High strength fire resistant busway

Abstract

The utility model relates to a kind of high-strength fireproof bus duct, including two housings, and two respectively connect in the end cap of two housings upper and lower end, and the fixed support being set in the inner side of two housings and the copper bar being set on the fixed support, the utility model: its innovative four-layer side plate structure comprehensively solves the heat insulation and thermal expansion management problem of bus duct: from outside to inside, the outermost metal shell provides basic structure support;The inner side of first silicon carbide lining and aluminium silicate fiber felt layer composite, constitute efficient high-temperature heat shield, can significantly block the transmission of internal copper bar heat to shell, and the bidirectional telescopic structure set in the innermost side, actively, directional absorption and offset the huge axial stress generated in length direction by copper bar due to thermal expansion and contraction, avoid structural damage;Especially key is that the telescopic structure is embedded with elastic return element, so that it can be automatically reset when heat dissipates and copper bar shrinks.

Description

Technical Field

[0001] This utility model relates to a busbar trunking, specifically a high-strength fire-resistant busbar trunking. Background Technology

[0002] High-strength fire-resistant busbar trunking is a special power transmission equipment suitable for critical facilities such as high-rise buildings, airports, subways, and hospitals. As a power transmission and distribution device that replaces fire-resistant cables, it is made of steel shell (partially double-layer hollow structure with fire-retardant coating), busbar wrapped with fire-resistant mica tape, and high-temperature resistant insulating materials such as ceramics. It has excellent structural strength (e.g., the center deviation does not exceed 5mm when bearing a 70kg pressure at a 3-meter span) and fire resistance. It can work continuously at a high temperature of 900℃-1050℃ for 60-120 minutes. At the same time, the busbar trunking usually adopts a fully enclosed structure design, and the structural joints are sealed with high-temperature resistant sealant. The connector parts are also fully sealed.

[0003] The high-strength fire-resistant busbar trunking shell is mainly composed of cold-drawn thin steel profiles or high-quality galvanized steel sheets, and adopts a double-layer hollow structure design, including three main parts: side plates, cover plates, and bottom plates. Its core feature is its excellent fire resistance and heat insulation performance. The shell surface is coated with fire-retardant paint, and the shell interior is equipped with ceramic insulating end seats and fixing frames for supporting and fixing the busbar conductors.

[0004] When the busbar is in operation, the copper conductors generate heat as current flows through them, causing the temperature to rise and leading to thermal expansion. Since the length of the busbar trough is much larger than its width and height, the cumulative expansion in the length direction is the most significant due to the thermal expansion characteristics of the material. This expansion must be carefully considered and absorbed in the casing structure and installation design. In contrast, the expansion in the width and height directions is relatively small and usually within tolerance, so its impact on the overall structure is negligible.

[0005] Current busbar trunking products generally have significant engineering shortcomings in dealing with internal heat generation and thermal expansion effects:

[0006] Firstly, in terms of thermal insulation design, traditional side panel structures often have a single thermal insulation layer or insufficient material performance, which makes it easy for a large amount of heat generated by the copper busbar to be conducted to the metal shell during operation. This not only causes energy loss, but also makes the surface temperature of the shell too high, posing a risk of burns and affecting the safety of surrounding equipment.

[0007] Secondly, and more importantly, existing structures lack an effective axial stress management mechanism when dealing with the periodic thermal expansion and contraction of copper busbars. Simply leaving gaps or using rigid fixing methods cannot fully absorb the huge cumulative expansion in the length direction, resulting in stress with nowhere to be released, leading to structural deformation, loose connections, and even insulation damage. Furthermore, due to the lack of elastic reset capability, new gaps are generated after cooling and contraction, resulting in unreliable connections, increased contact resistance, and a vicious cycle of overheating, which seriously restricts the service life and operational safety of the product. Utility Model Content

[0008] The purpose of this invention is to provide a high-strength fire-resistant busbar trunking to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A high-strength fire-resistant busbar trunking includes two outer shells, two end caps respectively connected to the upper and lower ends of the two outer shells, a fixed bracket disposed on the inner side of the two outer shells, and a copper busbar disposed on the fixed bracket. The inner side of each of the two outer shells is provided with a first silicon carbide liner and an aluminum silicate fiber felt layer, and an inner shell assembly disposed on one side of the outer shell. The inner shell assembly is fixed to the fixed bracket. The inner shell assembly is provided with an elastic sealing component and an elastic return mechanism opened inside the inner shell assembly.

[0011] The high-strength fire-resistant busbar trunking described above: the inner sides of both end caps are provided with a second silicon carbide liner for heat insulation, and the end caps cooperate with the fixing bracket and copper busbar through the second silicon carbide liner.

[0012] The high-strength fire-resistant busbar trunking described above: the inner shell assembly includes a limiting shell disposed on one side of the outer shell and two sliding shells respectively disposed at both ends of the limiting shell, and the limiting shell and the two sliding shells are provided with oblique slots.

[0013] The high-strength fire-resistant busbar trunking described above: the oblique slots of the limiting shell and the sliding shells on both sides fit together, and the limiting shell has sliding grooves at both ends and a fixing sleeve fixedly installed on the sliding grooves. The fixing sleeve has a hollow interior design, and the fixing sleeve has grooves at both ends.

[0014] The high-strength fire-resistant busbar trunking described above: the elastic sealing assembly includes a first sealing gasket connected to the sliding housing, and second sealing gaskets are respectively connected to both ends of the limiting housing. The first sealing gasket and the second sealing gasket are used to provide a seal between the sliding housing and the limiting housing.

[0015] The high-strength fire-resistant busbar trunking described above has the following features: a sealing ring is provided on the outside of the sliding groove of the limiting housing; a limiting baffle is provided at one end of the fixing sleeve; and a spring is fitted on the fixing sleeve.

[0016] The high-strength fire-resistant busbar trunking described above: the elastic return mechanism includes a sliding column connected to one end of the sliding housing and an arc-shaped slider fixedly installed at both ends of the sliding column. The outer circle of the arc-shaped slider fits into the sliding groove, and the arc-shaped slider abuts against one end of the spring. The sliding column is slidably installed inside the fixed sleeve, and the arc-shaped slider slides into the grooves opened at both ends of the fixed sleeve.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] Its innovative four-layer side plate structure comprehensively solves the problems of heat insulation and thermal expansion management in busbar trunking: from the outside to the inside, the outermost metal shell provides basic structural support; its inner first silicon carbide liner and aluminum silicate fiber felt layer are combined to form a highly efficient high-temperature heat insulation barrier, which can significantly block the transfer of heat from the internal copper busbars to the shell, ensuring that the shell can still be safely touched and protect external equipment at high temperatures; while the innermost bidirectional telescopic structure can actively and directionally absorb and offset the huge axial stress generated by the thermal expansion and contraction of the copper busbars in the length direction, avoiding structural damage; most importantly, the telescopic structure has built-in elastic return elements, which can automatically reset when the heat dissipates and the copper busbars contract, thereby realizing adaptive cyclic adjustment of the dynamic process of thermal expansion, comprehensively improving the long-term operational reliability, safety and service life of the busbar trunking system.

[0019] This invention also constructs a highly efficient thermal barrier by adding a silicon carbide liner to the inner side of the upper and lower end plates. The silicon carbide material itself has extremely high thermal stability and thermal conductivity, which can quickly diffuse local heat, thereby significantly reducing the actual working temperature of the end plate substrate material. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a high-strength fire-resistant busbar trunking.

[0021] Figure 2 This is a side view of the structure of a high-strength fire-resistant busbar trunking.

[0022] Figure 3 This is a schematic diagram of the outer shell, fixing bracket, and copper busbar structure in a high-strength fire-resistant busbar trunking.

[0023] Figure 4 This is a schematic diagram of the internal structure of the outer shell of a high-strength fire-resistant busbar trunking.

[0024] Figure 5This is a schematic diagram showing the disassembled structure of the outer shell, first silicon carbide liner, aluminum silicate fiber felt, and inner shell assembly in a high-strength fire-resistant busbar trunking.

[0025] Figure 6 This is a schematic diagram showing another angle of disassembly of the outer shell, first silicon carbide liner, aluminum silicate fiber felt, and inner shell assembly in a high-strength fire-resistant busbar trunking.

[0026] Figure 7 This is a schematic diagram of the end cap and the second silicon carbide liner structure in a high-strength fire-resistant busbar trunking.

[0027] Figure 8 This is a schematic diagram of the limiting shell and sliding shell structure in a high-strength fire-resistant busbar trunking.

[0028] Figure 9 This is a schematic cross-sectional view of the limiting shell and sliding shell in a high-strength fire-resistant busbar trunking.

[0029] Figure 10 For high-strength fire-resistant busbar trunking Figure 9 Enlarged structural diagram of section A.

[0030] Figure 11 This is a schematic diagram of another depth section of the limiting shell and sliding shell in a high-strength fire-resistant busbar trunking.

[0031] Figure 12 This is a schematic diagram of the limiting shell and sliding shell in a high-strength fire-resistant busbar trunking, viewed from another depth.

[0032] Figure 13 This is a schematic diagram of the limiting shell structure in a high-strength fire-resistant busbar trunking.

[0033] Figure 14 This is a schematic diagram of the sliding shell structure in a high-strength fire-resistant busbar trunking.

[0034] Figure 15 This is a schematic diagram of the elastic return mechanism in a high-strength fire-resistant busbar trunking.

[0035] Figure 16 This is a schematic diagram showing the disassembly of the elastic return mechanism in a high-strength fire-resistant busbar trunking.

[0036] In the figure: 1. Outer shell; 2. First silicon carbide liner; 3. Aluminum silicate fiber felt; 4. Limiting shell; 5. Sliding shell; 6. End cap; 7. Second silicon carbide liner; 8. Fixed bracket; 9. Copper busbar; 10. Sliding groove; 11. Sealing ring; 12. Sliding column; 13. Arc slider; 14. Fixed sleeve; 15. Groove; 16. Spring; 17. First sealing gasket; 18. Second sealing gasket. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0038] Please see Figures 1-16 As an embodiment of the present invention, the high-strength fire-resistant busbar trunking includes two outer shells 1, two end caps 6 respectively connected to the upper and lower ends of the two outer shells 1, a fixed bracket 8 disposed on the inner side of the two outer shells 1, and a copper busbar 9 disposed on the fixed bracket 8. The inner side of each of the two outer shells 1 is provided with a first silicon carbide liner 2 and an aluminum silicate fiber felt layer 3, and an inner shell assembly disposed on one side of the outer shell 1. The inner shell assembly is fixed to the fixed bracket 8, and the inner shell assembly is provided with an elastic sealing component and an elastic return mechanism opened inside the inner shell assembly.

[0039] In this embodiment, the two side plates of the high-strength fire-resistant busbar trunking are equipped with a four-layer structure to comprehensively solve the problems of heat insulation and thermal expansion management of the busbar trunking: from the outside to the inside, the outermost metal shell 1 provides basic structural support; the first silicon carbide liner 2 and the aluminum silicate fiber felt layer 3 on its inner side are combined to form a highly efficient high-temperature heat insulation barrier, which can significantly block the transfer of heat from the internal copper busbar 9 to the shell 1, ensuring that the shell 1 can still be safely touched and protect external equipment at high temperatures; while the innermost inner shell assembly has a bidirectional telescopic structure, which can actively and directionally absorb and offset the huge axial stress generated by the thermal expansion and contraction of the copper busbar 9 in the length direction, avoiding structural damage; especially, the telescopic structure has a built-in elastic return element, which can automatically reset when the heat dissipates and the copper busbar 9 contracts, thereby realizing adaptive cyclic adjustment of the dynamic process of thermal expansion, and comprehensively improving the long-term operational reliability, safety and service life of the busbar trunking system.

[0040] As a further embodiment of this utility model, the inner sides of both end caps 6 are provided with a second silicon carbide liner 7 for heat insulation, and the end caps 6 cooperate with the fixing bracket 8 and the copper busbar 9 through the second silicon carbide liner 7.

[0041] In this embodiment, from the outside to the inside, the outermost metal shell 1 provides basic structural support; the first silicon carbide liner 2 on its inner side is combined with the aluminum silicate fiber felt layer 3 to provide heat insulation.

[0042] As a further embodiment of this utility model, the inner shell assembly includes a limiting shell 4 disposed on one side of the outer shell 1 and two sliding shells 5 respectively disposed at both ends of the limiting shell 4, wherein the limiting shell 4 and the two sliding shells 5 are provided with oblique slots.

[0043] In this embodiment, the innermost housing consists of three parts: a limiting housing 4 and two sliding housings 5.

[0044] As a further embodiment of this utility model, the oblique slots of the limiting housing 4 and the sliding housings 5 ​​on both sides fit together. The limiting housing 4 has sliding grooves 10 at both ends and fixed sleeves 14 fixedly installed on the sliding grooves 10. The fixed sleeves 14 have a hollow interior and grooves 15 at both ends.

[0045] In this embodiment, the limiting housing 4 and the two sliding housings 5 ​​fit together, and the limiting housing 4 and the two sliding housings 5 ​​are positioned at the same horizontal level.

[0046] As a further embodiment of this utility model, the elastic sealing assembly includes a first sealing gasket 17 connected to the sliding housing 5, and second sealing gaskets 18 connected to both ends of the limiting housing 4. The first sealing gasket 17 and the second sealing gasket 18 are used to provide a seal between the sliding housing 5 and the limiting housing 4.

[0047] In this embodiment, the first sealing gasket 17 and the second sealing gasket 18 are present in the sliding housing 5 and the limiting housing 4. At the same time, the first sealing gasket 17 and the second sealing gasket 18 are elastic and play a role in maintaining the sealing between the sliding housing 5 and the limiting housing 4.

[0048] As a further embodiment of this utility model, a sealing ring 11 is provided on the outside of the sliding groove 10 of the limiting housing 4, a limiting baffle is provided at one end of the fixing sleeve 14, and a spring 16 is sleeved on the fixing sleeve 14.

[0049] In this embodiment, the sealing ring 11 surrounds the sliding groove 10 to maintain the sealing between the limiting housing 4 and the sliding housing 5. The spring 16 can drive the sliding housing 5 and the limiting housing 4 to maintain a tight positional relationship in the initial state. In this case, the sealing ring 11 is in a compressed state.

[0050] As a further embodiment of this utility model, the elastic return mechanism includes a sliding column 12 connected to one end of the sliding housing 5 and an arc-shaped slider 13 fixedly installed at both ends of the sliding column 12. The outer circle of the arc-shaped slider 13 fits into the sliding groove 10, and the arc-shaped slider 13 abuts against one end of the spring 16. The sliding column 12 is slidably installed inside the fixed sleeve 14, and the arc-shaped slider 13 slides in cooperation with the grooves 15 opened at both ends of the fixed sleeve 14.

[0051] In this embodiment, the huge axial stress generated in the length direction of the copper busbar 9 due to thermal expansion and contraction is transmitted to the two sliding housings 5 ​​through the copper busbar 9 and the fixed bracket 8, causing the two sliding housings 5 ​​to slide at both ends of the limiting housing 4. At this time, a movement gap is generated. During the process, the first sealing plate 17, the second sealing plate 18 and the sealing ring 11 rebound to compensate for the gap and maintain the seal. At the same time, during the movement of the sliding housing 5, the sliding column 12 and the arc slider 13 at one end will slide outward. At this time, the arc slider 13 will squeeze the spring 16, directionally absorbing and offsetting the huge axial stress generated in the length direction of the copper busbar 9 due to thermal expansion and contraction. After the heat dissipates, the spring 16 will push the arc slider 13 back to its original position through elastic force, so that the copper busbar 9 can automatically reset when it contracts. This realizes the adaptive cyclic adjustment of the dynamic process of thermal expansion, and comprehensively improves the long-term operational reliability, safety and service life of the busbar system.

[0052] The above embodiments are exemplary and not restrictive. Therefore, without departing from the spirit or basic characteristics of this utility model, any technical solutions that can be implemented in other specific forms are included in this utility model.

Claims

1. A high-strength fire-resistant busbar trunking, comprising two outer shells (1), two end caps (6) respectively connected to the upper and lower ends of the two outer shells (1), a fixing bracket (8) disposed inside the two outer shells (1), and a copper busbar (9) disposed on the fixing bracket (8), characterized in that, The inner sides of the two outer shells (1) are provided with a first silicon carbide liner (2) and an aluminum silicate fiber felt layer (3), as well as an inner shell assembly disposed on one side of the outer shell (1). The inner shell assembly is fixed to the fixed bracket (8). The inner shell assembly is provided with an elastic sealing component and an elastic return mechanism opened inside the inner shell assembly.

2. A high strength fire resistant busway as defined in claim 1, wherein, The inner sides of both end caps (6) are provided with a second silicon carbide liner (7) for heat insulation. The end caps (6) are connected to the fixing bracket (8) and the copper busbar (9) through the second silicon carbide liner (7).

3. A high strength fire resistant busway as defined in claim 2 wherein, The inner shell assembly includes a limiting shell (4) disposed on one side of the outer shell (1) and two sliding shells (5) respectively disposed at both ends of the limiting shell (4). The limiting shell (4) and the two sliding shells (5) are provided with oblique slots.

4. A high strength fire resistant busway as defined in claim 3 wherein, The limiting housing (4) and the oblique slots of the sliding housings (5) on both sides fit together. The limiting housing (4) has sliding grooves (10) at both ends and fixed sleeves (14) fixedly installed on the sliding grooves (10). The fixed sleeves (14) are hollow inside and have grooves (15) at both ends.

5. A high strength fire resistant busway as defined in claim 4 wherein, The elastic sealing assembly includes a first sealing plate (17) connected to the sliding housing (5), and second sealing plates (18) connected to both ends of the limiting housing (4). The first sealing plate (17) and the second sealing plate (18) are used to provide a seal between the sliding housing (5) and the limiting housing (4).

6. A high strength fire resistant busway as defined in claim 5 wherein, A sealing ring (11) is provided on the outside of the sliding groove (10) of the limiting housing (4), a limiting baffle is provided at one end of the fixing sleeve (14), and a spring (16) is sleeved on the fixing sleeve (14).

7. A high strength fire resistant busway as defined in claim 6 wherein, The elastic return mechanism includes a sliding column (12) connected to one end of the sliding housing (5) and an arc slider (13) fixedly installed at both ends of the sliding column (12). The outer circle of the arc slider (13) fits into the sliding groove (10), and the arc slider (13) abuts against one end of the spring (16). The sliding column (12) is slidably installed inside the fixed sleeve (14), and the arc slider (13) slides in cooperation with the grooves (15) opened at both ends of the fixed sleeve (14).

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