Coaxial DC bus

Abstract

The utility model relates to a coaxial direct-current bus, which comprises a conductor part, an insulating support and a bracket, the conductor portion includes a first conductor, a second conductor, and an inter-electrode support. The cross sections of the first conductor and the second conductor are annular. The first conductor and the second conductor are coaxially arranged, and the first conductor is located in the second conductor. The first conductor and the second conductor are any one of a positive electrode conductor and a negative electrode conductor and are different from each other. The interelectrode support is located between the first conductor and the second conductor. The inner surface of the inter-electrode support abuts against the outer surface of the first conductor, and the outer surface of the inter-electrode support abuts against the inner surface of the second conductor. The insulating support is arranged on the support, and an accommodating space for accommodating the conductor part is formed in the insulating support. The conductor part is arranged in the accommodating space, and the outer wall of the second conductor abuts against the inner wall of the accommodating space. According to the utility model, the occupied area of the direct-current bus is reduced, and the adverse effect of electrodynamic force on the service life of the direct-current bus is weakened.

Description

Technical Field

[0001] The utility model relates to the technical field, in particular to a coaxial DC bus. Background Art

[0002] The DC bus refers to the DC power supply in the AC input circuit. It is isolated from the AC system so that the AC power does not affect the DC power. The DC bus can be used between the AC and DC systems, and between the AC power supply and the DC power supply.

[0003] In the prior art, a common structure of a DC bus is that two-pole conductors are arranged in parallel, and insulating parts are used to support and fix the conductors to ensure a safe insulation distance between conductors of different poles and between the conductors and other parts.

[0004] There is electromotive force between the positive conductor and the negative conductor arranged in the above manner, which causes the positive conductor and the negative conductor to repel each other, which is not conducive to the stable operation of the DC bus and occupies a large area. Utility Model Content

[0005] In order to avoid the influence of electromotive force between the positive conductor and the negative conductor and reduce the floor space of the DC bus, the utility model provides a coaxial DC bus.

[0006] The utility model provides the following technical solutions:

[0007] A coaxial DC busbar comprises a conductor portion, an insulating support and a bracket; wherein the conductor portion comprises a first conductor, a second conductor and an inter-pole support; the cross-sections of the first conductor and the second conductor are both annular; the first conductor and the second conductor are coaxially arranged, and the first conductor is located inside the second conductor; the first conductor and the second conductor are either a positive conductor or a negative conductor and are different from each other; the inter-pole support is an insulating member, which is located between the first conductor and the second conductor; the inner surface of the inter-pole support abuts against the outer surface of the first conductor, and the outer surface abuts against the inner surface of the second conductor; the insulating support is arranged on the bracket, and a receiving space for receiving the conductor portion is formed in the insulating support; the conductor portion is arranged in the receiving space, and the outer wall of the second conductor abuts against the inner wall of the receiving space.

[0008] Optionally, the bracket includes a base plate and two support plates; the base plate is arranged horizontally; the two support plates are parallel to each other and are vertically fixed on the upper side of the base plate; and the insulating support is located between the base plate and the two support plates.

[0009] Optionally, the inter-electrode support is annular and filled between the first conductor and the second conductor.

[0010] Optionally, the inter-electrode support includes a plurality of first support bodies; the inner surface of each support body abuts against the outer surface of the first conductor, and the outer surface abuts against the inner surface of the second conductor; and the plurality of first support bodies are evenly spaced and distributed around the axis of the first conductor.

[0011] Optionally, the insulating support is filled between the two support plates, the bottom plate and the outer surface of the second conductor.

[0012] Optionally, the insulating support includes a plurality of second support bodies; at least one second support body is disposed between each support plate and the outer surface of the second conductor; and at least one second support body is disposed between the bottom plate and the outer surface of the second conductor.

[0013] Optionally, the bracket includes a bottom plate; and at least one second support body is arranged between the bottom plate and the outer surface of the second conductor.

[0014] Optionally, the diameter of the first conductor is between 300 mm and 500 mm.

[0015] Optionally, the thickness of the inter-electrode support is between 75 mm and 125 mm.

[0016] Optionally, the inter-pole support and the insulating support may be any one of an epoxy resin insulating part, a ceramic part or an insulator.

[0017] As described above, the utility model has at least the following beneficial effects:

[0018] 1. The coaxial DC busbar of the utility model changes the arrangement of the positive and negative conductors side by side in the prior art to a coaxial arrangement of the positive and negative conductors. Interpolar supports are used between the positive and negative conductors to ensure a safe insulation distance, and the insulating supports are installed on the outside of the conductor part through brackets. The overall width of the DC busbar is reduced, the footprint of the DC busbar is reduced, the arrangement of the DC busbar is facilitated, and the external magnetic field can be effectively reduced.

[0019] 2. By coaxially arranging the positive conductor and the negative conductor, the electromotive force of the positive conductor and the negative conductor acts uniformly outward along the radial direction of the conductor part on the inter-electrode support 3 and the insulating support 4, which helps to improve the service life of the DC bus. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the coaxial DC bus structure according to the first embodiment of the utility model.

[0021] Figure 2This is a schematic diagram of the coaxial DC bus structure according to the second embodiment of the present utility model.

[0022] Figure 3 This is a schematic diagram of the coaxial DC bus structure according to the third embodiment of the present utility model.

[0023] Figure 4 This is a schematic diagram of the coaxial DC bus structure according to the fourth embodiment of the present utility model.

[0024] Figure 5 This is a schematic diagram of the coaxial DC bus structure according to the fifth embodiment of the present utility model.

[0025] Figure numerals: 1, first conductor; 2, second conductor; 3, inter-electrode support; 31, first support body; 4, insulating support; 41, second support body; 5, bottom plate; 6, support plate. DETAILED DESCRIPTION

[0026] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and the features in the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific implementation schemes, rather than to limit the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are usually carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0027] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0028] Embodiment 1

[0029] Please refer to Figure 1The utility model discloses a coaxial DC busbar, which includes a conductor part, an insulating support 4 and a bracket.

[0030] The conductor part includes a first conductor 1, a second conductor 2 and an inter-electrode support 3. The first conductor 1 and the second conductor 2 are both annular in cross section and cylindrical in shape as a whole, and their lengths can be freely adjusted according to the needs of the production site.

[0031] The first conductor 1 and the second conductor 2 are coaxially arranged, and the first conductor 1 is located inside the second conductor 2. The first conductor 1 and the second conductor 2 are either positive conductors or negative conductors and are different from each other. That is, when the first conductor 1 is a positive conductor, the second conductor 2 is a negative conductor, and when the first conductor 1 is a negative conductor, the second conductor 2 is a positive conductor.

[0032] The inter-electrode support 3 is an insulating member, which is located between the first conductor 1 and the second conductor 2. The inner surface of the inter-electrode support 3 abuts against the outer surface of the first conductor 1, and the outer surface abuts against the inner surface of the second conductor 2.

[0033] In this embodiment, the inter-pole support 3 is annular and is an epoxy resin insulating member or a ceramic member. The thickness of the inter-pole support 3 needs to be determined according to the creepage insulation distance between the first conductor 1 and the second conductor 2. In this embodiment, since the inter-pole support 3 is annular, the thickness of the inter-pole support 3 is the same as the creepage insulation distance between the first conductor 1 and the second conductor 2, which is between 75 mm and 125 mm, for example, it can be 75 mm, 100 mm, 125 mm, and can be flexibly adjusted according to needs.

[0034] The insulating support 4 is arranged on the bracket, and a receiving space for receiving the conductor part is formed in the insulating support 4. The receiving space is a cylindrical space. The conductor part is arranged in the receiving space, and the outer wall of the second conductor 2 abuts against the inner wall of the receiving space.

[0035] For details, please continue to refer to Figure 1 The bracket includes a bottom plate 5 and two support plates 6. The bottom plate 5 is arranged horizontally. The two support plates 6 are parallel to each other and are vertically fixed on the upper side of the bottom plate 5. The insulating support 4 is located between the bottom plate 5 and the two support plates 6.

[0036] The bottom plate 5 can be a rectangular plate. It can also be a rectangular frame made of angle iron or angle aluminum, and its upper side can support the insulating support 4. The support plate 6 can be a rectangular plate, or a rectangular frame made of angle iron or angle aluminum, and its side close to the insulating support 4 can fix the insulating support 4. Preferably, in this embodiment, the bottom plate 5 and the support plate 6 are both rectangular plates.

[0037] In actual application, the commonly used voltage of the DC bus is below 3KV, and in some cases it can reach 3KV to 10KV, and the current is 6000A to 18000A. Therefore, on the one hand, in order to meet the requirements of voltage and current, and on the other hand, in order to reduce the volume of the conductor part, the diameter of the first conductor 1 is between 300mm and 500mm, for example, it can be 300mm, 350mm, 400mm, 450mm, 500mm, and can be flexibly adjusted according to needs.

[0038] The coaxial DC busbar of the utility model changes the arrangement of the positive and negative conductors side by side in the prior art to a coaxial arrangement of the positive and negative conductors. An inter-pole support 3 is used between the positive and negative conductors to ensure a safe insulation distance. An insulating support 4 is installed on the outside of the conductor part through a bracket. The DC busbar is reduced in width ( Figure 1 The dimensions in the left and right directions in the figure can reduce the footprint of the DC bus, facilitate the layout of the DC bus, and effectively reduce the external magnetic field.

[0039] Secondly, by coaxially arranging the positive conductor and the negative conductor, the electromotive force of the positive conductor and the negative conductor acts uniformly outwardly on the inter-pole support 3 and the insulating support 4 along the radial direction of the conductor part, which helps to improve the service life of the DC bus.

[0040] Embodiment 2

[0041] Please refer to Figure 2 The difference between the second embodiment and the first embodiment is that the inter-electrode support 3 includes a plurality of first support bodies 31. The inner surface of each support body abuts against the outer surface of the first conductor 1, and the outer surface abuts against the inner surface of the second conductor 2. The plurality of first support bodies 31 are evenly spaced around the axis of the first conductor 1.

[0042] Specifically, Figure 2 As shown, in this embodiment, the inter-pole support 3 includes three first support bodies 31. Each first support body 31 is an insulator. The three first support bodies 31 are evenly spaced and distributed around the axis of the first conductor 1.

[0043] More specifically, in this embodiment, the first support may be an epoxy resin insulator, a ceramic part or an insulator. The creepage insulation distance between the first conductor 1 and the second conductor 2 is between 75 mm and 125 mm, for example, 75 mm, 100 mm, 125 mm, and can be flexibly adjusted as needed. When the first support 31 is an epoxy resin insulator or a ceramic part, the thickness of the first support 31 is not less than the creepage insulation distance between the first conductor 1 and the second conductor 2. When the first support 31 is an insulator, due to the broken line shape of the side of the insulator, the thickness of the first support 31 may be less than the creepage insulation distance between the first conductor 1 and the second conductor 2.

[0044] In this embodiment, the inter-pole support 3 is provided as three first support bodies 31, which reduces the weight of the inter-pole support 3 and helps to reduce the overall weight of the coaxial DC bus. In particular, when the first support body 31 is an insulator, the interval between the first conductor 1 and the second conductor 2 can be further reduced, thereby reducing the volume and weight of the coaxial DC bus.

[0045] Embodiment 3

[0046] Please refer to Figure 3 The difference between the third embodiment and the first embodiment is that the insulating support 4 includes a plurality of second support bodies 41. At least one second support body 41 is disposed between each support plate 6 and the outer surface of the second conductor 2. At least one second support body 41 is disposed between the bottom plate 5 and the outer surface of the second conductor 2.

[0047] In this embodiment, a second support body 41 is disposed between each support plate 6 and the outer surface of the second conductor 2. A second support body 41 is disposed between the bottom plate 5 and the outer surface of the second conductor 2.

[0048] The second support body 41 can not only play a supporting role, but also help to reduce the overall weight of the coaxial DC bus.

[0049] Embodiment 4

[0050] Please refer to Figure 4 , the difference between the fourth embodiment and the first embodiment is that the inter-electrode support 3 includes a plurality of first support bodies 31. The inner surface of each support body abuts against the outer surface of the first conductor 1, and the outer surface abuts against the inner surface of the second conductor 2. The plurality of first support bodies 31 are evenly spaced around the axis of the first conductor 1. The insulating support 4 includes a plurality of second support bodies 41. At least one second support body 41 is arranged between each support plate 6 and the outer surface of the second conductor 2. At least one second support body 41 is arranged between the bottom plate 5 and the outer surface of the second conductor 2.

[0051] In this embodiment, the inter-pole support 3 includes three first support bodies 31. Each first support body 31 is in the shape of an insulator. The three first support bodies 31 are evenly spaced around the axis of the first conductor 1. A second support body 41 is arranged between each support plate 6 and the outer surface of the second conductor 2. A second support body 41 is arranged between the bottom plate 5 and the outer surface of the second conductor 2.

[0052] The inter-pole support 3 is provided as a plurality of first support bodies 31 , and the insulating support 4 is provided as a plurality of second support bodies 41 , so that the weight of the coaxial DC bus is reduced while the structural strength of the coaxial DC bus is ensured.

[0053] Embodiment 5

[0054] Please refer to Figure 5 The difference between the fifth embodiment and the first embodiment is that the bracket only includes the bottom plate 5. At least one second support body 41 is arranged between the bottom plate 5 and the outer surface of the second conductor 2.

[0055] In this embodiment, the insulating support 4 includes two second support bodies 41. The two second support bodies 41 are arranged between the bottom plate 5 and the outer surface of the second conductor 2. Figure 5 The symmetry axis in the vertical direction is symmetrically distributed, and plays a role in supporting the conductor part.

[0056] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A coaxial DC bus, characterized in that: It comprises a conductor part, an insulating support (4) and a bracket; wherein: The conductor part comprises a first conductor (1), a second conductor (2) and an inter-electrode support (3); The cross-sections of the first conductor (1) and the second conductor (2) are both annular; the first conductor (1) and the second conductor (2) are coaxially arranged, and the first conductor (1) is located inside the second conductor (2); the first conductor (1) and the second conductor (2) are either positive electrode conductors or negative electrode conductors and are different from each other; The inter-electrode support (3) is an insulating member, which is located between the first conductor (1) and the second conductor (2); the inner surface of the inter-electrode support (3) abuts against the outer surface of the first conductor (1), and the outer surface abuts against the inner surface of the second conductor (2); The insulating support (4) is arranged on the bracket, and a receiving space for receiving the conductor part is formed in the insulating support (4); The conductor part is arranged in the accommodation space, and the outer wall of the second conductor (2) abuts against the inner wall of the accommodation space.

2. The coaxial DC bus according to claim 1, characterized in that: The support comprises a bottom plate (5) and two support plates (6); The bottom plate (5) is arranged horizontally; The two support plates (6) are parallel to each other and are both vertically fixed on the upper side of the base plate (5); The insulating support (4) is located between the bottom plate (5) and the two support plates (6).

3. The coaxial DC bus according to claim 1, characterized in that: The inter-electrode support (3) is annular and is filled between the first conductor (1) and the second conductor (2).

4. The coaxial DC bus according to claim 1, characterized in that: The inter-electrode support (3) comprises a plurality of first support bodies (31); The inner surface of each support body abuts against the outer surface of the first conductor (1), and the outer surface abuts against the inner surface of the second conductor (2); A plurality of the first support bodies (31) are evenly spaced and distributed around the axis of the first conductor (1).

5. The coaxial DC bus according to claim 2, characterized in that: The insulating support (4) is filled between the two support plates (6), the bottom plate (5) and the outer surface of the second conductor (2).

6. The coaxial DC bus according to claim 2, characterized in that: The insulating support (4) comprises a plurality of second support bodies (41); At least one second support body (41) is arranged between each of the support plates (6) and the outer surface of the second conductor (2); At least one second support body (41) is arranged between the bottom plate (5) and the outer surface of the second conductor (2).

7. The coaxial DC bus according to claim 6, characterized in that: The support comprises a bottom plate (5); At least one second support body (41) is arranged between the bottom plate (5) and the outer surface of the second conductor (2).

8. The coaxial DC bus according to claim 1, characterized in that: The diameter of the first conductor (1) is between 300 mm and 500 mm.

9. The coaxial DC bus according to claim 1, characterized in that: The thickness of the inter-electrode support (3) is between 75 mm and 125 mm.

10. The coaxial DC bus according to claim 1, characterized in that: The inter-pole support (3) and the insulating support (4) may be any one of an epoxy resin insulating part, a ceramic part or an insulator.

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