Central shaft and star-shaped frame for dry-type air-core reactor

Abstract

The utility model discloses a central shaft and a star-shaped frame for a dry-type air-core reactor, and the central shaft comprises a first sub-shaft which is uniformly provided with at least two first welding grooves along the circumferential direction of the outer side; at least two second welding grooves are uniformly distributed in the outer side of the second sub-shaft in the circumferential direction; the first welding groove and the second welding groove are formed in the same direction. According to the central shaft and the star-shaped frame for the dry-type air-core reactor, the central shaft adopts a structure in which the two sub-shafts are designed in parallel, and the two sub-shafts are synchronously provided with the welding grooves so as to be welded with the star-shaped arms; by means of the gap between the two sub-shafts, generation of eddy current and increase of heat caused by the eddy current are reduced, meanwhile, the complexity degree of manufacturing of an existing center shaft is reduced, and the production and machining efficiency of the dry-type air-core reactor is guaranteed.

Description

Technical Field

[0001] The utility model relates to a central shaft and a star-shaped frame for a dry-type air-core reactor, belonging to the technical field of reactors. Background Art

[0002] A dry-type air-core reactor (reactor) is an inductive high-voltage electrical appliance in which the magnetic flux forms a loop through air and the windings and iron core are not immersed in an insulating liquid. Usually, a star-shaped frame is used as a support at both ends of the reactor to ensure the rigidity of the reactor. The star-shaped frame is fixed by welding a plurality of star-shaped arms to the central shaft. In order to ensure the solid and stable overall structure, the size of the central shaft is set relatively thick. Although this meets the need for welding strength, the eddy current of the reactor will generate heat, resulting in too high temperature and affecting the service life of the reactor at the same time.

[0003] At present, the way to eliminate eddy current is to set horizontal or vertical gaps at the central shaft. Although this can reduce the heat generated by eddy current to a certain extent, increasing the gap will increase the complexity of manufacturing the central shaft and reduce the production and processing efficiency of the reactor. Summary of the Utility Model

[0004] Therefore, the purpose of the utility model is to provide a central shaft and a star-shaped frame for a dry-type air-core reactor, which can ensure the production and processing efficiency of the reactor while reducing the heat generated by eddy current.

[0005] In order to achieve the above purpose, on the one hand, the utility model provides a central shaft for a dry-type air-core reactor, including:

[0006] A first sub-shaft, on which at least two first welding grooves are evenly distributed along the outer circumferential direction;

[0007] A second sub-shaft, on which at least two second welding grooves are evenly distributed along the outer circumferential direction;

[0008] The opening directions of the first welding grooves and the second welding grooves are the same.

[0009] Further, the first sub-shaft and the second sub-shaft are synchronously provided with first notches along the axial direction.

[0010] Further, the first sub-shaft and the second sub-shaft are respectively provided with weight-reducing grooves along the inner circumferential direction.

[0011] Further, the outer peripheries of the first sub-shaft and the second sub-shaft are in an inverted arc shape.

[0012] On the other hand, the utility model provides a star-shaped frame, including the central shaft provided in the previous aspect, and further including:

[0013] At least two star-shaped arms, the star-shaped arms are provided with open ends that are open along the length direction, and the open ends are welded to the first sub-shaft through the first welding groove and welded to the second sub-shaft through the second welding groove.

[0014] Furthermore, the number of the first welding grooves, the number of the second welding grooves are the same as the number of the star-shaped arms.

[0015] Furthermore, a plurality of wire winding notches are distributed along the length direction of the edge of the star-shaped arm.

[0016] Adopting the above technical solution, a central shaft and a star-shaped frame for a dry-type air-core reactor provided by the present utility model, wherein the central shaft adopts a structure with two parallel sub-shafts, and the two sub-shafts are synchronously provided with welding grooves for welding with the star-shaped arms. The gap between the two sub-shafts is utilized to reduce the generation of eddy currents and the increase in heat caused by the eddy currents. At the same time, the complexity of manufacturing the existing central shaft is reduced, and the production and processing efficiency of the dry-type air-core reactor is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a central shaft for a dry-type air-core reactor provided by the present utility model;

[0018] Figure 2 is a schematic structural diagram of a star-shaped frame provided by the present utility model;

[0019] Figure 3 is a partial enlarged view of the central shaft in a star-shaped frame provided by the present utility model;

[0020] Figure 4 is a schematic structural diagram of a star-shaped arm in a star-shaped frame provided by the present utility model.

[0021] In the figure: 1, the first sub-shaft; 2, the first welding groove; 3, the second sub-shaft; 4, the second welding groove; 5, the first notch; 6, the weight reduction groove; 7, the star-shaped arm; 8, the open end; 9, the wire winding notch. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0023] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, the present utility model provides a central shaft for a dry-type air-core reactor, including:

[0024] The first sub-shaft 1, at least two first welding grooves 2 are evenly distributed along the outer circumferential direction of the first sub-shaft 1;

[0025] The second sub-axis 3 has at least two second welding grooves 4 evenly distributed along the outer circumferential direction; in a preferred embodiment, the first sub-axis 1 and the second sub-axis 3 can adopt exactly the same structure to simplify the processing technology; similarly, there can also be differences in dimensions (such as thickness) according to needs to meet the actual use requirements.

[0026] The opening directions of the first welding groove 2 and the second welding groove 4 are the same. The same opening direction means grooving along the same straight line to facilitate welding with the star-shaped arm 7 in the later stage. During the welding process, a gap is reserved between the first sub-axis 1 and the second sub-axis 3 to achieve the purpose of reducing eddy currents; at the same time, in order to further reduce eddy currents, the first sub-axis 1 and the second sub-axis 3 are synchronously provided with first notches 5 along the axial direction.

[0027] In addition, the first sub-axis 1 and the second sub-axis 3 are respectively provided with weight-reducing grooves 6 along the inner circumferential direction. The weight-reducing grooves 6 should be evenly distributed along the inner circumference of the central axis. For example, weight-reducing grooves 6 can be provided between adjacent first welding grooves 2 and / or second welding grooves 4 to achieve the purpose of reducing the weight of the central axis. Similarly, in order to achieve weight reduction of the central axis, the outer circumferences of the first sub-axis 1 and the second sub-axis 3 can be set as inverted arcs, preferably synchronously set as inverted arcs. It should be noted here that the inverted arc means a structure with a larger edge thickness than the central thickness. For example, the thickness of the first sub-axis 1 at the first welding groove 2 is greater than the thickness at the position between the first welding grooves 2, which can not only ensure that the first welding groove 2 has sufficient depth to meet the welding quality, but also further reduce the weight of the first sub-axis 1.

[0028] The central axis for a dry-type air-core reactor provided by the embodiment of the present utility model adopts a structure with two parallel sub-axes. The two sub-axes are synchronously provided with welding grooves for welding with the star-shaped arms, and the gap between the two sub-axes is used to reduce the generation of eddy currents and the increase in heat caused by eddy currents. At the same time, the complexity of the existing central axis manufacturing is reduced, and the production and processing efficiency of the dry-type air-core reactor is ensured.

[0029] In addition, the present application also provides a star-shaped frame, which adopts the central axis provided by the foregoing embodiment, and specifically includes:

[0030] At least two star-shaped arms 7, the star-shaped arms 7 are provided with open ends 8 opening along the length direction. The open ends 8 are welded to the first sub-axis 1 through the first welding groove 2 and welded to the second sub-axis 3 through the second welding groove 4.

[0031] The number of the first welding grooves 2, the number of the second welding grooves 4 and the number of the star-shaped arms 7 may be the same or different; for example, the number of the first welding grooves 2 is 6; the number of the second welding grooves 4 is also 6, and the number of the star-shaped arms 7 is also 6; or the number of the first welding grooves 2 is 6; the number of the second welding grooves 4 is also 3, and the number of the star-shaped arms 7 is also 3; however, the star-shaped arms 73 should be evenly distributed along the circumferences of the first sub-axis 1 and the second sub-axis 3 to ensure that the center of gravity of the star-shaped frame is located at the central axis. The opening length of the open end 8 should be greater than 5 mm to ensure reducing eddy current and the generated heat.

[0032] In addition, a plurality of wire winding notches 9 are distributed along the length direction at the edge of the star-shaped arm 7. Strut insulators are connected in parallel between the star-shaped frames, and the coil is wound around the strut insulators through the above-mentioned wire winding notches 9 to realize the binding of the coil.

[0033] The star-shaped frame adopted in the embodiment of the present utility model, by adopting the central axis provided in the foregoing embodiment and setting one end of the star-shaped arm as an open end aiming at the gap between the sub-axes, while reducing the generation of eddy current, is beneficial to the welding between the central axis and the star-shaped arm, and ensures the processing efficiency of the dry-type air-core reactor.

[0034] Obviously, the above embodiments are only examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the creation of the present utility model.

Claims

1. A central axis for a dry-type air-core reactor, characterized in that: include: A first sub-shaft (1), wherein the first sub-shaft (1) has at least two first welding grooves (2) evenly distributed along the outer circumference; A second sub-shaft (3), wherein the second sub-shaft (3) has at least two second welding grooves (4) evenly distributed along the outer circumference; The first welding groove (2) and the second welding groove (4) are opened in the same direction.

2. The central axis for a dry-type air-core reactor according to claim 1, characterized in that: The first sub-shaft (1) and the second sub-shaft (3) are synchronously provided with a first notch (5) along the axial direction.

3. The central shaft for a dry-type air-core reactor according to claim 1, characterized in that: The first sub-shaft (1) and the second sub-shaft (3) are respectively provided with a weight-reducing groove (6) along the inner circumference.

4. The central shaft for a dry-type air-core reactor according to claim 1, characterized in that: The outer circumferences of the first sub-axis (1) and the second sub-axis (3) are in an inverted arc shape.

5. A star frame, comprising the central axis according to any one of claims 1 to 4, characterized in that: Also includes: At least two star-shaped arms (7), each of the star-shaped arms (7) being provided with an open end (8) opened along a length direction, the open end (8) being welded to the first sub-axis (1) through the first welding groove (2), and being welded to the second sub-axis (3) through the second welding groove (4).

6. The star frame according to claim 5, characterized in that: The number of the first welding grooves (2), the number of the second welding grooves (4) and the number of the star arms (7) are the same.

7. The star frame according to claim 5, characterized in that: The edge of the star-shaped arm (7) is provided with a plurality of winding notches (9) distributed along the length direction.

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