Air-core reactor

Abstract

The utility model relates to the field of fixed inductor devices without magnetic cores, in particular to an air-core reactor. The air-core reactor comprises a plurality of groups of coil windings which are concentrically arranged and are wound by cables, and a supporting part which is used for supporting the coil windings in the radial direction and the axial direction of the reactor, and each group of coil windings comprises a plurality of coil sections which are arranged at intervals in the axial direction. Heat dissipation air channels used for coil heat dissipation are formed between the coil segments and between every two adjacent coil windings. The heat generated by each coil segment can be dissipated from the heat dissipation air channels between the two adjacent coil segments and between the two adjacent coil windings, and the coil windings can be subjected to segmented heat dissipation through segmented arrangement of the coil windings, so that the heat dissipation speed of the coil windings is increased. The air-core reactor solves the problem that an existing air-core reactor formed by winding cables is high in temperature rise.

Description

Technical Field

[0001] This utility model relates to the field of fixed inductor devices without magnetic cores, and more particularly to air-core reactors. Background Technology

[0002] Air-core reactors are inductive high-voltage electrical devices used in power systems to limit short-circuit currents and provide reactive power compensation. Existing air-core reactor structures include... Figure 1 As shown, the reactor includes multiple sets of concentrically arranged coil windings, each set of windings being made of one or more parallel enameled round aluminum wires 1. An insulating protective layer 2 is wrapped around the outside of the coil windings to protect them. Multiple support strips are spaced circumferentially between adjacent coil windings wrapped with the insulating protective layer 2, and the channels between adjacent support strips form heat dissipation channels for the coil windings. Therefore, the insulating protective layer 2 outside the reactor coil windings is relatively sealed and has low thermal conductivity, resulting in low heat dissipation efficiency for the reactor coil windings.

[0003] To address this issue, Chinese utility model patent CN2416586Y discloses a dry-type air-core reactor. The coil winding of this reactor is made of cable, with single-core or multi-core cable replacing the original single or multiple parallel enameled round aluminum conductors. Because the cable has a thicker insulation layer, it can meet the insulation and protection requirements. Therefore, it is not necessary to wrap an additional insulation protective layer on the outside of the winding coil, thereby improving the heat dissipation efficiency of the reactor coil winding.

[0004] Cables are generally wound continuously in a spiral pattern along the axial direction of the reactor. If multi-core cables are used for coil winding, the cables will still generate a lot of heat, which will accumulate in the axial direction between the continuously wound multi-turn cable coils, resulting in a higher temperature rise in the air-core reactor. Utility Model Content

[0005] The purpose of this invention is to provide an air-core reactor to solve the problem of high temperature rise in existing air-core reactors made of wound cables.

[0006] To achieve the above objectives, the air-core reactor of this utility model adopts the following technical solution:

[0007] An air-core reactor includes multiple sets of concentrically arranged coil windings wound with cables, and support components for supporting the coil windings radially and axially in the reactor. Each set of coil windings includes multiple coil segments spaced apart axially, and heat dissipation channels for coil cooling are formed between the coil segments and between adjacent coil windings.

[0008] Furthermore, the support component includes support bars disposed on both sides of the coil winding for supporting the coil winding. The support bars are arranged at intervals along the circumference of the reactor. The support gap between two adjacent support bars and the separation gap between two adjacent coil segments together constitute the heat dissipation air passage.

[0009] Furthermore, the support bar is provided with a constraint structure for constraining the coil winding.

[0010] Furthermore, the constraint structure is a constraint groove provided on the two supporting sides of the support plate, and the constraint groove is arranged at intervals along the length direction of the support plate.

[0011] Furthermore, the support strip is a long strip-shaped support plate.

[0012] Furthermore, the support plate is a glass fiber support plate made of polyester glass fiber material.

[0013] Furthermore, the support component also includes star-shaped arms located at both ends of the coil winding and extending radially from the center of the coil winding.

[0014] Furthermore, the star-shaped boom is a star-shaped boom with six equal parts.

[0015] Beneficial Effects: This utility model of an air-core reactor is a modified invention, specifically comprising multiple sets of concentrically arranged coil windings and supporting components for supporting the coil windings. Each set of coil windings includes multiple spaced coil segments in the axial direction, and cooling channels for coil heat dissipation are formed between the coil segments and between adjacent coil windings. The heat generated by each coil segment can be dissipated through the cooling channels between adjacent coil segments and between adjacent coil windings. Segmenting the coil windings allows for segmented heat dissipation, thereby accelerating the heat dissipation rate of the coil windings. This solves the problem of high temperature rise in existing air-core reactors made of cable windings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a hollow reactor in the prior art;

[0017] Figure 2 This is a schematic diagram of the structure of one embodiment of the air-core reactor of this utility model;

[0018] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0019] Figure 4 for Figure 2 A schematic diagram of the structure of the middle support rod.

[0020] In the diagram: 1. Enameled round aluminum conductor; 2. Insulation protective layer; 3. Cable; 4. Support bar; 41. Support plate; 5. Heat dissipation duct; 6. Star-shaped arm; 7. Coil winding; 71. Coil segment; 8. Constraint slot. Detailed Implementation

[0021] The coil winding of the air-core reactor made of cable of this utility model includes multiple spaced coil segments in the axial direction. There are heat dissipation channels between the coil segments and between two adjacent coil windings for coil heat dissipation. The heat generated by the coil winding can be dissipated from the heat dissipation channels between two adjacent coil segments and between two adjacent coil windings. By segmenting the coil winding, coil segment heat dissipation can be carried out, thereby making the heat dissipation efficiency of the coil winding of the cable-wound reactor higher.

[0022] Based on the above concept, such as Figure 2-3 As shown, the hollow reactor of this utility model includes multiple sets of concentrically arranged coil windings 7 and support components for supporting the coil windings 7 in the radial and axial directions of the reactor. Each set of coil windings includes multiple coil segments 71 spaced apart in the axial direction. There are heat dissipation channels 5 between the coil segments 71 and between two adjacent coil windings 7 for coil heat dissipation.

[0023] The supporting components include support bars 4 disposed between adjacent sets of coil windings to support and fix the adjacent sets of coil windings. The support bars 4 are preferably elongated support plates 41; in other embodiments, the support bars 4 can also be cylindrical support rods. The support plates 41 are usually made of insulating materials. Preferably, the support plates 41 are glass fiber support plates made of polyester glass fiber material. Of course, in other embodiments, the support plates 41 can also be made of other insulating materials, such as epoxy resin, silicone rods, or wooden strips. The support plates 41 are arranged at intervals along the circumference of the reactor. The support gaps between adjacent support plates 41 and the separation gaps between adjacent coil segments together constitute the heat dissipation channels 5. The heat dissipation channels 5 are used to dissipate and remove the heat generated during the operation of the reactor, ensuring that its operating temperature is within a safe range.

[0024] To prevent the cable 3 inside the coil winding 7 from moving axially due to reactor vibration, such as Figure 4 As shown, the support rod 41 is also provided with a constraint structure for constraining the coil winding 7. Preferably, the constraint structure is a constraint groove 8 provided on the two supporting sides of the support plate 41. The constraint groove 8 is arranged at intervals along the length direction of the support plate 41. When the cable 3 is wound, each turn of the cable 3 is inserted into the constraint groove 8 to achieve the purpose of fixing the coil winding 7. In other embodiments, the constraint structure may also be a flange protruding outward along the two supporting sides of the support plate 41. The flange is arranged at intervals along the length direction of the support plate 41, and the cable 3 is wound in segments between adjacent flanges.

[0025] The support component also includes star-shaped arms 6 located at both ends of the coil winding 7 and extending radially from the center of the coil winding 7. The star-shaped arms 6 are six-part star-shaped arms, with aluminum arms at each end for connecting to the coil winding and achieving electrical connection with other structures. In other embodiments, the star-shaped arms 6 can also be other types of star-shaped arms, such as eight-part or four-part star-shaped arms.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A hollow reactor, characterized by The reactor comprises a plurality of sets of coil windings arranged concentrically and wound by cables, and a support component for supporting the coil windings in the radial and axial directions of the reactor, each set of coil windings comprising a plurality of coil segments arranged axially at intervals, and a heat dissipation air channel for heat dissipation of the coil being formed between the coil segments and between adjacent two coil windings.

2. The air-core reactor of claim 1, wherein The support component comprises support strips arranged at intervals along the circumferential direction of the reactor for supporting the coil windings, and a support gap between adjacent two support strips and a separation gap between adjacent two coil segments jointly form the heat dissipation air channel.

3. The air-core reactor of claim 2, wherein, The support strips are provided with a constraint structure for constraining the coil windings.

4. The air-core reactor of claim 3, wherein The constraint structure is a constraint groove arranged on both support sides of the support plate and arranged at intervals along the length direction of the support plate.

5. The air-core reactor of claim 2, wherein, The support strips are long-strip-shaped support plates.

6. The air-core reactor of claim 5, wherein, The support plate is a glass filament support plate made of polyester glass filament material.

7. A reactor according to any of claims 1-6, characterized in that The support component further comprises star-shaped arm supports arranged at both ends of the coil windings and extending radially from the center of the coil windings.

8. The air-core reactor of claim 7, wherein, The star-shaped arm supports are six-equal-division star-shaped arm supports.

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