Circuit breaker

Abstract

Disclosed in the present invention is a circuit breaker, which comprises: a plastic housing, in which an accommodating chamber is arranged; an operating mechanism and a protection device, which are respectively connected to corresponding positions of the accommodating chamber; a single-break contact system, which comprises: a first movable contact and a second movable contact, which turn on or turn off a circuit by means of a positional relationship; and an arc extinguishing system, which is adjacent to the single-break contact system, and comprises: a first arc extinguishing chamber arranged at one side portion of the accommodating chamber and adjacent to the first movable contact, and a second arc extinguishing chamber arranged at one end portion of the accommodating chamber and adjacent to the second movable contact. The circuit breaker of the present application has better short-circuit current breaking performance and better arc extinguishing effect.

Description

breaker Technical Field

[0001] This application relates to the field of low-voltage electrical technology, and more particularly to circuit breakers for use in the field of low-voltage electrical applications. Background Technology

[0002] As is well known, circuit breakers, as an important electrical product, have overload, short-circuit, and undervoltage protection functions, and are capable of protecting lines and power supplies. Because circuit breakers are used to disconnect and connect load circuits, as well as to cut off faulty circuits, prevent accidents from escalating, and ensure safe operation, they are widely used in the field of low-voltage electrical technology.

[0003] With the continuous development of power grids and the increasing variety of electrical equipment, the breaking performance requirements for molded case circuit breakers (MCCBs) in low-voltage distribution networks are becoming increasingly stringent. In the market, MCBs are generally divided into double-break and single-break products. Compared to double-break products, single-break products have a cost advantage, but they have certain disadvantages in breaking performance. Therefore, those skilled in the art urgently need to develop a new type of circuit breaker to improve the breaking performance of single-break products. Summary of the Invention

[0004] The purpose of this application is to overcome the shortcomings of the existing technology and provide a circuit breaker with better short-circuit current breaking performance and better arc extinguishing effect.

[0005] A circuit breaker according to an embodiment of this application includes: a plastic housing having an internal accommodating chamber; an operating mechanism and a protective device respectively connected to corresponding positions within the accommodating chamber; a single-break contact system including: a first moving contact and a second moving contact, which switch their positional relationship to achieve circuit breaking or connection; an arc-extinguishing system adjacent to the single-break contact system, including a first arc-extinguishing chamber disposed adjacent to the first moving contact on a side of the accommodating chamber; and a second arc-extinguishing chamber disposed adjacent to the second moving contact at an end of the accommodating chamber.

[0006] According to one optional implementation of this application, the first arc-extinguishing chamber and the second arc-extinguishing chamber are adjacent to each other and arranged in an L-shape within the accommodating cavity.

[0007] According to another optional implementation of this application, the arc extinguishing system further includes: a first arc extinguishing channel, which is disposed corresponding to the first moving contact and connected to the first arc extinguishing chamber; and a second arc extinguishing channel, which is disposed corresponding to the second moving contact and connected to the second arc extinguishing chamber.

[0008] According to another alternative implementation of this application, the first moving contact and the second moving contact are rotatably oriented to form a first position for connecting the current and a second position for disconnecting the current.

[0009] According to another optional implementation of this application, the first moving contact is rotatably disposed at a position between the incoming end and the outgoing end of the circuit breaker; the second moving contact is disposed on one side near the incoming end of the circuit breaker and connected to the terminal block of the incoming end of the circuit breaker.

[0010] According to another optional implementation of this application, the first arc-extinguishing channel is located at the upper part of the incoming end of the circuit breaker, and the second arc-extinguishing channel is located at the lower part of the incoming end of the circuit breaker.

[0011] According to another alternative implementation of this application, the first arc-extinguishing channel and the second arc-extinguishing channel are arranged in parallel inside the accommodating cavity.

[0012] According to another optional implementation of this application, the opening angle range formed between the first moving contact and the second moving contact is approximately 0 degrees to 195 degrees.

[0013] According to another optional implementation of this application, one end of the first moving contact is connected to the operating mechanism, and the first moving contact is rotated between 0 degrees and 75 degrees under the drive of the operating mechanism.

[0014] According to another optional implementation of this application, in the event of a short circuit, an electric repulsive force is generated between the first moving contact and the second moving contact, the first moving contact rotates in a first rotation direction, and the second moving contact rotates in a second rotation direction, at which time the maximum breaking distance is formed between the first moving contact and the second moving contact. Attached Figure Description

[0015] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments. Wherein:

[0016] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments. Wherein:

[0017] Figure 1 is a cross-sectional structural schematic diagram of a circuit breaker according to an embodiment of the present application, showing the circuit connection state.

[0018] Figure 2 is a cross-sectional structural schematic diagram of a circuit breaker according to an embodiment of the present application, showing the circuit disconnection state.

[0019] Figure 3 is a schematic diagram of the structure of the first arc-extinguishing chamber of a circuit breaker according to one embodiment of the present application;

[0020] Figure 4 is a schematic diagram of the structure of the second arc-extinguishing chamber of a circuit breaker according to one embodiment of the present application.

[0021] List of reference numerals: Circuit breaker 100, Plastic housing 10, Operating mechanism 11, First moving contact 21, Second moving contact 22, First position L1, Second position L2, First arc extinguishing channel 31, Second arc extinguishing channel 32, First arc extinguishing chamber 41, First arc extinguishing baffle 411, First arc extinguishing grid 412, Second arc extinguishing chamber 42, Second arc extinguishing baffle 421, Second arc extinguishing grid 422, First rotation direction R1, Second rotation direction R2, Incoming terminal 51, Outgoing terminal 52 Detailed Implementation

[0022] To provide a clearer understanding of the technical features, objectives, and effects of this application, specific embodiments of this application are now described with reference to the accompanying drawings. In the drawings, the same reference numerals indicate components with the same or similar structures but the same function.

[0023] In this document, “illustrative” means “serving as an example, illustration or description”, and any illustration or implementation described herein as “illustrative” should not be construed as a more preferred or advantageous technical solution.

[0024] To keep the drawings concise, only the parts relevant to this application are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, components with the same structure or function in some figures are only schematically depicted, or only one or more are labeled. Moreover, the accompanying drawings in this application are only for illustrating and understanding the embodiments of this application and are not intended to limit the scope of this application; they are not necessarily drawn to scale.

[0025] In this patent application, nouns and pronouns relating to people are not limited to specific genders.

[0026] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the positional relationship between related parts, rather than to define their absolute positions.

[0027] In this article, "first," "second," etc., are used only to distinguish them from each other, and do not indicate their importance or order.

[0028] In this paper, terms such as “parallel” and “perpendicular” are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.

[0029] The orientations or positional relationships indicated in the description of this application are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0030] Referring to Figure 1, a cross-sectional view of a circuit breaker according to an embodiment of this application is disclosed, showing the circuit in the connected state. Figure 2 is a cross-sectional view of a circuit breaker according to an embodiment of this application, showing the circuit in the disconnected state. The circuit breaker 100 includes a plastic housing 10, an operating mechanism 11, a protective device, a single-break contact system, and an arc-extinguishing system. Specifically, the plastic housing 10 has an internal accommodating chamber. The operating mechanism 11 and the protective device are respectively connected to corresponding positions in the accommodating chamber. The single-break contact system includes a first moving contact 21 and a second moving contact 22, which achieves circuit disconnection or connection by switching the positional relationship between the first moving contact 21 and the second moving contact 22.

[0031] To better achieve the arc-extinguishing effect of the circuit breaker, the arc-extinguishing system is located adjacent to the single-break contact system. Specifically, the arc-extinguishing system includes a first arc-extinguishing chamber 41 and a second arc-extinguishing chamber 42. The first arc-extinguishing chamber 41 is disposed adjacent to the first moving contact 21 on one side of the receiving chamber. The second arc-extinguishing chamber 42 is disposed adjacent to the second moving contact 22 at one end of the receiving chamber.

[0032] It is worth noting that, as shown in Figures 1 and 2, according to a preferred embodiment of this application, the first arc-extinguishing chamber 41 and the second arc-extinguishing chamber 42 are arranged adjacent to each other and are arranged in an L-shape within the accommodating cavity. It can be understood that, due to the above-mentioned layout design of the first arc-extinguishing chamber 41 and the second arc-extinguishing chamber 42, it can help to accelerate the efficient extinguishing of the arc and further improve the safety arc-extinguishing efficiency of the circuit breaker.

[0033] According to a preferred embodiment of the circuit breaker of this application, the arc extinguishing system further includes: a first arc extinguishing channel 31 and a second arc extinguishing channel 32. The first arc extinguishing channel 31 is disposed corresponding to the first moving contact 21 and connected to the first arc extinguishing chamber 41. Meanwhile, the second arc extinguishing channel 32 is disposed corresponding to the second moving contact 22 and connected to the second arc extinguishing chamber 42.

[0034] As shown in Figure 1, the first moving contact 21 and the second moving contact 22 are rotatably connected to form a first position L1 for connecting the current. As shown in Figure 2, the first moving contact 21 and the second moving contact 22 are rotatably connected to form a second position L2 for disconnecting the current.

[0035] According to a preferred embodiment of this application, the first moving contact 21 is rotatably disposed at a position near the middle of the inlet terminal 51 and the outlet terminal 52 of the circuit breaker, and the second moving contact 22 is disposed on one side near the inlet terminal 51 of the circuit breaker, to achieve a more compact structural design and to meet the performance requirements of more stable circuit interruption and connection. Preferably, one end of the second moving contact 22 is connected to the terminal block of the inlet terminal 51 of the circuit breaker. It is understood that the second moving contact 22 rotates due to the electrodynamic repulsive force emitted by the first stationary contact.

[0036] To achieve better arc extinguishing effect, referring to Figures 1 and 2, it is worth noting that the first arc extinguishing channel 31 is located at the upper part of the incoming terminal 51 of the circuit breaker. The second arc extinguishing channel 32 is located at the lower part of the outgoing terminal 52 of the circuit breaker. Referring to Figure 3, according to an optional embodiment of this application, the first arc extinguishing chamber 41 includes a first arc extinguishing cavity composed of a first arc extinguishing baffle 411, and a plurality of first arc extinguishing grid plates 412 disposed in the first arc extinguishing cavity. Referring to Figure 4, the second arc extinguishing chamber 42 includes a second arc extinguishing cavity composed of a second arc extinguishing baffle 421, and a plurality of second arc extinguishing grid plates 422 disposed in the second arc extinguishing cavity.

[0037] As shown in Figures 1 and 2, one end of the first moving contact 21 is connected to the operating mechanism 11. According to a preferred embodiment of the circuit breaker of this application, under the driving action of the operating mechanism 11, the first moving contact 21 can rotate within the range of 0 degrees to 75 degrees. Furthermore, according to one embodiment of the circuit breaker of this application, the rotation range of the second moving contact 22 is 0 degrees to 120 degrees.

[0038] It is worth noting that, as shown in detail in Figure 2, in the event of a short circuit, an electric repulsive force is generated between the first moving contact 21 and the second moving contact 22. The first moving contact 21 rotates in the first rotation direction R1, and the second moving contact 22 rotates in the second rotation direction R2. At this time, the maximum breaking distance is formed between the first moving contact 21 and the second moving contact 22.

[0039] To further optimize the structural design, according to an optional embodiment of this application, the first arc-extinguishing channel 31 and the second arc-extinguishing channel 32 are arranged in parallel inside the accommodating cavity. Preferably, as shown in FIG1, the achievable opening angle range between the first moving contact 21 and the second moving contact 22 is 0 degrees to 195 degrees. For example, those skilled in the art can set the achievable opening angle between the first moving contact 21 and the second moving contact 22 to 75 degrees, 120 degrees, 195 degrees, or any value between 0 degrees and 195 degrees, depending on the different product requirements. It should be understood that any optional embodiment that can achieve the purpose of this invention is within the protection scope of this patent.

[0040] Specifically, for example, according to one optional embodiment of this application, when the circuit breaker 100 of this application needs to normally disconnect, the maximum achievable opening angle between the first moving contact 21 and the second moving contact 22 can be 75 degrees under the action of the operating mechanism. According to another optional embodiment of this application, when a short circuit fault occurs in the connection line of the circuit breaker 100 of this application, the short circuit current will generate an electric repulsion force between the first moving contact 21 and the second moving contact 22, causing the first moving contact 21 and the second moving contact 22 to repel each other. Since the repulsion distance is the largest at this time, disconnection occurs in the event of a short circuit. Due to the influence of the electric repulsion force, the maximum opening angle between the first moving contact 21 and the second moving contact 22 can be 195 degrees, thus achieving the purpose of rapid current limiting, thereby improving the short circuit breaking performance of the circuit breaker 100. At the same time, after the first moving contact 21 and the second moving contact 22 repel each other, an electric arc will be quickly formed and lengthened. The electric arc in the area of ​​the first moving contact 21 will be discharged and extinguished through the first arc extinguishing channel 31, and the electric arc in the area of ​​the second moving contact 22 will be discharged and extinguished through the second arc extinguishing channel 32, thereby achieving the purpose of quickly extinguishing the electric arc.

[0041] In summary, the circuit breaker of this application employs a design with two moving contacts and two arc-extinguishing channels, which significantly improves the short-circuit breaking performance of the product. Because the circuit breaker uses dual arc-extinguishing channels, it facilitates rapid arc extinguishing, reduces the impact of the arc on the product casing, and improves product safety. Simultaneously, by adopting the dual-moving-contact design of this application, a larger opening distance can be achieved after the two moving contacts repel each other. This means that the larger the short-circuit current, the greater the repulsion distance between the two contacts, thus making the circuit breaker's circuit breaking performance under short-circuit conditions more stable and reliable. Furthermore, since the first and second arc-extinguishing chambers are adjacent to each other and adopt an L-shaped layout design, the efficient extinguishing of the arc can be further accelerated, thus greatly improving the circuit breaker's safe arc-extinguishing efficiency.

[0042] It should be noted that relational terms such as "first" and "second" in this document are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0043] Finally, it should be noted that the above are merely preferred embodiments of this application, used only to illustrate the technical solution of this application, and are not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A circuit breaker (100), characterized in that, include: A plastic shell (10) has an internal accommodating chamber; An operating mechanism (11) and a protective device are respectively connected to the corresponding positions of the accommodating chamber; A single-break contact system, comprising: A first moving contact (21) and a second moving contact (22) switch their positions to disconnect or connect the circuit; and An arc-extinguishing system, adjacent to the single-break contact system, includes: A first arc-extinguishing chamber (41) is disposed adjacent to a side of the receiving chamber, adjacent to the first moving contact (21); and A second arc-extinguishing chamber (42) is disposed adjacent to one end of the receiving chamber.

2. The circuit breaker according to claim 1, characterized in that, The first arc-extinguishing chamber (41) and the second arc-extinguishing chamber (42) are adjacent to each other and arranged in an L-shape within the accommodating cavity.

3. The circuit breaker according to claim 1, characterized in that, The arc-extinguishing system also includes: A first arc-extinguishing channel (31) is provided corresponding to the first moving contact (21) and connected to the first arc-extinguishing chamber (41); and A second arc-extinguishing channel (32) is provided corresponding to the second moving contact (22) and connected to the second arc-extinguishing chamber (42).

4. The circuit breaker according to claim 1, characterized in that, The first moving contact (21) and the second moving contact (22) are rotatably formed to form a first position (L1) for connecting the current and a second position (L2) for disconnecting the current.

5. The circuit breaker according to claim 1, characterized in that, The first moving contact (21) is rotatably disposed at the middle position near the inlet end (51) and outlet end (52) of the circuit breaker; the second moving contact (22) is disposed on one side near the inlet end (51) of the circuit breaker and connected to the terminal block of the inlet end (51) of the circuit breaker.

6. The circuit breaker according to claim 3, characterized in that, The first arc-extinguishing channel (31) is located at the upper part of the incoming end (51) of the circuit breaker, and the second arc-extinguishing channel (32) is located at the lower part of the outgoing end (52) of the circuit breaker.

7. The circuit breaker according to claim 3, characterized in that, The first arc-extinguishing channel (31) and the second arc-extinguishing channel (32) are arranged in parallel inside the accommodating chamber.

8. The circuit breaker according to claim 1, characterized in that, The opening angle range between the first moving contact (21) and the second moving contact (22) is approximately 0 degrees to 195 degrees.

9. The circuit breaker according to claim 1, characterized in that, One end of the first moving contact (21) is connected to the operating mechanism (11), and the first moving contact (21) is rotated between 0 degrees and 75 degrees under the drive of the operating mechanism.

10. The circuit breaker according to claim 1, characterized in that, In the event of a short circuit, an electric repulsive force is generated between the first moving contact (21) and the second moving contact (22). The first moving contact (21) rotates in the first rotation direction (R1), and the second moving contact (22) rotates in the second rotation direction (R2). At this time, the maximum breaking distance is formed between the first moving contact (21) and the second moving contact (22).

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