Arc extinguishing system and circuit breaker

Abstract

The invention relates to the technical field of electrical switches, in particular to an arc extinguishing system and a circuit breaker. The arc extinguishing system comprises an arc extinguishing chamber, a contact assembly and an arc isolating assembly; the arc extinguishing chamber is provided with an arc extinguishing cavity; one end, provided with a second movable contact, of the arc contact extends into the arc extinguishing cavity to move and can be in contact with or separated from the static contact; the arc isolating assembly comprises a lifting partition plate arranged between the main contact and the arc contact, the lifting partition plate corresponds to the position of the cavity wall of one side of the arc extinguishing cavity, and the end, provided with the first movable contact, of the main contact moves on the side, away from the arc extinguishing cavity, of the lifting partition plate and can make contact with or be separated from the static contact. The lifting partition plate can ascend when the circuit is switched off and can descend when the circuit is switched on. According to the arc extinguishing system, charged particles in the arc extinguishing cavity can be prevented from overflowing towards the two sides of the contact when the circuit is switched off through the lifting partition plate, but heat dissipation in the arc extinguishing cavity cannot be blocked when the circuit is switched on, so that the arc extinguishing system has the advantages of high breaking capacity and high use safety.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical switches, and more particularly to an arc extinguishing system and a circuit breaker. Background Art

[0002] The arc extinguishing system is one of the key structures of an electrical switch. Generally, the arc extinguishing system includes structures such as a main contact, a static contact, and an arc extinguishing chamber. When the main contact and the static contact are disconnected, an arc will be generated, and the arc generated needs to be cut by the arc extinguishing grid pieces arranged in the arc extinguishing chamber to extinguish the arc. After the moving and static contacts of the existing products are separated, the arc will generate high temperature, causing the internal gas to disperse with some charged particles in the arc extinguishing chamber, and even transfer to the main contact, which may cause the main contact to be punctured in severe cases. Summary of the Invention

[0003] An object of the present invention is to provide an arc extinguishing system to solve the technical problem in the prior art that a large number of charged particles generated when the current is disconnected transfer to the main contact, which may cause the main contact to be punctured in severe cases.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] An arc extinguishing system includes an arc extinguishing chamber, a contact assembly, and an arc separating assembly;

[0006] The arc extinguishing chamber has an arc extinguishing cavity;

[0007] The contact assembly includes a main contact, an arc contact, and a static contact; one end of the arc contact having a second moving contact extends into the arc extinguishing cavity to move and can contact or separate from the static contact;

[0008] The arc separating assembly includes a lifting partition plate arranged between the main contact and the arc contact. The lifting partition plate corresponds to the position of one side wall of the arc extinguishing cavity. One end of the main contact having a first moving contact moves on the side of the lifting partition plate away from the arc extinguishing cavity and can contact or separate from the static contact; the lifting partition plate can rise when the circuit is disconnected and can fall when the circuit is connected.

[0009] Further, the contact assembly further includes a rotating shaft housing, and both ends of the main contact and the arc contact away from the arc extinguishing chamber are installed on the rotating shaft housing; the lifting partition plate is installed on the main contact or the arc contact or the rotating shaft housing.

[0010] Further, the upper part of the lifting partition plate is fixed on one side of the main contact;

[0011] Or, the upper part of the lifting partition plate is fixed on one side of the arc contact;

[0012] Alternatively, one end of the lifting partition plate away from the arc extinguishing chamber is fixed on the outer wall surface of the rotating shaft housing.

[0013] Further, the number of the lifting partition plates is two, and the two lifting partition plates are respectively arranged on both sides of the arc contact and are respectively corresponding to the positions of the two side chamber walls of the arc extinguishing cavity.

[0014] Further, a separating rib plate is connected between the two lifting partition plates, and the separating rib plate is arranged on the side of the arc contact with the second moving contact;

[0015] And / or, an anti-backspray plate is connected between the ends of the two lifting partition plates away from the arc extinguishing chamber.

[0016] Further, the contact assembly further includes an insulating seat, and the insulating seat is arranged below the static contact and at one end of the static contact close to the main contact;

[0017] A first through groove and a second through groove for avoiding the lifting partition plate are respectively arranged on the static contact and the insulating seat.

[0018] Further, limiting plates extending upward and passing over the first through groove are respectively arranged on both sides of the second through groove, and a limiting slideway is formed between the two limiting plates; the two lifting partition plates are located in the limiting slideway, and the two lifting partition plates and the two limiting plates are arranged in one-to-one correspondence, and a corresponding set of lifting partition plate and limiting plate are in contact with each other.

[0019] Further, a limiting protrusion on the limiting plate is slidably arranged in a limiting chute on the corresponding lifting partition plate;

[0020] Alternatively, a limiting protrusion on the lifting partition plate is slidably arranged in a limiting chute on the corresponding limiting plate.

[0021] Further, the distance between the lifting partition plate and the side chamber wall of the arc extinguishing cavity corresponding to it is greater than or equal to 0.1 mm and less than or equal to 2 mm.

[0022] The second object of the present invention is a circuit breaker, including the arc extinguishing system described in any one of the above.

[0023] The beneficial effects of the present invention:

[0024] The present invention provides an arc extinguishing system and a circuit breaker. The arc extinguishing system includes an arc extinguishing chamber, a contact assembly and an arc separating assembly;

[0025] The arc extinguishing chamber has an arc extinguishing cavity;

[0026] The contact assembly includes a main contact, an arcing contact, and a static contact; one end of the arcing contact with a second moving contact extends into the arc extinguishing cavity and moves to be able to contact or separate from the static contact;

[0027] The arc separating assembly includes a lifting partition plate arranged between the main contact and the arcing contact. The lifting partition plate corresponds to the position of one side wall of the arc extinguishing cavity. One end of the main contact with a first moving contact moves on the side of the lifting partition plate away from the arc extinguishing cavity and is able to contact or separate from the static contact; the lifting partition plate can rise when the circuit is disconnected and can descend when the circuit is connected.

[0028] The working principle of the above arc extinguishing system is as follows:

[0029] When the circuit is disconnected, both the main contact and the arcing contact are separated from the static contact. The arc generated after the circuit is disconnected is guided by the arcing contact into the arc extinguishing cavity and extinguished by the arc extinguishing chamber; the lifting partition plate rises in this state. The lifting partition plate blocks most of the charged particles in the arc extinguishing cavity on the side away from the main contact, which can prevent a large number of charged particles from spilling to the first moving contact, thereby improving the current breaking ability of the arc extinguishing system;

[0030] When the circuit is connected, both the main contact and the arcing contact are in contact with the static contact; the lifting partition plate descends in this state. The heat in the arc extinguishing cavity dissipates from the opening of the cavity and dissipates outward from both sides of the lifting partition plate, preventing potential circuit safety hazards such as excessive temperature at the contact points of the arcing contact and the static contact caused by the inability to dissipate heat in time.

[0031] In summary, in this application, the lifting partition plate can block the charged particles in the arc extinguishing cavity from spilling to both sides of the contact, but does not block the heat dissipation in the arc extinguishing cavity when the circuit is connected, enabling the arc extinguishing system to have the advantages of high breaking ability and high use safety. Description of the Drawings

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 It is a schematic structural diagram of the arc extinguishing system provided in Embodiment 1 of the present invention when the circuit is disconnected;

[0034] Figure 2 It is a schematic structural diagram of the arc extinguishing system provided in Embodiment 1 of the present invention when the circuit is connected;

[0035] Figure 3Schematic diagram of the connection structure of the arc extinguishing chamber, static contact, insulating seat and static contact support in the arc extinguishing system provided in the first embodiment of the present invention;

[0036] Figure 4 Schematic diagram of the connection structure of the arc separating component and the arc contact at an angle in the arc extinguishing system provided in the first embodiment of the present invention;

[0037] Figure 5 Schematic diagram of the connection structure of the arc separating component and the arc contact at another angle in the arc extinguishing system provided in the first embodiment of the present invention;

[0038] Figure 6 For Figure 1 Enlarged view at A;

[0039] Figure 7 3D structure diagram of the insulating seat in the arc extinguishing system provided in the first embodiment of the present invention;

[0040] Figure 8 Schematic diagram of the connection structure of the arc separating component and the rotating shaft housing in the arc extinguishing system provided in the third embodiment of the present invention;

[0041] Figure 9 Schematic diagram of the structure of the arc extinguishing system when the circuit is disconnected provided in the third embodiment of the present invention;

[0042] Figure 10 Schematic diagram of the structure of the arc extinguishing system when the circuit is connected provided in the third embodiment of the present invention;

[0043] Figure 11 Schematic diagram of the structure of the rotating shaft housing continuing to rotate after the circuit is connected in the arc extinguishing system provided in the third embodiment of the present invention;

[0044] Figure 12 3D structure diagram of the circuit breaker provided in the fourth embodiment of the present invention.

[0045] Icon:

[0046] 1 - Arc extinguishing chamber; 11 - Arc extinguishing cavity; 12 - Gas generating component; 13 - Grid plate group;

[0047] 2 - Contact component; 21 - Main contact; 211 - First moving contact; 22 - Arc contact; 221 - Second moving contact; 23 - Static contact; 231 - First static contact; 232 - Second static contact; 24 - Rotating shaft housing; 241 - First installation cavity; 242 - Second installation cavity; 25 - Insulating seat; 251 - Limiting plate; 2511 - Limiting protrusion; 252 - Limiting slideway; 26 - Static contact support;

[0048] 3 - Arc separation component; 31 - Lifting partition; 311 - Limit sliding groove; 312 - Fixing part; 313 - Blocking part; 32 - Isolation rib plate; 33 - Anti - backspray plate; 34 - Pin shaft. Detailed implementation mode

[0049] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work belong to the scope of protection of the present invention.

[0050] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0051] It should be noted that in the description of the present invention, the terms "connection" and "installation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or connected through an intermediate medium; it can be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] Embodiment 1

[0053] Embodiment 1 of the present application provides an arc extinguishing system. Refer to Figure 1 , the arc extinguishing system includes an arc extinguishing chamber 1, a contact component 2 and an arc separation component 3;

[0054] The arc extinguishing chamber 1 has an arc extinguishing cavity 11;

[0055] The contact component 2 includes a main contact 21, an arc contact 22 and a static contact 23; One end of the arc contact 22 with a second moving contact 221 extends into the arc extinguishing cavity 11 to move and can contact or separate from the static contact 23;

[0056] The arc separating component 3 includes a lifting partition 31 disposed between the main contact 21 and the arcing contact 22. The lifting partition 31 corresponds to the position of one side wall of the arc extinguishing cavity 11. One end of the main contact 21 having the first moving contact 211 moves on the side of the lifting partition 31 away from the arc extinguishing cavity 11 and can contact or separate from the static contact 23. The lifting partition 31 can rise when the circuit is disconnected and can descend when the circuit is connected.

[0057] The working principle of the above arc extinguishing system is as follows:

[0058] Continue to refer to Figure 1 When the circuit needs to be disconnected, the main contact 21 and the arcing contact 22 are controlled to move until both the main contact 21 and the arcing contact 22 are stably separated from the static contact 23. At this time, the circuit is in the disconnected state, and the arc generated after the circuit is disconnected is guided by the arcing contact 22 into the arc extinguishing cavity 11 and extinguished by the arc extinguishing chamber 1. The lifting partition 31 rises in this state, and the lifting partition 31 blocks most of the charged particles in the arc extinguishing cavity 11 on the side of the lifting partition 31 away from the main contact 21, avoiding a large number of charged particles from spilling to the first moving contact 211, thereby ensuring the reliability of the arc extinguishing system for interrupting current and enhancing the ability of the arc extinguishing system to interrupt current.

[0059] Refer to Figure 2 When the circuit needs to be connected, the main contact 21 and the arcing contact 22 are controlled to move until both the main contact 21 and the arcing contact 22 contact the static contact 23. At this time, the circuit is in the connected state. The lifting partition 31 descends in this state, and the heat in the arc extinguishing cavity 11 dissipates from the opening of the cavity and radiates outward from both sides of the arcing contact 22, preventing the potential safety hazard of the temperature at the contact point between the arcing contact 22 and the static contact 23 being too high due to the failure to dissipate heat in time.

[0060] If the lifting partition 31 does not descend when the circuit is in the connected state, the heat at the contact position between the arcing contact 22 and the static contact 23 is blocked between the two lifting partitions 31 and cannot radiate out from both sides of the arcing contact 22, thus bringing a safety hazard to the circuit. In particular, the arcing contact 22 is mainly responsible for arc initiation and needs to disconnect after the main contact 21 during the circuit disconnection process. If the temperature at the contact position between the arcing contact 22 and the static contact 23 is too high, it may cause the arcing contact 22 and the static contact 23 to be welded together, resulting in the circuit being unable to be disconnected.

[0061] In summary, through the lifting partition 31, the present application can block the charged particles in the arc extinguishing cavity 11 from spilling to both sides of the arcing contact 22, but does not block the heat dissipation in the arc extinguishing cavity 11 after the circuit is connected, enabling the arc extinguishing system to have the advantages of high breaking capacity and high use safety.

[0062] Based on the above structure, the contact assembly 2 further includes a rotating shaft housing 24. One ends of the main contact 21 and the arcing contact 22 away from the arc extinguishing chamber 1 are both installed on the rotating shaft housing 24; the lifting partition 31 is installed on the main contact 21, or the arcing contact 22, or the rotating shaft housing 24. In this application, the lifting partition 31 can move synchronously with the main contact 21, or the arcing contact 22, or the rotating shaft housing 24.

[0063] Combined with Figure 1 and Figure 2 , when it is necessary to connect or disconnect the circuit, the rotating shaft housing 24 is controlled to rotate clockwise or counterclockwise, thereby driving the main contact 21 and the arcing contact 22 installed on the rotating shaft housing 24 to rotate, so as to realize the contact or separation of the main contact 21 and the arcing contact 22 from the static contact 23 respectively; since the lifting partition 31 is installed on one of the main contact 21, the arcing contact 22, and the rotating shaft housing 24, the lifting partition 31 will also rotate up and down together, thereby realizing the rising and falling of the lifting partition 31.

[0064] In other embodiments, a driving structure for driving the lifting partition 31 to rise and fall can also be set separately; however, this solution has defects such as large occupied space, complex structure, and high cost, so it is not preferred.

[0065] Referring to Figure 3 , a first static contact 231 for cooperating with the first moving contact 211 and a second static contact 232 for cooperating with the second moving contact 221 are provided on the static contact 23. Among them, the first static contact 231 is located on the side of the lifting partition 31 away from the arc extinguishing cavity 11, and the second static contact 232 is located in the arc extinguishing cavity 11. In the above structure, the first static contact 231 and the second static contact 232 are separated by the lifting partition 31, so that the charged particles in the arc extinguishing cavity 11 cannot escape to the area where the first static contact 231 is located.

[0066] As an optional embodiment, the number of the lifting partitions 31 is one. The arc extinguishing cavity 11 has two opposite side walls. The lifting partition 31 is located on one side of the arcing contact 22 and its position corresponds to one side wall of the arc extinguishing cavity 11. In this embodiment, the number of the main contacts 21 can be one or more; when the number of the main contacts 21 is multiple, the multiple main contacts 21 are located on the same side of the arcing contact 22.

[0067] As another alternative embodiment, the number of the lifting partition plates 31 is two, and the two lifting partition plates 31 are respectively arranged on both sides of the arc contact 22; the arc extinguishing cavity 11 has two opposite side cavity walls, and the two lifting partition plates 31 respectively correspond to the positions of the two side cavity walls of the arc extinguishing cavity 11. In this embodiment, the number of the main contacts 21 can be one or more; when the number of the main contacts 21 is multiple, the multiple main contacts 21 can be all arranged on the same side of the arc contact 22. At this time, one ends of the multiple main contacts 21 having the first moving contacts 211 are all located on one side of one of the lifting partition plates 31 away from the arc extinguishing cavity 11; in addition, the multiple main contacts 21 can be divided into two groups and respectively arranged in the main contact groups on both sides of the arc contact 22, and the two main contact groups are respectively arranged on one side of the two lifting partition plates 31 away from the arc extinguishing cavity 11.

[0068] Referring to Figure 2 and Figure 3 , the arc extinguishing chamber 1 includes two spaced gas generating parts 12 and a grid plate group 13 arranged between one ends of the two gas generating parts 12. The two gas generating parts 12 and the grid plate group 13 enclose to form the arc extinguishing cavity 11, and the two gas generating parts 12 are respectively the two side cavity walls of the arc extinguishing cavity 11.

[0069] Figure 2 In the illustrated embodiment, the number of the main contacts 21 is four, and two main contacts 21 are respectively arranged on both sides of the arc contact 22; the number of the lifting partition plates 31 is two and respectively corresponds to the positions of the two gas generating parts 12; one ends of the two main contacts 21 on one side of the arc contact 22 having the first moving contacts 211 move on one side of one of the lifting partition plates 31 away from the arc extinguishing cavity 11, one ends of the two main contacts 21 on the other side of the arc contact 22 having the first moving contacts 211 move on one side of the other lifting partition plate 31 away from the arc extinguishing cavity 11, and one end of the arc contact 22 having the second moving contact 221 moves in the arc extinguishing cavity 11.

[0070] Referring to Figure 4 , in this embodiment, the two lifting partition plates 31 are respectively located on both sides of the arc contact 22, and the upper part of each lifting partition plate 31 is fixed on one side of the arc contact 22; the lifting partition plate 31 and the arc contact 22 can be connected by means of clamping, gluing, screwing, etc., which is not limited herein. Exemplarily, the arc separating assembly 3 further includes at least one pin shaft 34. Any one pin shaft 34 penetrates through the arc contact 22, and both ends of any one pin shaft 34 are respectively inserted into the limiting holes on the two lifting partition plates 31, so as to clamp and fix the two lifting partition plates 31 on the arc contact 22.

[0071] In the above structure, the abdomen of the arc contact 22 is clamped between the two lifting partition plates 31, and the lifting partition plates 31 can insulate the abdomen of the arc contact 22, so as to avoid the problem that charged particles break down the arc contact 22 and cause the arc voltage to drop.

[0072] Continue to refer to Figure 4 In the state where the circuit is disconnected, the upper end surface of the lifting partition 31 is located above the second moving contact 221, and the vertical distance L between the second moving contact 221 and the upper end surface of the lifting partition 31 ranges from 4 to 15 mm. It should be noted that the upper end surface of the lifting partition 31 is not limited to a plane or a curved surface; when the upper end surface of the lifting partition 31 is a curved surface, the vertical distance L between the tangent plane at the highest point of the curved surface and the second moving contact 221 ranges from 4 to 15 mm.

[0073] In the state where the circuit is connected, the second moving contact 221 on the arcing contact 22 contacts the static contact 23; since the lifting partition 31 can move synchronously with the arcing contact 22, the vertical distance L between the contact position of the arcing contact 22 and the static contact 23 and the plane where the upper end surface of the lifting partition 31 is located ranges from 4 to 15 mm. This distance hardly hinders the heat at the contact position of the arcing contact 22 and the static contact 23 from dissipating outward from the cavity opening of the arc extinguishing cavity 11.

[0074] Combined with Figure 4 and Figure 5 , an isolation rib plate 32 is connected between the two lifting partitions 31, and the isolation rib plate 32 is arranged on the side of the arcing contact 22 where the second moving contact 221 is located; further, one end of the isolation rib plate 32 extends into the arc extinguishing cavity 11;

[0075] And / or, an anti-backspray plate 33 is connected between the ends of the two lifting partitions 31 far from the arc extinguishing chamber 1.

[0076] In the above structure, the isolation rib plate 32 can insulate the abdomen of the arcing contact 22, thereby avoiding the problem of arc voltage drop caused by charged particles breaking down the arcing contact 22; the anti-backspray plate 33 can play a certain role in blocking charged particles and prevent the problem of reverse breakdown of the gas carrying charged particles. In addition, an arc isolation space for accommodating and isolating charged particles is formed between the two lifting partitions 31, the isolation rib plate 32 and the anti-backspray plate 33. This arc isolation space cooperates with the arc extinguishing cavity 11, so that the gas carrying charged particles generated after the circuit is disconnected is isolated in this arc isolation space and the arc extinguishing cavity 11. Through this arc isolation space, the extrusion of a large amount of gas on the arc extinguishing chamber 1 can be alleviated, the service life of the arc extinguishing chamber 1 can be extended, and it can also prompt the gas carrying charged particles to be discharged outward through the gap between the grid plate groups 13 located behind the arc extinguishing chamber 1, avoiding the problem of the gas carrying charged particles impacting the contacts reversely.

[0077] Based on the above structure, the two lifting partitions 31, the isolation rib plate 32 and the anti-backspray plate 33 are integrally formed.

[0078] Refer to Figure 6, the lifting partition 31 and the side cavity wall of the corresponding arc extinguishing cavity 11 (i.e., the gas generating part 12) are arranged at intervals, and the distance between the two is greater than or equal to 0.1 mm and less than or equal to 2 mm.

[0079] As an example, in combination with Figure 4 , Figure 5 and Figure 6 , the lifting partition 31 includes a connected fixing part 312 and a blocking part 313. The fixing part 312 is fixedly installed on one side of the arc contact 22, the blocking part 313 is arranged below the fixing part 312, and the isolation rib plate 32 is specifically connected between the lower ends of the two fixing parts 312; one end of the fixing part 312 extends into the arc extinguishing cavity 11, and the distance between the side of the fixing part 312 away from the arc contact 22 and the inner side of the side cavity wall of the corresponding arc extinguishing cavity 11 is greater than or equal to 0.1 mm and less than or equal to 2 mm; the blocking part 313 is located outside the arc extinguishing cavity 11 and is arranged opposite to the side cavity wall of the corresponding arc extinguishing cavity 11, and the distance between the blocking part 313 and the side cavity wall of the corresponding arc extinguishing cavity 11 is greater than or equal to 0.1 mm and less than or equal to 2 mm. In this example, since one end of the fixing part 312 extends into the arc extinguishing cavity 11, the protection length of the arc contact 22 can be lengthened, and the problem of arc voltage drop caused by charged particles breaking through the arc contact 22 can be further avoided.

[0080] As another example, the lifting partition 31 is located outside the arc extinguishing cavity 11, and the lifting partition 31 and the side cavity wall of the corresponding arc extinguishing cavity 11 are arranged opposite to each other, and the distance between the lifting partition 31 and the side cavity wall of the corresponding arc extinguishing cavity 11 is greater than or equal to 0.1 mm and less than or equal to 2 mm.

[0081] In the above structure, a narrow gap is formed between the lifting partition 31 and the side cavity wall of the corresponding arc extinguishing cavity 11, and the minimum distance between the two is set to 0.1 mm. This distance can accommodate the machining and assembly errors of each workpiece while not hindering their relative movement; the maximum distance between the lifting partition 31 and the side cavity wall of the corresponding arc extinguishing cavity 11 is set to 2 mm, and most of the charged particles can be blocked on the side of the lifting partition 31 away from the main contact 21, and the concentration of the very small amount of charged particles overflowing from this gap is not enough to cause the problem of breakdown and arcing between the two side contacts.

[0082] It can be understood that in other embodiments, the lifting partition 31 can also be in contact with the side cavity wall of the corresponding arc extinguishing cavity 11; however, this structure requires higher machining and assembly accuracy, so it is not preferred.

[0083] Continuing to refer to Figures 3 to 7 , the contact assembly 2 further includes an insulating seat 25, and the static contact 23 is installed on the insulating seat 25;

[0084] A first through groove and a second through groove for avoiding the lifting partition plate 31 are respectively provided on the static contact 23 and the insulating seat 25.

[0085] On the basis of the above structure, specifically referring to Figure 7 , limiting plates 251 extending upward and passing through the first through groove are respectively provided on both sides of the second through groove, and a limiting slideway 252 is formed between the two limiting plates 251; the two lifting partition plates 31 are located in the limiting slideway 252, and the two lifting partition plates 31 and the two limiting plates 251 are arranged in one-to-one correspondence, and a corresponding set of lifting partition plates 31 and limiting plates 251 are in contact with each other.

[0086] The setting of the limiting slideway 252 can, on the one hand, limit the lateral displacement of the two lifting partition plates 31, avoid the two lifting partition plates 31 from shaking under the impact of air flow, and thus improve the stability of the arc extinguishing system; on the other hand, the limiting slideway 252 can prevent the lifting partition plates 31 from getting stuck at the connection between the static contact 23 and the insulating seat 25 during the movement process.

[0087] Furthermore, a limiting protrusion 2511 on the limiting plate 251 is slidably arranged in a limiting chute 311 on the corresponding lifting partition plate 31;

[0088] or, a limiting protrusion on the lifting partition plate 31 is slidably arranged in a limiting chute on the corresponding limiting plate 251.

[0089] The setting of the limiting protrusion and the limiting chute further limits the position of the lifting partition plate 31 relative to the insulating seat 25, thereby further improving the stability of the arc extinguishing system.

[0090] Continuing to refer to Figure 3 , the contact assembly 2 further includes a static contact support 26, the static contact 23 and the insulating seat 25 are both installed on the static contact support 26, and the insulating seat 25 is arranged between the static contact 23 and the static contact support 26; a third through groove for avoiding the lifting partition plate 31 is provided on the static contact support 26.

[0091] Embodiment 2

[0092] This embodiment provides an arc extinguishing system, and the difference in the structure of this arc extinguishing system from that of Embodiment 1 lies in: the installation method and installation position of the arc separating assembly 3.

[0093] In this embodiment, the upper part of the lifting partition plate 31 is fixed on one side of the main contact 21 adjacent to the arc contact 22, and the two can be connected by means of clamping, gluing, screwing, etc., which is not limited here.

[0094] The connection method between the lifting partition plate 31 and the main contact 21 can refer to the connection method between the lifting partition plate 31 and the arc contact 22 in Embodiment 1, and those skilled in the art can, according to Figure 3 and Figure 4Examples of changing the installation position of the lifting partition plate 31 will not be elaborated here.

[0095] Embodiment III

[0096] This embodiment provides an arc extinguishing system. The difference in the structure of this arc extinguishing system from those of Embodiment I and Embodiment II lies in: the installation method and installation position of the arc separating component 3.

[0097] Refer to Figure 8 In this embodiment, one end of the lifting partition plate 31 far from the arc extinguishing chamber 1 is fixed on the outer wall surface of the rotating shaft housing 24, and the two can be connected by means such as clamping, integral molding, gluing, screwing, etc., without limitation here.

[0098] On the basis of the above structure, the lifting partition plate 31 extends into the rotating shaft housing 24, thereby dividing the interior of the rotating shaft housing 24 into multiple installation cavities, and the main contact 21 and the arc contact 22 are respectively located in different installation cavities. When the number of the lifting partition plates 31 is one, the lifting partition plate 31 divides the interior of the rotating shaft housing 24 into two installation cavities, namely the first installation cavity 241 and the second installation cavity 242; when the number of the lifting partition plates 31 is two, the two lifting partition plates 31 divide the interior of the rotating shaft housing 24 into three installation cavities, namely the second installation cavity 242 and two first installation cavities 241 respectively arranged on both sides of the second installation cavity 242; wherein, one end of the main contact 21 far from the first moving contact 211 extends into the first installation cavity 241, and one end of the arc contact 22 far from the second moving contact 221 extends into the second installation cavity 242. In the above setting, the main contact 21 is entirely located on the side of the lifting partition plate 31 far from the arc contact 22, so that charged particles cannot spill onto the main contact 21, and at the same time, it also prevents the occurrence of electric connection between adjacent main contacts 21 and arc contacts 22, improving the safety of the arc extinguishing system during operation.

[0099] It should be noted that in this embodiment, the side wall of the rotating shaft housing 24 connected to the lifting partition plate 31 is equivalent to the anti-backspray plate 33, which can prevent the problem of reverse breakdown of the air flow.

[0100] In this embodiment, refer to Figures 9 to 11 (The dotted line in the figure represents the arc extinguishing chamber 1). Since the rotating shaft housing 24 can still rotate within a small range after both the arc contact 22 and the main contact 21 are in contact with the static contact 23, the lifting partition plate 31 can rotate with the rotating shaft housing 24 until the end face of the lifting partition plate 31 close to the arc extinguishing chamber 1 is entirely located below the arc extinguishing chamber 1, so that the lifting partition plate 31 will not block the heat in the arc extinguishing cavity 11 from dissipating outward at all.

[0101] Embodiment IV

[0102] This embodiment provides a circuit breaker. Refer to Figure 12, the arc extinguishing system of any of the above embodiments of the circuit breaker.

[0103] The circuit breaker provided by this application can reasonably set the number of arc extinguishing systems according to product specifications and actual usage requirements; exemplarily, Figure 12 In the illustrated embodiment, the circuit breaker includes three arc extinguishing systems distributed in parallel, so as to form a three-pole loop conduction in the phases where the three arc extinguishing systems are located.

[0104] In the circuit breaker provided by this application, referring to Figure 9 , the main contact 21 and the arcing contact 22 are arranged side by side along the rotation axis of the rotating shaft housing 24, and the static contact 23 is arranged below the main contact 21 and the arcing contact 22; one end of the main contact 21 with the first moving contact 211 and one end of the arcing contact 22 with the second moving contact 221 can both move in a direction away from or close to the static contact 23, so that the first moving contact 211 and the second moving contact 221 can respectively contact or separate from the first static contact 231 and the second static contact 232; a lifting partition 31 is respectively arranged on both sides of the arcing contact 22. In the state where the circuit is disconnected, the upper end surface of each lifting partition 31 is located above the second moving contact 221, and the vertical distance L between the second moving contact 221 and the upper end surface of the lifting partition 31 ranges from 4 to 15 mm.

[0105] In the above structure, continue to refer to Figure 9 , in the state where the circuit is disconnected, the lifting partition 31 can separate the first moving contact 211 and the second moving contact 221; referring to Figure 10 , in the state where the circuit is connected, for the embodiment in which the lifting partition 31 is installed on the arcing contact 22 or the main contact 21, since the lifting partition 31 can move synchronously with the arcing contact 22 or the main contact 21, therefore, the vertical distance L between the contact position of the second moving contact 221 and the second static contact 232 and the upper end surface of the lifting partition 31 ranges from 4 to 15 mm, and this distance will not hinder the heat dissipation of the arc extinguishing cavity 11; referring to Figure 11 , in the state where the circuit is connected, for the embodiment in which the lifting partition 31 is installed on the rotating shaft housing 24, since the lifting partition 31 can continue to move downward after the arcing contact 22 contacts the static contact 23, therefore, the end surface of the lifting partition 31 close to the arc extinguishing chamber 1 can move to the lower part of the contact position of the second moving contact 221 and the second static contact 232, so that the lifting partition 31 will not hinder the heat dissipation of the arc extinguishing cavity 11 at all.

[0106] In summary, through the lifting partition 31, this application can block the charged particles in the arc extinguishing cavity 11 from spilling to both sides of the arcing contact 22 after the circuit is disconnected, but will not block the heat dissipation in the arc extinguishing cavity 11 after the circuit is connected, enabling the circuit breaker to have the advantages of high breaking capacity and high usage safety.

[0107] The circuit breaker provided by this application at least has the beneficial effects of the above embodiments, which will not be elaborated here.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An arc extinguishing system, characterized in that, it includes an arc extinguishing chamber (1), a contact assembly (2) and an arc separating assembly (3); the arc extinguishing chamber (1) has an arc extinguishing cavity (11); the contact assembly (2) includes a main contact (21), an arcing contact (22) and a static contact (23); one end of the arcing contact (22) having a second moving contact (221) extends into the arc extinguishing cavity (11) to move and can contact or separate from the static contact (23); the arc separating assembly (3) includes a lifting partition plate (31) disposed between the main contact (21) and the arcing contact (22), the lifting partition plate (31) corresponding to the position of one side wall of the arc extinguishing cavity (11), one end of the main contact (21) having a first moving contact (211) moves on the side of the lifting partition plate (31) away from the arc extinguishing cavity (11) and can contact or separate from the static contact (23); the lifting partition plate (31) can rise when the circuit is disconnected and can descend when the circuit is connected.

2. The arc extinguishing system according to claim 1, characterized in that, the contact assembly (2) further includes a rotating shaft housing (24), and both ends of the main contact (21) and the arcing contact (22) away from the arc extinguishing chamber (1) are mounted on the rotating shaft housing (24); the lifting partition plate (31) is mounted on the main contact (21) or the arcing contact (22) or the rotating shaft housing (24).

3. The arc extinguishing system according to claim 2, characterized in that, the upper part of the lifting partition plate (31) is fixed to one side of the main contact (21); or, the upper part of the lifting partition plate (31) is fixed to one side of the arcing contact (22); or, one end of the lifting partition plate (31) away from the arc extinguishing chamber (1) is fixed to the outer wall surface of the rotating shaft housing (24).

4. The arc extinguishing system according to claim 1, characterized in that, the number of the lifting partition plates (31) is two, and the two lifting partition plates (31) are respectively disposed on both sides of the arcing contact (22) and respectively correspond to the positions of the two side walls of the arc extinguishing cavity (11).

5. The arc extinguishing system according to claim 4, characterized in that, an isolation rib plate (32) is connected between the two lifting partition plates (31), and the isolation rib plate (32) is disposed on the side of the arcing contact (22) having the second moving contact (221); and / or, an anti-backspray plate (33) is connected between the two ends of the two lifting partition plates (31) away from the arc extinguishing chamber (1).

6. The arc extinguishing system according to claim 4, characterized in that, the contact assembly (2) further includes an insulating seat (25), the insulating seat (25) is disposed below the static contact (23) and at one end of the static contact (23) close to the main contact (21); a first through groove and a second through groove for avoiding the lifting partition plate (31) are respectively provided on the static contact (23) and the insulating seat (25).

7. The arc extinguishing system according to claim 6, characterized in that, On both sides of the second through groove, limiting plates (251) extending upward and passing over the first through groove are respectively arranged, and a limiting slideway (252) is formed between the two limiting plates (251); the two lifting partition plates (31) are located in the limiting slideway (252), and the two lifting partition plates (31) are arranged in one-to-one correspondence with the two limiting plates (251), and a corresponding set of the lifting partition plate (31) and the limiting plate (251) are in contact with each other.

8. The arc extinguishing system according to claim 7, characterized in that a limiting protrusion (2511) on the limiting plate (251) is slidably arranged in a limiting chute (311) on the corresponding lifting partition plate (31); or, a limiting protrusion on the lifting partition plate (31) is slidably arranged in a limiting chute on the corresponding limiting plate (251).

9. The arc extinguishing system according to claim 1, characterized in that the distance between the lifting partition plate (31) and the side cavity wall of the arc extinguishing cavity (11) corresponding to its position is greater than or equal to 0.1 mm and less than or equal to 2 mm.

10. A circuit breaker, characterized in that it includes the arc extinguishing system according to any one of claims 1 to 9.

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