A plug-in structure and a cast busbar plug-in box

Abstract

This utility model discloses a plug-in structure and a cast busbar plug-in box, including a pair of opposing clamping plates; a bending portion disposed in the middle of the clamping plates; a clamping portion bent inward from the bending portion to approach the other clamping plate; and a contact surface formed by the inner surface of the clamping portion; wherein the area of ​​the contact surface is larger than the surface area of ​​the inner side of the bending portion. This plug-in structure and cast busbar plug-in box uses a single sheet of material for a single bending operation, utilizing the clamping force of the bending portion itself to achieve a combination of clamping and current conduction effects, improving reliability, reducing production costs and structural complexity, and achieving a plug-in cross-sectional area ≥120mm². 2 It effectively reduces the current density per unit area, realizes a double-sided large-area surface contact structure, significantly increases the conductive area, and can stably transmit large currents up to 630A, meeting the operating requirements of medium and high power equipment.

Description

Technical Field

[0001] This utility model relates to the technical field of power supply connection device for branch of cast-in-place busbar in power system, and in particular to a plug-in structure and a plug-in box for cast-in-place busbar. Background Technology

[0002] As medium and low voltage power distribution systems develop towards high power density, cast iron busbars are widely used in high-current power supply scenarios such as industrial equipment, data centers, and rail transportation due to their excellent insulation performance and space integration capabilities. As the core of system connection, the plug-in junction box's performance is directly related to the safety and reliability of busbar operation.

[0003] Currently, most mainstream cast-in-place busbar junction boxes on the market adopt an air-type socket structure. The socket position of this structure is usually constructed in the form of line contact, and multiple socket units are arranged in a compact triangular pattern. Although this layout is conducive to structural integration, the limited conductor contact area and small spacing between socket points result in a limited overall heat dissipation path and a tendency for thermal stress to concentrate.

[0004] In practical applications, this type of plug-in structure can usually only support single-point plug-in current of 300A. When faced with high current requirements of 630A and above, such as large industrial and mining equipment and high-power power distribution trunk lines, existing air-type plug-in boxes are prone to overheating, unstable contact, and even abnormal losses, making it difficult to meet the application requirements of high current carrying capacity and thermal safety. Utility Model Content

[0005] In view of the problems existing in the above-mentioned plug-in structure and cast busbar plug-in box, this utility model is proposed.

[0006] Therefore, one of the objectives of this utility model is to provide a plug-in structure, the purpose of which is to provide a high-current plug-in structure that is easy to manufacture.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: including,

[0008] A pair of opposing clamps;

[0009] A bending portion is provided in the middle of the clamping plate;

[0010] A clamping portion, wherein the clamping portion bends inward from the bent portion to bring it closer to another clamping plate; and,

[0011] The contact surface is formed by the inner surface of the clamping part;

[0012] The area of ​​the contact surface is greater than the surface area of ​​the inner side of the bend.

[0013] In a preferred embodiment of the plug-in structure of this utility model, the distance between the oppositely arranged clamps is greater than the width of the conductor. In the plug-in state, the oppositely arranged contact surfaces are parallel to each other, and the distance between the contact surfaces is the same as the width of the conductor.

[0014] As a preferred embodiment of the plug-in structure of this utility model, the contact surface is a planar structure that extends along the plug-in direction, and its length along the extension direction is not less than the insertion length of the conductor.

[0015] As a preferred embodiment of the plug-in structure of this utility model, it further includes a guide portion, which is disposed at one end of the clamping portion, and the guide portion can be an arc-shaped or zigzag-shaped structure.

[0016] As a preferred embodiment of the plug-in structure of this utility model, a pressure plate is provided on the outer side of the clamping plate, and the middle part of the pressure plate arches outward.

[0017] One end of the pressing plate has a fixing part, and the other end away from the fixing part has a pressing part, and the pressing part is arranged opposite to the connection position of the guiding part and the clamping part.

[0018] As a preferred embodiment of the plug-in structure of this utility model, the clamping plate and the pressure plate are provided with multiple slots along their length direction, and the slots divide the clamping plate and the pressure plate into multiple segmented structures arranged at intervals along the width direction.

[0019] As a preferred embodiment of the plug-in structure of this utility model, the clamping plate and the pressure plate are provided with multiple slots along their length direction, and the slots divide the clamping plate and the pressure plate into multiple segmented structures arranged at intervals along the width direction.

[0020] The beneficial effects of this utility model are as follows: Using a single sheet of material for a single bend, the clamping force generated by the bend achieves a combination of clamping and current conduction, improving reliability and reducing production costs and structural complexity. Furthermore, due to the insertion cross-sectional area ≥120mm², the current density per unit area is effectively reduced. The larger contact area on both sides significantly increases the conductive area, enabling stable transmission of large currents up to 630A, meeting the operational requirements of medium-to-high power equipment. The front-end clamping structure formed by the bend naturally transforms into two parallel contact surfaces after insertion, eliminating the need for complex adjustments during insertion; insertion immediately positions the device, preventing misalignment or tilting. Additionally, by setting segmented slots on the clamping plate and pressure plate, the overall structure is divided into multiple independently elastic segmented clamping units, preventing poor local contact due to long-term stress fatigue. Simultaneously, segmented clamping of the units provides contact redundancy in case of localized losses, improving long-term operational stability and reliability.

[0021] Another objective of this invention is to provide a cast busbar plug-in box, the purpose of which is to provide a plug-in box with good heat dissipation.

[0022] As a preferred embodiment of the cast-in-place busbar plug-in box of this utility model, it includes a plug-in structure and further includes...

[0023] A connecting block, wherein both sides of the connecting block are fixedly connected to the clamping plate, and the outer side of the clamping plate is fixedly connected to the pressure plate;

[0024] An insulating plug-in device, which is provided with several plug-in structures;

[0025] The enclosure, wherein the insulating plug-in device is fixedly connected to the inside of the enclosure.

[0026] As a preferred embodiment of the cast busbar plug-in box of this utility model, the insulating plug-in device is provided with a plurality of mounting slots inside, and a plug-in structure is inserted into the inside of the mounting slots. The mounting slots are arranged at equal intervals along their length direction.

[0027] In a preferred embodiment of the cast busbar plug-in box of this utility model, the mounting grooves are staggered along the length direction of the insulating plug-in device.

[0028] As a preferred embodiment of the cast busbar plug-in box of this utility model, wherein: symmetrically arranged sealing plates are slidably connected on both sides of the box body, and symmetrically arranged springs are provided between the sealing plates.

[0029] The beneficial effects of this utility model are as follows: The housing is equipped with multiple standardized mounting slots, with embedded plug-in structures within the slots, supporting quick replacement, maintenance, and assembly. The mounting slots are arranged in an alternating pattern at equal intervals, isolating heat sources between adjacent conductors and reducing the risk of thermal stress concentration. Sliding sealing plates are configured on both sides of the housing, and the sealing plates are tightened by springs, automatically fitting and sealing the plug-in area. The spring return force also has an automatic correction function for the housing position, solving installation errors when plugging in at multiple points. The double-layer sealing rings and waterproof adhesive filling the gaps further enhance weather resistance, waterproofness, and electrical insulation, making it suitable for complex environments. Attached Figure Description

[0030] 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A schematic diagram of the connection process of the plug-in structure is shown;

[0032] Figure 2 A schematic diagram of the plug-in structure is shown;

[0033] Figure 3 A three-dimensional structural diagram of the plug-in structure is shown;

[0034] Figure 4 A three-dimensional schematic diagram of the assembly of the insulated plug-in device is shown;

[0035] Figure 5 A bottom-view three-dimensional diagram of the assembled insulated plug-in device is shown;

[0036] Figure 6 A schematic diagram of a half-section of the box structure is shown;

[0037] Figure 7 A schematic diagram of the top cross-section of the box is shown;

[0038] Figure 8 A schematic diagram of the plug-in cross-sectional structure of the housing is shown. Detailed Implementation

[0039] To enable those skilled in the art to better understand this utility model, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0040] The terminology used in this invention refers to those general terms currently widely used in the art in consideration of the functionality of this invention; however, these terms may vary according to the intent, precedent, or new technology of those skilled in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of this invention. Therefore, the terminology used in this specification should not be construed as simple names, but rather based on the meaning of the terms and the overall description of this invention.

[0041] Example 1, referring to Figure 1-3 This is the first embodiment of the present utility model, which provides a plug-in structure. This device includes a pair of opposing clamps 100; the distance between the opposing clamps 100 is greater than the width of the conductor. In the plug-in state, the opposing contact surfaces 103 are parallel to each other, and the distance between the contact surfaces 103 is the same as the width of the conductor; a bending portion 101 is provided in the middle of the clamps 100.

[0042] The clamping part 102 bends inward from the bending part 101 to approach another clamping plate 100; a pressure plate 200 is provided on the outer side of the clamping plate 100, and the pressure plate 200 arches outward at the middle position; a fixing part 201 is formed at one end of the pressure plate 200, and a pressing part 202 is formed at the end away from the fixing part 201; it also includes a guide part 300, which is provided at one end of the clamping part 102, and the guide part 300 can be an arc-shaped or zigzag-shaped structure; the pressing part 202 is arranged opposite to the connection position of the guide part 300 and the clamping part 102.

[0043] The contact surface 103 is formed by the inner surface of the clamping part 102; the contact surface 103 is a planar structure and extends along the insertion direction, and its length along the extension direction is not less than the insertion length of the conductor, wherein the area of ​​the contact surface 103 is greater than the surface area of ​​the inner side of the bending part 101.

[0044] Both the clamping plate 100 and the pressing plate 200 are provided with multiple slots 400, which divide the clamping plate 100 and the pressing plate 200 into multiple segmented structures arranged at intervals along the width direction.

[0045] During use, when the conductor is inserted, since the initial spacing between the clamping plates 100 is greater than the conductor width, the clamping part 102 will rotate around the bending part 101, so that the contact surface 103 gradually unfolds into a parallel fit state. At the same time, the bending part 101 forms an elastic fulcrum, providing elastic return force to clamp the conductor. Meanwhile, when the front end of the clamping plate 100 unfolds due to the conductor insertion, the pressure plate 200 itself applies inward force and uses the small lever formed by the arch to increase the clamping force on the clamping plate 100, avoiding the situation of insufficient clamping force due to metal fatigue of the clamping plate 100. At this time, the crimping part 202 can be located at any position outside the clamping plate 100.

[0046] Preferably, the crimping part 202 is disposed opposite to the connection area of ​​the clamping plate 100 and the guide piece 300. Since the crimping part 202 is directly opposite the connection area of ​​the guide piece 300, the crimping part 202 can apply an effective clamping force to the front end area of ​​the contact surface 103, while the bending part 101 generates pressure on the rear end area of ​​the contact surface 103, so that both ends of the contact surface 103 of the clamping plate 100 can obtain effective structural clamping support, ensuring that the surface contact is tightly fitted and the contact pressure is evenly distributed;

[0047] At this time, the clamping plate 100 naturally unfolds from the initial inclined state into a pair of parallel fitting structures, thereby forming a large-area contact surface (103) extending along the insertion direction, effectively improving the conductive contact interface, reducing the unit area resistance, and thus achieving a stable transmission capability of 630A current.

[0048] To maximize conductivity, the two contact surfaces 103 are planes extending along the conductor insertion direction, with a length not less than the conductor insertion depth. This ensures that after the conductor is inserted, it can form a sufficient contact stroke with the clamp 100. Compared to a short contact path, this long contact plane increases the cross-sectional area of ​​the conductive interface, significantly enhancing the current carrying capacity and stability, thereby supporting the stable transmission of a 630A high current.

[0049] During the insertion of the conductor into the gap area, the guide part 300 can guide the conductor to accurately enter the gap area, reduce the alignment time, and improve the insertion speed. The guide part 300 can be arc-shaped or zigzag-shaped.

[0050] Among them, the arc-shaped structure has the characteristic of smooth curvature change, which can provide a "natural transition" guide path, so that the conductor can automatically adjust its posture and align with the clamping direction during the sliding process; the zigzag structure has a chamfered front end and forms an inlet ramp by constructing a slope, which is more conducive to forming and processing than the arc shape and is suitable for mass stamping manufacturing.

[0051] To prevent the overall clamping plate 100 or pressure plate 200 from fatigue due to thermal expansion and contraction, mechanical vibration or long-term use, thus affecting contact stability, the clamping plate 100 and pressure plate 200 are provided with multiple slots 400 along their length direction. Each slot 400 penetrates the clamping plate 100 and pressure plate 200, dividing the clamping plate 100 structure into multiple segmented structures arranged along the width direction. Each segmented structure has a relatively independent clamping capacity. Even if a certain part is fatigued and loosened, it will not affect the contact effect of the remaining contact surfaces 102, thereby significantly improving the fatigue resistance and redundancy reliability of the plug-in structure.

[0052] Preferably, the multiple slots 400 are distributed at equal intervals. The equal-interval slots 400 can make each segment structure share the load evenly when the insertion pressure is transmitted, prevent local stress concentration, and thus extend the service life of the structure. At the same time, the equal-interval slots facilitate standardized mold processing and inspection control, and improve the accuracy of mass production.

[0053] Example 2, refer to Figure 4 , Figure 5 and Figure 6 This is the second embodiment of the present invention, which differs from the first embodiment in that it includes a plug-in structure and further includes...

[0054] A connecting block 500 is fixedly connected to the clamping plate 100 on both sides, and the outer side of the clamping plate 100 is fixedly connected to the pressure plate 200; an insulating plug-in device 600 is provided with several plug-in structures; a housing 700 is fixedly connected to the inside of the housing 700; the inside of the insulating plug-in device 600 is provided with several mounting slots 601, and plug-in structures are inserted into the inside of the mounting slots 601. The mounting slots 601 are arranged at equal intervals along their length direction; and the mounting slots 601 are staggered along the length direction of the insulating plug-in device 600.

[0055] Compared to Embodiment 1, since the plug-in structures in each row of plug slots 601 are all high-current contact components, they will generate significant heat during operation. The traditional structure is a triangular structure with close proximity between them. When a large current passes through, multiple heat sources will interfere with each other. By arranging them linearly, the distance between adjacent heat-generating elements is increased, avoiding the superposition of multiple heat sources and reducing the local high temperature caused by the overlap of the thermal field.

[0056] Preferably, to ensure heat dissipation performance under high current conditions, multiple plug-in structures are embedded in the insulating plug-in device 600 through staggered mounting slots 601. The multiple mounting slots 601 are equally spaced and staggered along the length direction, thereby increasing the spacing between adjacent plug-in structures, thus preventing interference between multiple heat sources and improving the thermal stability margin of the entire system.

[0057] The remaining structure is the same as that in Example 1.

[0058] Example 3, referring to Figure 6-8 This is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that: symmetrically arranged sealing plates 701 are slidably connected on both sides of the box body 700, and symmetrically arranged springs 702 are provided between the sealing plates 701.

[0059] Compared to Embodiment 2, further, sliding sealing plates 701 are respectively provided on the left and right sides of the plug-in box 700. Each sealing plate 701 can move on the box. The sealing plates 701 are connected by a spring 702. In the initial state, the spring 702 is in a stretched state and preloaded with a certain elastic force, so that the two sealing plates tend to move closer to each other and clamp together.

[0060] A sealing gasket is provided on the sealing plate 701 facing the plug-in surface. This sealing gasket is made of elastic insulating material and has good resilience and conformability to enhance the sealing contact effect. The operator aligns the plug-in box with the corresponding socket and gradually pushes it in. As the plug-in box 700 is inserted, the plug-in structure gradually contacts and conforms to the bus conductor socket, realizing electrical connection.

[0061] Meanwhile, during the advancement process, slight offsets or angular errors caused by the insertion action may cause a slight tilt in the posture of the insertion box. As the insertion action approaches the end point, the spring 702, under tension, pulls the sliding sealing plates 701 on both sides to slowly contract inward, so that they fit and press against the sides of the insertion box. Due to the elastic deformation characteristics of the sealing gasket, it can fit tightly against the surface of the box, fill the assembly tolerance gap, and form a stable sealed closure structure. Due to the symmetrical tension of the spring, if the insertion box is slightly tilted during the advancement process, the spring 702 will generate an asymmetrical tension difference. This differential force will produce a differential pressing effect on the sealing plate 701, thereby applying an automatic correction torque to the insertion box and guiding it to the centerline position, realizing automatic posture adjustment and insertion positioning correction.

[0062] The remaining structure is the same as that in Example 2.

[0063] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0064] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A plug-in structure, characterized in that: include, A pair of opposing clamps (100); A bending portion (101) is provided in the middle of the clamping plate (100); A clamping portion (102) bends inward from the bending portion (101) to bring it close to another clamping plate (100); and, The contact surface (103) is formed by the inner surface of the clamping part (102); The area of ​​the contact surface (103) is greater than the surface area of ​​the inner side of the bent portion (101).

2. The plug-in structure according to claim 1, characterized in that: The distance between the oppositely arranged clamps (100) is greater than the width of the conductor. In the plugged-in state, the oppositely arranged contact surfaces (103) are parallel to each other, and the distance between the contact surfaces (103) is the same as the width of the conductor.

3. The plug-in structure according to claim 2, characterized in that: The contact surface (103) is a planar structure and extends along the insertion direction, and its length along the extension direction is not less than the insertion length of the conductor.

4. The plug-in structure according to claim 2 or 3, characterized in that: It also includes a guide (300), which is disposed at one end of the clamping part (102), and the guide (300) can be an arc-shaped or zigzag-shaped structure.

5. The plug-in structure according to claim 4, characterized in that: A pressure plate (200) is provided on the outer side of the clamping plate (100), and the pressure plate (200) arches outward at the middle position; One end of the pressure plate (200) has a fixing part (201), and the other end away from the fixing part (201) has a pressing part (202), and the pressing part (202) is arranged opposite to the connection position of the guide part (300) and the clamping part (102).

6. The plug-in structure according to claim 5, characterized in that: The clamping plate (100) and the pressing plate (200) are each provided with a plurality of slots (400), which divide the clamping plate (100) and the pressing plate (200) into a plurality of segmented structures arranged at intervals along the width direction.

7. A cast-in-place busbar junction box, characterized in that: Including plug-in structure, and also, A connecting block (500) is fixedly connected to both sides of a clamping plate (100), and the outer side of the clamping plate (100) is fixedly connected to a pressure plate (200). An insulated plug-in device (600) having several plug-in structures thereon; The housing (700) has the insulating plug-in device (600) fixedly connected inside the housing (700).

8. The cast-in-place busbar connector box according to claim 7, characterized in that: The insulating plug-in device (600) has a plurality of mounting slots (601) inside, and a plug-in structure is inserted into the mounting slot (601). The mounting slots (601) are arranged at equal intervals along their length.

9. The cast-in-place busbar connector box according to claim 8, characterized in that: The mounting slots (601) are staggered along the length of the insulating plug-in device (600).

10. The cast-in-place busbar connector box according to claim 9, characterized in that: The housing (700) is slidably connected to two sides of a symmetrically arranged sealing plate (701), and a symmetrically arranged spring (702) is provided between the sealing plates (701).

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