Forced arc isolation device and direct current circuit breaker
By designing a forced arc isolation device in a DC circuit breaker, and using the actions of the insulated screen and elastic parts, the problem of the difficulty of extinction of arcs in a DC circuit breaker is solved, and the arc extinguishing performance and product life are improved.
Patent Information
- Application Number
- CN202421837158.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-31
AI Technical Summary
In DC systems, there is no natural zero crossing point in the current, which makes it difficult for small DC circuit breakers to extinguish arcs. The arc is prone to rekind between dynamic and static contacts, causing ablation of dynamic and static contacts, affecting product life and breaking performance.
A forced arc isolation device is designed, including an arc isolation wall and an arc isolation action mechanism. Using an insulated arc isolation screen and elastic member, the moving contact moves to the static contact when the gate is closed, and the arc isolation screen contacts and moves to form a channel. When the gate is opened, the arc isolation screen moves the isolated dynamic contact again to avoid reigniting the arc.
Through the synchronous action of the insulating screen of the arc-separating action mechanism and the moving contacts, the arc between the moving and static contacts is blocked in a short time, the arc extinguishing performance is improved, the arc reignition of the arc is avoided, the ablation of the moving and static contacts is reduced, and the product service life is extended.
Smart Images
Figure CN222927405U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of DC circuit breakers, in particular to a forced arc isolation device and a DC circuit breaker. Background Art
[0002] In a DC system, there is no natural zero crossing of the current, which makes it difficult to extinguish the arc of a small DC circuit breaker. The arc is likely to reignite between the moving and static contacts, resulting in ablation of the moving and static contacts, affecting the product life and breaking performance. In view of the above defects, this application is proposed. Summary of the Utility Model
[0003] The purpose of the utility model is to provide a forced arc isolation device and a DC circuit breaker. When the product is tripped, through the blocking effect of the insulating screen, the arc between the moving and static contacts is blocked, preventing the arc from reigniting between the moving and static contacts, reducing the ablation of the moving and static contacts by the arc, and improving the performance of the product.
[0004] To solve the above problems, the utility model provides a forced arc isolation device, including an arc isolation wall and an arc isolation action mechanism. The arc isolation action mechanism includes an arc isolation screen and an elastic member. The arc isolation screen is made of insulating material. The arc isolation screen is arranged between the front and rear arc isolation walls for isolating the moving contact from the static contact. The elastic member is connected to the arc isolation screen. When closing, the moving contact moves towards the static contact. The arc isolation screen contacts the moving contact and moves under the pressure of the moving contact to form a passage for the moving contact to pass through. The moving contact contacts the static contact. When tripping, the moving contact is separated from the static contact. The arc isolation screen moves under the action of the elastic member to isolate the moving contact from the static contact again, avoiding the re-ignition of the arc.
[0005] According to an embodiment of the utility model, the moving mode of the arc isolation screen is rotation or translation.
[0006] According to an embodiment of the utility model, arc isolation action mechanisms are arranged on both the front and rear arc isolation walls, and the front and rear arc isolation screens can contact each other.
[0007] According to an embodiment of the utility model, the contact surface between the front and rear arc isolation screens is an inclined surface.
[0008] According to an embodiment of the utility model, the arc isolation wall further includes a shaft body. The shaft body is installed on the arc isolation wall, and the arc isolation screen is connected to the shaft body.
[0009] According to an embodiment of the utility model, an installation groove is arranged on the arc isolation wall, and the shaft body and part of the arc isolation screen are located in the installation groove.
[0010] According to an embodiment of the utility model, the installation groove penetrates the arc isolation wall, and the elastic member is arranged on the opposite end surfaces of the front and rear arc isolation walls.
[0011] According to an embodiment of the present invention, the elastic member includes a spring. A positioning post is provided on the arc separating wall, and a spring connection point is provided on the arc separating screen. The spring is connected between the spring connection point and the positioning post.
[0012] A DC circuit breaker includes the above-mentioned forced arc separation device, a moving contact, and a static contact. The arc separating screen is located between the moving contact and the static contact.
[0013] According to an embodiment of the present invention, when the moving contact contacts the static contact, the elastic member is in a state of storing energy.
[0014] The beneficial effects of the present invention are as follows: By providing an arc separation action mechanism and utilizing the pulling force of the elastic member, the synchronous movement of the insulating arc separating screen and the moving contact is realized, so that the arc generated between the moving and static contacts is blocked in a short time, improving the arc extinguishing performance. And when the moving and static contacts are in the open state, the arc separating screen is separated in the middle, avoiding the re-ignition of the arc between the contacts, reducing the ablation of the moving and static contacts, being beneficial to the critical load current test and high breaking capacity test, and being beneficial to improving the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The present invention will be further described below in conjunction with the drawings and embodiments.
[0016] Figure 1 It is a schematic diagram of the overall structure of the forced arc separation device;
[0017] Figure 2 It is a schematic diagram of the structure after the arc separating screen rotates;
[0018] Figure 3 It is a schematic diagram of the internal structure of the DC circuit breaker. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0019] The following description is only used to disclose the present invention so that those skilled in the art can implement the present invention. The embodiments described below are only examples, and those skilled in the art can think of other obvious deformations. The basic principles defined in the following description can be applied to other implementation schemes, deformation schemes, improvement schemes, equivalent schemes, and other schemes that do not deviate from the spirit and scope of the present invention.
[0020]
Embodiment 1
[0021] A forced arc separation device, as Figure 1 , includes an arc separating wall 1 and an arc separation action mechanism, as Figure 3, there is an arc-running channel connecting the arc extinguishing chamber between the front and rear arc separating walls 1. The arc separating action mechanism includes an arc separating screen 2 and an elastic member 4. The arc separating screen 2 is made of insulating material, such as plastic. The arc separating screen 2 is arranged between the front and rear arc separating walls 1 for isolating the moving contact from the static contact, that is, blocking between the moving contact 200 and the static contact 300. The elastic member 4 is connected to the arc separating screen 2. When closing, the moving contact 200 moves towards the static contact 300, the arc separating screen 2 contacts the moving contact and moves under the pressure of the moving contact to form a channel for the moving contact to pass through, and the moving contact contacts the static contact. When opening, the moving contact and the static contact are separated from each other, and the arc separating screen 2 moves under the action of the elastic member 4 to isolate the moving contact and the static contact again, avoiding the reignition of the arc.
[0022] Optionally, the moving manner of the arc separating screen 2 can be either rotation or translation. In this embodiment, the rotation moving form is adopted.
[0023] Specifically, arc separating action mechanisms are arranged on both the front and rear arc separating walls 1. The front and rear arc separating screens 2 can contact each other to form isolation. The mutually contacting surfaces of the front and rear arc separating screens 2 are inclined surfaces 21, which can increase the contact area and improve the contact stability to ensure the arc separating effect. An installation groove 11 is arranged on the arc separating wall 1, and the installation groove 11 penetrates the arc separating wall 1. A shaft body 6 is installed at the installation groove 11, and the arc separating screen 2 is connected to the shaft body 6. The arrangement of the installation groove 11 makes the structure more compact. Preferably, the elastic member 4 is arranged on the opposite end faces of the front and rear arc separating walls 1 to avoid occupying too much space in the arc-running channel. In this embodiment, the elastic member 4 adopts a spring. In other embodiments, the elastic member 4 can also adopt other elastic materials such as rubber strips. A positioning column 3 is arranged on the arc separating wall 1, and a spring connection point 5 is arranged on the arc separating screen 2. The spring is connected between the spring connection point 5 and the positioning column 3.
[0024] A DC circuit breaker, such as Figure 3 , includes the above-mentioned forced arc separating device 100, moving contact 200 and static contact 300. The arc separating screen 2 is located between the moving contact 200 and the static contact 300. When closing, the moving contact 200 moves towards the static contact 300, and the moving contact 200 applies pressure to the arc separating screen 2 to make it rotate. After rotation, as Figure 2 shown, at this time the spring is stretched and stores energy, and the front and rear arc separating screens 2 are separated from each other to create a space for the moving contact 200 to pass through. The moving contact 200 contacts the static contact 300. At this time, there are two setting methods. One is that the front and rear arc separating screens 2 reset and contact again after the moving contact passes through, and the other is that the arc separating screen 2 abuts against the moving contact 200 and the spring remains in the energy storage state. In this embodiment, the second method is used. When opening, the moving contact 200 and the static contact 300 are separated, and the front and rear arc separating screens 2 can quickly contact under the action of the spring to achieve the arc separating effect.
[0025] Those skilled in the art should understand that the embodiments of the present utility model described above and shown in the accompanying drawings are only examples and do not limit the present utility model. The objectives of the present utility model have been fully and effectively achieved. The functions and structural principles of the present utility model have been demonstrated and explained in the embodiments. Without departing from the above-mentioned principles, any variations and modifications can be made to the embodiments of the present utility model.
Claims
1. A forced arc isolation device, characterized in that: The invention comprises an arc-isolating wall (1) and an arc-isolating action mechanism, wherein the arc-isolating action mechanism comprises an arc-isolating screen (2) and an elastic member (4), wherein the arc-isolating screen (2) is made of insulating material, and is arranged between the front and rear arc-isolating walls (1) for isolating a moving contact from a stationary contact, and the elastic member (4) is connected to the arc-isolating screen (2). When the switch is closed, the moving contact moves in the direction of the stationary contact, and the arc-isolating screen (2) contacts the moving contact and moves under the pressure of the moving contact to form a passage for the moving contact to pass through, and the moving contact contacts the stationary contact. When the switch is opened, the moving contact is disconnected from the stationary contact, and the arc-isolating screen (2) moves under the action of the elastic member (4) to isolate the moving contact from the stationary contact again, thereby preventing the arc from reigniting.
2. The forced arc isolation device according to claim 1, characterized in that: The arc isolation screen (2) moves in a rotational or translational manner.
3. The forced arc isolation device according to claim 1, characterized in that: The front and rear arc isolation walls (1) are both provided with arc isolation action mechanisms, and the front and rear arc isolation screens (2) can contact each other.
4. The forced arc isolation device according to claim 3, characterized in that: The contact surfaces between the front and rear arc-isolating screens (2) are inclined surfaces (21).
5. The forced arc isolation device according to claim 3 or 4, characterized in that: The arc isolation wall (1) further comprises a shaft body (6), wherein the shaft body (6) is mounted on the arc isolation wall (1), and the arc isolation screen (2) is connected to the shaft body (6).
6. The forced arc isolation device according to claim 5, characterized in that: The arc isolation wall (1) is provided with a mounting groove (11), and the shaft (6) and a part of the arc isolation screen (2) are located in the mounting groove (11).
7. The forced arc isolation device according to claim 6, characterized in that: The mounting groove (11) passes through the arc isolation wall (1), and the elastic member (4) is arranged on the end surfaces of the front and rear arc isolation walls (1) on the opposite sides.
8. The forced arc isolation device according to any one of claims 3, 4, 6 and 7, characterized in that: The elastic member (4) comprises a spring, a positioning column (3) is provided on the arc isolation wall (1), a spring connection point (5) is provided on the arc isolation screen (2), and the spring is connected between the spring connection point (5) and the positioning column (3).
9. A DC circuit breaker, characterized in that: It comprises the forced arc isolation device as claimed in any one of claims 1 to 8, a moving contact (200) and a stationary contact (300), wherein the arc isolation screen (2) is located between the moving contact (200) and the stationary contact (300).
10. The DC circuit breaker according to claim 9, characterized in that: When the moving contact (200) is in contact with the stationary contact (300), the elastic member (4) is in a force storage state.