A staggered low-voltage copper bar cable distribution box

Abstract

This utility model discloses a staggered low-voltage copper busbar cable junction box, including a box body with a door connected to the open end. Three uprights are installed vertically to the bottom of the box body, equidistantly distributed. Each upright has an insulator mounted on its top side. Each insulator is fitted with a phase copper busbar, forming an ABC three-phase copper busbar. The middle phase B busbar is straight, while phases A and C are bent. A neutral copper busbar for grounding is installed in the lower area of ​​the upright with the phase B busbar, and a grounding copper busbar for grounding is installed in the lower area of ​​the upright with the phase C busbar. The neutral and phase B busbars are staggered, as are the grounding and phase C busbars. This staggered arrangement of the copper busbars, changing from horizontal placement to vertical installation on the bottom of the box, reduces installation volume, facilitates wiring, and ultimately reduces the overall box size.

Description

Technical Field

[0001] This utility model relates to transformers, specifically to a staggered low-voltage copper busbar cable junction box. Background Technology

[0002] Cable junction boxes are used for splicing, transferring, or branching cables to distribute electrical energy from one power source to multiple load devices. They are devices used to branch, connect, and convert cable lines, offering greater flexibility and suitability for various equipment and layout requirements. Wall-mounted low-voltage copper busbar cable junction boxes are suitable for transferring or branching large-section trunk cables and are widely used in industrial and civil buildings. However, compared to ordinary junction boxes, low-voltage copper busbar cable junction boxes connect larger cross-section cables, making cable connection and bending relatively inconvenient. Their wiring operations require more workspace, resulting in a much larger size. This larger size affects their use in small electrical shafts and sometimes even necessitates occupying the installation space of other distribution boxes.

[0003] Currently, there are two common structures for low-voltage copper busbar T-junction boxes: one is the horizontal T-junction box, in which copper busbars are placed horizontally at equal intervals in a straight line according to the width of the box. The main cable is connected from the top and bottom of the copper busbar, and the branch cable is led out from the middle of the copper busbar. This box requires a relatively large width. The other is the stepped T-junction box, in which the three-phase copper busbars and the neutral and ground copper busbars are arranged in a stepped manner from top to bottom. Although this can slightly reduce the width of the box, it requires increasing the depth of the box. The increase in box depth not only affects the working space of the electrical well, but sometimes even affects the opening and closing of the box door.

[0004] Furthermore, the selection of low-voltage copper busbar specifications must ensure that the cross-section of the copper busbar can carry the required current. The larger the current, the larger the copper busbar specifications need to be. At the same time, the spacing between the copper busbars within the box is also required to prevent short circuits or other safety hazards. To meet these conditions, the space required for the copper busbars will increase accordingly, and the size of the cable distribution box will also increase, thus limiting the required installation space. Its use in small electrical shafts often brings great inconvenience and cannot meet the requirements of modern building electrical shafts.

[0005] Therefore, how to design a compact and small low-voltage copper busbar cable T-junction box that can meet the needs of connecting and branching large cables as well as the needs of installing small electrical wells is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a staggered low-voltage copper busbar cable junction box. The purpose of this cable junction box design is to reduce the box size and facilitate maintenance.

[0007] To solve the above technical problems, the present invention is implemented through the following solution: The present invention provides a staggered low-voltage copper busbar cable junction box, including a box body, the opening end of which is connected to a door, and three columns installed vertically to the bottom surface of the box body inside the box body. The three columns are equidistantly distributed, and each column has an insulator installed on its top side.

[0008] Each insulator is equipped with a phase copper busbar. The three phase copper busbars form a three-phase copper busbar ABC. The middle phase B copper busbar is a straight copper busbar, while the phase A and phase C copper busbars are bent.

[0009] Among them, the lower area of ​​the column where the B-phase copper busbar is installed has a zero-position copper busbar for connecting the neutral wire, and the lower area of ​​the column where the C-phase copper busbar is installed has a grounding copper busbar for grounding wire.

[0010] The zero-position copper busbar and the B-phase copper busbar are installed in a staggered manner;

[0011] The grounding copper busbar and the C-phase copper busbar are installed in a staggered manner.

[0012] Furthermore, the cabinet door is provided with heat dissipation holes.

[0013] Furthermore, the insulator has a slot, and the upper end of the column slides into the slot and is fixed by screws.

[0014] Furthermore, the bending angle of the A-phase copper busbar is an obtuse angle, avoiding the zero-position copper busbar in the lower region.

[0015] Furthermore, the bending angle of the C-phase copper busbar is an obtuse angle, avoiding the grounding copper busbar in the lower region.

[0016] Furthermore, the column is a U-shaped structural column.

[0017] Furthermore, all three phase copper busbars are fixed in the middle to the insulator and have holes at both ends.

[0018] Furthermore, both the upper and lower end plates of the enclosure have wire-passing holes, and cable clamps are fixed at both wire-passing holes.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. The staggered arrangement of the copper busbars in this utility model changes the original horizontal placement to vertical installation on the bottom of the enclosure, reducing the installation volume, facilitating wiring, and thus reducing the size of the enclosure. It reduces the need for large-specification copper busbars when using thick cables, and the reasonable bending of the copper busbars maintains a safe gap between them while facilitating cable connection by workers. The staggered structure fully exposes the lower zero-position and grounding copper busbars for easy maintenance.

[0021] 2. For the installation of copper busbars, slotted insulators and U-shaped posts are used. The copper busbars are installed on the insulators and the insulators are clamped on the U-shaped posts to ensure the fixation of the copper busbars and prevent short circuits caused by the copper busbars touching each other when energized due to shaking, which would affect the circuit.

[0022] 3. The installation structure of this utility model effectively reduces the size of the enclosure, meeting the installation requirements of small electrical wells. It also ensures the convenience and reliability of cable connection operations. The enclosure has high strength and good heat dissipation, and the cable connection points are subjected to only minor bending stress, ensuring reliable connections and safe and reliable power operation. Furthermore, the reduced enclosure size and copper busbar length lower costs. Attached Figure Description

[0023] Figure 1 This paper presents a comparison of the arrangement of a conventional T-junction box in the prior art with the staggered T-junction box of this utility model.

[0024] Figure 2 This is a structural diagram of the internal structure of the box body of this utility model.

[0025] Figure 3 This is an enlarged view of the installation structure of each copper busbar in this utility model.

[0026] The following are labeled in the attached diagram: 1. Heat dissipation hole; 2. Cable clamp; 3. Phase copper busbar; 4. Upper main cable; 5. Tap cable; 6. Insulator; 7. Post; 8. Lower main cable; 9. Grounding copper busbar; 10. Zero-position copper busbar. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present utility model. Obviously, the embodiments described in this utility model are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0029] Example 1: The specific structure of this utility model is as follows:

[0030] Please refer to the appendix. Figures 2-3 This utility model discloses a staggered low-voltage copper busbar cable junction box, including a box body. The box body adopts a staggered T-junction box structure. The box body has a door connected to its open end. Inside the box body, three columns 7 are installed perpendicular to the bottom surface of the box body. The three columns 7 are equidistantly distributed, and each column 7 has an insulator 6 installed on its top side. The box door has heat dissipation holes 1, which are arranged in two areas and distributed vertically.

[0031] The column 7 is a U-shaped structural column, and the column 7 is welded to the bottom surface of the box.

[0032] Each insulator 6 is equipped with a phase copper busbar 3. The three phase copper busbars 3 form an ABC three-phase copper busbar, where the middle phase B busbar is straight, while phases A and C are bent. The insulator 6 has a slot, and the upper end of the column 7 slides into this slot and is fixed with screws. Figure 3 As shown, the insulator 6 has a U-shaped groove on one side, which is snapped into the upper back side of the column 7 and fastened with screws.

[0033] The insulator 6 has a square structure, and phase copper busbars 3 are installed on its other side. The three phase copper busbars 3 are all fixed in the middle of the insulator 6 and have holes at both ends.

[0034] Among them, the upper end of each of the three phase copper busbars 3 is connected to the upper main cable 4 and the branch cable 5, and the lower end of each is connected to the lower main cable 8.

[0035] Among them, the lower area of ​​the column 7, which is equipped with the B-phase copper busbar, is equipped with a zero-position copper busbar 10 for connecting the neutral wire. Specifically, the zero-position copper busbar 10 is installed on the column 7 through an insulating component.

[0036] A grounding copper busbar 9 for grounding wire is installed in the lower area of ​​the column 7 where the C-phase copper busbar is installed. Specifically, the grounding copper busbar 9 is installed on the column 7 through an insulating component.

[0037] The zero-position copper busbar 10 and the B-phase copper busbar are installed in a staggered manner. The bending angle of the A-phase copper busbar is an obtuse angle and avoids the zero-position copper busbar 10 in the lower region, i.e., it is set in a staggered manner.

[0038] The bending angle of the C-phase copper busbar is an obtuse angle, avoiding the grounding copper busbar 9 in the lower area. That is, it is misaligned. The grounding copper busbar 9 and the C-phase copper busbar are installed in a misaligned manner.

[0039] Both the upper and lower end plates of the enclosure have wire-passing holes, and cable clamps 2 are fixed at both wire-passing holes. The cable clamps 2 are used to clamp the cables of the structure to prevent external cables from pulling on the copper busbars.

[0040] Example 2:

[0041] Specifically, this utility model aims to reduce the size of the low-voltage copper busbar cable T-junction box to meet the small-sized installation needs of modern building electrical wells, while ensuring convenient cable connection, meeting safe electrical distance requirements, ensuring reliable connection, and protecting the safe operation of the power supply.

[0042] Analyzing a low-voltage copper busbar cable T-junction box with dimensions of 500×700×200, when the copper busbars (40×6) are placed horizontally in a straight line, from... Figure 1 As can be seen, at this size, not only is it difficult to meet the electrical distance requirements of the copper busbars, but the tap lugs are also prone to contacting other copper busbars, and the installation space at their ends is very small, which cannot meet the connection requirements of large cables (based on 150 square millimeter cables). If arranged in this way, even a larger enclosure is needed to meet the electrical distance and cable installation requirements. Such a copper busbar arrangement cannot fully utilize the space in the enclosure. If we place the copper busbars vertically and stagger them back and forth, from... Figure 1 As can be seen from the last two pictures, this installation not only meets the installation requirements of the copper busbars for large cables, with sufficient electrical distance between each phase copper busbar, but also does not make the box size too large, thus meeting the requirements for use in small electrical wells and improving the space utilization rate in small electrical wells.

[0043] The core of this invention lies in changing the arrangement of copper busbars within the junction box to reduce its size. The traditional horizontal placement is changed to a vertical placement, with the vertically placed copper busbars staggered front to back. The upper copper busbars are the A, B, and C phases, while the lower ones are the neutral and ground busbars. To maintain a safe clearance between the busbars, the A and C phases are bent. This facilitates cable connections for workers, makes full use of the space within the box, and the staggered arrangement exposes the lower copper busbars for installation or maintenance. Furthermore, to ensure the stability of the copper busbars within the box, slotted square insulators and U-shaped posts are used to secure them, preventing them from swaying and coming into contact with each other, which could cause a short circuit and affect the circuit.

[0044] The copper busbars inside the enclosure are fixed in the middle and have holes at both ends to shorten their length. The lower end of each phase copper busbar 3 has a punched hole for main cable connection, while the upper end has a punched hole for main cable and branch cable connection. The main cable and branch cable are bolted to the copper busbars on both sides. Due to the vertical installation and staggered arrangement of the phase copper busbars 3, the spacing between them is large, allowing for a double-nut locking method to ensure reliable cable connections. Cable clamps 2 are installed at the cable outlet holes on the lower and upper end plates of the enclosure. One end of the cable is clamped in the cable clamp, and the other end is locked to the copper busbar with double nuts, effectively preventing potential cable movement or loosening. Furthermore, the cable clamps 2 transfer the cable's weight to the clamps and the enclosure, preventing the cable from pulling on the copper busbars.

[0045] The staggered T-junction box has ventilation holes 1 at the top and bottom of the door, forming a natural and efficient heat dissipation channel to effectively remove the temperature of the box. As the door is an opening and closing structure, the ventilation holes 1 on the door will not affect the overall structural strength of the box. The top and bottom of the box are not equipped with ventilation holes except for the cable inlet hole, which has high strength and avoids the cable's own weight pulling the box to deform it.

[0046] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A staggered low-voltage copper busbar cable junction box, comprising a box body, wherein the open end of the box body is connected to a door, characterized in that, The box is equipped with three columns (7) perpendicular to the bottom surface of the box. The three columns (7) are equidistantly distributed, and each column (7) has an insulator (6) installed on the top side. Each insulator (6) is equipped with a phase copper busbar (3). The three phase copper busbars (3) form an ABC three-phase copper busbar. The middle phase B copper busbar is a straight copper busbar, while the phase A and phase C copper busbars are bent. Among them, the column (7) with B phase copper busbar installed has a zero copper busbar (10) for connecting the neutral wire installed in the lower area, and the column (7) with C phase copper busbar installed has a grounding copper busbar (9) for grounding wire installed in the lower area. The zero-position copper busbar (10) and the B-phase copper busbar are installed in a staggered manner; The grounding copper busbar (9) and the C-phase copper busbar are installed in a staggered manner.

2. The staggered low-voltage copper busbar cable junction box according to claim 1, characterized in that, The door of the box is provided with heat dissipation holes (1).

3. The staggered low-voltage copper busbar cable junction box according to claim 1, characterized in that, The insulator (6) has a slot, and the upper end of the column (7) slides into the slot and is fixed by screws.

4. The staggered low-voltage copper busbar cable junction box according to claim 1, characterized in that, The bending angle of the A-phase copper busbar is obtuse and avoids the zero-position copper busbar in the lower region (10).

5. A staggered low-voltage copper busbar cable junction box according to claim 1, characterized in that, The bending angle of the C-phase copper busbar is obtuse and avoids the grounding copper busbar in the lower region (9).

6. A staggered low-voltage copper busbar cable junction box according to claim 1, characterized in that, The column (7) is a U-shaped structural column.

7. A staggered low-voltage copper busbar cable junction box according to claim 1, characterized in that, The three phase copper busbars (3) are all fixed in the middle to the insulator (6) and have holes at both ends.

8. A staggered low-voltage copper busbar cable junction box according to claim 1, characterized in that, Both the upper and lower end plates of the enclosure have wire-passing holes, and cable clamps (2) are fixed at both wire-passing holes.

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