A commutation unit and bus duct

Abstract

This invention relates to a commutation unit and a busbar trunking system, comprising a commutation unit body in an L-shape, with conductive elements disposed on the inner side of the body. Through the material selection and structural design of the expansion alloy cylinder, an adaptive vertical expansion and extrusion function is achieved under high-current heating conditions. The use of a locking nut and an elastic cylinder enables pre-tightening of the hot-extruded components during assembly, ensuring a constant extrusion pressure on the clamping plate. This ensures a tight fit between the conductive layer on the conductive connecting plate and the contact plate, effectively preventing contact loosening caused by equipment vibration and conventional thermal expansion and contraction, significantly reducing conductive contact resistance, and guaranteeing the long-term conductive stability and reliability of the busbar trunking.

Description

Technical Field

[0001] This invention belongs to the field of busbar trunking, specifically a commutation unit and a busbar trunking. Background Technology

[0002] Busbar trunking is a core power distribution device for power transmission, characterized by its large current carrying capacity, neat wiring, and convenient disassembly and maintenance. It is widely used in various large-scale power load scenarios. The commutation structure, as a key component for busbar trunking reversal and connection, ensures the continuity of line conduction. Conventional rigid bolt-locking connections are simple, low-cost, and highly versatile, meeting the conductivity requirements of typical small to medium current conditions. However, existing structures have significant drawbacks. They lack a pre-tightening compensation structure, making them prone to loosening under long-term vibration and alternating hot and cold temperatures, increasing contact resistance and causing localized heating. They lack adaptive adjustment, making them unsuitable for high-current, high-temperature conditions. When the temperature rises, they cannot automatically compensate for the contact gap, easily creating a vicious cycle of heating and causing oxidation and erosion of the contact surface. Furthermore, their fixed structural parameters cannot adapt to different operating conditions, lack elastic reset capability, have a short service life, high maintenance costs, and poor operational safety and adaptability. Therefore, a new commutation unit and busbar trunking are proposed. Summary of the Invention

[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0004] Given the following technical problems in the existing technology: without a pre-tightening compensation structure, long-term exposure to vibration and alternating hot and cold temperatures can easily lead to loose connections, increased contact resistance, and localized heating.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a commutation unit and a busbar trunking, comprising a commutation unit, the commutation unit comprising a commutation unit body, the commutation unit body being L-shaped; The commutation unit and the busbar trunking are connected by connectors. The busbar trunking includes the busbar trunking body and a cover plate. Conductive components are provided on the inner side of both the commutation unit body and the busbar trunking body. A maintenance port is provided on one side of the busbar trunking body, and a cover plate is provided on the outer side of the busbar trunking body. The cover plate closes the maintenance port.

[0006] As a preferred technical solution for a commutation unit and busbar trunking, the conductive component includes conductive sheets and contacting sheets. An insulating layer is provided on the outer side of the conductive sheets. The conductive sheets are closely arranged, and a contacting sheet is provided at each end of the conductive sheets. The contacting sheets are spaced apart.

[0007] As a preferred technical solution for a commutation unit and a busbar trunking, both the commutation unit body and the busbar trunking body are square cylinders. The square cylinder includes two I-beams and two U-shaped plates. The two I-beams are parallel to each other, and a U-shaped plate is provided on each side of the I-beam. The I-beams and U-shaped plates form a cylindrical structure. The I-beams and U-shaped plates are connected by rivets, and conductive components are located on the inner side of the square cylinder.

[0008] As a preferred technical solution for a commutation unit and busbar trunking, the square cylinder also includes an elastic pad, and the inner side of the U-shaped plate is provided with an elastic pad, which separates the conductive components from the U-shaped plate.

[0009] As a preferred technical solution for a commutation unit and busbar trunking, the square cylinder also includes protective plates. Two protective plates are provided at each end of the cylindrical structure. The protective plates are located outside the contact plates, forming a sandwich structure.

[0010] As a preferred technical solution for a commutation unit and busbar trunking, the connector includes a conductive connecting plate, a clamping plate, a connecting rod, a locking nut, and a connecting bolt. There are two clamping plates and three or more conductive connecting plates. The conductive connecting plates are arranged in parallel and positioned between two clamping plates. Two adjacent conductive connecting plates clamp a contact plate. The connecting rod passes through the middle of the conductive connecting plate and the clamping plate. One end of the connecting rod is provided with a hexagonal nut, and the other end of the connecting rod is fitted with a hot-extruded part. The bottom end of the hot-extruded part abuts against the clamping plate. The other end of the connecting rod is also provided with a connecting bolt. The connecting bolt is threaded with two locking nuts, and the locking nuts abut against the hot-extruded part.

[0011] As a preferred technical solution for a commutation unit and busbar trunking, the hot-extruded component includes a base plate, a bottom cylinder, a top cover, and elastic elements. The top cover is sleeved with the bottom cylinder, the bottom end of the bottom cylinder is provided with a base plate, and several elastic elements are provided between the base plate and the top cover.

[0012] As a preferred technical solution for a commutation unit and busbar trunking, the connector also includes a limiting frame, a rectangular plate and a mounting cylinder. Two limiting frames are provided on the outer side of the clamping plate, and a rectangular plate is clamped on the inner side of the limiting frame. A mounting cylinder is provided in the middle of the rectangular plate, and the hot-extruded part is accommodated on the inner side of the mounting cylinder.

[0013] As a preferred technical solution for a commutation unit and busbar trunking, the connector also includes a conductive layer. One or two conductive layers are provided on the conductive connecting plate, and the conductive layer is in close contact with the outer side of the connecting piece.

[0014] As a preferred technical solution for a commutation unit and busbar trunking, the connector also includes extrusion strips and insulating connecting cylinders. An insulating connecting cylinder is provided in the middle of the conductive connecting plate, and the connecting rod passes through the insulating connecting cylinder. Several extrusion strips are provided at intervals on the clamping plate, and the extrusion strips abut against the conductive connecting plate.

[0015] The beneficial effects of the commutation unit and busbar trunking of the present invention are as follows: by using the locking nut and the elastic cylinder together, the hot extrusion parts are compressed and pre-tightened during the assembly process, so that the hot extrusion parts always maintain elastic compression on the clamping plate, and the conductive layer on the conductive connecting plate is tightly attached to the contact piece, which effectively avoids contact loosening caused by equipment operation vibration and conventional thermal expansion and contraction, greatly reduces conductive contact resistance, and ensures the long-term conductive stability and reliability of the busbar trunking.

[0016] By adjusting the ratio of the expansion alloy cylinder to the elastic cylinder, the equipment achieves multi-condition adaptability. Through the material selection and structural design of the expansion alloy cylinder, adaptive vertical expansion and compression under high-current heating conditions are achieved. The expansion alloy cylinder is made of high-expansion nickel-iron alloy, possessing a high coefficient of thermal expansion and rapid temperature rise response. Through heat conduction generated by the high current flowing through the conductive components, the expansion alloy cylinder achieves precise axial expansion in the vertical direction, continuously pushing the clamping plates closer together, further tightening the conductive connection structure, thereby reducing the resistance of the contact parts, effectively suppressing the vicious cycle of high-current heating, and improving the dynamic and thermal stability of the equipment. It also enables elastic compensation under high and low temperature conditions.

[0017] The elastic cylinder is made of high-temperature resistant insulating elastic material. When used in conjunction with the expansion alloy cylinder, it achieves elastic rebound and reset after high-temperature expansion and extrusion, avoiding rigid extrusion deformation of the structure. At the same time, it can continuously provide elastic preload, adapting to the working scenarios of repeated start-stop and alternating hot and cold temperatures, and extending the service life of the equipment.

[0018] By flexibly adjusting the length, wall thickness, and assembly quantity ratio of the two components, precise adaptation to different rated currents and temperature rise levels can be achieved. Under high current conditions, the proportion of expansion alloy cylinders can be increased to enhance the hot extrusion effect, while under normal conditions, the proportion of elastic cylinders can be increased to optimize pre-tightening and seismic performance. This greatly expands the applicability of the device and enhances the flexibility and practicality of the structural design. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of 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. Wherein: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a three-dimensional structural diagram of the conductive element of the present invention; Figure 4 This is a front structural diagram of the connector of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the hot-extruded part of the present invention.

[0020] Reference numerals: 100, commutation unit; 101, commutation unit body; 200, busbar trunking; 201, busbar trunking body; 202, cover plate; 300, connector; 301, conductive connecting plate; 302, clamping plate; 303, connecting rod; 304, extrusion strip; 305, limiting frame; 306, rectangular plate; 307, mounting cylinder; 308, locking nut; 309, conductive layer; 310, connecting bolt; 311, insulating connecting cylinder; 400, conductive component; 401, conductive sheet; 402, contacting sheet; 501, I-beam plate; 502, U-shaped plate; 503, elastic pad; 504, protective sheet; 600, hot extruded component; 601, base plate; 602, base cylinder; 603, top cover; 604, center column; 605, maintaining column; 606, expansion alloy cylinder; 607, elastic cylinder. Detailed Implementation

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0023] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0024] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0025] like Figures 1-5 As shown, the present invention proposes a commutation unit and busbar trunking, including a commutation unit 100, the commutation unit 100 including a commutation unit body 101, the commutation unit body 101 being L-shaped, and a conductive element 400 being provided on the inner side of the commutation unit body 101. The commutation unit 100 is connected to the bus trunking 200 via a connector 300. The bus trunking 200 includes a bus trunking body 201 and a cover plate 202. A maintenance port is provided on one side of the bus trunking body 201, and a cover plate 202 is provided on the outer side of the bus trunking body 201. The cover plate 202 closes the maintenance port, and the internal structure of the bus trunking body 201 can be repaired through the maintenance port.

[0026] The conductive element 400 includes a conductive sheet 401 and a contact sheet 402. An insulating layer is provided on the outer side of the conductive sheet 401. The conductive sheets 401 are closely arranged, and a contact sheet 402 is provided at each end of the conductive sheet 401. The contact sheets 402 are spaced apart.

[0027] Both the commutation unit body 101 and the busbar trunking body 201 are square tubes. The square tube includes two I-beams 501 and two U-shaped plates 502. The two I-beams 501 are parallel to each other. A U-shaped plate 502 is provided on each side of the I-beams 501. The I-beams 501 and the U-shaped plates 502 form a cylindrical structure. The I-beams 501 and the U-shaped plates 502 are connected by rivets. The conductive component 400 is located on the inner side of the square tube.

[0028] The square tube also includes an elastic pad 503. An elastic pad 503 is provided on the inner side of the U-shaped plate 502, and the elastic pad 503 separates the conductive component 400 from the U-shaped plate 502.

[0029] The square tube also includes protective plates 504. Two protective plates 504 are provided at each end of the cylindrical structure. The protective plates 504 are located on the outside of the electrical contact plate 402, forming a sandwich structure.

[0030] The connector 300 includes a conductive connecting plate 301, a clamping plate 302, a connecting rod 303, a locking nut 308, and a connecting bolt 310. There are two clamping plates 302 and three or more conductive connecting plates 301. The conductive connecting plates 301 are arranged in parallel and positioned between two clamping plates 302. Two adjacent conductive connecting plates 301 clamp a contact piece 402. The connecting rod 303 passes through the middle of the conductive connecting plate 301 and the clamping plate 302. One end of the connecting rod 303 is provided with a hexagonal nut, and the other end of the connecting rod 303 is fitted with a hot-extruded part 600. The bottom end of the hot-extruded part 600 abuts against the clamping plate 302. The other end of the connecting rod 303 is also provided with a connecting bolt 310. The connecting bolt 310 is threaded with two locking nuts 308, and the locking nuts 308 abut against the hot-extruded part 600.

[0031] The hot extrusion part 600 includes a base plate 601, a bottom cylinder 602, a top cover 603, and elastic elements. The top cover 603 is sleeved with the bottom cylinder 602. The bottom end of the bottom cylinder 602 is provided with the base plate 601. Several elastic elements are provided between the base plate 601 and the top cover 603. The elastic elements compress the base plate 601 and the top cover 603, causing the hot extrusion part 600 to compress the rectangular plate 306, thereby achieving pre-tightening.

[0032] The connector 300 also includes a limiting frame 305, a rectangular plate 306 and a mounting cylinder 307. Two limiting frames 305 are provided on the outer side of the clamping plate 302. The rectangular plate 306 is snapped into the inner side of the limiting frame 305. The mounting cylinder 307 is provided in the middle of the rectangular plate 306. The hot extruded part 600 is accommodated on the inner side of the mounting cylinder 307.

[0033] The connector 300 also includes a conductive layer 309. One or two conductive layers 309 are provided on the conductive connecting plate 301. The conductive layer 309 is in close contact with the outer side of the contact piece 402, so that current can be transmitted.

[0034] The connector 300 also includes an extrusion strip 304 and an insulating connecting cylinder 311. The insulating connecting cylinder 311 is provided in the middle of the conductive connecting plate 301. The connecting rod 303 passes through the insulating connecting cylinder 311. Several extrusion strips 304 are provided at intervals on the clamping plate 302. The extrusion strips 304 abut against the conductive connecting plate 301.

[0035] The elastic element includes a central column 604, a retaining column 605, and an elastic extrusion structure. The elastic cylinder 607 is a U-shaped elastic structure. Several central columns 604 are arranged in a ring on the inner side of the top cover 603 and the bottom plate 601. The central columns 604 on the bottom plate 601 correspond one-to-one with the central columns 604 on the top cover 603. An elastic extrusion structure is provided between the central columns 604 on the bottom plate 601 and the corresponding central columns 604 on the top cover 603. The elastic extrusion structure includes an expansion alloy cylinder 606 and an elastic cylinder 607. The length of the central column 604 is more than 1.5 times the height of the elastic extrusion structure. An elastic extrusion structure is sleeved on the central column 604 with a clearance fit. The elastic extrusion structures not connected to the central column 604 are connected by a retaining column 605. The outer side of the retaining column 605 elastically extrudes the inner side of the elastic extrusion structure. The expansion alloy cylinder 606 expands when heated, pressing the two clamping plates 302 closer to each other. The clamping plates 302 press the conductive layer 309 on the conductive connecting plate 301 to adhere more tightly to the surface of the electrode sheet 402, thereby reducing the conductivity resistance. By reasonably configuring the length of the retaining column 605, an elastic extrusion structure is inserted at both ends of each retaining column 605. The number of expansion alloy cylinders 606 on each elastic element is more than three.

[0036] The elastic cylinder 607 accumulates elastic potential energy under compression, and the tightening of the locking nut 308 compresses the elastic cylinder 607, giving the hot extruded part 600 a pre-tightening force, so that the hot extruded part 600 can tightly compress the clamping plate 302 even under normal conditions.

[0037] After the expansion alloy cylinder 606 expands due to heat, the diameter of the internal cavity of the expansion alloy cylinder 606 increases, and the retaining column 605 remains in close contact with the inner wall of the internal cavity of the expansion alloy cylinder 606.

[0038] The inner cavity of the bottom cylinder 602 ensures that its inner wall never comes into contact with the outer side of the expansion alloy cylinder 606. The expansion alloy cylinder 606 is made of a high-expansion nickel-iron alloy such as 4J50 or 4J42, which has a large coefficient of thermal expansion and fast response. When the busbar trunking generates a large amount of heat under high current operation, it can generate significant axial elongation in the vertical direction, forming a stable expansion extrusion force.

[0039] The 607 elastic cylinder is made of high-temperature resistant silicone rubber or polyurethane elastomer, which has high elasticity, aging resistance and insulation properties. It provides stable preload at room temperature, does not soften or crack at high temperature, and can be repeatedly compressed and rebounded to ensure the long-term elastic compensation capability of the structure.

[0040] The specific implementation method is as follows: the commutation unit 100 is aligned with the busbar 200, and multiple conductive connecting plates 301 are clamped between two clamping plates 302, so that the adjacent conductive connecting plates 301 hold the contact piece 402, and the connecting rod 303 passes through the insulating connecting cylinder 311, the conductive connecting plate 301 and the clamping plate 302 in sequence to complete the initial positioning. A hot-extruded component 600 is fitted onto the end of the connecting rod 303. The hot-extruded component 600 is fixed in place by the limiting frame 305, the rectangular plate 306, and the mounting cylinder 307. Then, two locking nuts 308 are tightened on the connecting bolt 310. The locking nuts 308 compress the hot-extruded component 600 and the internal elastic cylinder 607, so that the entire set of connecting components 300 forms a stable preload, ensuring that all components fit tightly under normal conditions. After the equipment is powered on, it generates heat. The expansion alloy cylinder 606 inside the hot-extruded component 600 expands due to the heat, further pushing the two side clamping plates 302 closer together. The clamping plates 302, together with the extrusion strip 304, press the conductive connecting plate 301, making the conductive layer 309 fit more tightly with the contact piece 402, effectively reducing the overall conductivity resistance. The central column 604 and the maintaining column 605 provide positioning and support for the expansion alloy cylinder 606 and the elastic cylinder 607, ensuring that the elastic extrusion structure will not shift under pressure and heat conditions, thus improving the operational stability of the equipment. When the equipment requires maintenance, the cover plate 202 can be directly removed, and the internal conductive structure can be inspected and replaced through the maintenance port on the busbar trunking body 201, making the operation convenient.

[0041] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention 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 solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A commutation unit and busbar trunking, characterized in that: It includes a commutation unit, which includes a commutation unit body. The commutation unit body is L-shaped, and a conductive element is provided on the inner side of the commutation unit body. The commutation unit is connected to the busbar trunking via a connector. The busbar trunking includes a busbar trunking body and a cover plate. A maintenance opening is provided on one side of the busbar trunking body, and a cover plate is provided on the outside of the busbar trunking body to close the maintenance opening. The connector includes a conductive connecting plate, a clamping plate, a connecting rod, a locking nut, and a connecting bolt. There are two clamping plates and three or more conductive connecting plates. The conductive connecting plates are arranged in parallel and positioned between two clamping plates. Two adjacent conductive connecting plates clamp a contact plate. The connecting rod passes through the middle of the conductive connecting plate and the clamping plate. One end of the connecting rod is equipped with a hexagonal nut, and the other end of the connecting rod is fitted with a hot-extruded component. The bottom end of the hot-extruded component abuts against the clamping plate. The other end of the connecting rod is also equipped with a connecting bolt. The connecting bolt is threaded with two locking nuts, and the locking nuts abut against the hot-extruded component. The hot extruded part includes a base plate, a base cylinder, a top cover and elastic elements. The top cover is sleeved with the base cylinder, the bottom end of the base cylinder is provided with a base plate, and several elastic elements are provided between the base plate and the top cover. The elastic component includes a central column, a retaining column, and an elastic extrusion structure. Several central columns are arranged in a ring on the inner side of the top cover and the bottom plate. The central columns on the bottom plate correspond one-to-one with the central columns on the top cover. An elastic extrusion structure is provided between the central columns on the bottom plate and the corresponding central columns on the top cover.

2. The commutation unit and busbar trunking according to claim 1, characterized in that: The conductive component includes a conductive sheet and a contacting sheet. An insulating layer is provided on the outer side of the conductive sheet, and a contacting sheet is provided at each end of the conductive sheet. The contacting sheets are spaced apart.

3. The commutation unit and busbar trunking according to claim 1, characterized in that: Both the commutation unit body and the busbar trunking body are square tubes. The square tube includes two I-beams and two U-shaped plates. The two I-beams are parallel to each other, and a U-shaped plate is set on each side of the I-beam. The I-beams and U-shaped plates form a cylindrical structure. The I-beams and U-shaped plates are connected by rivets. The conductive components are set on the inside of the square tube.

4. The commutation unit and busbar trunking according to claim 3, characterized in that: The square tube also includes an elastic pad, and the inner side of the U-shaped plate is provided with an elastic pad, which separates the conductive component from the U-shaped plate.

5. A commutation unit and busbar trunking according to claim 3, characterized in that: The square tube also includes protective plates. Two protective plates are provided at each end of the cylindrical structure. The protective plates are located outside the electrical contact plate, forming a sandwich structure.

6. The commutation unit and busbar trunking according to claim 1, characterized in that: The connector also includes a limiting frame, a rectangular plate, and a mounting cylinder. Two limiting frames are provided on the outer side of the clamping plate, and a rectangular plate is snapped into the inner side of the limiting frame. A mounting cylinder is provided in the middle of the rectangular plate, and the hot extruded part is accommodated on the inner side of the mounting cylinder.

7. The commutation unit and busbar trunking according to claim 1, characterized in that: The connector also includes a conductive layer. One or two conductive layers are provided on the conductive connecting plate, and the conductive layer is in close contact with the outer side of the contact piece.

8. A commutation unit and busbar trunking according to claim 1, characterized in that: The connector also includes extrusion strips and insulating connecting cylinders. The insulating connecting cylinder is provided in the middle of the conductive connecting plate, the connecting rod passes through the insulating connecting cylinder, and several extrusion strips are provided at intervals on the clamp plate, with the extrusion strips abutting against the conductive connecting plate.

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