Fabricated cable duct bank for increasing current-carrying capacity of cable

Abstract

The utility model relates to the technical field of power equipment, and discloses an assembly type cable duct bank for increasing the current-carrying capacity of a cable, which comprises a plurality of cable duct bank units which are coupled and spliced, the center of the cross section of each cable duct bank unit is provided with a hollow heat dissipation hole, and a plurality of cable holes are uniformly distributed outside the heat dissipation hole; the tongue-and-groove side of the cable duct bank unit is provided with a horn mouth, and the other side of the cable duct bank unit penetrates into the horn mouth to be coupled and spliced; the top of the cable duct bank unit is provided with a hanging nail and a grounding steel plate. By adopting the hollow structure, the contact surface between the interior of the calandria and the air is increased, the heat dissipation is fast, and the current-carrying capacity of the cable is improved.

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, and in particular to an assembled cable duct that increases the current carrying capacity of cables. Background Technology

[0002] Power cables are used for transmitting and distributing electrical energy. They are commonly used in urban underground power grids, power plant lead-out lines, internal power supply in industrial and mining enterprises, and underwater transmission lines across rivers and seas. The proportion of cables in power lines is gradually increasing. However, traditional cable ducts suffer from poor heat dissipation and low current carrying capacity. This is mainly due to the heat generated by the clustered cables within the duct, leading to heat accumulation that cannot be quickly transferred or dissipated. Simultaneously, high air temperature and high thermal resistance cause the cable conductor temperature to rise, further reducing the cable's current carrying capacity and severely impacting the power transmission capacity of the cables (especially the current carrying capacity of cables within the central conduit hole). Furthermore, traditional cable ducts are cast-in-place structures, resulting in low construction efficiency. Project quality depends entirely on the construction team and cannot be effectively controlled. Workers experience high labor intensity, and the long-term occupation of public space not only affects municipal traffic and pedestrian safety but also generates significant construction waste and dust, making it a major source of particulate pollution in cities.

[0003] Traditional cable ducts have the following drawbacks:

[0004] 1. Traditional cable groups in conduits tend to accumulate heat, have poor heat dissipation performance, and low current carrying capacity.

[0005] 2. Traditional pipe laying construction is inefficient, affects municipal traffic, and causes significant pollution.

[0006] 3. The quality of traditional pipe laying projects cannot be effectively controlled, and the labor intensity of workers is high.

[0007] Existing technology 1

[0008] A Chinese patent with publication number CN218216446U discloses a novel high-pressure-resistant and wear-resistant MPP power conduit to solve problems such as the internal structural stability of power conduits. It includes an inner tube body, with an outer tube body fitted around it. An I-shaped support rib is provided between the inner and outer tube bodies. The lower end of the support rib is fixed to the inner tube body via a limiting mechanism, and the upper end is slidably connected to the outer tube body via a plug-in mechanism. Several support plates are provided between the inner and outer tube bodies, and the support plates are fixedly connected to the support ribs via a locking mechanism. It has advantages such as good structural stability and resistance to misalignment and separation of the tube body.

[0009] The technical drawback of the existing technology is that the product is assembled by splicing parts together, which makes the assembly process more complicated and results in higher overall construction costs.

[0010] Existing technology 2

[0011] A Chinese patent with publication number CN116207693A provides a cable conduit that is beneficial to improving the current carrying capacity of cables. The conduit includes a protective shell, and a plurality of pipe supports are provided inside the protective shell. Each pipe support is provided with a plurality of wire-passing holes and a plurality of ventilation holes. Each wire-passing hole and each ventilation hole is independent of each other. A cable conduit is passed through each wire-passing hole. A first connecting component and a second connecting component are respectively inserted at both ends of the cable conduit. Adjacent cable conduits are connected by the first connecting component and the second connecting component that are inserted into each other.

[0012] The technical drawback of the prior art is that it forms numerous heat dissipation cavities between the cable conduits through mutually separated wire holes. However, the heat dissipation effect of the cable conduit in the middle is not as fast as that of the cable conduit at the edges, and the problem of poor heat dissipation still exists; the heat dissipation problem in the middle is not solved. Summary of the Invention

[0013] In order to overcome or alleviate one or more of the above technical problems, the purpose of this utility model is to provide an assembled cable duct that increases the current carrying capacity of cables.

[0014] This utility model provides the following technical solution:

[0015] An assembled cable duct for increasing cable current carrying capacity includes multiple coupled cable duct units. Each cable duct unit has a hollowed-out heat dissipation hole at the center of its cross-section, and several cable holes are evenly distributed outside the heat dissipation hole. The cable duct unit has a flared mouth on its tongue-and-groove side, and the other side is inserted into the flared mouth for coupling and splicing. The top of the cable duct unit is provided with a hanging nail and a grounding steel plate.

[0016] According to some implementation methods, the flared end of the cable conduit unit is provided with a through hole, and the other side of the coupling is provided with a corresponding mounting hole, and bolts are inserted into the through hole and mounting hole on the flared end for fixing.

[0017] According to some implementation methods, the cable duct unit is prefabricated using steel mesh and concrete, and the grounding steel plate is connected to the steel mesh.

[0018] According to some embodiments, the tongue and groove side edge of the cable duct unit is provided with an annular waterproof groove for placing a waterproof adhesive strip.

[0019] According to some embodiments, a single cable conduit unit is cylindrical or a regular polygon in shape; the heat dissipation holes are circular or regular polygons.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. This utility model adopts a hollow structure in the middle, which increases the contact surface between the inside of the pipe and the air, resulting in fast heat dissipation and improved cable current carrying capacity.

[0022] 2. This utility model is a prefabricated cable duct, which is prefabricated in the factory and then transported to the site for installation, which greatly saves the construction period, reduces pollution, and has little impact on municipal traffic.

[0023] 3. The cable duct unit of this utility model is pre-produced in the factory. Through assembly line operation and quality inspection, the quality can be better controlled, and the labor intensity of workers on the construction site can be reduced. Attached Figure Description

[0024] Figure 1 A schematic diagram of an assembled cable duct for increasing cable current carrying capacity provided for an embodiment of this utility model.

[0025] Figure 2 for Figure 1 Side sectional view.

[0026] Figure 3 This is a schematic diagram showing a cable duct installed below ground level, as provided in an embodiment of the present invention.

[0027] Figure 4 A schematic diagram of an assembled cable duct with nine cable holes for increasing cable current carrying capacity, provided for an embodiment of this utility model.

[0028] Figure 5 A schematic diagram of an assembled cable duct with 12 cable holes for increasing cable current carrying capacity, provided for an embodiment of this utility model.

[0029] In the picture:

[0030] 1. Heat dissipation hole; 2. Cable hole; 3. Square hole; 4. Round hole; 5. Hanging nail; 6. Grounding steel plate. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the embodiments and accompanying drawings. However, it should be understood that the embodiments and accompanying drawings are for illustrative purposes only and do not constitute any limitation on the scope of protection of the present invention. All reasonable modifications and combinations that fall within the inventive spirit of the present invention are within the scope of protection of the present invention.

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," and "rear," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0033] The present invention will be further described below with reference to the accompanying drawings.

[0034] Example 1

[0035] like Figure 1 As shown, this embodiment provides an assembled cable duct for increasing cable current carrying capacity, hereinafter referred to as cable duct. The cable duct comprises multiple spliced ​​cable duct units. Each individual cable duct unit is cylindrical with a circular cross-section. A central, hollowed-out circular heat dissipation hole 1 is located at the center, and six cable holes 6 are evenly distributed around the heat dissipation hole 1. The circular cross-section differs from the solid rectangular cross-section of traditional cable ducts. The cable holes 6 are evenly arranged around the circular ring. The cable holes 6 can be designed according to the designed cable size and capacity, such as... Figure 4 or Figure 5 There are 9 and 12 respectively.

[0036] The heat dissipation hole 1 at the center of the ring has a hollow design to allow for the flow of hot air, and it is not filled with concrete or other materials.

[0037] The cable is laid within cable holes 2 arranged on the circular ring. Temperature no longer accumulates in the central hollow area of ​​the cable cluster. Through these changes in structure and arrangement, the cable's current carrying capacity is increased. For example... Figure 3 This is a schematic diagram of one embodiment fixed below ground level.

[0038] Interface Design: The cable duct units are manufactured using prefabricated standard components. One end features a flared opening, and the other end has a corresponding snap-fit ​​interface. This allows for easy assembly by connecting the different flared ends. Even if production or installation errors cause local misalignment during cable duct installation (misalignment ≤5mm is considered compliant with specifications), it will not affect cable laying. The cable ducts are prefabricated in the factory and then transported to the site for installation, significantly saving construction time, minimizing pollution, and reducing impact on municipal traffic.

[0039] Waterproof design: The tongue and groove side of the standard cable duct component is provided with an annular waterproof groove, and the position of the annular waterproof strip is reserved. After the prefabricated cable duct component is transported to the site, the annular waterproof strip is installed first, and then the assembly is carried out.

[0040] Connection Design: The rear end of the standard cable duct component is tongue and grooved, while the front remains unchanged. This makes alignment easier when assembling adjacent cable duct units. Additionally, a rectangular hole 3 is provided on the tongue and groove side of the prefabricated cable duct component, and a round hole 4 is provided on the other side for positioning: After installing the first cable duct unit, a bolt is inserted into the pre-drilled round hole in the second cable duct unit. The position of the prefabricated cable duct component is then adjusted so that the bolt engages with the rectangular hole in the first prefabricated cable duct component. At this point, the two prefabricated cable duct components are aligned.

[0041] Lifting design: The cable duct unit is equipped with 5 round-headed lifting nails, which are used in conjunction with duckbill hook lifting tools during lifting.

[0042] Grounding design: The top of the cable duct unit has a pre-embedded arc-shaped grounding steel plate 6. The steel plate is connected to the steel mesh of the prefabricated cable duct standard parts to facilitate grounding after assembly.

[0043] Installation steps:

[0044] During installation, first hoist a cable duct unit to the designated position, then install the waterproof sealant at the tongue and groove of the first cable duct unit, insert bolts into the pre-drilled round holes of the second cable duct unit, and then adjust the position of the prefabricated cable duct standard parts so that the bolts are inserted into the strip-shaped square holes of the first cable duct unit. At this point, the installation is complete.

[0045] Example 2

[0046] In other embodiments, a single cable conduit unit may also be polygonal in shape, such as having a square outer surface and square, circular, or polygonal heat dissipation holes or cable holes in the middle. However, a circular cross-section of the cable conduit unit is more conducive to heat dissipation from the central heat dissipation holes.

[0047] The above embodiments are merely preferred embodiments of this utility model, and the protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that improvements and modifications made by those skilled in the art without departing from the principle of this invention should also be considered within the protection scope of this utility model.

Claims

1. A prefabricated cable duct for increasing cable current carrying capacity, characterized in that: It includes multiple coupled cable duct units. Each cable duct unit has a hollowed-out heat dissipation hole at the center of its cross-section, and several cable holes are evenly distributed outside the heat dissipation hole. The cable duct unit has a flared mouth on the tongue and groove side, and the other side is inserted into the flared mouth for coupling and splicing. The top of the cable duct unit is provided with a hanging nail and a grounding steel plate.

2. The assembled cable duct for increasing cable current carrying capacity according to claim 1, characterized in that: The cable duct unit has a through hole on the flared end and a corresponding mounting hole on the other side of the coupling. Bolts are inserted into the through hole and the mounting hole on the flared end for fixing.

3. The assembled cable duct for increasing cable current carrying capacity according to claim 2, characterized in that: The cable duct unit is prefabricated using steel mesh and concrete, and the grounding steel plate is connected to the steel mesh.

4. The assembled cable duct for increasing cable current carrying capacity according to claim 3, characterized in that: The tongue and groove side edge of the cable duct unit is provided with an annular waterproof groove for placing waterproof adhesive strips.

5. The assembled cable duct for increasing cable current carrying capacity according to any one of claims 1 to 4, characterized in that: Each cable conduit unit is cylindrical or polygonal in shape; the heat dissipation holes are circular or polygonal.

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