An arc quenching system and circuit breaker

Abstract

The utility model provides a kind of arc extinguishing system and circuit breaker, it is related to electrical equipment technical field.Arc extinguishing system includes pedestal, static touch component and baffle component.Pedestal is protruded with isolation part, static touch component includes the static guide plate being set to pedestal, first static contact and two second static contacts, first static contact and two second static contacts are connected with static guide plate, two second static contacts are set to the both sides of first static contact with interval, first static contact is provided with first static contact point, and the end portion of two second static contacts away from static guide plate is provided with second static contact point, and isolation part is between two second static contact points;Baffle component is set to pedestal, isolation component encloses isolation passage, isolation part is in isolation passage, two second static contacts are respectively located in the both sides of isolation passage, enhance the isolation effect between first static contact point and second static contact point, to enhance the electrical isolation performance of circuit breaker, improve use stability and security.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and more specifically, to an arc extinguishing system and a circuit breaker. Background Technology

[0002] Circuit breakers, as key devices in power systems used to protect circuits, primarily function to connect and disconnect circuits under normal or fault conditions, thereby ensuring the safe operation of electrical equipment and lines. Among these components, the contact system, as one of the core components of a circuit breaker, directly affects the circuit breaker's breaking performance, electrical life, and operational reliability through its structural design.

[0003] In existing technologies, many circuit breakers employ a combination structure of "short contacts + long contacts," where the short contacts carry the operating current and the long contacts are used to initiate the arc. This structure improves current carrying capacity and initial arc guiding effect to some extent. However, due to unreasonable design of existing contact structures, phenomena such as arc jumping may occur between the long contact and the conductive rod, or in the vicinity of the conductive rod, affecting the circuit breaker's breaking speed and stability, and in severe cases, potentially causing equipment damage or safety accidents. Utility Model Content

[0004] This invention provides an arc extinguishing system and a circuit breaker with a reasonable structural design, which is conducive to the rapid guidance and extinguishing of the electric arc and improves the breaking performance and operational reliability of the circuit breaker.

[0005] The embodiments of this utility model can be implemented as follows: In a first aspect, this utility model provides an arc extinguishing system, comprising: The base has an isolation portion protruding from it; A stationary contact assembly includes a stationary guide plate disposed on the base, a first stationary contact, and two second stationary contacts. The first stationary contact and the two second stationary contacts are both connected to the stationary guide plate. The two second stationary contacts are spaced apart on both sides of the first stationary contact. The first stationary contact is provided with a first stationary contact point. The ends of the two second stationary contacts away from the stationary guide plate are each provided with a second stationary contact point. The isolation portion is located between the two second stationary contacts. A partition assembly is disposed on the base and forms an isolation channel. The isolation part is located in the isolation channel, and the two second stationary contacts are respectively located on both sides of the isolation channel.

[0006] In an optional embodiment, the partition assembly includes two partitions, which are spaced apart and form the isolation channel, and the two partitions are respectively disposed on both sides of the isolation section.

[0007] In an optional embodiment, the partition assembly further includes two baffles, which are respectively connected to the two partitions, and the baffles are located between the first stationary contact and the second stationary contact in the extending direction of the first stationary contact or the second stationary contact.

[0008] In an optional embodiment, the partition assembly further includes a connector, the two ends of which are respectively connected to the two baffles.

[0009] In an optional embodiment, the first stationary contact includes a first segment and a second segment with a bent structure. One end of the first segment is connected to the stationary guide plate, and the other end extends away from the stationary guide plate and is connected to the second segment. The other end of the second segment extends towards the stationary guide plate, and the end is provided with the first stationary contact point. When the first stationary contact is in contact with the moving contact component, the current flow direction of the second segment is opposite to that of the first segment.

[0010] In an optional embodiment, the arc extinguishing system further includes an arc-initiating element connected to the first stationary contact.

[0011] In an optional embodiment, the arc extinguishing system further includes an insulating mounting component disposed on the stationary guide plate, with one end of the arc-initiating component connected to the first stationary contact and the other end disposed on the insulating mounting component.

[0012] In an optional embodiment, the base is provided with at least two isolation sections, each of which is provided with the static contact component and the partition component.

[0013] In an optional embodiment, the partition assembly is detachably connected to the base, or the partition assembly is integrally formed with the base.

[0014] Secondly, this utility model provides a circuit breaker, including an arc extinguishing system as described in any of the foregoing embodiments.

[0015] The beneficial effects of the arc extinguishing system and circuit breaker provided in this utility model embodiment include: by setting the partition assembly on the base and forming an isolation channel, the arc generated at the first stationary contact and the first moving contact of the moving contact assembly can be quickly transferred to the arc extinguishing cavity through the isolation channel; and the two second stationary contacts are respectively located on both sides of the isolation channel, thereby effectively isolating and extinguishing the arc of the two second stationary contacts. Furthermore, the isolation part is located between the two second stationary contacts, which not only further strengthens the isolation effect of the two second stationary contacts, but also enhances the isolation effect between the first stationary contact and the second stationary contact, preventing the arc generated during the breaking process from spreading from the first stationary contact to the two second stationary contacts, thereby enhancing the electrical isolation performance of the circuit breaker and improving its stability and safety in use. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a first-view structural schematic diagram of the arc extinguishing system provided in an embodiment of the present utility model; Figure 2 This is a schematic diagram of the arc extinguishing system from a second perspective, provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of a portion of the arc extinguishing system provided in an embodiment of the present invention; Figure 4 A first-view structural schematic diagram of the static touch component provided in an embodiment of this utility model; Figure 5 This is a schematic diagram of the second-view structure of the static touch component provided in an embodiment of the present utility model; Figure 6 This is a first-view structural schematic diagram of the partition assembly provided in an embodiment of the present utility model; Figure 7 This is a schematic diagram of the second-view structure of the partition assembly provided in an embodiment of the present utility model; Figure 8 This is a schematic diagram of the insulating mounting component structure provided in an embodiment of the present utility model; Figure 9 This is a schematic diagram of the arc extinguishing system provided in this embodiment of the utility model, which includes an arc extinguishing chamber and a moving contact assembly.

[0018] Icons: 10-Arc extinguishing system; 100-Base; 110-Isolation section; 120-Plug-in slot; 200-Static contact assembly; 210-Static guide plate; 220-First static contact; 221-First static contact point; 222-First section; 223-Second section; 230-Second static contact; 231-Second static contact point; 300-Partition assembly; 310-Isolation channel; 320-Partition; 321-Groove; 330-Baffle; 340-Connector; 400-Arc ignition component; 500-Insulation mounting component; 510-Through hole; 600-Arc extinguishing chamber; 610-Arc extinguishing cavity; 620-Gas generating component; 700-Moving contact assembly; 710-First moving contact; 720-Second moving contact. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not 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 utility model.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0025] Circuit breakers, as key devices in power systems used to protect circuits, primarily function to connect and disconnect circuits under normal or fault conditions, thereby ensuring the safe operation of electrical equipment and lines. Among these components, the contact system, as one of the core components of a circuit breaker, directly affects the circuit breaker's breaking performance, electrical life, and operational reliability through its structural design.

[0026] In existing technologies, many circuit breakers employ a combination structure of "short contacts + long contacts," where the short contacts carry the operating current and the long contacts are used to initiate the arc. This structure improves current carrying capacity and initial arc guiding effect to some extent. However, due to unreasonable design of existing contact structures, phenomena such as arc jumping may occur between the long contact and the conductive rod, or in the vicinity of the conductive rod, affecting the circuit breaker's breaking speed and stability, and in severe cases, potentially causing equipment damage or safety accidents.

[0027] Based on the problems existing in the current technology, please refer to Figures 1 to 8 This utility model provides an arc extinguishing system 10, which is suitable for electrical protection equipment such as circuit breakers. Its structure is reasonably designed, which is conducive to the rapid guidance and extinguishing of electric arcs, improves the overall performance and safety of circuit breakers, and meets the needs of modern power systems for high-reliability protection equipment.

[0028] In detail, the arc extinguishing system 10 includes a base 100, a stationary contact assembly 200, and a partition assembly 300.

[0029] The base 100 has a protruding isolation portion 110. The stationary contact assembly 200 includes a stationary guide plate 210, a first stationary contact 220, and two second stationary contacts 230 disposed on the base 100. The first stationary contact 220 and the two second stationary contacts 230 are all connected to the stationary guide plate 210. The two second stationary contacts 230 are spaced apart on both sides of the first stationary contact 220. The first stationary contact 220 is provided with a first stationary contact point 221. The ends of the two second stationary contacts 230 away from the stationary guide plate 210 are each provided with a second stationary contact point 231, and the isolation portion 110 is located between the two second stationary contacts 231.

[0030] It is understandable that the stationary guide plate 210, the first stationary contact 220 and the two second stationary contacts 230 can be connected in a one-piece molding manner.

[0031] The partition assembly 300 is disposed on the base 100, and the partition assembly 300 forms an isolation channel 310. The isolation part 110 is located in the isolation channel 310, and the two second static contacts 231 are respectively located on both sides of the isolation channel 310.

[0032] It should be noted that, as Figure 9As shown, the arc extinguishing system 10 also includes an arc extinguishing chamber 600 and a moving contact assembly 700. The arc extinguishing chamber 600 is provided with an arc extinguishing cavity 610, which corresponds to the isolation channel 310. The moving contact assembly 700 is provided with a first moving contact 710 and a second moving contact 720 corresponding to the first stationary contact 220 and the second stationary contact 230. The first moving contact 710 and the second moving contact 720 correspond to the auxiliary circuit and the main circuit, respectively, to realize functional zone control and enhance the electrical isolation effect. The first moving contact 710 moves in the isolation channel 310, with one end movably disposed on the base 100 and the other end provided with a first moving contact that extends into the arc extinguishing cavity 610. The second moving contact 720 is movably disposed on one end on the base 100 and the other end provided with a second moving contact. The second moving contact 720 is located outside the arc extinguishing chamber 600.

[0033] It is worth mentioning that the baffle assembly 300 is located outside the arc-extinguishing chamber 600, and the moving contact assembly 700 is clearly visible. Figure 9 The partition assembly 300 on the left side is not shown.

[0034] Specifically, the arc-extinguishing chamber 600 includes two spaced-apart gas-generating elements 620 and a grid assembly. At least a portion of the grids in the grid assembly form a U-shaped structure with a grid belly and two grid legs. The two grid legs are respectively inserted into the two gas-generating elements 620. Thus, the two gas-generating elements 620 and the grid assembly enclose an arc-extinguishing cavity 610. The side of the arc-extinguishing cavity 610 away from the grid assembly forms an opening facing the moving contact assembly 700. The two gas-generating elements 620 respectively form the two side walls of the arc-extinguishing cavity 610 and are located on opposite sides of the first moving contact 710. The end face of the arc-extinguishing cavity 610 is the side opposite to the second moving contact 720, that is, the side of the arc-extinguishing cavity 610 facing the moving contact assembly 700. Since the second stationary contact 231 and the second moving contact are located outside the arc-extinguishing cavity 610, while the first stationary contact 221 and the first moving contact are located inside the arc-extinguishing cavity 610, the electric arc generated when the circuit breaker is disconnected is generated inside the arc-extinguishing cavity 610.

[0035] When the moving contact assembly 700 contacts the stationary contact assembly 200, the first moving contact 710 and the first stationary contact 220 contact the second moving contact 720 and the second stationary contact 230 before the second moving contact 720 and the second stationary contact 230 (i.e., the auxiliary circuit is connected before the main circuit). When the moving contact assembly 700 separates from the stationary contact assembly 200, the first moving contact 710 and the first stationary contact 220 separate after the second moving contact 720 and the second stationary contact 230 (i.e., the auxiliary circuit is disconnected after the main circuit). Thus, an electric arc is mainly generated in the first moving contact 710 and the first stationary contact 220 to protect the second stationary contact 230 and the second moving contact 720.

[0036] Therefore, by setting the partition assembly 300 on the base 100 and forming an isolation channel 310, the electric arc generated by the first stationary contact 221 and the first moving contact can be quickly transferred to the arc extinguishing cavity 610 through the isolation channel 310; and the two second stationary contacts 231 are respectively located on both sides of the isolation channel 310, thereby effectively isolating and blocking the two second stationary contacts 230. Furthermore, the isolation part 110 is located between the two second stationary contacts 231, which not only further strengthens the isolation effect of the two second stationary contacts 231, but also enhances the isolation effect between the first stationary contact 221 and the second stationary contact 231, preventing the electric arc generated during the breaking process from spreading from the first stationary contact 221 to the two second stationary contacts 231, thereby enhancing the electrical isolation performance of the circuit breaker and improving its operational stability and safety.

[0037] It should be noted that the static contact mentioned in this embodiment refers to the part where the static contact and the moving contact come into contact, and does not mean that it is a point-like structure.

[0038] Furthermore, the partition assembly 300 includes two partitions 320, which are spaced apart and form an isolation channel 310. The two partitions 320 are respectively disposed on both sides of the isolation portion 110, thereby enclosing the isolation portion 110 within the isolation channel 310. This ensures that the two second stationary contacts 231 are located both on the outer sides of the two partitions 320 and on both sides of the isolation portion 110. Therefore, the two second stationary contacts 231 can be effectively isolated by the two partitions 320 and the isolation portion 110, thereby effectively playing the role of arc isolation.

[0039] It should be noted that there is a set of grooves 321 on the outer surface of the partition 320, which can prevent deformation after demolding.

[0040] Of course, in other embodiments of this utility model, in order to further enhance the electrical isolation effect of the partition assembly 300, the partition assembly 300 also includes two baffles 330, which are respectively connected to the two partitions 320. In the extension direction of the first stationary contact 220 or the second stationary contact 230, the baffles 330 are located between the first stationary contact 221 and the second stationary contact 231.

[0041] In this embodiment, the partition 320 and the baffle 330 are connected in a roughly "Π" shape. Therefore, the two L-shaped areas formed by the two partitions 320 and the two baffles 330 respectively surround the second stationary contact 231, thus effectively preventing the electric arc from transferring to the second stationary contact 231.

[0042] Furthermore, in the extending direction of the first stationary contact 220 and the second stationary contact 230, the baffle 330 is also located between the first stationary contact 221 and the second stationary contact 231. Therefore, the baffle 330 can also effectively isolate the first stationary contact 221 and the second stationary contact 231, further increasing the electrical isolation effect.

[0043] Furthermore, the partition assembly 300 also includes a connector 340, the two ends of which are respectively connected to two baffles 330.

[0044] In this embodiment, the two baffles 330, the two partitions 320, and the connector 340 can be manufactured using an integral molding process, which can not only improve the installation stability and structural strength of the partition assembly 300, but also facilitate assembly and improve installation efficiency.

[0045] It is worth mentioning that the partition assembly 300 is detachably plugged into the base 100, that is, the two partitions 320 are plugged into the base 100. In this case, the bottom of the two partitions 320 is plugged into the insertion slots 120 of the base 100, and the two partitions 320 are in close contact with the side walls of the isolation part 110, thereby ensuring that the two partitions 320 are stably installed on the base 100, thus improving the stability of its installation structure. The two baffles 330 are mounted on the two second stationary contacts 230, and the bottom of the two baffles 330 is provided with a protruding insertion part, which is located between the two second stationary contacts 230 and the second section 223. It can be understood that the partition assembly 300 can also be integrally formed with the base 100, that is, the two partitions 320 can also be connected to the base 100 in an integrally formed manner, which is not specifically limited here.

[0046] Furthermore, the first stationary contact 220 includes a first segment 222 and a second segment 223 with a bent structure. One end of the first segment 222 is connected to the stationary guide plate 210, and the other end extends away from the stationary guide plate 210 and is connected to the second segment 223. The other end of the second segment 223 extends towards the stationary guide plate 210, and a first stationary contact 221 is provided at the end of the second segment 223 near the connection with the first segment 222. When the first stationary contact 221 is in contact with the moving contact assembly 700, the current flow direction of the second segment 223 is opposite to the current flow direction of the first segment 222.

[0047] Specifically, by designing a bent structure for the first stationary contact 220, when the first stationary contact 221 is in contact with the first moving contact of the moving contact assembly 700, the current flow direction of the second segment 223 is opposite to that of the first segment 222. This effectively guides the arc from the isolation channel 310 to the arc-extinguishing chamber 610 during the circuit breaker breaking process, accelerating the speed at which the arc detaches from the contact area and enters the arc-extinguishing chamber 600, thereby improving the arc-extinguishing efficiency. Furthermore, this structure helps to prevent the arc from lingering or spreading to the non-arc-extinguishing area, reducing the risk of arc reignition and improving the stability and safety of the circuit breaker breaking.

[0048] Furthermore, the arc extinguishing system 10 also includes an arc ignition element 400, which is connected to the first stationary contact 221 so that during the disconnection process between the first moving contact and the first stationary contact 221, the arc can be guided from the isolation channel 310 in the direction toward the arc extinguishing chamber 600 through the arc ignition element 400, thereby further improving the arc extinguishing effect.

[0049] Furthermore, the arc extinguishing system 10 also includes an insulating mounting component 500, which is disposed on the stationary guide plate 210. One end of the arc ignition component 400 is connected to the first stationary contact 221, and the other end is disposed on the insulating mounting component 500.

[0050] Specifically, the insulating mounting component 500 is disposed on the stationary guide plate 210, serving to position the arc-initiating component 400 and the stationary guide plate 210, and to seal the gap between the first stationary contact 220 and the second stationary contact 230, preventing the arc gas from moving downwards. One end of the arc-initiating component 400 is connected to the first stationary contact 221, and the other end is disposed on the insulating mounting component 500.

[0051] It is worth mentioning that the insulating mounting component 500 is also located between the first section 222, the second section 223, and the second stationary contact 230 to block the gap between the first section 222, the second section 223, and the second stationary contact 230, thereby reducing the amount of breaking gas entering the gap between the first section 222, the second section 223, and the second stationary contact 230 from the lower part of the arc-extinguishing chamber 610, which helps the breaking gas to enter the arc-extinguishing chamber 600.

[0052] The insulating mounting component 500 has a through hole 510, and the base 100 has a boss. The boss passes through the through hole 510 and abuts against the second section 223, thus providing support for the second section 223.

[0053] Furthermore, the base 100 is provided with at least two isolation sections 110, each isolation section 110 being provided with a static contact component 200 and a partition component 300, in order to adapt to the application scenarios requiring multi-pole disconnection and thereby improve adaptability.

[0054] In summary, this utility model embodiment provides an arc extinguishing system 10. By setting the partition assembly 300 on the base 100 and forming an isolation channel 310, the arc generated by the first stationary contact 221 and the first moving contact is quickly transferred to the arc extinguishing cavity 610 through the isolation channel 310. The two second stationary contacts 231 are respectively located on both sides of the isolation channel 310, thereby effectively isolating and extinguishing the arc of the two second stationary contacts 230. Furthermore, the isolation part 110 is located between the two second stationary contacts 231, which not only further strengthens the isolation effect of the two second stationary contacts 231, but also enhances the isolation effect between the first stationary contact 221 and the second stationary contact 231, preventing the arc generated during the breaking process from spreading from the first stationary contact 221 to the two second stationary contacts 231, thereby enhancing the electrical isolation performance of the circuit breaker and improving its stability and safety.

[0055] Furthermore, this embodiment of the invention also provides a circuit breaker, which includes the arc-extinguishing system 10 as described in the above embodiments. Figures 1-3 As shown, the circuit breaker is a two-pole circuit breaker formed by leaving the middle phase of a three-phase circuit breaker unused. The base 100 is provided with two isolation sections 110 at the positions corresponding to the two poles, and each isolation section 110 is provided with a stationary contact assembly 200 and a partition assembly 300.

[0056] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An arc extinguishing system (10), characterized in that include: The base (100) has an isolation portion (110) protruding from it. A stationary contact assembly (200) includes a stationary guide plate (210), a first stationary contact (220), and two second stationary contacts (230) disposed on the base (100). The first stationary contact (220) and the two second stationary contacts (230) are both connected to the stationary guide plate (210). The two second stationary contacts (230) are spaced apart on both sides of the first stationary contact (220). The first stationary contact (220) is provided with a first stationary contact point (221). The ends of the two second stationary contacts (230) away from the stationary guide plate (210) are each provided with a second stationary contact point (231). The isolation part (110) is located between the two second stationary contacts (231). A partition assembly (300) is disposed on the base (100) and forms an isolation channel (310). An isolation part (110) is located in the isolation channel (310), and two second static contacts (231) are located on both sides of the isolation channel (310).

2. The quenching system (10) according to claim 1, characterized in that The partition assembly (300) includes two partitions (320), which are spaced apart and form the isolation channel (310), and the two partitions (320) are respectively disposed on both sides of the isolation section (110).

3. The quenching system (10) according to claim 2, characterized in that The partition assembly (300) further includes two baffles (330), which are respectively connected to the two partitions (320). In the extension direction of the first stationary contact (220) or the second stationary contact (230), the baffles (330) are located between the first stationary contact (221) and the second stationary contact (231).

4. The quenching system (10) according to claim 3, characterized in that The partition assembly (300) further includes a connector (340), the two ends of which are respectively connected to the two baffles (330).

5. The quenching system (10) of claim 1, characterized in that, The first stationary contact (220) includes a first segment (222) and a second segment (223) with a bent structure. One end of the first segment (222) is connected to the stationary guide plate (210), and the other end extends away from the stationary guide plate (210) and is connected to the second segment (223). The other end of the second segment (223) extends towards the stationary guide plate (210), and the end is provided with the first stationary contact point (221). When the first stationary contact (221) is in contact with the moving contact component, the current flow direction of the second segment (223) is opposite to the current flow direction of the first segment (222).

6. The quenching system (10) of claim 1, characterized in that, The arc extinguishing system (10) further includes an arc-initiating component (400), which is connected to the first stationary contact (221).

7. The quenching system (10) according to claim 6, characterized in that The arc extinguishing system (10) further includes an insulating mounting component (500), which is disposed on the stationary guide plate (210). One end of the arc ignition component (400) is connected to the first stationary contact (221), and the other end is disposed on the insulating mounting component (500).

8. The quenching system (10) of claim 1, characterized in that, The base (100) is provided with at least two isolation sections (110), and each isolation section (110) is provided with the static contact assembly (200) and the partition assembly (300).

9. The quenching system (10) of claim 1, characterized in that, The partition assembly (300) is detachably connected to the base (100), or the partition assembly (300) and the base (100) are integrally formed.

10. A circuit breaker characterized by, Includes the arc extinguishing system (10) as described in any one of claims 1-9.

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