A terminal block

Abstract

This utility model discloses a terminal block, including a insert and a spring. The insert has a three-dimensional contact structure, and the spring has a sleeve structure. The three-dimensional contact structure is inserted into the sleeve structure, such that at least two opposing outer surfaces of the three-dimensional contact structure maintain surface contact with the inner wall of the sleeve structure, thereby forming at least two opposing conductive contact surfaces. The geometric interlocking design of the three-dimensional contact structure and the sleeve structure eliminates reliance on elastic clamping, avoiding clamping force attenuation due to material fatigue. The design of multiple independent contact surfaces ensures that even if one contact surface undergoes microscopic changes, other contact surfaces can still maintain effective connection, reducing the risk of complete disconnection. Parallel conductive paths and increased contact area reduce overall contact resistance, avoiding localized current concentration. Furthermore, stable low-resistance connection and uniform current distribution effectively control temperature rise, eliminating the potential safety hazard caused by overheating.

Description

Technical Field

[0001] This utility model belongs to the field of electrical connection technology, and specifically relates to a terminal block. Background Technology

[0002] In the field of electrical connections, terminal blocks, as a basic and critical connecting element, are widely used in various electronic devices, power systems and household appliances. Their core function is to achieve reliable electrical connection and mechanical fixation between wires.

[0003] Currently, common terminal block types on the market include PCB board terminals, metal terminals, nut terminals, and spring terminals. Among them, the clamping structure terminal with a insert and spring is widely used due to its simple structure and convenient assembly. This type of terminal typically has the insert soldered to the PCB board, while the spring clamps the insert through a groove it forms to achieve electrical connection. However, this structure has significant drawbacks: the insert and spring only contact each other on one side, resulting in a limited contact area and a relatively high initial contact resistance. Under repeated insertion and removal operations or thermal expansion and contraction caused by prolonged power-on, the clamping structure of the spring is prone to plastic deformation or fatigue relaxation, leading to a decrease in clamping force. This further causes poor contact, increased contact resistance, and excessively high local temperature rise, and in severe cases, even fire hazards. Utility Model Content

[0004] In view of this, the present invention provides a terminal block that can improve contact reliability, reduce contact resistance, and prevent loosening of the connection due to plugging / unplugging or temperature rise.

[0005] To address the aforementioned problems, according to one aspect of this application, an embodiment of the present invention provides a terminal block comprising a insert and a spring. The insert has a three-dimensional contact structure, and the spring is provided with a fitting structure adapted to the three-dimensional contact structure. The three-dimensional contact structure is inserted into the fitting structure such that at least two opposing outer surfaces of the three-dimensional contact structure maintain surface contact with the inner wall surface of the fitting structure, thereby forming at least two opposing conductive contact surfaces.

[0006] In some embodiments, the fitting structure is an elastic groove formed on the spring body, the shape of the elastic groove matching the contour of the three-dimensional contact structure of the insert, so that the elasticity of the elastic groove provides a clamping force to the three-dimensional contact structure after insertion.

[0007] In some embodiments, the three-dimensional contact structure is a sheet-like structure with periodic undulations extending along the insertion / removal direction, the periodic undulations being configured to increase the contact area between the insert and the assembly structure.

[0008] In some embodiments, the periodic undulating structure is a continuous and smooth waveform structure with a wavy cross-section.

[0009] In some embodiments, the periodic undulating structure is a polygonal structure composed of multiple straight line segments connected end to end.

[0010] In some embodiments, the periodic undulating structure includes a series of triangular, rectangular, or trapezoidal protrusions to form an outline with polygonal edges.

[0011] In some embodiments, the tail end of the spring is provided with a first crimping portion and a second crimping portion in sequence along the wire insertion direction. The first crimping portion is used to crimp and fix the conductor of the wire, and the second crimping portion is used to crimp and fix the insulation layer of the wire.

[0012] In some embodiments, the first crimping portion and the second crimping portion are formed by bending and stamping the metal sheet at the tail end of the spring.

[0013] In some embodiments, the insert has a welded portion extending from the other end of the three-dimensional contact structure.

[0014] In some embodiments, the welded portion includes two parallel sheet-like weld legs, which are located on the same plane and spaced apart by a predetermined distance.

[0015] Compared with the prior art, the terminal block of this utility model has at least the following beneficial effects: The terminal block provided by this utility model includes a insert and a spring. The insert has a three-dimensional contact structure, and the spring is provided with a fitting structure adapted to the three-dimensional contact structure. The three-dimensional contact structure is inserted into the fitting structure, so that at least two opposite outer surfaces of the three-dimensional contact structure are in surface contact with the inner wall surface of the fitting structure, thereby forming at least two opposite conductive contact surfaces.

[0016] To address the deformation of the retaining spring caused by repeated insertion and removal in traditional technologies, the geometric interlocking design of the three-dimensional contact structure and the sleeve structure in this embodiment eliminates the reliance on elastic clamping, fundamentally avoiding clamping force attenuation due to material fatigue. Regarding poor contact, the design of multiple independent contact surfaces ensures that even if one contact surface undergoes microscopic changes, other contact surfaces can maintain effective connection, greatly reducing the risk of complete disconnection. For the issue of increased contact resistance, parallel conductive paths and increased contact area significantly reduce overall contact resistance, preventing localized current concentration. Regarding the problem of excessive heat generation, stable low-resistance connection and uniform current distribution effectively control temperature rise, eliminating the potential safety hazard caused by overheating.

[0017] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is an exploded view of a wiring terminal provided in an embodiment of this utility model; Figure 2 This is a schematic diagram of the structure of a plug in a terminal block provided by an embodiment of this utility model; Figure 3 This is a schematic diagram of the structure of a middle insert spring for a wiring terminal provided in an embodiment of this utility model; Figure 4 This is a top view of a wiring terminal provided in an embodiment of this utility model; Figure 5 This is a cross-sectional view of a connector insert provided in an embodiment of this utility model; Figure 6 This is a top view of a spring insert in a terminal block provided by an embodiment of this utility model; Figure 7 This is a cross-sectional view of a terminal block provided in an embodiment of the present invention, where the periodic undulating structure is a continuous and smooth waveform structure. Figure 8 This is a cross-sectional view of a terminal block provided in an embodiment of the present invention, when the periodically undulating structure is a polygonal structure. Figure 9 This is a cross-sectional view of a terminal block provided in an embodiment of the present invention, where the periodically undulating structure consists of continuously arranged triangular protrusions. Figure 10 This is a cross-sectional view of a terminal block provided in an embodiment of the present invention, where the periodically undulating structure consists of continuously arranged rectangular protrusions.

[0020] in: 1. Insert; 11. Three-dimensional contact structure; 12. Welding part; 2. Insert spring; 21. Set structure; 22. First crimping part; 23. Second crimping part. Detailed Implementation

[0021] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this utility model application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0022] In the description of this utility model, it should be clarified that the terms "first," "second," etc., in the specification, claims, and drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; the terms "vertical," "lateral," "longitudinal," "front," "back," "left," "right," "up," "down," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this utility model.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] This embodiment provides a wiring terminal, such as Figures 1-10 As shown, the terminal block includes a insert 1 and a spring 2. The insert 1 has a three-dimensional contact structure 11, and the spring 2 has a fitting structure 21 adapted to the three-dimensional contact structure 11. The three-dimensional contact structure 11 is inserted into the fitting structure 21, such that at least two opposite outer surfaces of the three-dimensional contact structure 11 are in surface contact with the inner wall surface of the fitting structure 21, thereby forming at least two opposite conductive contact surfaces.

[0025] In this embodiment, the insert 1 serves as the fixed part of the connector. Its three-dimensional contact structure 11 interlocks with the spring 2 through a specific three-dimensional geometry, thereby significantly improving connection reliability and current conduction capability. The spring 2, as a separable connecting component, has a sleeve structure 21 that fits tightly with the three-dimensional contact structure 11 through an enclosing internal cavity, providing both physical support and establishing a stable electrical path. The core function of the three-dimensional contact structure 11 is to create multiple independent contact interfaces within a limited space through its non-planar surface morphology, effectively increasing the effective contact area and dispersing insertion and extraction stress. The sleeve structure 21, through its geometrically complementary enclosing design with the three-dimensional contact structure 11, simultaneously forms constraints in the radial and axial directions, preventing relative displacement caused by vibration or thermal deformation.

[0026] More specifically, the three-dimensional contact structure 11 of the insert 1 is integrally formed with its main body, and its three-dimensional configuration creates multiple contact areas in different directions on its outer surface. The sleeve structure 21 serves as the end connection mechanism of the insert spring 2, and the contour of its internal cavity closely matches the external shape of the three-dimensional contact structure 11, forming a mortise and tenon-like fit. When the two are combined, the three-dimensional contact structure 11 is completely contained within the internal space of the sleeve structure 21, and its multiple outer surfaces maintain continuous surface contact with the inner wall of the sleeve structure 21. This fit achieves self-positioning in the insertion and extraction direction through shape matching, and forms natural constraints in the radial direction through multi-surface contact.

[0027] During operation, when the three-dimensional contact structure 11 is inserted axially into the sleeve structure 21, its unique geometry guides the two to achieve natural alignment, and multiple contact surfaces simultaneously establish physical contact. Current is diverted from the insert 1 body to various contact areas of the three-dimensional contact structure 11, then transmitted in parallel to the inner wall of the sleeve structure 21, and finally output through the conductor of the spring 2. Because the current path changes from a traditional single path to multiple parallel paths, the effective conductive cross-sectional area increases significantly. Simultaneously, because the mechanical connection does not rely on the residual stress of the elastic element, but rather achieves a stable connection through geometric interlocking, it can maintain its initial contact state even after long-term use.

[0028] To address the deformation of the spring caused by repeated insertion and removal in traditional technologies, the geometric interlocking design of the three-dimensional contact structure 11 and the sleeve structure 21 in this embodiment eliminates the reliance on elastic clamping, fundamentally avoiding clamping force attenuation due to material fatigue. Regarding poor contact, the design of multiple independent contact surfaces ensures that even if one contact surface undergoes microscopic changes, other contact surfaces can maintain effective connection, greatly reducing the risk of complete disconnection. For the problem of increased contact resistance, parallel conductive paths and increased contact area significantly reduce overall contact resistance, preventing localized current concentration. Regarding the problem of excessive heat generation, stable low-resistance connection and uniform current distribution effectively control temperature rise, eliminating the potential safety hazard caused by overheating.

[0029] In a specific embodiment, the fitting structure 21 is an elastic groove formed on the main body of the insert spring 2. The shape of the groove cavity matches the contour of the three-dimensional contact structure 11 of the insert 1, so that the elasticity of the elastic groove provides a clamping force to the three-dimensional contact structure 11 after insertion.

[0030] The assembly structure 21 described in this embodiment is an elastic groove-shaped structure formed on the main body of the insert spring 2. The internal cavity shape of the elastic groove is specially designed to match the external contour of the three-dimensional contact structure 11 of the insert 1. The core effect of this feature is that after the insert 1 and the insert spring 2 complete the insertion action, the elastic groove can continuously apply an inward and uniform clamping force to each contact surface of the three-dimensional contact structure 11 by relying on the elastic deformation capability of its own material. This clamping force does not come from external parts, but is the rebound force generated by the elastic groove itself attempting to return to its original shape after slight elastic deformation caused by being stretched by the three-dimensional contact structure 11 during the insertion process.

[0031] More specifically, this embodiment cleverly combines the interlocking advantages of shape matching with the pressure advantages of elastic contact. During insertion, the three-dimensional contact structure 11 guides the elastic groove to undergo controllable elastic expansion, ensuring smooth insertion. After insertion, the rebound force of the elastic groove causes its inner wall to tightly "hold" the three-dimensional contact structure 11, not only mechanically eliminating any potential micro-gaps and making the connection tighter and more secure, significantly improving vibration and loosening resistance, but also electrically optimizing contact performance. This continuous pressure ensures that the contact surfaces are always in a tight fit, effectively breaking down micro-oxide layers or contaminants on the contact surfaces, thereby establishing a larger and less contaminated metal contact area, further reducing and stabilizing contact resistance. Furthermore, this elastic compensation mechanism greatly improves the product's reliability in complex operating conditions. Even after long-term use, due to repeated insertion and removal or thermal expansion and contraction causing minor wear or deformation of the metal material, the elastic groove can still automatically compensate for these minor dimensional changes through its own elastic deformation, and continue to maintain sufficient clamping force. This prevents the increase in contact resistance and overheating caused by pressure decay, significantly extending the service life of the terminal and maintaining its performance stability.

[0032] In a specific embodiment, the three-dimensional contact structure 11 is a sheet-like structure with periodic undulations extending along the insertion and removal direction, and the periodic undulations are configured to increase the contact area between the insert 1 and the assembly structure 21.

[0033] The three-dimensional contact structure 11 is a sheet-like structure whose main body extends along the insertion and extraction directions. However, this sheet-like structure is not flat but is processed into a structure with a repeating, regular wave pattern. This periodic undulation creates continuous peaks and troughs on the surface of the originally flat sheet-like structure in three-dimensional space. In other words, by creating a three-dimensional surface much larger than its projected area in the insertion and extraction directions, the effective contact area for conducting electricity is greatly increased. When this three-dimensional contact structure 11 is inserted into the matching sleeve structure 21, the curved surfaces of each peak and trough can fit against the inner wall of the sleeve structure 21, thereby forming a large-area close contact.

[0034] More specifically, this periodic undulating design transforms simple linear or single-sided contact into an extended, multi-dimensional contact interface. Compared to a completely flat insert, the three-dimensional curved surface increases the actual usable metal surface area for conduction several times over, while maintaining the same insertion / removal stroke and occupying roughly the same amount of space. Current can be transmitted in parallel through multiple contact points formed by each crest and trough, significantly reducing local current density. Furthermore, this undulating structure not only increases the static contact area but also optimizes the mechanical properties during insertion and removal. It provides excellent guidance during insertion, helping the insert 1 slide smoothly into the housing structure 21. Simultaneously, the periodic undulating structure itself possesses a certain degree of elastic deformation capability, better adapting to minor alignment deviations or dimensional tolerances, ensuring uniform distribution of contact force and avoiding stress concentration. Ultimately, this fundamental change in geometry leads to a comprehensive performance improvement: the significantly increased contact area directly results in a significant reduction in contact resistance and enhanced heat dissipation, while the stable mechanical connection effectively suppresses contact deterioration caused by micro-motion, vibration, or thermal cycling, thereby achieving lower power consumption, less heat generation, and higher long-term connection reliability overall.

[0035] In a specific embodiment, such as Figure 7 As shown, the periodic undulating structure is a continuous and smooth waveform structure with a wavy cross-section.

[0036] This embodiment defines the periodic undulation structure as a continuous and smooth waveform structure. This structure greatly optimizes the mechanical performance of the mating process and the reliability of long-term use. The smooth waveform profile provides an extremely smooth guiding effect when the three-dimensional contact structure 11 is inserted into the sleeve structure 21, significantly reducing the force required for the insertion operation and effectively avoiding scratches or wear on the inner wall of the sleeve structure 21 or the generation of metal shavings that may be caused by sharp edges, thereby protecting the smoothness of the contact surface.

[0037] In a specific embodiment, such as Figure 8As shown, the periodic undulating structure is a broken line structure composed of multiple straight line segments connected end to end.

[0038] In this embodiment, the three-dimensional contact structure 11 is defined as a series of continuous straight line segments. These straight line segments are connected end to end and form obvious angles at the connection points, thus jointly outlining a zigzag or stepped profile. This zigzag structure means that its surface is not a smooth curve, but is composed of multiple flat micro-planes and alternating angles or perpendicular angles between them, presenting an undulating shape with clear geometric edges when viewed in cross-section.

[0039] The angled lines formed by the straight segments create a more effective mechanical interlock when combined with the assembly structure 21, significantly improving vibration resistance and resistance to loosening. Although the insertion process may require a slightly larger initial force, the angled structure provides a more robust connection after insertion. Furthermore, this geometry, composed of straight lines and angles, is easier to machine with high precision using conventional stamping processes, ensuring product consistency and reducing production costs. The polygonal structure also expands the effective contact area by increasing multiple independent contact planes, providing a good foundation for reducing contact resistance and improving electrical performance. This design, while maintaining electrical connection reliability, focuses more on improving the durability of the mechanical connection and ease of manufacturing.

[0040] In a specific embodiment, such as Figure 9 and Figure 10 As shown, the periodic undulating structure includes a series of triangular, rectangular, or trapezoidal protrusions to form a contour with polygonal edges.

[0041] In this embodiment, the three-dimensional contact structure 11 has a periodic undulation composed of a series of continuously arranged protrusions of specific geometric shapes. These protrusions can be triangles, rectangles, or trapezoids. By repeatedly arranging these basic geometric units, they collectively form an overall contour with clear polygonal edges. This design means that the surface of the three-dimensional contact structure 11 is composed of multiple regular polygonal planes and edges that alternately combine. For example, continuous triangular protrusions will form jagged edges, continuous rectangular protrusions may form a stepped contour, and trapezoidal protrusions can be combined to form a more directional transition shape. More specifically, these regularly arranged geometric protrusions provide numerous well-defined and stable contact platforms for the inner wall of the assembly structure 21. Each polygonal plane is an independent conductive contact area, and the parallel connection of numerous small contact surfaces significantly increases the total effective contact area, which helps to evenly distribute current and reduce contact resistance. Simultaneously, the sharp edges of these polygons form an effective mechanical interlock when engaged with the elastic groove, enhancing the connection points' resistance to axial tension and radial torsion, and improving vibration resistance and loosening resistance. Furthermore, basic geometric shapes such as triangles, rectangles, or trapezoids are well-suited for mass production using high-precision stamping processes, ensuring not only the consistency of each protrusion's shape, thus guaranteeing stable contact performance, but also facilitating cost control and improved production efficiency. Therefore, this polygonal protrusion design improves conductivity electrically through parallel connection of multiple contact points, enhances connection reliability mechanically through geometric interlocking, and balances precision and cost-effectiveness in manufacturing.

[0042] In a specific embodiment, such as Figure 1 and Figure 3 As shown, the tail end of the spring 2 is provided with a first crimping part 22 and a second crimping part 23 in sequence along the wire insertion direction. The first crimping part 22 is used to crimp and fix the conductor of the wire, and the second crimping part 23 is used to crimp and fix the insulation layer of the wire.

[0043] When a wire is connected, its insulation layer first passes through the second crimping part 23, and then the exposed conductor portion enters the first crimping part 22. These two parts are usually continuous and independent in structure, together forming the connection terminal between the spring 2 and the external wire.

[0044] The primary function of the first crimping part 22 is to firmly crimp and secure the exposed metal conductor at the end of the wire, ensuring a low-resistance and stable electrical connection between it and the spring 2 body—a critical path for current transmission. The primary function of the second crimping part 23 is to crimp and secure the outer insulation layer of the wire; its core function is to provide a robust mechanical anchor point, thereby eliminating stress. When used together, the first crimping part 22 performs the conductive function, while the second crimping part 23 performs the load-bearing function. This division of labor ensures that the metal conductor portion of the wire is not subjected to mechanical stress due to external pulling, bending, or vibration. All mechanical loads are primarily borne by the robust insulation layer of the wire applied by the second crimping part 23, effectively preventing conductor breakage due to fatigue and ensuring the long-term reliability of the electrical connection.

[0045] In a specific embodiment, the first crimping portion 22 and the second crimping portion 23 are formed by bending and stamping the metal sheet at the tail end of the spring 2.

[0046] In this embodiment, the first crimping part 22 and the second crimping part 23 are integrally formed by continuously bending and stamping the same piece of metal material at the tail end of the spring 2. This means that the crimping part is not formed by welding or assembling additional parts, but is an inseparable whole with the main body of the spring 2. The effects of this manufacturing method are mainly reflected in the reliability of the connection and the economy of production. More specifically, the integrally formed structure avoids the problems of incomplete welding or uneven contact resistance that may be caused by welding, ensuring the integrity and consistency of the current transmission path from the main body of the spring 2 to the crimping part, thereby improving the stability of the electrical connection. At the same time, the bending and stamping process can optimize the grain flow direction inside the metal material with the shape, giving the crimping part higher mechanical strength and fatigue resistance, so that it can still maintain sufficient clamping force after multiple crimping operations. In addition, this processing method is very suitable for large-scale continuous production. Multiple parts can be processed in one step by forming with a mold, which not only ensures the consistency of product dimensional accuracy, but also reduces the production cost and processing time of individual parts.

[0047] like Figure 1 and Figure 2 As shown, in a specific embodiment, the insert 1 has a welding portion 12 extending from the other end of the three-dimensional contact structure 11. The welding portion 12 is configured to be welded to the pads of the printed circuit board (PCB) to fix the insert 1 to the circuit board.

[0048] The insert 1 adopts an integrated structural design, with a soldering part 12 extending directly from the opposite end of the three-dimensional contact structure 11. The soldering part 12 is specially designed to have a planar or pin shape suitable for soldering, and can be reliably connected to the pads on the printed circuit board through conventional soldering processes.

[0049] More specifically, the integrated structure ensures a continuous and complete current path from the welding point to the high-current contact area, avoiding contact resistance and potential failure points that may be introduced through additional connectors, thereby improving overall conductivity reliability. The welding connection provides stable mechanical fixation for the insert 1, enabling it to withstand certain insertion and extraction forces and vibrations, ensuring its robustness for long-term use.

[0050] In a specific embodiment, the welding part 12 includes two parallel sheet-like welding feet, which are located on the same plane and spaced apart by a predetermined distance.

[0051] The welding part 12 uses two parallel sheet-like metal feet as a connection structure. These two welding feet are on the same horizontal plane and maintain a specific distance.

[0052] More specifically, this dual-pin design forms a stable two-point support structure. The predetermined distance between the two pins is calculated to ensure that the pins accurately correspond to the pads on the circuit board while also providing sufficient space to avoid bridging short circuits during soldering. This parallel and symmetrical layout allows the solder joint 12 to remain balanced when subjected to forces in different directions. When the insert 1 is subjected to insertion / removal forces or vibrations, the two pins can share the stress, preventing stress concentration that could lead to solder joint cracking.

[0053] Furthermore, the dual-pin design increases the contact area with the solder, improving solder joint strength and current conduction capability. The two parallel current paths further reduce connection resistance. In automated production processes, this symmetrical structure facilitates robotic gripping and positioning, improving production efficiency and product consistency. Therefore, this design significantly enhances the mechanical stability and electrical reliability of the connection through a dual-point fixing method.

[0054] The working principle of the terminal block described in this embodiment is based on the collaborative operation of the unique kit-type connection structure between the insert 1 and the spring 2. Specifically, the insert 1 is firmly soldered to the circuit board through the welding part 12 at its end, where the two parallel plate-shaped solder feet of the welding part 12 provide stable mechanical fixation and electrical connection, ensuring the reference position of the insert 1. The front end of the insert 1 is designed with a three-dimensional contact structure 11, which can be a continuous smooth waveform, a polygonal shape, or a polygonal contour with triangular protrusions, etc. Its core function is to convert the traditional planar contact into a multi-surface contact in three-dimensional space. The front end of the spring 2 that cooperates with it is provided with a kit structure 21, which is usually an elastic groove, and its inner cavity shape precisely matches the contour of the three-dimensional contact structure 11. When the operator kites the spring 2 onto the insert 1, the three-dimensional contact structure 11 guides it to be smoothly inserted into the kit structure 21. The elastic groove undergoes slight elastic deformation, thereby generating a continuous clamping force, so that the multiple opposite outer surfaces of the three-dimensional contact structure 11 form a large area of ​​surface contact with the inner wall of the kit structure 21, thereby establishing multiple parallel current paths and significantly reducing contact resistance. At the tail end of the spring 2, the first crimping part 22 and the second crimping part 23 are integrally bent and stamped from metal sheets, and are used to crimp the metal conductor and the insulating sheath of the wire, respectively. The first crimping part 22 ensures a low-resistance electrical connection, while the second crimping part 23 provides mechanical stress relief to prevent the wire from breaking due to shaking. The two work together to ensure the long-term reliability of the wire connection.

[0055] The entire working process achieves stable and efficient transmission of electrical connections from the circuit board to the wires through the precise cooperation of multiple components, fundamentally solving the problems of poor contact, increased resistance and overheating caused by the small contact area and elastic decay of traditional clamp-type terminals.

[0056] In summary, it is readily understood by those skilled in the art that, without conflict, the aforementioned advantageous technical features can be freely combined and superimposed.

[0057] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A terminal block, characterized in that, The terminal block includes a insert and a spring. The insert has a three-dimensional contact structure, and the spring has a fitting structure adapted to the three-dimensional contact structure. The three-dimensional contact structure is inserted into the fitting structure, such that at least two opposite outer surfaces of the three-dimensional contact structure are in surface contact with the inner wall of the fitting structure, thereby forming at least two opposite conductive contact surfaces.

2. The terminal block according to claim 1, characterized in that, The assembly structure is an elastic groove formed on the spring body. The shape of the elastic groove matches the contour of the three-dimensional contact structure of the insert, so that the elasticity of the elastic groove provides a clamping force to the three-dimensional contact structure after insertion.

3. The terminal block according to claim 1, characterized in that, The three-dimensional contact structure is a sheet-like structure with periodic undulations extending along the insertion and removal direction. The periodic undulations are configured to increase the contact area between the insert and the assembly structure.

4. The terminal block according to claim 3, characterized in that, The periodic undulating structure is a continuous and smooth waveform structure with a wavy cross-section.

5. The terminal block according to claim 3, characterized in that, The periodic undulating structure is a broken line structure composed of multiple straight line segments connected end to end.

6. The terminal block according to claim 3, characterized in that, The periodic undulating structure includes a series of triangular, rectangular, or trapezoidal protrusions to form an outline with polygonal edges.

7. The terminal block according to claim 1, characterized in that, The tail end of the spring is provided with a first crimping part and a second crimping part in sequence along the wire insertion direction. The first crimping part is used to crimp and fix the conductor of the wire, and the second crimping part is used to crimp and fix the insulation layer of the wire.

8. The terminal block according to claim 7, characterized in that, The first crimping portion and the second crimping portion are formed by bending and stamping the metal sheet at the tail end of the spring.

9. The terminal block according to claim 1, characterized in that, The insert has a welded portion extending from the other end of the three-dimensional contact structure.

10. The terminal block according to claim 9, characterized in that, The welding part includes two parallel sheet-like welding feet, which are located on the same plane and spaced apart by a predetermined distance.

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