Bus duct and shell thereof

Abstract

The embodiment of the utility model provides a bus duct and a shell thereof. The shell of the bus duct comprises a first shell which comprises a first top plate and a first bottom plate which are opposite to each other; the first side plate and the second side plate are opposite to each other; the partition plates are respectively connected with the first top plate and the first bottom plate and are arranged at intervals in the direction from the first side plate to the second side plate, the partition plates divide the inner cavity of the first shell into a plurality of mounting cavities for accommodating a plurality of conductors, the first bottom plate is provided with a plurality of openings, and the mounting cavities are communicated with the outside through the openings; the second shell is located on the outer side of the first shell and at least comprises a second top plate and a third side plate which are connected, the second top plate is connected with the first top plate through at least one first rib plate, and the third side plate is connected with one of the first side plate and the second side plate through at least one second rib plate. The shell of the bus duct provided by the embodiment of the utility model has relatively good rigidity and structural strength.

Description

Technical Field

[0001] The embodiments disclosed herein relate generally to the field of electrical equipment technology, and more particularly to a busbar trunking and its housing. Background Technology

[0002] Busbar trunking is a high-current power transmission facility widely used in electrical equipment and power systems in civil buildings, factories, etc. Busbar trunking consists of a housing and conductor groups. Each conductor group comprises multiple conductors, and multiple mounting cavities are formed within the housing, with each conductor installed in a corresponding cavity. The conductors forming the current loop are insulated from the housing. Busbar trunking in a three-phase four-wire power supply system includes four mounting cavities and four conductors: phases A, B, and C (phase lines) and the neutral line N (neutral line), with phases A, B, and C located on one side of the N line. Busbar trunking in a three-phase five-wire power supply system, compared to that in a three-phase four-wire system, adds one mounting cavity within the housing and an additional PE (protective earth) conductor as the grounding wire, located on the other side of the N line. Utility Model Content

[0003] In a first aspect of this disclosure, a busbar trunking housing is provided, comprising: a first housing including: a first top plate and a first bottom plate opposite to each other; a first side plate and a second side plate opposite to each other; and a plurality of partitions connected to the first top plate and the first bottom plate respectively and spaced apart in a direction from the first side plate to the second side plate, the plurality of partitions dividing the inner cavity of the first housing into a plurality of mounting cavities for accommodating a plurality of conductors, wherein the first bottom plate is provided with a plurality of openings, and the plurality of mounting cavities communicate with the outside through the plurality of openings; and a second housing located outside the first housing and including at least a second top plate and a third side plate connected together, the second top plate being connected to the first top plate by at least one first stiffener, and the third side plate being connected to one of the first side plate and the second side plate by at least one second stiffener.

[0004] In some embodiments, the third side plate is connected to the first side plate by at least one second stiffener, and the connection between the first top plate and the first side plate is connected to the connection between the second top plate and the third side plate by the third stiffener.

[0005] In some embodiments, the plurality of mounting cavities include three phase line mounting cavities and one neutral line mounting cavity arranged sequentially from the first side plate to the second side plate, and the third side plate is connected to the first side plate by at least one second stiffener.

[0006] In some embodiments, the second top plate is connected to the first top plate by a plurality of first stiffeners, the plurality of first stiffeners being arranged at intervals between each other; and / or the third side plate is connected to the first side plate by a plurality of second stiffeners, the plurality of second stiffeners being arranged at intervals between each other.

[0007] In some embodiments, the plurality of mounting cavities further include a grounding mounting cavity located on the side of the neutral mounting cavity opposite to the three phase mounting cavities; and / or a first base plate extends from a first side plate to a third side plate, and the upper edge of the second side plate extends upward to connect with the side edge of the second top plate near the second side plate.

[0008] In some embodiments, the housing is provided with mounting holes for connection to a busbar connector via fasteners.

[0009] In some embodiments, the bottom of the housing is provided with snap-fit ​​portions on both sides, the snap-fit ​​portions protruding downward relative to the first base plate to be detachably connected with the sealing plate, and wherein the bottom surface of the snap-fit ​​portion is provided with mounting holes.

[0010] In some embodiments, the third side plate is adjacent to the first side plate, a first support platform is formed at the bottom of the third side plate, and a second support platform is formed at the bottom of the second side plate; and / or a third bent plate is provided on both the second side plate and the third side plate, a first receiving groove is formed between the second side plate and the corresponding third bent plate, and a second receiving groove is formed between the third side plate and the corresponding third bent plate.

[0011] In some embodiments, the housing is an aluminum housing.

[0012] In a second aspect of this disclosure, a busbar trunking is provided, including a housing of the busbar trunking according to a first aspect of this disclosure.

[0013] According to the embodiments of the present disclosure, a second housing is added to the first housing. The second housing is connected to the first housing through stiffeners, which can effectively enhance the rigidity and structural strength of the first housing. This is beneficial to improving the bus trunking's ability to withstand short-circuit current and its service life.

[0014] It should be understood that the content described in this section is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0015] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0016] Figure 1 A cross-sectional view of a busbar trunking according to an embodiment of the present disclosure is shown; and

[0017] Figure 2A cross-sectional view of a busbar trunking and a busbar trunking connector connected to the busbar trunking is shown according to another embodiment of the present disclosure. Detailed Implementation

[0018] Preferred embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0019] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects.

[0020] In a three-phase four-wire or three-phase five-wire power supply system, the three phase conductors (A, B, and C phases) of a busbar trunking are arranged side-by-side on one side of the neutral conductor (N phase). To ensure good heat dissipation and a lightweight design, conventional busbar trunking uses a single-layer aluminum casing. When a fault occurs in the transmission line connected to the busbar trunking, the short-circuit current flows through the line to the busbar trunking. When the busbar trunking experiences a short-circuit current, due to the electrical connection between the three phase conductors, the short-circuit current is redistributed among the phase conductors, causing each phase conductor to experience the short-circuit current. Furthermore, because the short-circuit current experienced by the busbar trunking far exceeds the normal operating current, this large short-circuit current generates significant electrodynamic forces between the current-carrying conductors within the busbar trunking, which are then transmitted to the busbar trunking casing, potentially causing casing deformation. Severe casing deformation will affect the normal operation of the busbar trunking, reducing its electrical performance and reliability.

[0021] To address the aforementioned problems, embodiments of this disclosure provide a busbar trunking 100 and its housing. Even when made of aluminum, the housing exhibits high rigidity and structural strength, preventing excessive deformation of the busbar trunking 100 housing while it can withstand large short-circuit currents. This improves the busbar trunking 100's ability to withstand short-circuit currents, enhances its electrical performance and reliability, and extends its service life. In the following sections, [further details will be provided]. Figure 1 and Figure 2 The principle of the busbar trunking 100 and its housing provided in the embodiments of this disclosure is described.

[0022] Figure 1A cross-sectional view of the housing of a busbar 100 according to an embodiment of the present disclosure is shown. Figure 2 A cross-sectional view of a busbar 100 and a busbar connector 200 connected to the busbar 100 is shown according to another embodiment of the present disclosure. Figure 1 and Figure 2 The housing of the busbar trunking 100 shown is suitable for use in a three-phase five-wire power supply system. Unless otherwise specified, Figure 1 and Figure 2 The housing structure of the busbar trunking 100 is largely the same. Figure 1 The housing structure of the busbar trunking 100 shown and Figure 2 The busbar trunking 100 shown has a generally similar housing structure; the differences between the two will be explained below. Figure 2 The multiple conductors 40 in the busbar 100 shown are also suitable for applications with Figure 1 The busbar trunking 100 shown is located in the busbar trunking of the housing.

[0023] See Figure 1 and Figure 2 The busbar trunking 100 has a housing comprising a first housing 10 and a second housing 20. The first housing 10 includes a first top plate 11, a first bottom plate 12, a first side plate 13 and a second side plate 14, and a plurality of partitions 15. The first top plate 11 and the first bottom plate 12 are opposite to each other, and the first side plate 13 and the second side plate 14 are opposite to each other. The first top plate 11, the first bottom plate 12, the first side plate 13, and the second side plate 14 define the inner cavity of the first housing 10. Each partition 15 is connected to the first top plate 11 and the first bottom plate 12, and the plurality of partitions 15 are spaced apart along the direction from the first side plate 13 to the second side plate 14. The plurality of partitions 15 divide the inner cavity of the first housing 10 into a plurality of mounting cavities for accommodating a plurality of conductors 40.

[0024] The multiple conductors 40 consist of three phase conductors (specifically, phase A 41, phase B 42, and phase C 43), one neutral conductor (N conductor 44), and one grounding conductor (PE conductor 45). The multiple conductors 40 are arranged side-by-side, with the three phase conductors located on one side of the N conductor 44 and the PE conductor 45 located on the other side. Correspondingly, the multiple mounting cavities include three phase mounting cavities 101, one neutral mounting cavity 102, and one grounding mounting cavity 103, arranged sequentially from the first side plate 13 to the second side plate 14. Phase A 41, phase B 42, and phase C 43 are respectively installed in the three phase mounting cavities 101, the N conductor 44 is installed in the neutral mounting cavity 102, and the PE conductor 45 is installed in the grounding mounting cavity 103. Phase A 41 is adjacent to the first side plate 13, and the PE conductor 45 is adjacent to the second side plate 14.

[0025] When the busbar trunking 100 is working, current will flow through the A-phase conductor 41, B-phase conductor 42, C-phase conductor 43 and N-phase conductor 44. Therefore, the A-phase conductor 41, B-phase conductor 42, C-phase conductor 43 and N-phase conductor 44 can be collectively referred to as current-carrying conductors.

[0026] Reference Figure 1 and Figure 2 Each of the three mounting cavities 101 and 102, which are used to accommodate the current-carrying conductor, is provided with an insulating element 50. The insulating element 50 is used to insulate and isolate the corresponding current-carrying conductor from the housing. The insulating element 50 can be an insulating coating or an insulating plastic part. The PE conductor 45 is in direct contact with the first housing 10 in the grounding wire mounting cavity 103, realizing the grounding of the first housing 10. The first base plate 12 is provided with multiple openings 120, and each mounting cavity communicates with the outside through the corresponding opening 120, so that power receiving equipment (such as a plug-in box) can be inserted into each mounting cavity to connect with the corresponding conductor 40.

[0027] In some embodiments, each insulating element 50 has a flared structure extending from a corresponding opening 120. This flared structure helps to ensure creepage distance between different current-carrying conductors and helps to guide the pins of the power-collecting device into their respective mounting cavities to connect with the corresponding current-carrying conductors. In some embodiments, the first base plate 12 may have a flared structure directly formed at the opening 120 of the grounding wire mounting cavity 103 to guide the corresponding pins of the power-collecting device into the grounding wire mounting cavity 103 to connect with the PE conductor 45.

[0028] When the busbar 100 is subjected to a short-circuit current, the electrodynamic force between phase A line 41 and phase B line 42 has a greater impact on the first housing 10, making the side of the first top plate 11 adjacent to the first side plate 13 more prone to upward bending deformation.

[0029] See Figure 1 The second shell 20 is located outside the first shell 10 and includes at least a connected second top plate 21 and a third side plate 22. The second top plate 21 is located above the first top plate 11, and the third side plate 22 is adjacent to one of the first side plate 13 and the second side plate 14. The second shell 20 is connected to the first shell 10 by stiffening plates to enhance the rigidity and structural strength of the first shell 10 and improve its resistance to deformation.

[0030] As can be seen from the above, the side of the first top plate 11 adjacent to the first side plate 13 is more prone to upward bending deformation, and the third side plate 22 can be specifically adjacent to the first side plate 13. The second top plate 21 is connected to the first top plate 11 through at least one first stiffener 23, and the third side plate 22 is connected to the first side plate 13 through at least one second stiffener 24.

[0031] According to an embodiment of the present disclosure, the busbar trunking 100 has a second housing 20 added to the first housing 10. The second housing 20 is connected to the first top plate 11 and the first side plate 13 of the first housing 10 via stiffening ribs, which effectively enhances the rigidity and structural strength of the first housing 10, especially the rigidity and structural strength of the easily deformable areas of the first top plate 11. Thus, even if the housing is made of aluminum, when the busbar trunking 100 is subjected to a large short-circuit current, the double-layered hollow shape of the first housing 10 and the second housing 20 ensures good rigidity and structural strength, preventing excessive local deformation of the housing. This improves the short-circuit current withstand capability and service life of the busbar trunking 100.

[0032] Compared to increasing the rigidity of the first housing 10 by increasing the wall thickness of the first top plate 11 and the first side plate 13, the housing in this embodiment has a lighter weight and lower material cost due to its double-layer hollow shape. Furthermore, the housing in this embodiment has a larger heat dissipation area, allowing heat from each current-carrying conductor to be discharged through the first housing 10, the first stiffener 23, the second stiffener 24, and the second housing 20, which helps improve the heat dissipation performance of the busbar trunking 100.

[0033] See Figure 1 and Figure 2 The number of first stiffeners 23 and second stiffeners 24 is, for example, not less than two. In some embodiments, the second top plate 21 is connected to the first top plate 11 by a plurality of first stiffeners 23, which are arranged at intervals. The plurality of first stiffeners 23 can be evenly spaced between the first top plate 11 and the second top plate 21 or unevenly spaced as needed. In this embodiment, each first stiffener 23 is in the shape of a straight plate; in some alternative embodiments, each first stiffener 23 may have other suitable shapes as needed. Each first stiffener 23 has a certain area and thickness. It is understood that the shape and size of any two first stiffeners 23 may be the same or different.

[0034] In some embodiments, the third side plate 22 is connected to the first side plate 13 by a plurality of second stiffeners 24, which are arranged at intervals. The plurality of second stiffeners 24 can be evenly spaced between the third side plate 22 and the first side plate 13, or they can be unevenly spaced as needed. Each second stiffener 24 can be a straight plate or other suitable shape. Each second stiffener 24 has a certain area and thickness; it is understood that any two second stiffeners 24 can have the same or different shapes and dimensions.

[0035] By designing the shape, size, and connection position of each first stiffener 23 and each second stiffener 24, the rigidity and structural strength of the entire shell (especially the easily deformable area of ​​the first shell 10) can be significantly enhanced while controlling the weight of the entire shell and meeting other functional requirements.

[0036] In some embodiments, the connection between the second top plate 21 and the third side plate 22 may form a sloped structure 281. In some embodiments, the connection between the second top plate 21 and the third side plate 22 may form an arc structure, a right-angle structure, or other suitable structure. The connection between the second top plate 21 and the third side plate 22 is connected to the connection between the first top plate 11 and the first side plate 13 by a third stiffener 245, which can enhance the rigidity and structural strength of the deformable area of ​​the entire shell.

[0037] In some embodiments, the first base plate 12 extends from the first side plate 13 to the third side plate 22, further connecting the first base plate 12 and the third side plate 22 together. The upper edge of the second side plate 14 extends upward to connect with the side edge of the second top plate 21 near the second side plate 14, further connecting the second side plate 14 and the second top plate 21 together. This further enhances the rigidity and structural strength of the shell. In some embodiments, the upper edge of the second side plate 14 and the second top plate 21 can be directly connected and can form a right angle. In some embodiments, the connection between the upper edge of the second side plate 14 and the side edge of the second top plate 21 can form a beveled structure 282, an arc structure, a right angle structure, or other suitable structure.

[0038] See Figure 1 and Figure 2 In some embodiments, the busbar 100 may further include a sealing plate 30. The bottom sides of the housing of the busbar 100 are respectively provided with snap-fit ​​portions 16, which protrude downwards relative to the first base plate 12 and are used for detachable connection with the sealing plate 30. In some embodiments, the two snap-fit ​​portions 16 are obtained by extending downwards from both sides of the first base plate 12. In some embodiments, the two snap-fit ​​portions 16 can be obtained by extending downwards directly from the third side plate 22 and the second side plate 14. For busbars 100 that do not need to be connected to power-generating equipment, the sealing plate 30 can isolate the conductors 40 from the outside environment. For busbars 100 that need to be connected to power-generating equipment, the sealing plate 30 can be removed from the busbar 100 to allow the pins of the power-generating equipment to connect to the conductors 40.

[0039] Reference Figure 1 and Figure 2In some embodiments, a first support platform 251 is formed at the bottom of the third side plate 22, and a second support platform 261 is formed at the bottom of the second side plate 14. For example, the third side plate 22 can be connected to the bottom surface of the adjacent snap-fit ​​portion 16 via a first bending plate 25, on which the first support platform 251 is formed. The second side plate 14 can be connected to the bottom surface of the adjacent snap-fit ​​portion 16 via a second bending plate 26, on which the second bending plate 26 is formed. The first support platform 251 and the second support platform 261 are used to engage with the hook of the power receiving equipment to allow the power receiving equipment to be suspended below the busbar 100.

[0040] See Figure 2 In some embodiments, when the busbar 100 and the busbar connector 200 are connected, the snap-fit ​​portion 16 is supported by the support portion of the busbar connector 200. The first bending plate 25 and the second bending plate 26 enhance the rigidity of each snap-fit ​​portion 16.

[0041] See also Figure 2 In some embodiments, the bottom surface of the snap-fit ​​portion 16 may also be provided with a mounting hole 160, which is located near the end of the busbar 100. When the end of the busbar 100 is connected to the busbar connector 200, the end of the busbar 100 can be inserted into the busbar connector 200. The housing of the busbar connector 200 has a hole 201 located below the mounting hole 160. Fasteners (e.g., screws, not shown) pass through the hole 201 and connect to the mounting hole 160. This helps to improve the connection strength and overall rigidity of the busbar 100 and the busbar connector 200, as well as improve the stress distribution between the busbar 100 and the busbar connector 200. In some alternative embodiments, the mounting hole 160 may be provided at any suitable location on the housing of the busbar to connect to the busbar connector 200 by means of fasteners, thereby improving the connection strength and overall rigidity, as well as the stress distribution.

[0042] See Figure 1 and Figure 2 In some embodiments, both the second side plate 14 and the third side plate 22 are provided with a third bending plate 27. A first receiving groove 271 is formed between the second side plate 14 and the corresponding third bending plate 27, and a second receiving groove 272 is formed between the third side plate 22 and the corresponding third bending plate 27. The first receiving groove 271 and the second receiving groove 272 can accommodate cables (e.g., temperature measuring cables) outside the busbar trough.

[0043] In some embodiments, a pair of bent plates 29 are provided on the second top plate 21. The pair of bent plates 29 can accommodate the connecting plate 60. The busbar can be connected to the hanging mechanism or to the busbar connector 200 by screws through the connecting plate 60.

[0044] It should be noted that, although the above embodiments are described using a three-phase five-wire busbar trunking 100 as an example, in some alternative embodiments, a housing configured with a first housing 10 and a second housing 20 can also be applied to a three-phase four-wire busbar trunking. For housings applied to three-phase four-wire busbar trunkings, since the busbar trunking does not have a PE conductor, the mounting cavity for installing the PE conductor is omitted from the housing accordingly, and the N conductor 44 is adjacent to the second side plate 14.

[0045] In addition, in some embodiments not shown, the second housing 20 may also include a fourth side plate adjacent to the second side plate 14. The fourth side plate may be connected to the second side plate 14 by one or more fourth stiffeners to further enhance the rigidity and structural strength of the housing.

[0046] The housing of the busbar trunking according to an embodiment of the present disclosure can be integrally formed by an extrusion process.

[0047] According to the embodiments of the present disclosure, by providing a second shell outside the first shell, the second shell covers the easily deformable area of ​​the first shell and is connected to the first shell by stiffeners, which can effectively improve the rigidity and structural strength of the easily deformable area of ​​the busbar trunking shell and prevent excessive local deformation of the shell. This is beneficial to improving the busbar trunking 100's ability to withstand short-circuit currents and its service life.

[0048] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A housing for a busbar trunking system, characterized in that, include: The first housing (10) includes: The first top plate (11) and the first bottom plate (12) are opposite to each other; The first side plate (13) and the second side plate (14) facing each other; and Multiple partitions (15) are connected to the first top plate (11) and the first bottom plate (12) respectively and are spaced apart along the direction from the first side plate (13) to the second side plate (14). The multiple partitions (15) divide the inner cavity of the first housing (10) into multiple mounting cavities for accommodating multiple conductors (40). The first base plate (12) is provided with multiple openings (120), and the multiple mounting cavities are connected to the outside through the multiple openings (120); The second housing (20) is located outside the first housing (10) and includes at least a connected second top plate (21) and a third side plate (22), the second top plate (21) being connected to the first top plate (11) by at least one first stiffener (23), and the third side plate (22) being connected to one of the first side plate (13) and the second side plate (14) by at least one second stiffener (24).

2. The housing according to claim 1, characterized in that, The third side plate (22) is connected to the first side plate (13) via at least one second stiffener (24), and The connection between the first top plate (11) and the first side plate (13) and the connection between the second top plate (21) and the third side plate (22) are connected by a third stiffening plate (245).

3. The housing according to claim 1, characterized in that, The plurality of mounting cavities include three phase line mounting cavities (101) and one neutral line mounting cavity (102) arranged sequentially from the first side plate (13) to the second side plate (14), and the third side plate (22) is connected to the first side plate (13) through at least one second stiffener (24).

4. The housing according to claim 3, characterized in that, The second top plate (21) is connected to the first top plate (11) by a plurality of first stiffening plates (23), the plurality of first stiffening plates (23) being arranged at intervals from each other; and / or The third side plate (22) is connected to the first side plate (13) by a plurality of second stiffeners (24), and the plurality of second stiffeners (24) are arranged at intervals from each other.

5. The housing according to claim 3, characterized in that, The plurality of mounting cavities also includes a grounding mounting cavity (103), which is located on the side of the neutral mounting cavity (102) opposite to the three phase mounting cavities (101); and / or The first bottom plate (12) extends from the first side plate (13) to the third side plate (22), and the upper edge of the second side plate (14) extends upward to connect with the side edge of the second top plate (21) near the second side plate (14).

6. The housing according to any one of claims 1 to 5, characterized in that, The housing is provided with a mounting hole (160) for connection with a busbar connector (200) via fasteners.

7. The housing according to claim 6, characterized in that, The bottom of the housing is provided with snap-fit ​​parts (16) on both sides, the snap-fit ​​parts (16) protruding downward relative to the first bottom plate (12) so as to be detachably connected with the sealing plate (30), and The bottom surface of the snap-fit ​​part (16) is provided with the mounting hole (160).

8. The housing according to any one of claims 1 to 5, characterized in that, The third side plate (22) is adjacent to the first side plate (13). The bottom of the third side plate (22) has a first support platform (251), and the bottom of the second side plate (14) has a second support platform (261); and / or Both the second side plate (14) and the third side plate (22) are provided with a third bending plate (27). A first receiving groove (271) is formed between the second side plate (14) and the corresponding third bending plate (27), and a second receiving groove (272) is formed between the third side plate (22) and the corresponding third bending plate (27).

9. The housing according to any one of claims 1 to 5, characterized in that, The casing is made of aluminum.

10. A busbar trunking system (100), characterized in that, The housing of the busbar trunking as described in any one of claims 1 to 9.

Images