Vacuum contactor bypass switch

Abstract

The utility model discloses a vacuum contactor bypass switch, which is characterized in that four contact springs are arranged below a second conductive soft bar of a moving contact of a vacuum arc-extinguishing chamber, the contact pressure is uniformly increased through the symmetrically distributed spring structures, the contact bounce, the electric repulsive force and the impact vibration during closing are effectively inhibited, and the contact reliability is improved. The torque conversion crank arm and the spring torque adjusting screw rod are matched, driving force amplification and accurate pressure adjustment are achieved, and the device is suitable for power control scenes with high reliability requirements.

Description

Technical Field

[0001] This utility model relates to the field of contactor technology, and in particular to a vacuum contactor bypass switch. Background Technology

[0002] In power systems, vacuum contactors are widely used for circuit switching control. However, the moving contacts of their core component, the vacuum interrupter, are prone to problems such as poor contact, accelerated wear, and even pre-breakdown during closing due to electrodynamic repulsion, contact bounce, and impact vibration. In existing technologies, contact pressure is typically achieved through a single spring or simple structure, which makes it difficult to evenly distribute pressure under high current conditions, resulting in insufficient contact stability. Especially in emerging industries such as photovoltaics and energy storage, the requirements for rapid closing reliability of contactors are extremely high, and traditional designs can no longer meet these demands. Therefore, there is an urgent need for a vacuum contactor that can effectively suppress contact bounce and evenly distribute contact pressure. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this application proposes a vacuum contactor bypass switch to solve the problems existing in the prior art.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] A vacuum contactor bypass switch includes a fixed plate, a vacuum interrupter, a first conductive flexible busbar, and a second conductive flexible busbar. The lower end of the moving contact of the vacuum interrupter is connected to the power input and output terminals through the first and second conductive flexible busbars. Four contact springs are symmetrically arranged below the second conductive flexible busbar. One end of each contact spring is connected to a moving contact bracket, and the other end is fixed to the lower end of the interrupter.

[0006] As a further technical solution of this utility model, it also includes a torque conversion crank arm and a spring torque adjusting screw. The torque conversion crank arm is linked to the moving contact through a fastening transmission shaft, and one end of it is connected to the contact spring through the spring torque adjusting screw.

[0007] As a further technical solution of this utility model: the contact springs are evenly distributed below the second conductive soft board and are arranged parallel to the direction of movement of the moving contact.

[0008] As a further technical solution of this utility model, it also includes a stationary conductive copper busbar, which is electrically connected to the stationary contact of the vacuum interrupter to form a power input terminal.

[0009] As a further technical solution of this utility model, it also includes an insulating support column, which is vertically fixed below the fixing plate to form a frame support structure.

[0010] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0011] (1) By converting the torque crank arm, the crank arm lever mechanism amplifies the effective holding force of the magnetic cylinder under the same volume state of the permanent magnet cylinder, reduces the weight of the movable part, and speeds up the closing speed.

[0012] (2) The closing time can be adjusted by the auxiliary spring force and the contact spring torque.

[0013] (3) The single magnetic cylinder and double coil drive mechanism mode increases the reliability of the bypass switch.

[0014] (4) By adding four contact springs, the contact pressure is increased several times and evenly distributed, which effectively suppresses all problems caused by contact bounce, electric repulsion and impact vibration during rapid closing.

[0015] (5) By using reverse design thinking, the magnetic cylinder and the vacuum interrupter are connected in a staggered manner and installed with independent universal joints, which avoids the lateral torque and friction coefficient caused by the tolerance of the parts and reduces the bouncing and pre-breakdown problems caused by the tilting of the vacuum interrupter contacts due to coaxiality deviation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a vacuum contactor bypass switch.

[0017] In the diagram: 1-Fixed plate, 2-Stationary conductive copper busbar, 3-Insulating support column, 4-Vacuum interrupter chamber, 5-First conductive flexible busbar, 6-Fastening drive shaft, 7-Contact spring, 8-Second conductive flexible busbar, 9-Torque conversion crank arm, 10-Insulator, 11-Torque conversion crank arm mounting base, 12-Spring torque adjusting screw. Detailed Implementation

[0018] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] like Figure 1 As shown, a vacuum contactor bypass switch includes a fixed plate 1, a stationary conductive copper busbar 2, an insulating support column 3, a vacuum interrupter 4, a first conductive flexible busbar 5, a fastening drive shaft 6, a contact spring 7, a second conductive flexible busbar 8, a torque conversion crank arm 9, an insulator 10, a torque conversion crank arm mounting base 11, and a spring torque adjusting screw 12.

[0020] The fixing plate 1 of the vacuum contactor is fixed to the bottom of the frame by four insulating support columns 3. The vacuum interrupter 4 is installed on the top of the fixing plate 1 by screws. The stationary conductive copper busbar 2 is electrically connected to the stationary contact of the vacuum interrupter to form the power input terminal.

[0021] The lower end of the moving contact of the vacuum interrupter 4 is connected to the input and output terminals respectively via the first conductive flexible busbar 5 and the second conductive flexible busbar 8. The key improvement lies in the following: four contact springs 7 are evenly distributed below the second conductive flexible busbar 8. Their upper ends are fixed to the moving contact support, and their lower ends abut against the lower end face of the interrupter, forming an elastic support for the moving contact. When the moving contact is closed, the contact springs 7 are compressed and deformed, providing stable contact pressure, counteracting the electric repulsion force, and suppressing bouncing; when the moving contact is opened, the springs reset, assisting the moving contact in rapid separation.

[0022] One end of the torque conversion crank arm 9 is connected to the moving contact linkage via the fastening drive shaft 6, and the other end is connected to the tail of the contact spring 7 via the spring torque adjusting screw 12. This leverages the lever principle to amplify the force of the drive mechanism, while allowing for fine-tuning of the spring compression by adjusting the screw 12, thus achieving precise control of the contact pressure. The insulator 10 ensures insulation between the moving contact and the frame, and the torque conversion crank arm mounting base 11 is fixed to the side of the frame, supporting the stability of the crank arm's rotation.

[0023] During operation, the torque conversion crank arm 9 pushes the moving contact to close, and the four contact springs 7 are compressed synchronously, evenly distributing the pressure to the moving contact to suppress the closing impact and subsequent bounce; when opening, the springs release energy to assist the moving contact to separate quickly, improving the efficiency and reliability of opening and closing.

[0024] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

[0025] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment have been appropriately combined to form other embodiments that are easy for those skilled in the art to understand.

Claims

1. A vacuum contactor bypass switch, comprising a fixed plate (1), a vacuum interrupter (4), a first conductive flexible busbar (5), and a second conductive flexible busbar (8), characterized in that: The lower end of the moving contact of the vacuum interrupter (4) is connected to the power input and output terminals through the first conductive soft board (5) and the second conductive soft board (8). Four contact springs (7) are symmetrically arranged below the second conductive soft board (8). One end of the contact spring (7) is connected to the moving contact bracket, and the other end is fixed to the lower end of the vacuum interrupter (4).

2. A vacuum contactor bypass switch according to claim 1, characterized in that, It also includes a torque conversion crank arm (9) and a spring torque adjusting screw (12). The torque conversion crank arm (9) is linked to the moving contact through a fastening transmission shaft (6), and one end of it is connected to the contact spring (7) through the spring torque adjusting screw (12).

3. A vacuum contactor bypass switch according to claim 1, characterized in that, The contact springs (7) are evenly distributed below the second conductive soft board (8) and are arranged parallel to the direction of movement of the moving contact.

4. A vacuum contactor bypass switch according to claim 1, characterized in that, It also includes a stationary conductive copper busbar (2), which is electrically connected to the stationary contact of the vacuum interrupter.

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