Arc extinguishing system and circuit breaker

Abstract

The invention provides an arc extinguishing system and a circuit breaker, and relates to the technical field of electrical equipment. The arc extinguishing system comprises a base, a static contact assembly and a partition plate assembly. The base is convexly provided with an isolation part, the static contact assembly comprises a static guide plate, a first static contact and two second static contacts which are arranged on the base, the first static contact and the two second static contacts are all connected with the static guide plate, the two second static contacts are arranged on the two sides of the first static contact at intervals, the first static contact is provided with a first static contact point, and the second static contact point is provided with a second static contact point. The ends, away from the static guide plate, of the two second static contacts are provided with second static contacts, and the isolation part is located between the two second static contacts. The partition plate assembly is arranged on the base, the isolation assembly defines an isolation channel, the isolation part is located in the isolation channel, the two second static contacts are located on the two sides of the isolation channel respectively, the isolation effect between the first static contact and the second static contacts is enhanced, and therefore the electrical isolation performance of the circuit breaker is enhanced, and the use stability and safety are improved.

Description

Technical Field

[0001] This invention 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. Summary of the Invention

[0004] This invention provides an arc extinguishing system and a circuit breaker with a reasonable structural design that facilitates the rapid guidance and extinguishing of the electric arc, thereby improving the breaking performance and operational reliability of the circuit breaker.

[0005] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention 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 comprises two baffles, each of which is connected with one of the partitions, and the baffles are located between the first static contact and the second static contact in the extension direction of the first static contact or the second static contact.

[0008] In an optional embodiment, the partition assembly further comprises a connecting piece, two ends of which are connected with the two baffles, respectively.

[0009] In an optional embodiment, the first static contact comprises a first segment and a second segment in a bent structure, one end of the first segment is connected with the static guide plate, the other end extends away from the static guide plate and is connected with the second segment, the other end of the second segment extends towards the static guide plate, and the end is provided with the first static contact point. In the case that the first static contact point is in contact with the moving contact assembly, 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 comprises an arc striking piece, which is connected with the first static contact point.

[0011] In an optional embodiment, the arc extinguishing system further comprises an insulating mounting piece, which is arranged on the static guide plate, one end of the arc striking piece is connected with the first static contact point, and the other end is arranged on the insulating mounting piece.

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

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

[0014] In a second aspect, the application provides a circuit breaker comprising the arc extinguishing system according to any one of the preceding embodiments.

[0015] The arc extinguishing system and the circuit breaker provided by the embodiments of the application have the following beneficial effects: the partition assembly is arranged on the base to form an isolation channel, so that the arc generated at the first static contact point and the first moving contact point of the moving contact assembly is quickly transferred to the arc extinguishing chamber through the isolation channel; and the two second static contact points are located on the two sides of the isolation channel, so that the isolation and arc isolation effects of the two second static contacts are effectively achieved, the isolation portion is located between the two second static contact points, which further strengthens the isolation effect of the two second static contact points and the isolation effect between the first static contact point and the second static contact point, avoids the diffusion of the arc generated in the breaking process from the first static contact point to the two second static contact points, and thus the electrical isolation performance of the circuit breaker is enhanced, and the use stability and safety are improved. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention 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 diagram of the arc extinguishing system provided in an embodiment of the present invention; 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 This is a first-view structural diagram of the static touch component provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the second view structure of the static touch component provided in an embodiment of the present invention; Figure 6 This is a first-view structural diagram of the partition assembly provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the second view structure of the partition assembly provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the insulating mounting component structure provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the arc extinguishing system provided in an embodiment of the present invention, 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] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0021] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0022] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0023] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0024] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0025] As a key device for protecting circuits in power systems, the main function of the circuit breaker is to realize the connection and disconnection of the circuit in normal or fault state, so as to ensure the safe operation of electrical equipment and lines. Among them, the contact system as one of the core components of the circuit breaker, its structural design directly affects the breaking performance, electrical life and operation reliability of the circuit breaker.

[0026] In the prior art, many circuit breakers adopt a combination structure of "short contact + long contact", the short contact carries the working current, and the long contact is used to guide the arc. This structure improves the current carrying capacity and the initial arc guiding effect to a certain extent. However, due to the unreasonable design of the existing contact structure, arc jumping may occur between the contact point of the long contact and the conductive rod and the vicinity of the conductive rod, which affects the breaking speed and stability of the circuit breaker, and may even cause equipment damage or safety accidents.

[0027] Based on the problems existing in the prior art, referring to Figures 1 to 8 The arc extinguishing system 10 provided by the embodiments of the present application is suitable for power protection electrical equipment such as circuit breakers, has a reasonable structure design, is beneficial to the rapid guiding and extinguishing of the arc, improves the overall performance and use safety of the circuit breaker, and meets the demand of modern power systems for high-reliability protection equipment.

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

[0029] The base 100 is provided with an isolation portion 110, the static contact assembly 200 comprises a static guide plate 210, a first static contact 220 and two second static contacts 230 arranged on the base 100, the first static contact 220 and the two second static contacts 230 are connected with the static guide plate 210, the two second static contacts 230 are arranged on the two sides of the first static contact 220 at intervals, the first static contact 220 is provided with a first static contact point 221, the end portions of the two second static contacts 230 away from the static guide plate 210 are each provided with a second static contact point 231, and the isolation portion 110 is located between the two second static contact points 231.

[0030] It can be understood that the static guide plate 210, the first static contact 220 and the two second static contacts 230 can be connected in an integral molding manner.

[0031] The partition assembly 300 is arranged on the base 100, the partition assembly 300 encloses an isolation channel 310, the isolation portion 110 is located in the isolation channel 310, and the two second static contact points 231 are respectively located on the two sides of the isolation channel 310.

[0032] It should be noted that, as Figure 9As shown, the arc extinguishing system 10 further comprises an arc extinguishing chamber 600 and a movable contact assembly 700, the arc extinguishing chamber 600 is provided with an arc extinguishing cavity 610 corresponding to the isolation channel 310. The movable contact assembly 700 is provided with a first movable contact 710 and a second movable contact 720 corresponding to the first stationary contact 220 and the second stationary contact 230, the first movable contact 710 and the second movable contact 720 correspond to the auxiliary circuit and the main circuit respectively, realizing functional partition control and enhancing electrical isolation effect; the first movable contact 710 moves in the isolation channel 310, one end is movably arranged on the base 100, the other end is provided with a first movable contact point and extends into the arc extinguishing cavity 610, one end of the second movable contact 720 is movably arranged on the base 100, the other end is provided with a second movable contact point, and the second movable 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 for clear display of the movable contact assembly 700, Figure 9 The baffle assembly 300 on the left side of the middle is not shown.

[0034] Specifically, the arc extinguishing chamber 600 comprises two spaced gas generating members 620 and a fin group, at least part of the fins in the fin group are composed of a U-shaped structure of a fin abdomen and two fin legs, and the two fin legs are respectively inserted into the two gas generating members 620, so that the two gas generating members 620 and the fin group form the arc extinguishing cavity 610, and the side of the arc extinguishing cavity 610 away from the fin group forms an opening towards the movable contact assembly 700. Among them, the two gas generating members 620 form two side walls of the arc extinguishing cavity 610 respectively and are located on opposite sides of the first movable contact 710 respectively; the end face of the arc extinguishing cavity 610 is the side opposite to the second movable contact 720, that is, the face where the opening of the arc extinguishing cavity 610 towards the movable contact assembly 700 is located. Since the second stationary contact point 231 and the second movable contact point are located outside the arc extinguishing cavity 610, and the first stationary contact point 221 and the first movable contact point are located inside the arc extinguishing cavity 610, the arc generated when the circuit breaker is opened is generated in the arc extinguishing cavity 610.

[0035] When the movable contact assembly 700 contacts the stationary contact assembly 200, the first movable contact 710 and the first stationary contact 220 contact earlier than the second movable contact 720 and the second stationary contact 230 (that is, the auxiliary circuit is connected earlier than the main circuit), and when the movable contact assembly 700 separates from the stationary contact assembly 200, the first movable contact 710 and the first stationary contact 220 separate later than the second movable contact 720 and the second stationary contact 230 (that is, the auxiliary circuit is disconnected later than the main circuit), so that the arc is mainly generated at the first movable contact 710 and the first stationary contact 220, thereby protecting the second stationary contact 230 and the second movable contact 720.

[0036] Therefore, by arranging the partition plate assembly 300 on the base 100 and forming the isolation channel 310, the arc generated between the first stationary contact 221 and the first movable contact can be quickly transferred to the arc extinguishing chamber 610 through the isolation channel 310, and the two second stationary contacts 231 are respectively located on the two sides of the isolation channel 310, so that the isolation and arc separation effects on the two second stationary contacts 230 are effectively achieved, and the isolation part 110 is located between the two second stationary contacts 231, which not only further enhances 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, avoids the diffusion of the arc generated during the breaking process from the first stationary contact 221 to the two second stationary contacts 231, and thus enhances the electrical isolation performance of the circuit breaker and improves the use stability and safety.

[0037] It should be noted that the stationary contact mentioned in the embodiment refers to the part where the stationary contact and the movable contact are in contact, and does not mean that it is a point-shaped structure.

[0038] Further, the partition plate assembly 300 includes two partition plates 320, which are arranged in a spaced manner and enclose the isolation channel 310, and the two partition plates 320 are respectively arranged on the two sides of the isolation part 110, so as to enclose the isolation part 110 in the isolation channel 310, so that the two second stationary contacts 231 are located on the two outer sides of the two partition plates 320 and on the two sides of the isolation part 110, and thus the two second stationary contacts 231 can be effectively isolated by the two partition plates 320 and the isolation part 110, thereby effectively achieving the arc separation effect.

[0039] It should be noted that the outer surface of the partition plate 320 has a set of grooves 321, which can prevent the mold from deforming.

[0040] Of course, in other embodiments of the present application, in order to further increase the electrical isolation effect of the partition plate assembly 300, the partition plate assembly 300 further includes two baffles 330, which are respectively connected with the two partition plates 320, and the baffle 330 is located between the first stationary contact 221 and the second stationary contact 231 in the extension direction of the first stationary contact 220 or the second stationary contact 230.

[0041] In the embodiment, the partition plate 320 and the baffle 330 are connected to form a substantially "Π" shape, and thus the two L-shaped areas enclosed by the two partition plates 320 and the two baffles 330 respectively surround the second stationary contact 231, so that the arc can be effectively prevented from being transferred to the second stationary contact 231.

[0042] Furthermore, in the extension 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, so that the baffle 330 can also effectively isolate the first stationary contact 221 and the second stationary contact 231, thereby further increasing the electrical isolation effect.

[0043] Further, the partition assembly 300 further comprises a connecting piece 340, two ends of the connecting piece 340 are connected with the two baffles 330 respectively.

[0044] In the embodiment, the two baffles 330, the two partitions 320 and the connecting piece 340 can be manufactured by 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 inserted with the base 100, that is, the two partitions 320 are inserted with the base 100, in which case, the bottom of the two partitions 320 is inserted into the insertion slot 120 of the base 100, and the two partitions 320 are tightly attached to the two side walls of the isolation part 110, thereby ensuring that the two partitions 320 are stably installed on the base 100, so as to improve the installation structural stability. The two baffles 330 are arranged on the two second static contacts 230, and the bottom of the two baffles 330 is provided with an insertion part, which is located between the two second static 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 with the base 100 in an integral molding manner, which is not limited here.

[0046] Further, the first static contact 220 comprises a first section 222 and a second section 223 in a bent structure, one end of the first section 222 is connected with the static guide plate 210, the other end extends away from the static guide plate 210 and is connected with the second section 223, the other end of the second section 223 extends towards the static guide plate 210, and the second section 223 is provided with a first static contact point 221 at the end close to the connection with the first section 222; in the case that the first static contact point 221 contacts with the first dynamic contact point of the dynamic contact assembly 700, the current flow direction of the second section 223 is opposite to that of the first section 222.

[0047] Specifically, by designing the first static contact 220 in a bent structure, in the case that the first static contact point 221 contacts with the first dynamic contact point of the dynamic contact assembly 700, the current flow direction of the second section 223 is opposite to that of the first section 222, thereby effectively guiding the arc to move from the isolation channel 310 to the inside of the arc extinguishing chamber 610 during the breaking process of the circuit breaker, accelerating the speed of the arc to separate from the contact area and enter the arc extinguishing chamber 600, thereby improving the arc extinguishing efficiency, and the structure helps to avoid the arc to stay or spread to the non-arc extinguishing area, reduces the risk of arc reignition, and improves the stability and safety of the breaking process of the circuit breaker.

[0048] Further, the arc extinguishing system 10 further comprises an arc leading member 400, which is connected with the first stationary contact 221, so that the arc can be guided by the arc leading member 400 from the isolation channel 310 to the direction of the arc extinguishing chamber 600 during the breaking of the first moving contact and the first stationary contact 221, further improving the arc extinguishing effect.

[0049] Moreover, the arc extinguishing system 10 further comprises an insulating mounting member 500, which is arranged on the static guide plate 210, one end of the arc leading member 400 is connected with the first stationary contact 221, and the other end is arranged on the insulating mounting member 500.

[0050] Specifically, the insulating mounting member 500 is arranged on the static guide plate 210, which plays a positioning role between the arc leading member 400 and the static guide plate 210, and plays a plugging role for the gap between the first stationary contact 220 and the second stationary contact 230, preventing the arc gas from moving downward. One end of the arc leading member 400 is connected with the first stationary contact 221, and the other end is arranged on the insulating mounting member 500.

[0051] It is worth mentioning that the insulating mounting member 500 is also located between the first section 222, the second section 223 and the second stationary contact 230, so as to play a plugging role for the gap between the first section 222, the second section 223 and the second stationary contact 230, reduce the breaking gas from the lower part of the arc extinguishing chamber 610 into the gap between the first section 222, the second section 223 and the second stationary contact 230, and help the breaking gas into the arc extinguishing chamber 600.

[0052] The insulating mounting member 500 has a through hole 510, and the base 100 has a boss, which passes through the through hole 510 and abuts against the second section 223, playing a supporting role for the second section 223.

[0053] Further, the base 100 is provided with at least two isolation parts 110, each of which is correspondingly provided with a static contact assembly 200 and a partition assembly 300, so as to adapt to the use scene of multi-pole breaking demand, thereby improving the adaptability.

[0054] In summary, the arc extinguishing system 10 provided by the embodiment of the present application sets the partition plate assembly 300 on the base 100 and forms the isolation channel 310, so as to facilitate the arc generated by the first stationary contact 221 and the first movable contact to quickly transfer to the arc extinguishing chamber 610 through the isolation channel 310; and the two second stationary contacts 231 are respectively located on the two sides of the isolation channel 310, so as to effectively isolate and arc the two second stationary contacts 230, and 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, avoids the diffusion of the arc generated in the breaking process from the first stationary contact 221 to the two second stationary contacts 231, and thus enhances the electrical isolation performance of the circuit breaker and improves the use stability and safety.

[0055] Further, the embodiment of the present application also provides a circuit breaker comprising the arc extinguishing system 10 in the above-mentioned embodiments. Figures 1-3 As shown in the figure, the circuit breaker is a two-pole circuit breaker formed by leaving the middle phase of a three-phase circuit breaker. The base 100 is provided with two isolation parts 110 corresponding to the two-pole positions, and each isolation part 110 is provided with a stationary contact assembly 200 and a partition plate assembly 300.

[0056] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to 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 arc-extinguishing 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 arc-extinguishing 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 arc-extinguishing 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 arc-extinguishing system (10) according to 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 arc-extinguishing system (10) according to 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 arc-extinguishing 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 arc extinguishing system (10) according to 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 arc-extinguishing system (10) according to 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 in that, Includes the arc extinguishing system (10) as described in any one of claims 1-9.

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