Cable tray unit and cable tray system

Abstract

The present invention relates a cable tray unit and a cable tray system. The cable tray unit comprises a bottom tray, a top tray and lock fastening assemblies, wherein the bottom tray has a bottom and two lower sidewalls extending from two opposite sides of the bottom toward a top; the top tray has the top and two upper sidewalls extending from two opposite sides of the top toward the bottom; the two lower sidewalls of the bottom tray and the two upper sidewalls of the top tray are arranged opposite each other, respectively; and the lock fastening assemblies fixedly connect the lower sidewalls and upper sidewalls opposite each other. While meeting the requirements for safe electric power operation, the cable tray unit also enables explosive force generated when a cable explodes to be limited within a tray.

Description

Cable trough unit and cable trough system

[0001] This patent application claims priority from the following Chinese patent applications:

[0002] Filing date: December 1, 2023; Application number: 202311631874.2; Invention title: Cable trough unit and cable trough system;

[0003] The entirety of the above application is incorporated herein by reference. Technical Field

[0004] The present invention relates to the technical field of cable trough box systems, and in particular to a cable trough box unit and a cable trough box system configured to accommodate high-voltage power transmission cables in a cable tunnel. Background Art

[0005] In many countries and regions, including Singapore, China, Japan, South Korea, etc., underground transmission cable tunnels are built to supply power, free up ground for surface road traffic and construction space, and prevent dangerous accidental contact with overhead power lines. For example, Singapore has strict requirements for power supply to meet industrial, commercial and residential needs. Singapore has a large underground tunnel network to carry cables, pipelines and other infrastructure. These tunnels are used for power transmission, water supply, sewage treatment and communications.

[0006] Power transmission cable tunnels can be located up to 60-80m below ground level. High-voltage power cables are separated in cable troughs within the cable tunnels. Cable troughs must be quick to install and maintain and offer excellent fire and explosion safety features.

[0007] The existing trough box system is designed to release pressure through elastic expansion. It consists of two U-shaped troughs, one on top of the other. During installation, the upper trough box is placed on top of the lower trough box, and elastic straps are used to tie the two boxes together at intervals of approximately 0.8 meters. Guide blocks are installed approximately 0.8 meters on both sides of the lower trough box interface. If a cable explodes inside the trough box, the box will be pushed open. These blocks restrict the box's vertical upward movement during this process. When the cable installed in the trough box explodes, the impact force generated by the explosion will push the upper cover of the trough box open a certain gap. Since the lower cover is equipped with enough guide blocks and enough elastic straps, the explosive force will push the upper cover of the upper trough box upward to create a large enough gap to release the pressure generated by the explosion (the size of the opening gap is related to the tightness of the straps and the size of the explosive force). The explosive force generated by the explosion will be released to both sides from the gaps on both sides of the trough box. When the internal pressure is released, the upper cover of the trough box returns to the installation position along the guide blocks of the lower cover trough box under the action of gravity and the tension of the straps, so that the upper and lower trough boxes are closed and sealed again. The combustion in the trough box will automatically extinguish because there is not enough fresh air inside the trough box to support the combustion.

[0008] However, when this type of trough box system that elastically expands to release pressure explodes and releases pressure, it will directly release the shock wave, flames, pressure, high temperature, and harmful smoke generated by the explosion into the work area. During the pressure release process, melted metal objects, burning cables, and other PE materials due to the high temperature will also be ejected from the gap. If there are workers working near the explosion point at this time, the high-temperature splashes of the explosion parameters accompanied by the shock wave will injure surrounding personnel and equipment, and may cause irreversible and fatal damage to personnel.

[0009] In addition, since the positions of the installation straps and the trough box guide blocks are fixed, the trough box needs to be installed on the bracket. The position of the bracket must be staggered with the position of the straps and the position of the interface between the two sections of the trough box. The staggering method is to pre-order trough boxes of different lengths. This requires that when ordering the project, the installation path and bracket position of the entire cable trough box need to be entered into the computer, and the on-site installation must be simulated in the computer to determine the final order. This makes the design and installation of existing cable trough boxes more cumbersome.

[0010] Furthermore, because the interface between the two sections of the trough box is designed with one section pressed on the next, a special trough box is required every 50 meters to disconnect the left and right sections of the trough cover. This means that if the cable inside the trough box needs to be repaired, the trough cover must be removed starting from this special trough cover and continuing to the required location, rather than directly opening the trough cover at the repair location. This results in additional work when repairing the trough boxes inside the trough box.

[0011] Therefore, the present invention proposes a cable trough box and a trough box system that meet the requirements of safe power operation, which has better safety and can also be easy to transport, install, maintain, etc.

[0012] Summary of the Invention

[0013] The purpose of the present invention is to provide a cable trough box unit that meets the needs of safe electricity transportation and can limit the high-temperature and high-speed ejected cable fragments, high-temperature harmful gases, etc. generated when the cable explodes to the inside of the trough box.

[0014] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0015] A cable trough box unit, comprising:

[0016] A bottom trough box, the bottom trough box having a bottom and two lower side walls extending from opposite sides of the bottom toward the top;

[0017] A top trough box, the top trough box having a top and two upper side walls extending from opposite sides of the top toward the bottom;

[0018] Locking components;

[0019] The two lower side walls of the bottom trough box and the two upper side walls of the top trough box are respectively arranged opposite to each other, and the locking assembly is fixedly connected to the opposite lower side walls and the upper side walls.

[0020] In one embodiment, the locking assembly includes a fastener pair and a locking piece, the fastener pair includes two fastener units located on the inner and outer sides of the junction of the lower side wall and the upper side wall respectively, and the locking piece fixedly connects the two fastener units.

[0021] In one embodiment, the lower side wall and the upper side wall both include an inner flange extending to the inner side of the corresponding side wall and an outer flange extending to the outer side of the corresponding side wall, and the fastener unit is provided with a lower boss portion and an upper boss portion corresponding to the inner flange or the outer flange, and the lower boss portion and the upper boss portion cooperate with the inner flange or the outer flange to limit the separation of the bottom trough box and the top trough box.

[0022] In one embodiment, the back surfaces of the inner flange and the outer flange facing the corresponding lower boss portion or the upper boss portion are a first inclined surface, and the first inclined surface is inclined toward the top of the lower side wall or the upper side wall connected thereto, and the surfaces of the lower boss portion and the upper boss portion facing the lower boss portion or the upper boss portion are a second inclined surface, and the second inclined surface is basically parallel to the first inclined surface.

[0023] In one embodiment, the locking member includes a screw and a nut, the rod portion of the screw passes through the two fastener units of the same fastener pair, and the nut locks the two fastener units.

[0024] In one embodiment, the locking member further includes a limiting block, and the limiting block is passed through the rod portion of the screw.

[0025] In one embodiment, the locking member further includes an elastic member, and the elastic member is passed through the rod portion of the screw.

[0026] In one embodiment, the fastener unit is further provided with a middle boss portion located between the upper boss portion and the lower boss portion.

[0027] In one embodiment, there is a height difference between the two lower side walls of the bottom trough box, and there is also a height difference between the two upper side walls of the top trough box.

[0028] In one embodiment, the top trough box includes a diameter-reducing section.

[0029] In one embodiment, the trough box unit further includes a support member, and the support member is fixed to the bottom trough box.

[0030] In one embodiment, ribs are provided on the inner sides of the two lower side walls of the bottom trough box, and the ribs and the lower side walls form grooves for fixing the support member.

[0031] In one embodiment, both ends of the bottom trough box have indented portions where no ribs are provided.

[0032] In one embodiment, the cable trough box unit also includes an extended side panel, and the extended side panel is arranged between the lower side wall of the bottom trough box and the upper side wall of the top trough box opposite thereto, and the locking assembly is fixedly connected to the opposite lower side wall and the extended side panel, and the locking assembly is fixedly connected to the opposite upper side wall and the extended side panel.

[0033] A cable trough box system includes a trough box unit and a lining, wherein the lining is located at the junction of adjacent trough box units, and multiple trough box units are connected to each other through the lining. It is characterized in that the trough box unit includes any cable trough box unit described above.

[0034] The present invention employs the above-mentioned technical solution, resulting in the beneficial effects of fully coupling the top and bottom troughs of the cable trough unit structure provided by the present invention, employing a fully sealed cable trough design without pressure relief. In the event of an explosion of a cable within the trough, the high-temperature fragments generated by the explosion are completely confined within the trough under the action of high pressure, preventing them from flying around and injuring surrounding personnel and equipment. Furthermore, the trough of the present invention requires few components and is easy to install. To inspect cables at a specific location within the trough, only the top trough at the designated location needs to be removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG1 shows a perspective schematic diagram of a first trough box unit.

[0036] FIG2 shows a schematic cross-sectional view of the first trough box unit.

[0037] FIG3 shows a perspective schematic diagram of the first bottom trough box.

[0038] FIG4 shows a perspective schematic diagram of the first top trough box.

[0039] FIG5 shows a schematic diagram of a liner.

[0040] FIG6 shows a schematic diagram of a fastener pair.

[0041] FIG. 7 shows a schematic diagram of the locking assembly.

[0042] FIG8 shows a partial enlarged view of the junction of the first bottom trough box and the first top trough box.

[0043] FIG9 shows a schematic cross-sectional view of a fastener pair.

[0044] FIG10 shows a partial enlarged view of the locking assembly when it is locked at the junction of the first bottom tank box and the first top tank box.

[0045] FIG11 shows a schematic cross-sectional view of the first bottom trough box, the first top trough box and the liner.

[0046] FIG12 shows a perspective schematic diagram of the second trough box unit.

[0047] FIG13 shows a schematic cross-sectional view of the second bottom trough box, the second top trough box and the liner.

[0048] FIG14 shows a perspective schematic diagram of the third trough box unit.

[0049] FIG15 shows a schematic diagram of a cable trough system composed of different trough units.

[0050] FIG16 is a schematic diagram showing a non-linear cable trough system composed of trough units.

[0051] FIG17 shows a perspective schematic diagram of the fourth trough box unit.

[0052] FIG18 shows a schematic cross-sectional view of the fourth trough box unit.

[0053] FIG19 shows a schematic cross-sectional view of the fourth bottom trough box, the fourth top trough box and the extended side panel. DETAILED DESCRIPTION

[0054] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the present invention can be more clearly understood. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0055] In the following description, for the purpose of illustrating the various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other cases, well-known devices, structures, and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0056] Unless the context requires otherwise, throughout the specification and claims, the word "comprise" and variations such as "include" and "have" should be construed in an open, inclusive sense, that is, should be interpreted to mean "including, but not limited to."

[0057] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0058] As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and / or" unless the context clearly dictates otherwise.

[0059] In the following description, in order to clearly show the structure and working mode of the present invention, many directional words will be used for description, but words such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and should not be understood as restrictive terms.

[0060] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0061] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0062] The present invention provides a cable trough box system, which includes a plurality of trough box units in a roughly rectangular shape. The plurality of trough box units are connected to each other by connecting liners to form a slender main body having a cavity for accommodating cables and related equipment (such as cooling pipes), so as to protect the cables in the trough box and the personnel and facilities outside the trough box.

[0063] As shown in Figures 1 to 10, a conventional segment cable trough box is shown, which includes a plurality of first trough box units 10 that are roughly rectangular in shape. The plurality of first trough box units 10 can be connected to each other through a first lining 12 to form an elongated cable trough box for accommodating cables and related equipment.

[0064] Referring to Figures 3 and 4, the first trough box unit 10 includes a first trough box 11 and a first locking assembly 13. The first trough box 11 is composed of a first bottom trough box 111 and a first top trough box 112. The first bottom trough box 111 is a U-shaped trough box, which is installed on a bracket in a cable tunnel. The first top trough box 112 is an inverted U-shaped trough box, which is installed on the top of the first bottom trough box 111 and cooperates with the first bottom trough box 111 to form a roughly rectangular cavity, which is used to accommodate cables and related facilities. In order to achieve fireproof and explosion-proof performance, the first bottom trough box 111 and the first top trough box 112 are both made of flame-retardant materials, such as flame-retardant fiber reinforced plastic (FR-FRP). These materials have sufficient strength and are highly flame-retardant and fire-resistant, which can effectively slow the spread of fire.

[0065] Referring to Figures 1 and 5, the first lining 12 is fixed or fastened to the joint of two adjacent first trough box units 10, connecting the two adjacent first trough box units 10 to form a seal or a roughly dense connection. The first lining 12 in this embodiment includes a U-shaped bottom lining member 121 that matches the first bottom trough box 111 and a U-shaped top lining member 122 that matches the first top trough box 112. During installation, the bottom lining member 121 connects the two adjacent first bottom trough boxes 111 by bolts, and the top lining member 122 connects the two adjacent first top trough boxes 112 by bolts. The first lining 12 can be made of the same flame retardant material as the trough box, such as flame retardant fiber reinforced plastic (FR-FRP). These materials have sufficient strength and are highly flame retardant and fire resistant, which can effectively slow the spread of fire.

[0066] Referring to Figures 1 and 2, the first bottom trough box 111 is also equipped with support members 14, which are used to support equipment such as cooling pipes. After the cables are laid in the trough box, multiple support members 14 are installed at regular intervals within the box. The cooling pipes are then placed on the support members 14, positioning them above the cables to cool the power cables during power transmission. If the cables are not cooled properly, they may derate due to high temperatures. The support members 14 also provide a certain degree of isolation or spacing between the cables and the cooling pipes.

[0067] In this embodiment, ribs 1112 extending along the length of the first bottom box 111 are provided on both opposing inner sidewalls. The ribs 1112 have a generally L-shaped cross-section, and their bottoms are connected to the first bottom box 111. Together with the inner wall of the first bottom box 111, they form a groove that supports and accommodates the bottom of the support member 14, thereby allowing the support member to be fixed to the first bottom box 111. Preferably, the ribs 1112 terminate at both ends of the first bottom box 111, forming retracted portions that avoid the bottom lining member 121. This not only does not affect the assembly of the bottom lining member 121, but also serves to position and limit the installation of the bottom lining member 121.

[0068] The first locking assembly 13 securely connects the first bottom trough box 111 and the first top trough box 112 into a sealed unit. If a cable installed within the cable trough box explodes due to a short circuit, the connection structure of the first locking assembly 13 can withstand the explosive force generated by the cable explosion, confining the impact force, various high-temperature fragments, and harmful fumes generated by the explosion within the trough box. These forces will not be ejected from the trough box and harm personnel and equipment, thereby improving the safety of the cable trough system. Furthermore, the trough box components in this embodiment are relatively small, consisting only of a bottom trough box, a top trough box, and a locking assembly. This not only facilitates on-site installation, but also allows for inspection of cables at a specific location within the trough box by simply removing the top trough box at the designated location.

[0069] 6-7 , the first locking assembly 13 in this embodiment includes a fastener pair 131 and a locking member 132. The fastener pair 131 is composed of two fastener units 1310 located on the inner and outer sides of the trough box, respectively. The locking member 132 locks the fastener pair 131 to fix the first bottom trough box 111 and the first top trough box 112 into a sealed whole.

[0070] Preferably, referring to Figures 3-4 and 6-10, the top of the side walls on both sides of the first bottom trough box 111 include a first lower flange portion 1111, and the top of the side walls on both sides of the first top trough box 112 include a first upper flange portion 1121. The first lower flange portion 1111 and the first upper flange portion 1121 both include an inner flange extending to the inside of the trough box and an outer flange extending to the outside of the trough box, so that the first lower flange portion 1111 and the first upper flange portion 1121 and their respective side walls form a structure with a roughly T-shaped cross-section.

[0071] The top surfaces facing each other of the first lower flange portion 1111 and the first upper flange portion 1121 are both planes, and the back surfaces of the inner flange and outer flange of the first lower flange portion 1111 and the first upper flange portion 1121 opposite to the top surfaces are both inclined surfaces, and the inclined surfaces are inclined from the outer edges of the respective flange portions toward the middle, that is, the inclined surfaces gradually reduce the thickness of each flange portion from the outer edge toward the middle, and the inclined surfaces can cooperate with the fastener pair 131 to better fix the first bottom trough box 111 and the first top trough box 112, so that when the cable in the cable trough box short-circuits and explodes, the first trough box unit 10 can withstand the explosive force generated by the cable explosion, and limit the impact force, various high-temperature fragments, harmful smoke, etc. generated by the explosion to the inside of the trough box.

[0072] The two fastener units 1310 of the fastener pair 131 are mirror images of each other, each comprising a main body 1311 extending along the length of the slot box, a lower boss portion 1312, an upper boss portion 1313, and a middle boss portion 1314 located between the lower boss portion 1312 and the upper boss portion 1313, projecting from the main body 1311 toward the same side. The main body 1311, the lower boss portion 1312, the upper boss portion 1313, and the middle boss portion 1314 form a structure with a generally E-shaped cross-section. The lower boss portion 1312 and the middle boss portion 1314 define a space for accommodating the inner or outer flange of the corresponding first lower flange portion 1111, and the surface of the lower boss portion 1312 facing the inner or outer flange of the corresponding first lower flange portion 1111 is an inclined surface generally parallel to the inclined surface of the inner or outer flange. Similarly, the upper boss portion 1313 and the middle boss portion 1314 form a space for accommodating the inner or outer flange of the corresponding first upper flange portion 1121, and the surface of the lower boss portion 1312 facing the inner or outer flange of the corresponding first upper flange portion 1121 is provided with an inclined surface substantially parallel to the inclined surface of the inner or outer flange. In the event of a short circuit explosion in the cable within the trough box, the fastener pair 131 cooperates with the inclined surfaces of the inner and outer flanges of the first lower flange portion 1111 and the first upper flange portion 1121 to effectively prevent the first lower flange portion 1111 and the first upper flange portion 1121 from separating in the vertical direction, thereby enhancing the structural strength of the entire trough box and allowing it to withstand the explosive force of the explosion.

[0073] 7 and 10 , the locking member 132 includes a screw 1321 and a nut 1322 that matches the screw 1321. Preferably, the locking member 132 also includes a limit block 1323 and an elastic member 1324. The rod of the screw 1321 is integrally formed with the E-shaped fastener unit 1310 inside the trough box. Thus, when the E-shaped fastener unit 1310 inside the trough box is installed, the screw 1321 passes through the limit block 1323, which supports and fixes the E-shaped fastener unit 1310 inside the trough box so that it does not fall into the trough box. After the screw 1321 of the internal E-shaped fastener passes through the external fastener unit 1310, the nut 1322 locks the two fastener units 1310, thereby fixing the first bottom trough box 111 and the first top trough box 112 into a sealed whole. A stopper 1323 is provided on the screw 1321. When the locking member 132 secures the two fastener units 1310, the stopper 1323 is located between the central bosses 1314 of the two fastener units 1310. The stopper 1323 abuts against the central bosses 1314 of the fastener units 1310, preventing deformation of the fastener units 1310 due to excessive tightening force and simultaneously securing the internal E-shaped fastener units 1310. Two elastic members 1324 are provided, both sleeved on the screw 1321 and located on either side of the stopper 1323. These elastic members 1324 act as buffers to prevent the nut from loosening due to vibration.

[0074] Referring to Figure 10 , the left and right sidewalls of the first bottom trough box 111 are of different heights. In the figure, the left sidewall of the first bottom trough box 111 is taller than the right sidewall. Of course, in practice, the right sidewall could also be taller than the left sidewall. This non-uniform design allows for better adaptation to various on-site installation spaces. For example, in situations where space is limited, the lower side could be positioned closer to construction personnel, making it easier to place cables and related equipment.

[0075] Referring to Figures 12-13, a cable trough box in a joint well section is shown, which includes at least one second trough box unit 20 in a roughly rectangular shape and a second lining 22. The second trough box unit 20 has a structure basically the same as that of the first trough box unit 10, and includes a second trough box 21 and a second locking assembly 23.

[0076] The second trough box 21 is composed of a second bottom trough box 211 and a second top trough box 212. The second lining 22 is fixed or fastened to the joint of two adjacent second trough box units 20, connecting the two adjacent second trough box units 20 to form a seal or a roughly dense connection. The second locking assembly 23 fixes the second bottom trough box 211 and the second top trough box 212 into a sealed whole. When a short circuit explosion occurs in the cable installed in the cable trough, the connection structure of the second locking assembly 23 can withstand the explosive force generated by the cable explosion, and limit the impact force, various high-temperature fragments, harmful smoke, etc. generated by the explosion to the inside of the trough box, and will not be ejected from the inside of the trough box to harm workers and equipment, thereby improving the safety of the cable trough system.

[0077] Since the structure of the second trough box 21 is basically the same as that of the first trough box 11, the parts with the same structure will not be repeated here. Referring to Figures 11 and 13, the main difference between the second trough box 21 and the first trough box 11 is that the height difference ΔH2 of the side walls on both sides of the second bottom trough box 211 is larger than the height difference ΔH1 of the side walls on both sides of the first bottom trough box 111, that is, ΔH2>ΔH1. Since the obstruction of the side wall on one side of the trough box is reduced, it is more convenient for construction workers to carry out construction at the cable joint. Due to the change in the height of the side walls on both sides of the second bottom trough box 211, the height of the side walls on both sides of the second top trough box 212 also changes accordingly to adapt to the second bottom trough box 211. Similarly, the height of the side wall of the second lining 22 also changes accordingly.

[0078] 14 , a variable-diameter cable trough is also shown, comprising at least one third trough unit 30 in a substantially elongated shape and a third lining 32 . The third trough unit 30 comprises a third trough box 31 and a third locking assembly 33 .

[0079] The third trough box 31 is composed of a third bottom trough box 311 and a third top trough box 312. The third lining 32 is fixed or fastened to the joint of two adjacent third trough box units 20, connecting the two adjacent trough box units to form a seal or a roughly dense connection. The third locking assembly 33 fixes the third bottom trough box 311 and the third top trough box 312 into a sealed whole. When a short circuit explosion occurs in the cable installed in the cable trough box, the connection structure of the third locking assembly 33 can withstand the explosive force generated by the cable explosion, and limit the impact force, various high-temperature fragments, harmful smoke, etc. generated by the explosion to the inside of the trough box, and will not be ejected from the inside of the trough box to injure personnel and equipment, thereby improving the safety of the cable trough box system.

[0080] Because the structure of the third trough box 31 is essentially identical to that of the first trough box 11, the common structural features will not be reiterated here. Referring to Figure 13 , the primary difference between the third trough box 31 and the first trough box 11 lies in the addition of a reducing section 3121 to the third top trough box 312. This reducing section 3121 allows the calibers at the junction of the two sides of the third trough box 31 to differ, allowing it to connect to trough boxes of varying calibers. Due to the varying calibers at the junction of the two sides of the third trough box 31, the dimensions of the third liner 32 also vary accordingly.

[0081] Refer to Figure 15, which shows a schematic diagram of a cable trough system composed of at least one of the above-mentioned first trough box unit 10, the second trough box unit 20 and the third trough box unit 30. a in Figure 15 shows a schematic diagram of a small-diameter trough box connecting a large-diameter trough box through a variable-diameter trough box; b shows a schematic diagram of the connection between equal-diameter trough boxes; c shows a schematic diagram of a large-diameter trough box connecting a small-diameter trough box through a variable-diameter trough box; d shows a schematic diagram of connecting two small-diameter trough boxes through a variable-diameter trough box.

[0082] Referring to Figure 16 , a schematic diagram illustrating a cable trough system formed by at least one of the first trough unit 10, the second trough unit 20, and the third trough unit 30 is shown. The junction between two adjacent trough units can be an inclined surface, thereby forming a non-linear cable trough system. As shown in Figures a and b of Figure 16 , two different bending forms are shown. During actual installation, the cable trough system can be constructed by selecting the corresponding first trough unit 10, the second trough unit 20, and the third trough unit 30 according to actual needs.

[0083] Referring to Figures 17-19, a cable trough box with adjustable trough box height is also shown, including at least one fourth trough box unit 40 in a roughly rectangular shape and a fourth lining 42. The fourth trough box unit 40 has a structure basically the same as that of the first trough box unit 10, and includes a fourth trough box 41 and a fourth locking assembly 43.

[0084] The fourth trough box 41 consists of a fourth bottom trough box 411, a fourth top trough box 412, and a pair of extended side panels 413. The structures of the fourth bottom trough box 411 and the fourth top trough box 412 are essentially the same as those of the first bottom trough box 111 and the first top trough box 112. The difference is that a pair of extended side panels 413 are further provided between the side panels directly facing the first bottom trough box 111 and the first top trough box 112. By selecting extended side panels 413 of different heights, the height of the fourth trough box 41 can be adjusted, thereby flexibly adjusting the height of the trough box according to the installation space on site. The fourth bottom trough box 411, the fourth top trough box 412 and the extended side plate 413 are fixedly connected to form a sealed whole through the fourth locking assembly 43 between the extended side plate 413 and the first bottom trough box 111, and between the extended side plate 413 and the first top trough box 112. When a short circuit explosion occurs in the cable installed in the cable trough box, the connection structure of the fourth locking assembly 43 can withstand the explosive force generated by the cable explosion, and limit the impact force, various high-temperature fragments, harmful smoke, etc. generated by the explosion to the inside of the trough box, and will not be ejected from the inside of the trough box to harm personnel and equipment, thereby improving the safety of the cable trough box system.

[0085] Because the structure of the fourth locking assembly 43 is identical to that of the first locking assembly 13, its detailed structure is not described in detail here. As will be appreciated, to match the structure of the fourth locking assembly 43, the ends of the extended side plate 413 facing the tops of the fourth bottom trough box 411 and the fourth top trough box 412 are each provided with flanges that mate with the upper and lower bosses of the fourth locking assembly 43. This ensures that the fourth bottom trough box 411, the fourth top trough box 412, and the extended side plate 413 are stably secured by the fourth locking assembly 43. This effectively prevents the fourth bottom trough box 411, the fourth top trough box 412, and the extended side plate 413 from separating in the event of a short circuit explosion of the cables within the trough box, thereby withstanding the explosive force of the explosion. The flanges on the extended side plate 413 share the same structural design as the first lower flange 1111 of the first bottom trough box 111 and the first upper flange 1121 of the first top trough box 112, so their detailed structure is not described here.

[0086] While the preferred embodiments of the present invention have been described in detail above, it should be understood that, after reading the above teachings of the present invention, those skilled in the art may make various changes or modifications to the present invention. Such equivalents also fall within the scope defined by the appended claims.

Claims

1. A cable trough box unit, characterized in that, it comprises: a bottom trough box having a bottom and two lower side walls extending from opposite sides of the bottom towards the top; a top trough box having a top and two upper side walls extending from opposite sides of the top towards the bottom; a locking assembly; wherein, the two lower side walls of the bottom trough box and the two upper side walls of the top trough box are disposed opposite to each other respectively, and the locking assembly is fixedly connected to the opposite lower side wall and upper side wall.

2. The cable trough box unit according to claim 1, characterized in that, the locking assembly includes a pair of fasteners and a locking member, the pair of fasteners includes two fastener units respectively located inside and outside the joint of the lower side wall and the upper side wall, and the locking member is fixedly connected to the two fastener units.

3. The cable trough box unit according to claim 2, characterized in that, both the lower side wall and the upper side wall include an inner flange extending to the inner side of the corresponding side wall and an outer flange extending to the outer side of the corresponding side wall, the fastener unit is provided with a lower boss portion and an upper boss portion corresponding to the inner flange or the outer flange, and the lower boss portion, the upper boss portion cooperate with the inner flange or the outer flange to limit the separation of the bottom trough box and the top trough box.

4. The cable trough box unit according to claim 3, characterized in that, the back surfaces of the inner flange and the outer flange facing the corresponding lower boss portion or upper boss portion are first inclined surfaces, and the first inclined surfaces are inclined towards the top of the lower side wall or the upper side wall connected thereto, the surfaces of the lower boss portion, the upper boss portion facing the lower boss portion or the upper boss portion are second inclined surfaces, and the second inclined surfaces are arranged substantially parallel to the first inclined surfaces.

5. The cable trough box unit according to claim 3, characterized in that, the locking member includes a screw and a nut, the rod portion of the screw passes through the two fastener units of the same pair of fasteners, and the two fastener units are locked by the nut.

6. The cable trough box unit according to claim 5, characterized in that, the locking member further includes a limit block, and the limit block is sleeved on the rod portion of the screw.

7. The cable trough box unit according to claim 6, characterized in that, the locking member further includes an elastic member, and the elastic member is sleeved on the rod portion of the screw.

8. The cable trough box unit according to claim 3, characterized in that, the fastener unit is further provided with a middle boss portion located between the upper boss portion and the lower boss portion.

9. The cable trough box unit according to claim 1, characterized in that, there is a height difference between the two lower side walls of the bottom trough box, and there is also a height difference between the two upper side walls of the top trough box.

10. The cable trough box unit according to claim 1, characterized in that, the top trough box includes a reduced-diameter section.

11. The cable trough box unit according to claim 1, characterized in that, the trough box unit further includes a support member, and the support member is fixed to the bottom trough box.

12. The cable trough box unit according to claim 11, characterized in that, On the inner sides of the two lower sidewalls of the bottom trough box, ribs are provided, and the ribs and the lower sidewalls form a trough for fixing the support member.

13. The cable trough box unit according to claim 12, characterized in that, Both ends of the bottom trough box have retracted portions where the ribs are not provided.

14. The cable trough box unit according to claim 1, characterized in that, The cable trough box unit further includes an extended side plate. An extended side plate is provided between the lower sidewall of the bottom trough box and the upper sidewall of the opposite top trough box. The locking assembly is fixedly connected to the opposite lower sidewall and the extended side plate, and the locking assembly is fixedly connected to the opposite upper sidewall and the extended side plate.

15. A cable trough box system, comprising a trough box unit and a lining. The lining is located at the joint of adjacent trough box units, and a plurality of trough box units are connected to each other through the lining, characterized in that, The trough box unit includes the cable trough box unit according to any one of claims 1 to 14 above.

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