Anti-loose mutual inductor shell and current transformer

Abstract

The present application relates to a kind of anti-loose mutual inductor shell and current transformer, shell body and plug-in piece are disclosed.The shell body is provided with through hole along the first direction, one side inner wall has first cooperation part, and the other side has first accommodating groove;Plug-in piece is inserted into the through hole along the first direction, and second cooperation part is provided with the side towards first cooperation part, and second accommodating groove is provided with the side towards first accommodating groove, and the two form the limiting space of clamping conductive part.Sliding slot is further provided in plug-in piece or inner wall, for the sliding of first and second cooperation parts.When plug-in piece is inserted, cooperation part slides along sliding slot until clamping or interference abuts, and locks conductive part.This scheme realizes accurate positioning and fixing by mechanical cooperation, simplifies production process, reduces labor and time cost.Dispense with glue fixing, not affected by adhesive aging and thermal expansion difference, ensure the stability of conductive part at different temperatures, improve the long-term operation reliability of mutual inductor, can effectively resist external force impact and vibration, prevent conductive part from loosening.

Description

Technical Field

[0001] This invention relates to the field of current transformer technology, and in particular to an anti-loosening current transformer housing and a current transformer. Background Technology

[0002] In the field of power electronics, through-hole current transformers are widely used in PCB board mounting scenarios due to their unique structure. To further optimize the installation process, customers often request that the primary copper component of the transformer be directly fixed inside the center hole. However, the inherent characteristics of the through-hole structure make it difficult to securely fix the primary copper component, making it impossible to accurately meet the dimensional requirements specified by customers. This causes great trouble for the installation and use of the transformer.

[0003] Currently, the industry generally uses traditional fixing methods to address this issue, which involve using specialized tooling to position the current transformer and copper components, and then fixing the copper components by applying glue through a central hole. However, this method has many drawbacks. The tooling increases upfront costs and preparation work, while the multiple processes of fixing, gluing, and finishing the appearance after the glue has solidified make the production process cumbersome and complex, significantly increasing labor and time costs. More importantly, the adhesive is prone to aging, and the different coefficients of thermal expansion between the copper components and the current transformer housing mean that temperature changes during equipment operation can easily cause the adhesive layer to crack, leading to unstable fixing of the copper components. Furthermore, the lack of mechanical rigidity in locking, relying solely on the adhesive's stickiness to maintain the connection, makes the copper components prone to loosening under external impact or vibration, severely affecting the performance and reliability of the current transformer.

[0004] Furthermore, the increased number of assembly steps and the repetitive errors in tooling positioning make it difficult to guarantee product accuracy consistency. Moreover, the adhesive-fixed method makes rework extremely difficult once a product malfunctions, requiring significant resources for disassembly and re-fixing, further increasing production costs and maintenance complexity. Summary of the Invention

[0005] The purpose of this invention is to disclose an anti-loosening current transformer housing and current transformer, which ensures the consistency of product accuracy and improves the long-term reliability of the current transformer through mechanical rigid locking.

[0006] To achieve the above objectives, the present invention discloses an anti-loosening transformer housing, comprising: a housing body having a through hole extending through itself along a first direction, a first mating part being provided on one inner wall of the through hole, and a first receiving groove being provided on the other side; a plug-in member being inserted into the through hole along the first direction, a second mating part being provided on the side of the plug-in member facing the first mating part, and a second receiving groove being provided on the side of the plug-in member facing the first receiving groove, the first receiving groove and the second receiving groove forming a limiting space for clamping a conductive component; a sliding groove is also provided on the plug-in member or the inner wall, the sliding groove being used for the first mating part or the second mating part to slide along the sliding groove; when the plug-in member is inserted into the through hole along the first direction, the first mating part or the second mating part slides along the sliding groove until the first mating part and the second mating part engage or are pressed together, at which point the conductive component in the limiting space is locked and fixed.

[0007] By adopting the above solution, the first mating part on the inner wall of the outer casing's through-hole and the second mating part on the connector engage with each other, such as by snapping or interference fit, achieving precise positioning and fixation of the connector and the outer casing body. This simplifies the production process and reduces labor and time costs. It abandons the glue-based fixing method and adopts a mechanical structure for fixation. When the first and second mating parts snap or interfere fit, the conductive components within the limiting space are locked and fixed, unaffected by adhesive aging and thermal expansion differences. This ensures that the conductive components are stably fixed under different temperature environments, improving the long-term operational reliability of the transformer and effectively resisting external impacts and vibrations, preventing the conductive components from loosening.

[0008] Furthermore, in the first mating part and the second mating part, one is an outwardly protruding locking protrusion, and the other is a locking groove adapted to engage with the locking protrusion. The sliding groove and the locking groove are spaced apart along the first direction so that when the connector is inserted, it slides sequentially from the sliding groove into the locking groove.

[0009] By adopting the above solution, the difficulty of insertion and alignment is reduced by the use of the slide, making the operation simpler and more efficient. It also ensures that the card protrusion enters the card slot accurately, achieving a stable and reliable snap-fit ​​connection. This effectively avoids loosening or failure of the connection due to insertion deviation, thereby improving assembly quality and product stability.

[0010] Furthermore, a second abutting plane is provided on the side of the slot near the slide groove, and a first abutting plane is provided on the protrusion corresponding to the second abutting plane. When the protrusion engages with the slot, the first abutting plane abuts against the second abutting plane to restrict the connector from being pulled out of the through hole.

[0011] By adopting the above solution, the strong resistance formed by the close contact between the planes can effectively limit the plug from being pulled out of the through hole, greatly enhancing the stability and reliability of the connection, preventing the plug from loosening and falling off due to external pulling during use, and ensuring the stability of the overall structure of the anti-loosening transformer housing.

[0012] Furthermore, the first mating part is a latching protrusion, the second mating part is a latching groove, the sliding groove is disposed on the plug-in, the sliding groove includes a first segment and a second segment, the first segment is closer to the latching groove than the second segment, the groove depth of the first segment is less than the groove depth of the second segment, the groove depth of the second segment is greater than or equal to the protrusion length of the latching protrusion, and the groove depth of the latching groove is greater than or equal to the protrusion length of the latching protrusion.

[0013] By adopting the above scheme, the protruding part first enters the deeper second-section groove during insertion, which can smoothly guide the insertion and reduce jamming. As it goes deeper, it enters the shallower first-section groove, which provides a buffer transition for the protruding part to enter the slot. Finally, the protruding part accurately locks into the slot, which not only ensures the smoothness of insertion and reduces the difficulty of operation, but also ensures the stability of the connection and prevents the connector from loosening and falling off.

[0014] Furthermore, the bottom of the first segment is set as an inclined surface or a curved surface, and the inclined surface or curved surface is tilted in the direction away from the slot, so that when the card protrusion slides along the first segment toward the slot, the plug has a pre-tightening force that displaces toward the first receiving groove, thereby gradually pressing the conductive component in the limiting space.

[0015] By adopting the above scheme, the conductive components can be gradually compressed during insertion, ensuring the tightness of the initial installation. Moreover, even if the components loosen due to factors such as vibration and temperature changes during subsequent use, the pre-tightening force can continue to play a role, automatically compensating for gaps and always keeping the conductive components firmly locked within the limiting space, effectively improving the stability and reliability of the transformer's operation.

[0016] Furthermore, the connector includes a first end and a second end that are inserted into the through hole sequentially. The end of the second end is also provided with a limiting cap. The cross-sectional area of ​​the limiting cap is larger than the cross-sectional area of ​​the connector. When the connector is inserted into the through hole and the first mating part engages with the second mating part, the limiting cap abuts against the outer shell body on the side of the through hole to limit the further insertion of the connector.

[0017] By adopting the above solution, the insertion depth of the connector can be precisely limited, avoiding over-insertion that could damage the internal structure or cause loose connections.

[0018] Furthermore, the first receiving groove has fitting curved surfaces at both ends that cooperate with the conductive element, and the second receiving groove penetrates the limiting cap and extends out from the side wall of the limiting cap to form a second fitting curved surface.

[0019] By adopting the above scheme, the contact area with the conductive component can be increased, making the clamping tighter and more stable, effectively dispersing stress, reducing the risk of local wear, and improving the reliability of the conductive component fixation. The first receiving groove penetrates the limiting cap and extends out of the side wall, so that the limiting cap can also play a role in pressing and limiting the conductive component during the pressing and locking process, further improving the stability of the conductive component.

[0020] Furthermore, the length of the connector is the same as the length of the through hole.

[0021] By adopting the above solution, it can be ensured that the connector completely fills the through hole space, so that the two fit tightly and avoid gaps due to length mismatch.

[0022] A current transformer includes a current inductor coil, a conductive element, and an anti-loosening transformer housing, wherein the current inductor coil is coaxially assembled within the housing.

[0023] By adopting the above scheme, the mutual inductance coil and the housing maintain a precise relative position, which can effectively reduce electromagnetic interference caused by installation deviation, improve the accuracy of current measurement, and the anti-loosening design of the housing provides stable support and protection for the mutual inductance coil, prevents the coil from loosening and shifting, extends the service life of the current transformer, and reduces maintenance costs.

[0024] Furthermore, the conductive component is a primary conductive copper component of a current transformer, with both ends extending from the through holes in the outer casing for connection to an external circuit.

[0025] By adopting the above scheme, the current transformer can be easily connected to the external electrical system to achieve accurate current transmission and measurement. The through hole provides a stable installation and support structure for the conductive copper parts, ensuring their accurate and stable position, reducing displacement caused by vibration or external force, and ensuring the reliability of current transmission.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The first mating part on the inner wall of the through hole of the outer shell cooperates with the second mating part on the connector, such as by snap-fit ​​or interference fit, to achieve precise positioning and fixation of the connector and the outer shell body. This mechanical connection method avoids the repeatability errors that may be caused by traditional tooling positioning, ensures the consistency of product accuracy, and enables the current transformer to better meet customers' strict dimensional requirements; 2. It abandons the traditional method of positioning with special tooling and fixing with glue, reducing multiple processes such as tooling production, glue application, and appearance repair after glue solidification, simplifying the production process, reducing upfront costs and preparation work, and significantly reducing labor and time costs. 3. The mechanical structure for securing conductive components is unaffected by adhesive aging or the difference in thermal expansion coefficients between the copper components and the transformer housing. During operation, even with temperature variations, it avoids the adhesive layer cracking issues common with adhesives, ensuring stable fixation of conductive components under different temperature conditions. This improves the long-term reliability of the transformer. The rigid mechanical locking method provides robust support for the conductive components, effectively preventing loosening when the transformer is subjected to external impacts or vibrations, ensuring stable transformer performance, and reducing measurement errors or malfunctions caused by loose conductive components. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a three-dimensional structural diagram of a current transformer according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the exploded structure of a current transformer according to an embodiment of the present invention; Figure 3 This is a schematic cross-sectional view of the current transformer according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the connector structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the disassembled structure of the connector and the outer shell body according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the outer shell structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the lower side structure of the through hole in an embodiment of the present invention; Figure 8 This is a schematic diagram of the upper structure of the through hole in an embodiment of the present invention.

[0029] Explanation of key figure labels: 100. Outer shell body; 110. Through hole; 120. First receiving groove; 121. First mating surface; 130. First mating part; 131. Curved surface; 132. First abutting plane; 200. Insertion piece; 201. First end; 202. Second end; 210. Second mating part; 212. Second abutting plane; 220. Second receiving groove; 221. Second mating surface; 230. Limiting space; 240. Slide groove; 241. First section; 242. Second section; 250. Limiting cap; 251. Inner surface; 300. Conductive component; 400. Mutual inductance coil. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0032] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0033] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0034] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0035] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0036] Please refer to Figures 1 to 5 This embodiment provides an anti-loosening transformer housing. This housing aims to solve the problems of low production efficiency, poor reliability, and difficult maintenance caused by the prior art's method of fixing conductive components, such as primary copper parts, with adhesive. This application achieves glue-free, rigid, and reversible locking of conductive components through a set of independent plug-in components and a mechanical engagement structure on the housing body.

[0037] like Figure 2 As shown, an anti-loosening transformer housing mainly includes a housing body 100 and an independent connector 200. The housing body 100 is typically injection molded from a plastic material with good insulation properties and mechanical strength. A through hole 110 is formed on the housing body 100 along a first direction. This through hole 110 is used to accommodate a conductive component 300, such as a primary copper component, and the subsequently inserted connector 200. The cross-sectional shape of the through hole 110 can be rectangular, circular, or other regular shapes; this embodiment uses a circular shape as an example.

[0038] like Figure 5 As shown, on one side of the inner wall of the through hole 110 (e.g., Figure 5 On the lower sidewall, a first recessed receiving groove 120 is provided. The shape of the first receiving groove 120 matches the shape of the portion of the conductive element 300 to be clamped, and is typically a straight groove extending along a first direction. On the other side inner wall opposite to the first receiving groove 120 (e.g., Figure 5 On the upper sidewall, a first mating part 130 is provided. In this embodiment, the first mating part 130 is preferably an outwardly protruding latching protrusion.

[0039] The connector 200 is also injection molded from insulating plastic, and its outer contour matches the inner contour of the through hole 110, allowing the connector 200 to be smoothly inserted into the through hole 110 in the first direction. The connector 200 has two main functional sides: The first one is the side facing the first mating part 130 ( Figure 4 A second mating part 210 is provided on the upper side (the side opposite to the protrusion). Since the first mating part 130 is a protrusion, the second mating part 210 is preferably a groove that matches the shape of the protrusion.

[0040] The second is the side facing the first receiving slot 120 ( Figure 5 A second receiving groove 220 is provided on the lower side of the connector 200 (the side opposite to the groove). When the connector 200 is fully inserted into the through hole 110, the second receiving groove 220 and the first receiving groove 120 are opposite to each other and together form a complete and closed limiting space 230.

[0041] The anti-loosening function of this housing is achieved through the following steps: First, the conductive element 300, such as a columnar copper busbar, is slid into and accommodated in the first receiving groove 120 of the housing body 100. At this point, the conductive element 300 is initially positioned but not yet locked. The connector 200 is aligned with the through hole 110, with its second receiving groove 220 facing the other unclamped edge of the conductive element 300, and the second mating part 210 (slot) facing the first mating part 130 (protrusion). Then, the connector 200 is pushed into the through hole 110 along the first direction. To allow the protrusion to smoothly enter the slot, the present invention provides a sliding groove 240. In this embodiment, the sliding groove 240 is provided on the connector 200, located at the front end of the second mating part 210 (slot) along the insertion direction (i.e., closer to the insertion start end). Figure 2 , Figure 3 As shown, the slide groove 240 is a groove with a certain length and depth. When the connector 200 begins to be inserted, the locking protrusion on the housing first enters the slide groove 240. The slide groove 240 serves to guide and accommodate the locking protrusion, ensuring that the connector 200 moves along the correct path and avoiding deflection.

[0042] As the connector 200 continues to penetrate deeper, the locking protrusion slides relative to the slide groove 240 until it reaches the end of the slide groove 240 and aligns with the second mating part 210 (i.e., the locking groove). At this point, a guide slope is further provided between the first mating part 130 (locking protrusion) and the second mating part 210 (locking groove), allowing the locking protrusion to undergo slight elastic deformation under external force or be guided accordingly, ultimately snapping into the locking groove with a click. After snapping in, the locking protrusion and the locking groove form a stable engaging connection; in some designs, this can also be an interference fit. Simultaneously, the second receiving groove 220 of the connector 200 is also tightly pressed against the other edge of the conductive element 300. Thus, the conductive element 300 is firmly clamped from both the top and bottom by the first receiving groove 120 and the second receiving groove 220, achieving mechanical rigid locking. Disassembly can be performed by pushing the connector 200 out with reverse force.

[0043] Besides the snap-fit ​​type, the first mating part 130 and the second mating part 210 can also be designed as simple bevels or arcs, achieving an interference fit through precise dimensional tolerance control. That is, in the final stage of insertion, the connector 200 relies on its own or the shell's slight elastic deformation to tightly squeeze the two mating parts together, fixing them by friction. This solution also achieves glue-free fixing, has a simpler structure, and is suitable for scenarios where the locking force requirement is not extreme.

[0044] In this embodiment, the groove 240 is crucial for ensuring smooth and precise assembly. Without the groove 240, the latching protrusion would directly and rigidly contact the wall of the connector 200, leading to difficulty or even inability to insert, or requiring excessive force to push the latching protrusion through, which could damage the component. The groove 240 provides a dedicated track for the latching protrusion, significantly reducing insertion resistance and ensuring the accuracy of the final engagement. Furthermore, a curved surface 131 (e.g., ...) can be provided on the side of the latching protrusion facing the connector 200 for insertion. Figure 8 This reduces friction and improves sliding smoothness, which has the beneficial effects of improving assembly efficiency, reducing operational difficulty, and protecting the integrity of parts.

[0045] It should be noted that, apart from the scheme where the protrusion is on the outer shell and the slot is on the connector, the opposite arrangement can be used, i.e., the first mating part 130 is the slot and the second mating part 210 is the protrusion. In this case, the setting position and engagement principle of the slide groove 240 only need to be adjusted adaptively. For example, the slide groove 240 can be set on the inner wall of the through hole 110 of the outer shell body 100 to guide the protrusion on the connector 200. The technical problem solved and the technical effect achieved are substantially the same, and both fall within the protection scope of this invention.

[0046] like Figure 3 As shown, in some embodiments, to prevent the connector 200 from being dislodged from the through hole 110 due to vibration or accidental pulling during subsequent use, an anti-pull-out plane is provided at the connection between the slot and the slide. Specifically, a second abutment plane 212 is provided on the side of the slot (i.e., the second mating part 210) near the slide 240. Correspondingly, a first abutment plane 132 is provided at the corresponding position of the protrusion (i.e., the first mating part 130). When the protrusion is fully engaged in the slot, the first abutment plane 132 and the second abutment plane 212 abut tightly. These two planes are almost perpendicular to the pull-out direction of the connector 200, thereby generating a huge reverse resistance, so that the connector 200 cannot be directly pulled out unless it is damaged. This design provides extremely high connection reliability and vibration resistance. However, it is suitable for scenarios where it is not necessary to disassemble the connector 200.

[0047] Alternative Solution: As a replacement for the aforementioned one-time anti-pull-out structure, for scenarios requiring detachable maintenance, the latch (first mating part 130) can be designed as a movable structure. For example, it can be mounted on a spring-driven slider, with a push button located on the outside of the housing body 100. When the button is pressed, the latch 130 retracts against the spring force, disengaging from the latch 210, thereby allowing the connector 200 to be pulled out without damage. This alternative solution provides maintainability.

[0048] To further improve the stability and pre-tightening effect of locking, such as Figure 3 , Figure 4 As shown, the slide groove 240 has been optimized in this embodiment. The slide groove 240 is divided into a first segment 241 and a second segment 242. The second segment 242 is closer to the insertion start end of the connector 200, while the first segment 241 is closer to the slot (second mating part 210).

[0049] The groove depth of the first segment 241 is less than the groove depth of the second segment 242. Furthermore, the groove depth of the second segment 242 is greater than or equal to the protrusion length of the latching protrusion (first mating part 130), and the groove depth of the latching groove (second mating part 210) is also greater than or equal to the protrusion length of the latching protrusion.

[0050] The working principle is as follows: Initially, the locking protrusion enters the deeper second section 242. Due to ample space, the connector 200 can be inserted freely and smoothly without interference. When the locking protrusion moves to the first section 241, the groove depth suddenly becomes shallower, forming a slope or step. This causes the locking protrusion to begin pressing against the groove wall of the connector 200. Since the locking protrusion is fixed, this pressing forces the connector 200 to make a slight displacement towards the first receiving groove 120 (i.e., the direction of clamping the conductive element). This displacement causes the second receiving groove 220 to press more tightly against the conductive element 300, thus establishing a pre-tightening force before final engagement.

[0051] In a more preferred embodiment, the bottom of the groove in the first segment 241 is set as a slope or a smooth curved surface, and the slope or curved surface is inclined towards the side away from the slot (i.e., the closer to the slot, the shallower the groove). As the latch slides along this slope, the pressure applied to the connector 200 gradually increases, thereby gradually increasing the clamping force of the connector 200 on the conductive component 300. This progressive preload loading method not only avoids damage to the parts caused by sudden stress, but more importantly, it ensures that even if the gap in the limiting space 230 slightly increases due to thermal expansion and contraction or long-term creep during product operation, this preload can continue to function, pushing the connector 200 to automatically compensate for the gap and always firmly lock the conductive component 300. This significantly improves the long-term reliability and anti-loosening ability of the product.

[0052] like Figure 4 and Figure 5 As shown, the connector 200 also includes a limiting cap 250. The connector 200 is inserted in a sequential order: the end inserted first into the through hole 110 is the first end 201, and the end inserted later is the second end 202. The limiting cap 250 is located at the end of the second end 202. The cross-sectional area of ​​the limiting cap 250 is significantly larger than the cross-sectional area of ​​the main body of the connector 200.

[0053] The function of the limiting cap 250 is to provide a clear insertion depth stop. When the connector 200 is inserted to the correct position where the first mating part 130 and the second mating part 210 are precisely engaged, the inner surface 251 of the limiting cap 250 abuts against the outer wall surface surrounding the insertion port of the through hole 110 on the housing body 100. This provides the operator with a clear tactile feedback and indication of the correct insertion, preventing damage to the engagement structure or conductive parts 300 due to over-insertion, and also preventing inadequate engagement due to insufficient insertion.

[0054] In a further optimized embodiment, the second receiving groove 220 is not limited to the main body of the connector 200, but starts from the first end 201, runs through the entire connector 200, and finally exits from the side wall of the limiting cap 250, forming the second fitting surface 221 (e.g., Figure 5 (As shown). Simultaneously, both ends of the first receiving groove 120 are provided with first conforming curved surfaces 121 that match the edge shape of the conductive element 300 (as shown). Figure 7 As shown in the figure, in order to increase the contact area and reduce the contact stress, this through-type design has a dual beneficial effect: firstly, it makes the limiting cap 250 itself also part of the pressing conductive element 300, providing additional limiting and clamping force; secondly, this open slot design allows air to be discharged during the pressing and locking process, and allows the end of the conductive element 300 to pass through the side wall of the limiting cap 250, which is especially important for conductive elements 300 that are long or require external connection.

[0055] In a typical embodiment, the length of the main body of the connector 200 (excluding the limiting cap 250) is designed to be substantially consistent with the depth of the through hole 110. The purpose is that, once the connector 200 is installed, its main body can completely and densely fill the entire through hole 110, providing maximum and most uniform support for the clamped conductive component 300. This avoids leaving unfilled gaps in the through hole 110 due to insufficient body length, thereby eliminating the risk of bending or vibration that may occur in these gaps.

[0056] Please refer to Figure 1-2This embodiment provides a current transformer, which includes a ring-shaped or square current transformer coil 400, a conductive element 300 serving as a primary conductor, and the housing described in Embodiment 1 above. The current transformer coil 400 is coaxially mounted inside the housing body 100. Coaxial mounting here means that the central axis of the current transformer coil 400 is substantially coincident with the central axis of the through hole 110 on the housing body 100, to ensure magnetic field coupling efficiency. The conductive element 300 is a primary conductive copper busbar or copper rod passing through the center of the current transformer coil 400.

[0057] The conductive element 300, as a primary conductive copper component, extends from the through holes 110 of the housing body 100 at both ends for electrical connection with the external main circuit. When a large current flows through the conductive element 300, a magnetic field is generated around it. This magnetic field is induced by the mutual inductance coil 400, thereby generating a small current signal proportional to the primary current at the secondary output terminal of the coil (not shown in the figure), which is used by measurement or protection devices.

[0058] Thanks to its anti-loosening housing, this current transformer offers the following significant advantages: Highly efficient assembly. No need for dispensing glue or waiting for it to cure; simply place the conductive component 300 into the slot and insert the connector 200 to complete the fixation, greatly improving production efficiency.

[0059] The performance is stable and reliable. The conductive component 300 is rigidly locked by a mechanical structure, and its position relative to the mutual inductance coil 400 is highly accurate and remains unchanged over time. This ensures the stability and consistency of the transformer's output characteristics, preventing displacement of the copper component due to temperature cycling or mechanical vibration, thereby avoiding measurement errors.

[0060] Cost reduction. Tooling, fixtures, adhesives, and related labor and management costs are eliminated. At the same time, the reduced number of processes shortens the production cycle and decreases work-in-process inventory.

[0061] Maintainability. For embodiments employing a movable latch structure, when maintenance is required, the connector 200 can be easily removed, the conductive component 300 can be taken out or replaced, and then the product can be reassembled, greatly reducing the total life-cycle cost.

[0062] Therefore, any modifications, equivalent substitutions, or improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention. The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. A housing for an anti-loosening current transformer, characterized in that, include: The outer shell body has a through hole extending through itself along a first direction, a first mating part is provided on one inner wall of the through hole, and a first receiving groove is provided on the other side; A connector is inserted into the through hole along a first direction. A second mating part is provided on the side of the connector facing the first mating part, and a second receiving groove is provided on the side of the connector facing the first receiving groove. The first receiving groove and the second receiving groove enclose a limiting space for clamping the conductive component. The connector or the inner wall is also provided with a sliding groove, which is used for the first mating part or the second mating part to slide along the sliding groove; When the connector is inserted into the through hole in the first direction, the first mating part or the second mating part slides along the groove until the first mating part and the second mating part engage or press against each other. At this time, the conductive element in the limiting space is locked and fixed.

2. The anti-loosening transformer housing according to claim 1, characterized in that, In the first mating part and the second mating part, one is an outwardly protruding locking protrusion, and the other is a locking groove adapted to engage with the locking protrusion. The sliding groove and the locking groove are spaced apart along the first direction so that when the connector is inserted, it slides sequentially from the sliding groove into the locking groove.

3. The anti-loosening transformer housing according to claim 2, characterized in that, The slot has a second abutting surface on the side near the slide groove, and the protrusion has a first abutting surface corresponding to the second abutting surface. When the protrusion engages with the slot, the first abutting surface abuts against the second abutting surface to prevent the connector from being pulled out of the through hole.

4. The anti-loosening transformer housing according to claim 2, characterized in that, The first mating part is a latching protrusion, the second mating part is a latching groove, and the sliding groove is disposed on the plug-in. The sliding groove includes a first section and a second section. The first section is closer to the latching groove than the second section. The groove depth of the first section is less than the groove depth of the second section. The groove depth of the second section is greater than or equal to the protrusion length of the latching protrusion. The groove depth of the latching groove is greater than or equal to the protrusion length of the latching protrusion.

5. The anti-loosening transformer housing according to claim 4, characterized in that, The bottom of the first segment is set as an inclined surface or a curved surface, and the inclined surface or curved surface is tilted towards the side away from the slot, so that when the card protrusion slides along the first segment toward the slot, the plug has a pre-tightening force that displaces toward the first receiving groove, thereby gradually pressing the conductive component in the limiting space.

6. The anti-loosening transformer housing according to claim 1, characterized in that, The connector includes a first end and a second end that are inserted into the through hole sequentially. The end of the second end is also provided with a limiting cap. The cross-sectional area of ​​the limiting cap is larger than the cross-sectional area of ​​the connector. When the connector is inserted into the through hole and the first mating part engages with the second mating part, the limiting cap abuts against the outer shell body on the side of the through hole to limit the further insertion of the connector.

7. The anti-loosening transformer housing according to claim 6, characterized in that, The first receiving groove has a first fitting curved surface at both ends that mates with the conductive element, and the second receiving groove passes through the limiting cap and extends out from the side wall of the limiting cap to form a second fitting curved surface.

8. The anti-loosening transformer housing according to claim 6, characterized in that, The length of the connector is the same as the length of the through hole.

9. A current transformer, characterized in that, It includes a mutual inductor coil, a conductive element, and a non-loosening transformer housing as described in any one of claims 1-8, wherein the mutual inductor coil is coaxially assembled within the housing body.

10. A current transformer according to claim 9, characterized in that, The conductive component is a primary conductive copper component of a current transformer, with both ends extending from the through holes in the outer casing for connection to an external circuit.

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