Grounding assembly for busway power connection device

Abstract

The application discloses a grounding assembly for a bus duct power connection device, and relates to the field of bus ducts. The structure comprises a body unit with a conductive function and a pressure self-adaptive contact mechanism arranged on the unit. The bottom surface of the body unit vertically extends to form a columnar connecting part, and the upper surface is provided with a rectangular-section mounting groove. Horizontal inner recessed sub-groove structures are arranged on both sides of the mounting groove along the width direction, and the inner surfaces of the sub-grooves and the corresponding contact areas are provided with conductive enhancement plating. The power connection assembly has high connection stability and reliability after being connected with the bus duct.

Description

Technical Field

[0001] This application relates to the field of busbar trunking, and in particular to a grounding assembly for a busbar trunking connection device. Background Technology

[0002] As a core component of high-current power distribution systems, the grounding reliability of busbar trunking directly affects power supply safety and equipment lifespan. In existing technologies, the conductive connection between busbar trunking and the connecting device commonly employs a metal spring structure, such as elastic contacts made of beryllium copper or phosphor bronze. A balance between mechanical resilience and conductivity is achieved through stamping and surface plating processes. These springs are typically pressed between the busbar trunking shell and the connecting device in a single-point or multi-point contact manner, utilizing material elasticity to maintain contact pressure. However, in actual operation, the heat generated by factors such as conductor resistance loss and contact resistance at the insertion points (typically reaching 55-70℃) in the busbar trunking leads to significant thermal stress relaxation in the springs: when the temperature exceeds 85℃, the elastic modulus of beryllium copper decreases by approximately 15%, and the yield strength of phosphor bronze decreases by more than 20%, causing the contact pressure of the springs to decrease non-linearly with increasing temperature. This vicious cycle causes the contact resistance to climb from the initial 50mΩ to over 100mΩ, exacerbating the Joule heating effect and causing local overheating, ultimately leading to accelerated plating oxidation, permanent deformation of the spring, and even welding failure. Utility Model Content

[0003] The purpose of this application is to overcome at least one deficiency of the prior art by providing a grounding component for a busbar trunking connection device, which has high connection stability and reliability after being connected to the busbar trunking.

[0004] To achieve the above objectives, this application discloses a grounding component for a busbar trunking connection device, the structure of which includes a conductive body unit and a pressure adaptive contact mechanism disposed on the unit.

[0005] The main body unit has a columnar connecting part that extends vertically from the bottom surface, and a rectangular cross-section mounting groove is provided on the upper surface. The mounting groove has horizontally recessed sub-groove structures on both sides along the width direction, and the inner surface of the sub-groove and the corresponding contact area are provided with a conductive enhancement coating.

[0006] The pressure adaptive contact mechanism consists of several parallel elastic contact units, each of which includes a trapezoidal contact piece and a composite spring assembly connected to its bottom.

[0007] The composite spring assembly consists of a layered structure formed by combining a shape memory alloy layer and a high-elasticity steel layer, with both ends embedded and fixed in the sub-grooves on both sides of the mounting groove. In its initial assembled state, the composite spring maintains a radial torsional shape. When the operating temperature changes, the shape memory alloy layer undergoes thermal deformation in a predetermined direction, increasing the contact pressure through a bimetallic effect.

[0008] The bottom sides of the contact piece extend to form wedge-shaped contact portions, which extend into the sub-groove and form a surface contact conductive path with the silver-plated inner surface.

[0009] The bottom of the mounting slot is equipped with a liftable support adjustment mechanism, which includes a threaded adjustment rod and a support platform. By rotating the adjustment rod, the height position of the support platform can be changed, thereby adjusting the preload of the composite spring assembly.

[0010] Furthermore, the thickness of the silver plating layer between the sub-groove and the contact part is 0.05-0.1mm, which ensures both conductivity and structural stability.

[0011] Compared with the prior art, this application has at least one of the following beneficial technical effects:

[0012] 1. The layered structure of the composite elastic support actively generates compensating deformation under high-temperature conditions through the synergistic effect of shape memory alloy and high-elasticity steel layer, effectively offsetting the thermal softening effect of the material, maintaining stable contact pressure, and fundamentally blocking the vicious cycle of contact resistance increasing with temperature.

[0013] 2. The gradient coating structure combined with the multi-layer metal deposition process improves the conductivity of the contact surface and enhances the resistance to high-temperature oxidation, significantly reducing the resistance increase caused by coating deterioration during long-term operation.

[0014] 3. The adjustable pressure support mechanism achieves dynamic compensation of contact pressure through mechanical fine adjustment, breaking through the maintenance limitations of irreversible deformation of traditional spring sheets, greatly extending the service life of components and reducing operation and maintenance costs.

[0015] The beneficial effects listed above are not exhaustive of all advantages. Other potential beneficial effects and detailed technical implementation methods will be further disclosed in the embodiments or other descriptive sections of this application. Attached Figure Description

[0016] A better understanding of various aspects of this disclosure will be achieved by reading the following detailed description in conjunction with the accompanying drawings. The positions, dimensions, and extents of the structures shown in the drawings, etc., do not always represent actual positions, dimensions, and extents. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of one embodiment disclosed in this application from a certain perspective.

[0018] Figure 2 This is a schematic diagram of the structure of one embodiment disclosed in this application from another perspective.

[0019] Figure 3 This is a structural schematic diagram of one embodiment disclosed in this application from another perspective.

[0020] Figure 4 This is a schematic diagram of the composite spring sheet in one embodiment of the present application.

[0021] Figure 5 This is a schematic diagram of a partial cross-sectional structure of the composite spring sheet in one embodiment of this application. Detailed Implementation

[0022] The present disclosure will now be described with reference to the accompanying drawings, which illustrate several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure more complete and to fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments.

[0023] It should be understood that the same reference numerals denote the same elements in all the accompanying drawings. For clarity, the dimensions of certain features may be modified in the drawings.

[0024] It should be understood that the terminology used in this specification is for describing specific embodiments only and is not intended to limit this disclosure. All terms used in this specification (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. For the sake of brevity and / or clarity, techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail; however, where appropriate, such techniques, methods, and apparatus should be considered part of this specification.

[0025] Unless otherwise specified, the singular forms “a,” “the,” and “the” used in this specification include the plural forms. The terms “comprising,” “including,” and “containing” used in this specification indicate the presence of the claimed feature but do not exclude the presence of one or more other features. The term “and / or” used in this specification includes any and all combinations of one or more of the relevant listed items.

[0026] See attached document Figures 1 to 5In this embodiment, a grounding component for a bus trunking connection device is provided. The component is organically combined with a conductive body unit 1 and a pressure adaptive contact mechanism disposed on the body unit 1. The components cooperate with each other to achieve stable and reliable grounding, providing a strong guarantee for the safety of the bus trunking connection.

[0027] The main body unit 1 serves as the foundation of the entire grounding assembly. Its bottom surface extends vertically to form a columnar connecting part 2. This columnar connecting part 2, like the main body unit 1, is made of high-purity copper, a material with excellent conductivity and mechanical strength, ensuring smooth conduction of grounding current and a stable connection to the external grounding system. Simultaneously, the upper surface of the main body unit 1 has a rectangular cross-section mounting groove 3, with horizontally recessed secondary grooves 4 along the upper edges of both sides in the width direction. The inner surface of the secondary grooves 4 and the corresponding contact areas are plated with a conductivity-enhancing coating. This coating, primarily composed of silver, has a precisely controlled thickness within the range of 0.05-0.1 mm. This significantly improves conductivity, reduces contact resistance, and minimizes energy loss. Furthermore, it ensures structural stability, avoiding problems such as increased material costs and reduced structural strength caused by excessively thick coatings. During installation, the columnar connecting part 2 of the main body unit 1 can be directly inserted into the grounding connection position of the busbar trunking, achieving initial mechanical fixing and electrical connection.

[0028] In this embodiment, the pressure-adaptive contact mechanism consists of several parallel elastic contact units 5. These elastic contact units 5 are closely arranged and jointly undertake the important task of maintaining close contact with the busbar and transmitting current. Each elastic contact unit 5 includes a trapezoidal cross-section contact piece 501 and a composite spring assembly 502 connected to its bottom. The contact piece 501 is made of a copper alloy material with high conductivity, possessing good flexibility and fatigue resistance, and can adapt to frequent changes in contact pressure. The bottom sides of the contact piece 501 extend to form wedge-shaped contact portions. This special design allows the wedge-shaped contact portions to extend more robustly into the sub-slot 4 during operation, forming a surface contact conductive path with the inner surface of the silver-plated sub-slot 4, greatly increasing the contact area, reducing the contact resistance, and ensuring that the current can be efficiently transmitted from the busbar to the main unit 1, thereby achieving a good grounding effect.

[0029] The composite spring assembly 502, a crucial component of this embodiment, employs a layered structure formed by combining a shape memory alloy layer 5021 and a high-elasticity steel layer 5022. The two layers are tightly bonded, creating a close-knit collaborative working mechanism. The shape memory alloy layer 5021 can be made of nickel-titanium alloy, exhibiting excellent shape memory effect and thermal response characteristics. The high-elasticity steel layer 5022 can be made of high-quality spring steel, ensuring the basic elastic performance of the spring. The two ends of the composite spring assembly 502 are embedded and fixed within the secondary grooves 4 on both sides of the mounting groove 3. In the initial assembled state, due to the controlled assembly process, the composite spring assembly 502 maintains a radial torsional shape, accumulating a certain amount of elastic potential energy internally. When the operating temperature changes, usually when the temperature rises, the shape memory alloy layer 5021 will undergo thermal deformation in a predetermined direction. This deformation, through the bimetallic effect principle, drives the entire composite spring assembly 502 to deform, thereby increasing the contact pressure on the contact piece. This ensures that the elastic contact unit 5 can always maintain close contact with the busbar under different operating conditions. Even if the busbar experiences slight displacement due to thermal expansion and contraction, it can automatically adapt through the deformation of the composite spring, maintaining a good electrical contact state.

[0030] To further optimize the performance of the grounding assembly, a height-adjustable support mechanism 6 is also provided at the bottom of the mounting slot 3. This mechanism includes a threaded adjusting rod 601 and a support platform 602. The threaded adjusting rod 601 is made of high-strength stainless steel, which has good corrosion resistance and mechanical strength and can withstand the stress during long-term use. The support platform 602 is also made of copper alloy, forming a reliable support fit with the composite spring assembly. In actual operation, by rotating the threaded adjusting rod 601, the height position of the support platform 602 can be precisely changed, thereby indirectly adjusting the preload of the composite spring assembly 502. In the initial stage of installation, a suitable preload can be preset according to the specific specifications of the busbar trunking and the actual connection situation to ensure that the elastic contact unit 5 is in close contact with the busbar trunking. In subsequent use, if changes in contact pressure are found, the threaded adjusting rod 601 can be finely adjusted to restore and maintain the optimal contact state. This adjustable design greatly enhances the applicability and flexibility of the grounding assembly, enabling it to adapt to different models of busbar trunking and changing working environments.

[0031] Furthermore, in this embodiment, the working surface of the contact piece 501 has a trapezoidal gradient structure, with its narrow end close to the busbar groove contact surface. This trapezoidal gradient structure makes the contact stress distribution between the contact piece 501 and the busbar groove more uniform and reasonable. In the initial contact stage, the narrower end can quickly establish a preliminary contact connection. As pressure is gradually transmitted, the contact stress of the entire trapezoidal structure gradually disperses, avoiding problems such as poor contact or material deformation caused by localized stress concentration. This effectively improves the stability and reliability of the contact and extends the service life of the grounding assembly.

[0032] In practical applications of busbar trunking grounding devices, such as during the installation of power distribution systems in large industrial plants, after installing this grounding component at the corresponding position in the busbar trunking, its unique structural design ensures safe, stable, and efficient current transmission from the busbar trunking to the grounding system. Compared with traditional grounding methods, the grounding component in this embodiment, even under complex conditions such as temperature changes and vibrations during long-term operation, can maintain a good grounding effect through the synergistic action of the pressure-adaptive contact mechanism and the support adjustment mechanism. This greatly reduces the risk of electrical faults caused by poor grounding, improves the safety and reliability of the entire power distribution system, and has significant practical value and broad application prospects. Those skilled in the art should understand that the parts not disclosed in detail above, such as certain conventional mechanical connection methods, fall within the scope of known and existing technologies and can be flexibly selected and applied according to actual needs.

[0033] The above embodiments illustrate in detail the structural composition of the grounding component of the busbar trunking connection device, the connection and cooperation relationship of each component, and the working principle, fully demonstrating its technical advantages and practical application value, and providing detailed reference for those skilled in the art to understand and implement the technical solution.

[0034] While exemplary embodiments of this disclosure have been described, those skilled in the art will understand that various changes and modifications can be made to the exemplary embodiments of this disclosure without departing from the spirit and scope thereof. Therefore, all changes and modifications are included within the scope of protection of this disclosure as defined by the claims. This disclosure is defined by the appended claims, and equivalents of those claims are also included.

Claims

1. A grounding assembly for a busbar trunking connection device, characterized in that, Its structure includes a conductive body unit and a pressure-adaptive contact mechanism disposed on the unit; The main body unit extends vertically from the bottom surface to form a columnar connecting part, and a rectangular cross-section mounting groove is provided on the upper surface. The mounting groove has horizontally recessed sub-groove structures on both sides along the width direction, and the inner surface of the sub-groove and the corresponding contact area are provided with a conductive enhancement plating layer. The pressure adaptive contact mechanism is composed of several elastic contact units arranged in parallel. Each elastic contact unit includes a trapezoidal contact piece and a composite spring assembly connected to its bottom. The composite spring assembly is a layered structure formed by combining a shape memory alloy layer and a high-elasticity steel layer, with its two ends embedded and fixed in the secondary grooves on both sides of the mounting groove. The bottom sides of the contact piece extend to form wedge-shaped contact portions, which extend into the sub-groove and form a surface contact conductive path with the silver-plated inner surface.

2. The grounding assembly for a busbar trunking connection device as described in claim 1, characterized in that, The bottom of the mounting slot is equipped with a liftable support adjustment mechanism, which includes a threaded adjustment rod and a support platform. By rotating the adjustment rod, the height position of the support platform can be changed, thereby adjusting the preload of the composite spring assembly.

3. The grounding assembly for a busbar trunking connection device as described in claim 1, characterized in that, The thickness of the silver plating layer between the sub-groove and the contact area of ​​the contact piece is 0.05-0.1mm.

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