An arc extinguishing device and circuit breaker

Abstract

The utility model relates to an arc extinguishing device and circuit breaker, including static contact, arc extinguishing chamber, arc separation spare, arc extinguishing chamber sets up the top of static contact, arc separation spare sets up between the bottom of arc extinguishing chamber and static contact, and arc separation spare covers the upper surface of static contact, the utility model discloses covering arc separation spare on the surface of static contact, has constructed the effective protection barrier, this design not only avoided arc reignition and product sputtering through physical isolation, protected static contact, can also guide and assist arc extinguishing chamber to split, cool and extinguish arc faster, significantly reduced the direct ablation and thermal shock of arc to static contact.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to an arc-extinguishing device and a circuit breaker. Background Technology

[0002] Circuit breakers are crucial protective electrical appliances in power systems. One of their core functions is to quickly and reliably interrupt fault current when a circuit fault occurs. During this process, a high-temperature and high-pressure electric arc is generated when the moving and stationary contacts separate. Whether the arc can be extinguished efficiently directly determines the breaking capacity and electrical life of the circuit breaker.

[0003] Currently, common circuit breaker arc extinguishing devices typically include a stationary contact and an arc extinguishing chamber located above it. However, there are significant shortcomings in the existing technology. During the process of introducing the arc into the arc extinguishing chamber, the high-temperature arc plasma directly burns the surface of the stationary contact. This not only leads to the ablation of the stationary contact material and a shortened service life, but may also contaminate the interior of the arc extinguishing chamber due to the sputtering of metal vapor, affecting the subsequent arc extinguishing efficiency. At the same time, the arc path from the stationary contact to the arc extinguishing chamber may be unstable, affecting the arc transfer speed. In addition, some components designed to protect the stationary contact or guide the arc may be prone to displacement or loosening under strong arc impact and long-term equipment vibration, thereby reducing the reliability of protection and posing a potential hazard to the safe operation of the equipment. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide an arc extinguishing device and circuit breaker with a stable structure, high arc extinguishing efficiency, and effective protection of stationary contacts from arc erosion.

[0005] In a first aspect, this utility model provides an arc-extinguishing device, including a stationary contact, an arc-extinguishing chamber, and an arc-isolating component. The arc-extinguishing chamber is disposed above the stationary contact, and the arc-isolating component is disposed between the bottom of the arc-extinguishing chamber and the stationary contact, covering the upper surface of the stationary contact.

[0006] The beneficial effects of the above structure are as follows: by covering the surface of the stationary contact with an arc-blocking component, an effective protective barrier is constructed. This design not only avoids arc reignition and product sputtering through physical isolation, thus protecting the stationary contact, but also guides and assists the arc-extinguishing chamber to divide, cool, and extinguish the arc more quickly, significantly reducing the direct ablation and thermal shock of the arc to the stationary contact.

[0007] This utility model is further configured with locking blocks at both ends of the arc-isolating component.

[0008] This utility model is further configured such that the arc-extinguishing chamber includes two opposing arc-blocking plates and several arc-extinguishing grid plates installed between the two arc-blocking plates. The arc-blocking plates are provided with slots that cooperate with the locking blocks. Through the cooperation of the locking blocks and slots, the arc-blocking components are installed at the bottom of the arc-extinguishing chamber, effectively preventing displacement or loosening of the arc-blocking components under arc impact or equipment vibration, thus ensuring the reliability of its protection of the stationary contacts.

[0009] This utility model is further configured such that the arc-isolating component has a clearance opening for the arc-initiating angle to pass through. The arc-isolating component is fitted onto the outside of the arc-initiating angle through the clearance opening and covers the upper surface of the stationary contact with the arc-initiating opening. Through this fitting structure, the arc-isolating component achieves maximum physical coverage and protection of the upper surface of the stationary contact while providing a precise through-path for the arc-initiating angle. This ensures that both the protective function of the arc-isolating component and the arc-initiating function of the arc-initiating angle are fully realized without interference between them.

[0010] Secondly, this utility model provides a circuit breaker that includes the above-mentioned arc-extinguishing device. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0012] Figure 2 This is a schematic diagram of the static contact assembly according to an embodiment of the present utility model.

[0013] Figure 3 This is an exploded view of the stationary contact assembly according to an embodiment of the present invention. Detailed Implementation

[0014] like Figures 1-3 As shown, an embodiment of this utility model provides an arc extinguishing device, the core components of which include a stationary contact 1, an arc extinguishing chamber 2, and an arc-isolating component 3. The arc extinguishing chamber 2 is located above the stationary contact 1, and the arc-isolating component 3 is disposed between the bottom of the arc extinguishing chamber 2 and the stationary contact 1, with its lower surface completely covering the upper surface of the stationary contact 1, thereby forming a basic protective barrier. Preferably, the arc-isolating component 3 is made of plastic material.

[0015] To ensure the stable installation of the arc-isolating component 3, locking blocks 31 are provided at both ends of the arc-isolating component 3. The arc-extinguishing chamber 2 includes two opposing arc-isolating plates 21 and several arc-extinguishing grid plates 22 fixed therebetween. The arc-isolating plates 21 are provided with slots 211 that cooperate with the locking blocks 31. Through the engagement of the locking blocks 31 and the slots 211, the arc-isolating component 3 is firmly installed at the bottom of the arc-extinguishing chamber 2.

[0016] Furthermore, the stationary contact 1 is provided with an arc-starting opening 11, and an arc-starting angle 12 extending into the arc-extinguishing chamber 2 is installed in the arc-starting opening 11 to guide the arc upward. To adapt to this structure, the arc-blocking member 3 is provided with a clearance opening 32 for the arc-starting angle 12 to pass through. The arc-blocking member 3 is sleeved on the outside of the arc-starting angle 12 through the clearance opening 32 and covers the upper surface of the stationary contact 1 with the arc-starting opening 11. This ensures full coverage of the upper surface of the stationary contact 1 while avoiding structural interference with the arc-starting angle 12 and forming a tight anti-arc fit.

[0017] The arc-extinguishing device constructed as described above can be used in any circuit breaker.

[0018] Of course, in addition to the above embodiments, this utility model may have other various embodiments. Without departing from the essential technical solution of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, and these changes or modifications are equivalent to the technical solution in this patent. Therefore, these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. An arc-extinguishing device, characterized in that: It includes a stationary contact, an arc-extinguishing chamber, and an arc-isolating component. The arc-extinguishing chamber is disposed above the stationary contact, and the arc-isolating component is disposed between the bottom of the arc-extinguishing chamber and the stationary contact, covering the upper surface of the stationary contact.

2. The arc-extinguishing device according to claim 1, characterized in that: The arc-blocking component has locking blocks at both ends.

3. The arc-extinguishing device according to claim 2, characterized in that: The arc-extinguishing chamber includes two opposing arc-blocking plates and several arc-extinguishing grid plates installed between the two arc-blocking plates. The arc-blocking plates are provided with slots that cooperate with the locking block.

4. The arc-extinguishing device according to claim 1, characterized in that: The stationary contact is provided with an arc-initiating opening, and an arc-initiating angle extending into the arc-extinguishing chamber is installed inside the arc-initiating opening.

5. The arc-extinguishing device according to claim 4, characterized in that: The arc-blocking component has a clearance opening for the arc-inducing angle to pass through. The arc-blocking component is fitted onto the outside of the arc-inducing angle through the clearance opening and covers the upper surface of the stationary contact head with the arc-inducing opening.

6. A circuit breaker comprising an arc-extinguishing device according to any one of claims 1-5.

Images