Moving contact assembly and on-load tap-changer

Abstract

The utility model provides a moving contact assembly and an on-load tap-changer, the moving contact assembly comprises an insulation support, two oppositely arranged clamping piece type main contacts, a plurality of rolling contact pieces, a contact seat and a spring piece, the rolling contact pieces are connected with one end of the spring piece, the other end of the spring piece is connected with the contact seat, and the contact seat is connected with the insulation support. The insulation support is provided with a contact groove, the contact seat is arranged in the contact groove, the rolling contact piece comprises a main rolling contact piece and a transition rolling contact piece which are independent from each other, the contact seat connected with the main rolling contact piece is connected with the main contact, and the contact seat connected with the transition rolling contact piece is connected with the transition rolling contact piece. The main contact is arranged in the contact groove, and one end, close to the rolling contact piece, of the main contact extends out of the contact groove. According to the utility model, by changing the appearance of the insulating bracket, the use of laminated pieces and clamping rings is reduced, so that the available space on the bracket is increased, the spring steel sheets for fixing the rolling contacts can be lengthened, and the pressure between the rolling contacts is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of on-load tap-changers, and particularly relates to a moving contact assembly and an on-load tap-changer. Background Art

[0002] An on-load tap-changer refers to a voltage regulating device suitable for operation under the excitation or load of a transformer and used to change the tap connection position of the transformer winding. Its basic principle is to realize the switching between taps in the transformer winding without interrupting the load current, thereby changing the number of turns of the winding, that is, the voltage ratio of the transformer, and ultimately achieving the purpose of voltage regulation.

[0003] Such tap-changers mainly consist of an insulating bracket installation, main contacts, main contact seats, clamping rings, and rolling contacts. The auxiliary contact seat on the insulating bracket is a laminated part, which is complex to process and costly, and needs to be installed on the clamping ring and fixed on the round shaft. The remaining installation space is very small, so the sizes of the moving contact and the rolling contact have to be reduced, resulting in a reduced range of movement, an increased pressure between the static contact, the moving contact, and the rolling contact, making it very difficult to switch gears, and in severe cases, even getting stuck and unable to switch gears. Summary of the Utility Model

[0004] The embodiments of the utility model provide a moving contact assembly and an on-load tap-changer, which can solve the technical problem of difficult gear switching existing in the existing moving contact assembly.

[0005] In a first aspect, the embodiments of the utility model provide a moving contact assembly, including an insulating bracket, two oppositely arranged clip-type main contacts, a plurality of rolling contact members, a contact seat, and a spring piece. One end of the rolling contact member is connected to the spring piece, and the other end of the spring piece is connected to the contact seat. A contact groove is formed on the insulating bracket, and the contact seat is arranged in the contact groove. The rolling contact member includes an independent main rolling contact member and a transition rolling contact member. The contact seat connected to the main rolling contact member is connected to the main contact. The main contact is arranged in the contact groove, and one end of the main contact close to the rolling contact member extends outside the contact groove.

[0006] Advantages of the embodiments of the present utility model: By setting the insulating bracket as a plate shape and then providing contact head grooves thereon to fix the contact head seat and the main contact head, and connecting the contact head seat with a spring piece, the rolling contact member connected with the spring piece is fixed. By changing the shape of the insulating bracket, the use of laminates and clamping rings is reduced, increasing the available space on the bracket. Thus, the spring steel sheet for fixing the rolling contact can be lengthened, increasing its elasticity and reducing the pressure between the rolling contacts, thereby reducing the risk of jamming during switching. At the same time, the width of the main contact head can be increased, enabling a higher current to pass through, and making the switch more reliable and safe. The change in the shape of the bracket can also make the assembly more convenient. One only needs to fix it according to the hole positions, without the need to measure and adjust with a ruler, greatly improving the production efficiency.

[0007] In one embodiment, each of the rolling contact members includes two rolling contacts arranged oppositely. Each of the rolling contacts is sleeved on a shaft, and the rolling contact can rotate around the shaft. Two ends of the shaft are connected to a shaft bracket, and the shaft bracket is connected to one end of the spring piece.

[0008] Advantages of the embodiments of the present utility model: The shaft and the shaft bracket can fix the rolling contact, and then through the spring piece and the contact head seat, the insulating bracket can fix the rolling contact. The spring piece can reduce the pressure between the rolling contacts.

[0009] In one embodiment, the contact head seat connected to the main rolling contact member is connected to the main contact head through a connecting piece. The connecting piece is arranged between the contact head groove and the contact head seat. The connecting piece is in surface contact with the contact head seat and in point contact with the main contact head.

[0010] Advantages of the embodiments of the present utility model: By arranging the connecting piece between the contact head groove and the contact head seat, the fixing of the connecting piece can be realized, and at the same time, the contact area between the connecting piece and the contact head seat can be increased, thus ensuring the effective contact between the connecting piece and the contact head seat and enabling a higher current to pass through.

[0011] In one embodiment, there are two sets of the transition rolling contact members.

[0012] Advantages of the embodiments of the present utility model: Arranging two sets of transition rolling contact members can form a double-resistance circuit, thus ensuring the stability during switching.

[0013] In one embodiment, the insulating bracket is in a convex-shaped plate form. The protruding part of the insulating bracket faces the rolling contact member. Three contact head grooves are respectively arranged on two opposite surfaces of the insulating bracket along the protruding direction of the insulating bracket. The contact head groove provided with the main contact head is arranged along the protruding direction of the insulating bracket, and one end of the main contact head extends outside the protruding part of the insulating bracket.

[0014] Advantages of the embodiment of the present utility model: By respectively arranging three contact grooves on the opposite two surfaces of the insulating bracket, the fixation of three groups of rolling contact members can be realized. Meanwhile, by setting the insulating bracket in a convex shape, the position of the main contact can be closer to the rolling contact.

[0015] In one embodiment, the main contact is connected to the insulating bracket by a pin.

[0016] Advantages of the embodiment of the present utility model: Connecting the main contact and the insulating bracket by a pin can make the up-and-down movement of the main contact unobstructed, thus facilitating the setting of the flexible connection in the middle of the clip-type main contact.

[0017] In one embodiment, the contact seat is Z-shaped. The two parallel sides of the contact seat are respectively connected to the insulating bracket and the spring piece, and the contact seat is connected to the insulating bracket and the spring piece by bolts.

[0018] Advantages of the embodiment of the present utility model: By setting the contact seat in a Z shape, the space of the main contact can be further increased. The bolts can firmly fix the contact seat on the insulating bracket and are also convenient for assembly.

[0019] In a second aspect, an on-load tap-changer provided by the embodiment of the present utility model includes the above-mentioned moving contact assembly. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 is a three-dimensional schematic diagram of the moving contact assembly provided by the embodiment of the present utility model;

[0022] Figure 2 is a three-dimensional schematic diagram of the moving contact assembly provided by the embodiment of the present utility model (the insulating bracket is not shown);

[0023] Figure 3 is a three-dimensional schematic diagram of the insulating bracket provided by the embodiment of the present utility model.

[0024] Description of the Drawings: 1 - insulating bracket, 11 - contact groove, 2 - contact seat, 3 - spring piece, 4 - main contact, 5 - rolling contact member, 51 - rolling contact, 52 - shaft, 53 - shaft bracket, 6 - connecting piece. Detailed Embodiments

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present utility model. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present utility model, and are not used to limit the present utility model. In the present utility model, unless otherwise stated, the orientation words such as "upper" and "lower" usually refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the drawings; while "inner" and "outer" refer to the outline of the device.

[0026] An embodiment of the present utility model provides a moving contact assembly, which includes a rectangular parallelepiped plate-shaped insulating bracket 1, two relatively arranged clip-type main contacts 4, 3 rolling contact members 5, a contact seat 2 and a spring piece 3.

[0027] The rolling contact member 5 includes 1 main rolling contact member and 2 transition rolling contact members, and the main rolling contact member is arranged between the 2 transition rolling contact members. Each rolling contact member 5 includes two relatively arranged rolling contacts 51, each rolling contact 51 is sleeved on a shaft 52, and the rolling contact 51 can rotate around the shaft 52. The two ends of the shaft 52 are connected to a shaft bracket 53. The shaft bracket 53 is riveted to one end of the spring piece 3, and the other end of the spring piece 3 is connected to the contact seat 2 by bolts.

[0028] The insulating bracket 1 is in a convex-shaped plate shape. Three contact grooves 11 are respectively opened on the two opposite surfaces of the insulating bracket 1 along the protruding direction of the insulating bracket 1, and the contact seats 2 connected to the 3 rolling contact members 5 are respectively arranged in the 3 contact grooves 11. The contact seat 2 is in a Z shape, and the two parallel sides of the contact seat 2 are respectively connected to the insulating bracket 1 and the spring piece 3.

[0029] The protruding part of the insulating bracket 1 is arranged towards the rolling contact member 5. The clip-type main contacts 4 are relatively arranged in the contact grooves 11 of the protruding part of the insulating bracket 1, and one end of the main contact 4 close to the rolling contact member 5 extends outside the contact groove 11. The main contact 4 is connected to the insulating bracket 1 by a pin. A connecting piece 6 is arranged in the contact groove 11 of the contact seat 2 connected to the main rolling contact member. The connecting piece 6 is arranged between the contact groove 11 and the contact seat 2. Bolts penetrate through the connecting piece 6, the contact groove 11 and the contact seat 2 to connect the connecting piece 6, the contact seat 2 and the insulating bracket 1. The connecting piece 6 is in surface contact with the contact seat 2, and one end of the connecting piece 6 extends outside the contact seat 2 and is in point contact with the main contact 4.

[0030] During switching, the rolling contacts of the two transitional rolling contact members are respectively connected to the main contact 4 through a transition resistor, and the main contact 4 is connected by a flexible connection, so that the current can flow through.

[0031] The embodiments of the present invention have been described in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A moving contact component, characterized in that, It includes an insulating bracket (1), two oppositely arranged clip-type main contacts (4), a plurality of rolling contact members (5), a contact seat (2) and a spring piece (3). One end of the rolling contact member (5) is connected to the spring piece (3), and the other end of the spring piece (3) is connected to the contact seat (2). A contact groove (11) is formed on the insulating bracket (1), and the contact seat (2) is arranged in the contact groove (11). The rolling contact member (5) includes an independent main rolling contact member and a transition rolling contact member. The contact seat (2) connected to the main rolling contact member is connected to the main contact (4). The main contact (4) is arranged in the contact groove (11), and one end of the main contact (4) close to the rolling contact member (5) extends outside the contact groove (11).

2. The moving contact assembly according to claim 1, wherein, Each of the rolling contact members (5) includes two oppositely arranged rolling contacts (51). Each of the rolling contacts (51) is sleeved on a shaft (52), and the rolling contact (51) can rotate around the shaft (52). Both ends of the shaft (52) are connected to a shaft bracket (53), and the shaft bracket (53) is connected to one end of the spring piece (3).

3. The moving contact assembly according to claim 1, characterized in that, The contact seat (2) connected to the main rolling contact member is connected to the main contact (4) through a connecting piece (6). The connecting piece (6) is arranged between the contact groove (11) and the contact seat (2). The connecting piece (6) is in surface contact with the contact seat (2), and the connecting piece (6) is in point contact with the main contact (4).

4. The moving contact assembly according to claim 1, wherein, There are two sets of the transition rolling contact members.

5. The moving contact assembly according to claim 4, characterized in that, The insulating bracket (1) is in a convex-shaped plate form. The protruding part of the insulating bracket (1) faces the rolling contact member (5). Three contact grooves (11) are respectively arranged on two opposite surfaces of the insulating bracket (1) along the protruding direction of the insulating bracket (1). The contact groove (11) provided with the main contact (4) is arranged along the protruding direction of the insulating bracket (1), and one end of the main contact (4) extends outside the protruding part of the insulating bracket (1).

6. The moving contact assembly according to claim 1, wherein The main contact (4) is connected to the insulating bracket (1) through a pin.

7. The moving contact component according to claim 1, characterized in that The contact seat (2) is in a Z shape. Two parallel sides of the contact seat (2) are respectively connected to the insulating bracket (1) and the spring piece (3). The contact seat (2) is connected to the insulating bracket (1) and the spring piece (3) through bolts.

8. A on-load tap-changer, characterized in that, It includes a moving contact assembly according to any one of claims 1-7.

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