322, but only a sleeve part 321. The sleeve part 321 and the insertion protrusion 324 formed by extending from the peripheral wall of the lead-out hole 111 are inserted and cooperate to form a leak-proof glue structure 32.

[0064] In one embodiment, the fixing part 322 is interference-fitted with the lead-out hole 111. This interference fit creates a reliable sealing interface between the fixing part 322 and the inner surface of the insertion protrusion 324, effectively preventing uncured adhesive from leaking along the lead-out pin 20, improving product assembly yield, and ensuring the detection accuracy and long-term stability of the current transformer 1. Simultaneously, it enables seamless installation, effectively eliminating the risk of loosening due to assembly tolerances and ensuring the long-term positioning stability of the lead-out pin 20 during insertion and removal tests.

[0065] In one embodiment, see Figure 7 and Figure 8 , Figure 7 A schematic diagram of the mounting frame of a current transformer according to an embodiment of this application is shown. Figure 8 It shows Figure 7A cross-sectional view along the middle BB. The length of the fixing part 322 is greater than the length of the sleeve part 321. This maximizes the length of the fixing part 322 within a limited space, improving the installation stability and anti-insertion and extraction capability of the fixing bracket 30; it also enhances the adhesive-resistant sealing effect, preventing poor contact caused by adhesive leakage; in addition, by increasing the length of the fixing part 322, the contact area between the fixing part 322 and the lead-out foot 20 can be increased, thereby improving the restraint force on the lead-out foot 20 and preventing deformation of the lead-out foot 20.

[0066] For example, see Figure 4 and Figure 5 , Figure 4 It shows Figure 3 Sectional view along AA, Figure 5 It shows Figure 4 A partially enlarged schematic diagram of point A. The end face of the sleeve part 321 facing away from the frame 31 is flush with the inner surface of the bottom wall 11, and the end face of the fixing part 322 facing away from the frame 31 is flush with the outer surface of the bottom wall 11.

[0067] Of course, in other embodiments, the length of the fixing part 322 may be equal to the length of the sleeve part 321; or the length of the fixing part 322 may be less than the length of the sleeve part 321.

[0068] In one embodiment, see Figure 4 , Figure 5 and Figure 8 , Figure 4 It shows Figure 3 Sectional view along AA, Figure 5 It shows Figure 4 A magnified view of a portion of point A in the diagram. Figure 8 It shows Figure 7 A cross-sectional view along the center BB. The mounting bracket 30 is provided with an insertion hole 311, which extends through the bracket body 31 and the fixing part 322 along the direction from the bottom wall 11 to the opening 14. In this way, the wall of the insertion hole 311 can effectively constrain the spatial position of the lead 20 during potting and use, preventing the lead 20 from shifting due to glue flow or external vibration; at the same time, the wall of the insertion hole 311 forms a wrap-around protection for the lead 20, which can buffer the impact of external insertion and extraction forces on the lead 20, thereby extending the fatigue life of the product.

[0069] Further, see Figure 7 and Figure 8 , Figure 7 A schematic diagram of the mounting frame of a current transformer according to an embodiment of this application is shown. Figure 8 It shows Figure 7A cross-sectional view along the middle BB. The insertion hole 311 includes a fixing hole 3111. At least a portion of the fixing hole 3111 is provided in the fixing portion 322 and extends through the fixing portion 322 along its extending direction. The lead-out foot 20 is interference-fitted with the wall of the fixing hole 3111. For example, see [reference needed]. Figure 7 and Figure 8 , Figure 7 A schematic diagram of the mounting frame of a current transformer according to an embodiment of this application is shown. Figure 8 It shows Figure 7 Cross-sectional view along the center BB. Fixing hole 3111 extends from fixing part 322 into frame 31.

[0070] In this embodiment, the length of the fixing hole 3111 is relatively long. On the one hand, it can extend the flow path of the adhesive along the lead-out pin 20, so that the adhesive has solidified before flowing out of the fixing hole 3111, thereby preventing adhesive leakage; on the other hand, it can increase the mating length between the lead-out pin 20 and the fixing hole 3111, improve the connection reliability, and reduce the risk of bending or breaking of the lead-out pin 20 due to force during subsequent insertion and removal operations.

[0071] Further, see Figure 7 and Figure 8 The insertion hole 311 also includes a guide hole 3112. The guide hole 3112 is provided on the frame 31 and located on one side of the extending direction of the fixing hole 3111. For example, the guide hole 3112 is provided on the side of the fixing hole 3111 away from the bottom wall 11, and the guide hole 3112 is coaxially arranged with the fixing hole 3111.

[0072] During the assembly of the lead-out pin 20 to the mounting bracket 30, the lead-out pin 20 first passes through the guide hole 3112 and then inserts into the mounting hole 3111. This design utilizes the guide hole 3112 to passively correct the insertion posture of the lead-out pin 20 in advance, effectively reducing alignment difficulty and improving assembly efficiency.

[0073] After the initial insertion is completed, the lead-out pin 20 enters the fixing hole 3111 and forms an interference fit with the fixing hole 3111. At this time, the wall of the fixing hole 3111 generates elastic deformation or radial extrusion force, thereby providing a continuous and uniform clamping force to the lead-out pin 20, ensuring the reliability of the connection between the two.

[0074] Thus, by arranging the guide hole 3112 and the fixing hole 3111 along the insertion direction, the guide hole 3112 can ensure the smooth assembly of the lead 20 and effectively prevent the lead 20 from falling off during subsequent insertion and removal from the PCB board, thereby improving the reliability of the lead 20.

[0075] In one embodiment, see Figure 4 and Figure 8In the direction from the fixing hole 3111 to the guide hole 3112, the diameter of the guide hole 3112 gradually increases, forming a guide slope. This guide slope can guide the lead-out pin 20 during insertion, and can automatically correct even slight positional deviations, improving assembly efficiency and operational error tolerance. At the same time, it can also prevent the lead-out pin 20 from being scratched or deformed due to hitting the hole wall of the fixing hole 3111 during insertion, thereby improving product yield.

[0076] It should be noted that the shapes of the guide hole 3112 and the fixing hole 3111 can be set according to actual needs. For example, the guide hole 3112 is frustum-shaped and the fixing hole 3111 is prism-shaped.

[0077] In one embodiment, two anti-leakage adhesive structures 32 are provided. Two leads 20 are also provided, with each lead 20 corresponding to one of the two anti-leakage adhesive structures 32. This allows for independent anti-leakage adhesive protection for each lead 20, effectively preventing adhesive leakage from one side and preventing glue creep between leads 20s. It also avoids the risk of increased contact resistance or decreased insulation due to sealant covering the leads 20, ensuring the long-term stability of current detection.

[0078] In one embodiment, see Figure 1 , Figure 1 A schematic diagram of a current transformer according to an embodiment of this application is shown. The housing 10 is provided with a guide portion 112, which is used for guiding and engaging with the PCB board. Exemplarily, the guide portion 112 includes a guide post disposed on the outer surface of the bottom wall 11, and the extending direction of the guide post is parallel to the extending direction of the lead-out pin 20. By providing the guide portion 112, during the assembly of the current transformer 1 and the PCB board, the guide portion 112 can provide precise positioning and guiding functions, effectively guiding the lead-out pin 20 into the corresponding hole on the PCB board, thereby improving assembly efficiency and accuracy.

[0079] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0080] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0081] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0082] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0083] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0084] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A transformer, characterized by include: The housing has a receiving cavity and an outlet hole, the receiving cavity being in communication with the outlet hole; A fixing frame is disposed within the receiving cavity; as well as The lead-out foot is mounted on the fixing frame, with one end of the lead-out foot located inside the receiving cavity and the other end passing through the lead-out hole to the outside of the housing; The housing and the fixing frame are provided with at least one of the insertion groove and at least one of the insertion protrusions. The insertion protrusions are provided in the insertion groove to form a leak-proof adhesive structure, which is used to extend the flow path of the adhesive.

2. The instrument transformer of claim 1, wherein, The peripheral wall of the lead-out hole extends into the receiving cavity to form the insertion protrusion; The fixing frame includes a frame body and a sleeve part. The sleeve part is located on the side of the frame body facing the outlet hole and is sleeved on the outside of the insertion protrusion.

3. The instrument transformer of claim 2, wherein, The end face of the socket facing away from the frame is fitted against the bottom wall of the housing; and / or, the inner surface of the socket is fitted against the outer surface of the insertion protrusion; and / or, the end face of the insertion protrusion near the frame is fitted against the frame.

4. The instrument transformer of claim 2, wherein, The fixing frame further includes a fixing part, which is located on the side of the frame facing the outlet hole. The fixing part is located inside the outlet hole. The frame, the sleeve part, and the fixing part surround and form the insertion groove. At least a portion of the outlet foot passes through the fixing part.

5. The instrument transformer of claim 4, wherein, The fixing part is interference-fitted with the lead-out hole.

6. The instrument transformer of claim 4, wherein, The end face of the sleeve portion facing away from the frame is flush with the inner surface of the bottom wall of the housing, and the end face of the fixing portion facing away from the frame is flush with the outer surface of the bottom wall.

7. The instrument transformer of claim 4, wherein, The fixing bracket is provided with a fixing hole, at least a portion of which is located in the fixing part and extends through the fixing part along its extension direction. The lead-out foot is interference-fitted with the wall of the fixing hole.

8. The instrument transformer of claim 7, wherein, The fixing frame is also provided with a guide hole, which is located on the frame body and is coaxially arranged with the fixing hole.

9. The current transformer according to claim 8, characterized in that, In the direction from the fixing hole to the guide hole, the diameter of the guide hole gradually increases.

10. An electricity meter, characterized in that, Including the current transformer as described in any one of claims 1 to 9.

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