Vacuum contactor bypass switch

Abstract

The invention discloses a vacuum contactor bypass switch, which is characterized in that four contact springs are arranged below a second conductive soft bar of a vacuum arc extinguish chamber moving contact, the contact pressure is uniformly increased through 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] The present invention relates to the technical field of contactors, and particularly to a vacuum contactor bypass switch. Background Art

[0002] In the power system, vacuum contactors are widely used in circuit on-off control. During the closing process of the moving contact of the core component, the vacuum interrupter, problems such as poor contact, increased wear, and even pre-breakdown are likely to occur due to electric repulsive force, contact bounce, and impact vibration. In the prior art, the contact pressure is usually realized by a single spring or a simple structure, and it is difficult to evenly distribute the pressure under high-current conditions, resulting in insufficient contact stability. Especially in new industries such as photovoltaic and energy storage, the requirement for the fast closing reliability of contactors is extremely high, and the traditional design can no longer meet the needs. Therefore, there is an urgent need for a vacuum contactor that can effectively suppress contact bounce and evenly distribute contact pressure. Summary of the Invention

[0003] The embodiments of the present application are proposed to make up for the deficiencies of the prior art and provide a vacuum contactor bypass switch to solve the problems existing in the prior art.

[0004] To solve the above technical problems, the present invention provides the following technical solutions:

[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 ends through the first conductive flexible busbar and the second conductive flexible busbar. Four contact springs are symmetrically arranged below the second conductive flexible busbar. One end of each contact spring is connected to the moving contact bracket, and the other end is fixed to the lower end of the interrupter.

[0006] As a further technical solution of the present invention: it further includes a torque conversion crank arm and a spring torque adjustment screw. The torque conversion crank arm is linked with the moving contact through a fastening transmission shaft, and one end of it is connected to the contact spring through the spring torque adjustment screw.

[0007] As a further technical solution of the present invention: the contact springs are evenly distributed below the second conductive flexible busbar and are arranged parallel to the moving direction of the moving contact.

[0008] As a further technical solution of the present invention: it further includes a static end conductive copper bar, which is electrically connected to the static contact of the vacuum interrupter to form a power input terminal.

[0009] As a further technical solution of the present invention: it further includes an insulating support column, which is vertically fixed below the fixed plate to form a frame support structure.

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

[0011] (1) Through the conversion of the torque crank arm, under the condition of the same volume of the permanent magnet cylinder, the crank arm lever mechanism magnifies the effective holding force of the cylinder, reduces the weight of the movable part, and speeds up the closing speed.

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

[0013] (3) The driving mechanism mode of a single magnet cylinder with double coils increases the reliability of the bypass switch.

[0014] (4) By adding four contact springs, the contact pressure is doubled and evenly distributed, effectively suppressing all problems caused by contact bounce, electric repulsive force, and impact vibration during fast closing.

[0015] (5) By applying reverse design thinking, a misaligned connection is adopted between the magnet cylinder and the vacuum interrupter, and an independent universal joint installation method is used to avoid the lateral torsion and friction coefficient caused by the fitting tolerance, and reduce the bounce and pre-breakdown problems caused by the inclination of the vacuum interrupter contacts due to the coaxiality deviation. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] In the figure: 1 - fixed plate, 2 - static end conductive copper bar, 3 - insulating support column, 4 - vacuum interrupter, 5 - first conductive flexible bus, 6 - fastening transmission shaft, 7 - contact spring, 8 - second conductive flexible bus, 9 - torque conversion crank arm, 10 - insulator, 11 - torque conversion crank arm mounting seat, 12 - spring torque adjustment screw. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] As Figure 1 shown, a bypass switch of a vacuum contactor includes a fixed plate 1, a static end conductive copper bar 2, an insulating support column 3, a vacuum interrupter 4, a first conductive flexible bus 5, a fastening transmission shaft 6, a contact spring 7, a second conductive flexible bus 8, a torque conversion crank arm 9, an insulator 10, a torque conversion crank arm mounting seat 11, and a spring torque adjustment 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 above the fixing plate 1 by screws. The static end conductive copper bar 2 is electrically connected to the static contact of the vacuum interrupter to form a power input terminal.

[0021] The lower end of the moving contact of the vacuum interrupter 4 is connected to the input and output terminals through the first conductive flexible bus 5 and the second conductive flexible bus 8 respectively. The key improvement lies in that: four contact springs 7 are evenly distributed below the second conductive flexible bus 8. Their upper ends are fixed to the moving contact bracket, 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 closes, the contact springs 7 are compressed and deformed, providing a stable contact pressure to offset the electro-dynamic repulsion force and suppress the bounce; when opening, the springs reset to assist the quick separation of the moving contact.

[0022] One end of the torque conversion toggle arm 9 is connected to the moving contact link through the fastening transmission shaft 6, and the other end is connected to the tail of the contact spring 7 through the spring torque adjusting screw 12. The acting force of the driving mechanism is amplified through the lever principle, and at the same time, the compression amount of the spring can be finely adjusted through the adjusting screw 12 to achieve precise control of the contact pressure. The insulator 10 ensures the insulation performance between the moving contact and the frame. The torque conversion toggle arm mounting seat 11 is fixed to the side of the frame to support the stability of the toggle arm rotation.

[0023] During operation, the torque conversion toggle 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 quick separation of the moving contact, improving the opening and closing efficiency and reliability.

[0024] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0025] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of 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 fixing 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 ends through the first flexible conductive busbar (5) and the second flexible conductive busbar (8). Four contact springs (7) are symmetrically arranged below the second flexible conductive busbar (8). One end of each contact spring (7) is connected to the moving contact support, and the other end is fixed to the lower end of the interrupter.

2. The vacuum contactor bypass switch according to claim 1, characterized in that, It further includes a torque conversion crank arm (9) and a spring torque adjusting screw (12). The torque conversion crank arm (9) is linked with 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. The vacuum contactor bypass switch according to claim 1, characterized in that, The contact springs (7) are evenly distributed below the second flexible conductive busbar (8) and are arranged parallel to the moving direction of the moving contact.

4. A vacuum contactor bypass switch according to claim 1, characterized in that, It further includes a static end conductive copper bar (2), which is electrically connected to the static contact of the vacuum interrupter to form a power input terminal.

5. The vacuum contactor bypass switch according to claim 1, characterized in that, It further includes an insulating support column (3), which is vertically fixed below the fixing plate (1) to form a frame support structure.

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