Arc extinguishing system and circuit breaker

Abstract

The invention relates to the technical field of low-voltage switches, in particular to an arc extinguishing system and a circuit breaker. The arc extinguishing system comprises a static contact assembly, a moving contact assembly, a static arc isolating cover and a moving arc isolating cover, wherein the static contact assembly comprises a main static contact and an arc static contact; the moving contact assembly comprises a main moving contact and an arc moving contact. The static arc isolation cover is arranged on the static contact assembly and covers the surface where at least part of the main static contacts are located. The movable arc isolation cover is arranged on the movable contact assembly and comprises an arc isolation protrusion which is arranged between the main movable contact and the arc movable contact to separate the main movable contact and the arc movable contact. According to the arc extinguishing system, the problem of breakdown failure caused by overflow of electric arc and charged particles at the arc moving contact and the static contact is greatly reduced by utilizing the moving arc isolating cover, the insulation at the static contact assembly is enhanced by utilizing the static arc isolating cover, and the problem of breakdown failure is avoided by performing insulation protection on the moving contact assembly and the static contact assembly, so that the service life of the arc extinguishing system is prolonged. And the breaking performance and the arc extinguishing capability of the arc extinguishing system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage switches, and in particular to an arc extinguishing system and a circuit breaker. Background Art

[0002] The arc extinguishing system is one of the key structures of electrical switches. 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 plates arranged in the arc extinguishing chamber to extinguish the arc.

[0003] During the breaking process of the conventional arc extinguishing system, under high temperature and high pressure, arc particles are emitted randomly. Although there are means such as magnetic blowing and air blowing to introduce the arc into the arc extinguishing chamber, a large number of charged particles still accumulate between the moving and static contacts, which easily causes arc breakdown. Moreover, under the working conditions of high voltage, arc breakdown becomes easier, exacerbating the failure phenomenon that the arc cannot be extinguished after breaking. Summary of the Invention

[0004] The first object of the present invention is to provide an arc extinguishing system to solve the technical problem that charged particles accumulated between the moving and static contacts in the prior art easily cause arc breakdown.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An arc extinguishing system includes a static contact assembly, a moving contact assembly, a static arc isolating cover, and a moving arc isolating cover, wherein:

[0007] The static contact assembly includes a main static contact and an arc static contact;

[0008] The moving contact assembly includes a main moving contact for contacting or separating from the main static contact and an arc moving contact for contacting or separating from the arc static contact;

[0009] The static arc isolating cover is arranged on the static contact assembly and covers at least part of the surface where the main static contact is located;

[0010] The moving arc isolating cover is arranged on the moving contact assembly, and the moving arc isolating cover includes an arc isolating protrusion arranged between the main moving contact and the arc moving contact to separate the two.

[0011] Further, the static contact assembly further includes a static conducting rod, and the main static contact and the static arc isolating cover are both arranged on the static conducting rod.

[0012] Further, the static arc isolating cover covers one end of the static conducting rod where the main static contact is arranged, and a first avoidance hole or a first avoidance groove for the main static contact to penetrate is opened on the static arc isolating cover;

[0013] And / or, the static contact assembly further includes a static arcing piece disposed on the static conductive rod, the static arcing contact point is disposed on the static arcing piece, and the static arc shielding cover further covers at least a part of the static arcing piece;

[0014] And / or, a second avoidance groove or a second avoidance hole or an avoidance passage for the arc separating protrusion to shuttle through is formed on the static arc shielding cover;

[0015] And / or, a core arc separating surface is provided on the static arc shielding cover, and the core arc separating surface covers the upper side of the surface where the main static contact point on the static conductive rod is located and is lower than the surface of the main static contact point contacting the moving main contact.

[0016] Furthermore, the moving contact assembly further includes a contact support member, the moving main contact and the arcing moving contact are arranged side by side on the contact support member, and the moving arc shielding cover is installed on the contact support member.

[0017] Furthermore, a region for accommodating the moving main contact and the arcing moving contact is formed by surrounding between the moving arc shielding cover and the contact support member;

[0018] And / or, an installation slot is provided on the contact support member, and the arc separating protrusion is inserted into the installation slot;

[0019] And / or, the moving arc shielding cover includes a U-shaped housing, the arc separating protrusion is connected between the U-shaped housing and the contact support member, and the region formed by surrounding the U-shaped housing and the contact support member is divided into a first region and a second region, wherein the first region is used for accommodating the moving main contact, and the second region is used for accommodating the arcing moving contact;

[0020] And / or, a rib plate is provided on the contact support member, and the rib plate is disposed between the moving main contact and the arcing moving contact.

[0021] Furthermore, the number of the arc separating protrusions is two, and they are respectively disposed on both sides of the arcing moving contact perpendicular to the plane where its movement track is located; the moving arc shielding cover further includes a baffle plate connected between the two arc separating protrusions.

[0022] Furthermore, an arc extinguishing chamber is further included, the arc extinguishing chamber has an arc extinguishing cavity, the main static contact point and the moving main contact are both disposed outside the arc extinguishing cavity, the static arcing contact point is disposed inside the arc extinguishing cavity, and one end of the arcing moving contact for contacting the static arcing contact point is always disposed inside the arc extinguishing cavity during the movement process.

[0023] Further, the arc extinguishing chamber includes two gas generating members and a grid plate group arranged at intervals, and the two gas generating members and the grid plate group enclose to form the arc extinguishing cavity; wherein, the two gas generating members respectively form two side walls of the arc extinguishing cavity and are respectively located on opposite sides of the moving arc contact.

[0024] Further, the static arc isolating cover extends from the static contact assembly towards the arc extinguishing chamber and probes into the arc extinguishing chamber;

[0025] And / or, an avoidance arc surface is arranged on one side of the arc extinguishing chamber close to the moving main contact, the center of the arc of the avoidance arc surface is the rotation center of the static contact assembly, and one end of the moving main contact contacting the main static contact is arranged opposite to the avoidance arc surface.

[0026] Further, the arc isolating protrusion extends from the moving contact assembly towards the arc extinguishing chamber;

[0027] One end of the arc isolating protrusion close to the arc extinguishing chamber is placed in the arc extinguishing cavity and cooperates with the two side walls of the arc extinguishing cavity, or one end of the arc isolating protrusion close to the arc extinguishing chamber cooperates with the end face of the arc extinguishing cavity.

[0028] Further, a limiting sliding groove is arranged on the end face of the arc extinguishing cavity, and the arc isolating protrusion is inserted into the limiting sliding groove.

[0029] The second object of the present invention is to provide a circuit breaker, and the circuit breaker includes the arc extinguishing system described in any one of the above.

[0030] The beneficial effects of the present invention are as follows:

[0031] The present invention provides an arc extinguishing system and a circuit breaker. The arc extinguishing system includes a static contact assembly, a moving contact assembly, a static arc isolating cover, and a moving arc isolating cover, wherein: the static contact assembly includes a main static contact and an arc static contact; the moving contact assembly includes a moving main contact for contacting or separating from the main static contact and an arc moving contact for contacting or separating from the arc static contact; the static arc isolating cover is arranged on the static contact assembly and covers at least part of the surface where the main static contact is located; the moving arc isolating cover is arranged on the moving contact assembly, and the moving arc isolating cover includes an arc isolating protrusion arranged between the moving main contact and the arc moving contact to separate the two. This arc extinguishing system greatly reduces the breakdown failure problem caused by the arc and the overflow of charged particles at the moving and static arc contacts by using the moving arc isolating cover. At the same time, the static arc isolating cover is used to strengthen the insulation at the static contact assembly. By insulating and protecting both the moving and static contact assemblies, the problem of breakdown failure is avoided, and the breaking performance and arc extinguishing ability of the arc extinguishing system are improved. Description of the Drawings

[0032] 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 the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0033] Figure 1 It is a three-dimensional schematic diagram of the arc extinguishing system provided in the first embodiment of the present invention at an angle;

[0034] Figure 2 It is a cross-sectional schematic diagram of the arc extinguishing system provided in the first embodiment of the present invention;

[0035] Figure 3 It is an assembly schematic diagram of the static contact assembly, static arc shield, moving contact assembly, and moving contact cover provided in the first embodiment of the present invention;

[0036] Figure 4 It is a three-dimensional schematic diagram of the static contact assembly provided in the first embodiment of the present invention;

[0037] Figure 5 It is a three-dimensional schematic diagram of the static arc shield provided in the first embodiment of the present invention at an angle;

[0038] Figure 6 It is a three-dimensional schematic diagram of the static arc shield provided in the first embodiment of the present invention at another angle;

[0039] Figure 7 It is a three-dimensional schematic diagram of the moving contact assembly and the moving contact cover after being buckled together provided in the first embodiment of the present invention;

[0040] Figure 8 It is a three-dimensional schematic diagram of the moving contact assembly provided in the first embodiment of the present invention;

[0041] Figure 9 It is a three-dimensional schematic diagram of the moving contact cover provided in the first embodiment of the present invention;

[0042] Figure 10 It is a three-dimensional schematic diagram of the contact support provided in the first embodiment of the present invention;

[0043] Figure 11 It is a three-dimensional schematic diagram of the arc extinguishing system provided in the first embodiment of the present invention at another angle;

[0044] Figure 12 It is a three-dimensional schematic diagram of the arc extinguishing chamber provided in the first embodiment of the present invention;

[0045] Figure 13 It is a three-dimensional schematic diagram of the static arc shield provided in the second embodiment of the present invention at an angle;

[0046] Figure 14 A three-dimensional schematic diagram of the static arc isolation cover provided in the second embodiment of the present invention from another angle;

[0047] Figure 15 A cross-sectional view of the static contact assembly, moving contact assembly, static arc isolation cover, and moving arc isolation cover provided in the second embodiment of the present invention in an assembled state;

[0048] Figure 16 is Figure 15 An enlarged view of part A in

[0049] Figure 17 A three-dimensional schematic diagram of the static arc isolation cover provided in the third embodiment of the present invention;

[0050] Figure 18 A cross-sectional view of the static contact assembly, moving contact assembly, static arc isolation cover, and moving arc isolation cover provided in the third embodiment of the present invention in an assembled state;

[0051] Figure 19 is Figure 18 An enlarged view of part B in

[0052] Icon:

[0053] 1 - Static contact assembly; 11 - Static conductive rod; 12 - Main static contact; 13 - Arc static contact; 14 - Static arc guiding piece; 141 - Third avoidance groove; 2 - Moving contact assembly; 21 - Contact support; 211 - Installation slot; 212 - Rib plate; 213 - Rotating shaft limit groove; 22 - Active contact; 23 - Arc moving contact; 24 - Rotating shaft; 3 - Static arc isolation cover; 31 - First avoidance hole; 32 - Second avoidance groove; 33 - Core arc isolation surface; 34 - Second avoidance hole; 35 - Matching arc plate; 36 - Avoidance channel; 4 - Moving arc isolation cover; 41 - Arc isolation protrusion; 42 - U-shaped housing; 43 - Baffle; 5 - Arc extinguishing chamber; 51 - Arc extinguishing cavity; 52 - Avoidance arc surface. Detailed implementation manners

[0054] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are 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, and therefore cannot be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. 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.

[0055] Embodiment 1

[0056] During the breaking process of the conventional arc extinguishing system, the charged particles accumulated between the moving and static contacts are likely to cause arc breakdown, resulting in the failure phenomenon that the arc cannot be extinguished after breaking.

[0057] Based on this, Embodiment 1 of the present application provides an arc extinguishing system. Referring to Figures 1 to 3 , the arc extinguishing system includes a static contact assembly 1, a moving contact assembly 2, a static arc shield 3, and a moving arc shield 4, where: the static contact assembly 1 includes a main static contact 12 and an arc static contact 13; the moving contact assembly 2 includes a main moving contact 22 for contacting or separating from the main static contact 12 and an arc moving contact 23 for contacting or separating from the arc static contact 13; the static arc shield 3 is disposed on the static contact assembly 1 and covers at least part of the surface where the main static contact 12 is located; the moving arc shield 4 is disposed on the moving contact assembly 2, and the moving arc shield 4 includes an arc separating protrusion 41 disposed between the main moving contact 22 and the arc moving contact 23 to separate the two. Specifically, the main moving contact 22 has a main moving contact for contacting or separating from the main static contact 12, and the arc moving contact 23 has an arc moving contact for contacting or separating from the arc static contact 13; in most cases, the main moving and static contacts are silver alloy contacts, and the arc moving and static contacts are silver-copper alloy contacts.

[0058] The arc extinguishing system provided by this application includes an arc moving contact 23, whose main function is to bear the arc generated during the opening and closing of the circuit breaker. The specific working principle of the arc moving contact 23 is as follows: when the circuit breaker opens, the moving contact assembly 2 moves relative to the static contact assembly 1. During the movement, the arc moving contact 23 separates from the static contact assembly 1 later than the main moving contact 22, so that an arc is generated on the arc moving contact 23, thus achieving the purpose of protecting the main moving contact 22; when the circuit breaker closes, the moving contact assembly 2 moves relative to the static contact assembly 1. During the movement, the arc moving contact 23 contacts the static contact assembly 1 earlier than the main moving contact 22, thus avoiding the generation of an arc at the main contact.

[0059] This arc extinguishing system includes a static arc isolating cover 3 and a moving arc isolating cover 4 made of insulating materials; after the circuit is disconnected, since the arc moving contact 23 separates from the static contact assembly 1 later than the main moving contact 22, the arc and charged particles gather between the arc static contact 13 and the arc moving contact 23. Also, since the main moving contact 22 and the arc moving contact 23 are separated by an arc isolating protrusion 41, the arc isolating protrusion 41 can block the arc and charged particles at the arc moving contact 23, preventing the arc and charged particles from transferring from the arc moving contact 23 to the main moving contact 22. In this way, although a large number of charged particles gather between the arc moving and static contacts, these charged particles cannot move between the main and static contacts under the blockage of the arc isolating protrusion 41, thus avoiding the breakdown of the main and static contacts to generate an arc and improving the breaking performance; at the same time, the static arc isolating cover 3 covers at least part of the surface where the main static contact 12 is located, and it can provide insulation protection for one end of the static contact assembly 1 close to the moving contact assembly 2, further reducing the arc breakdown caused by tip discharge. In summary, this arc extinguishing system uses the moving arc isolating cover 4 to greatly reduce the breakdown failure problem caused by the overflow of the arc and charged particles at the arc moving and static contacts, and at the same time uses the static arc isolating cover 3 to strengthen the insulation at the static contact assembly 1. By providing insulation protection for both the moving and static contact assemblies, the problem of breakdown failure is avoided, and the breaking performance and arc extinguishing ability of the arc extinguishing system are improved.

[0060] Refer to Figure 4 As shown in, the static contact assembly 1 further includes a static conducting rod 11, and the main static contact 12 and the static arc isolating cover 3 are both arranged on the static conducting rod 11. Among them, the main static contact 12 is fixed on the static conducting rod 11 by means such as riveting, welding, and inlaying, and the static arc isolating cover 3 is fixed on the static conducting rod 11 by means such as clamping and fastener connection. The static conducting rod 11 has two functions. One is to connect the main static contact 12 to the external circuit, and the other is to support the main static contact 12 and the static arc isolating cover 3. In addition, the static arc isolating cover 3 can be attached to the static conducting rod 11 or have a certain gap with the static conducting rod 11, as long as it can achieve the effect of avoiding breakdown failure of the static contact.

[0061] Optionally, the static arc-isolating cover 3 can be installed on the static conductive rod 11 or on the circuit breaker housing. Preferably, the static arc-isolating cover 3 is installed on the static conductive rod 11 and fits on the static conductive rod 11.

[0062] Reference Figure 4 and Figure 5 , based on the static contact assembly 1 including the static conductive rod 11, as an optional embodiment:

[0063] The static arc-isolating cover 3 covers one end of the static conductive rod 11 provided with the main static contact 12, and the static arc-isolating cover 3 is provided with a first avoidance hole 31 or a first avoidance groove for the main static contact 12 to pass through;

[0064] And / or, the static contact assembly 1 further comprises a static arc-striking piece 14 arranged on the static conductive rod 11, the arc static contact 13 is arranged on the static arc-striking piece 14, and the static arc-isolating cover 3 further covers at least a part of the static arc-striking piece 14;

[0065] And / or, the static arc isolation cover 3 is provided with a second avoidance hole or a second avoidance groove 32 for the arc isolation protrusion 41 to pass through;

[0066] And / or, a core arc isolation surface 33 is provided on the static arc isolation cover 3, and the core arc isolation surface 33 covers the surface above the main static contact 12 on the static conductive rod 11 and is lower than the surface of the main static contact 12 contacting the active contact 22.

[0067] In some embodiments, a main static contact 12 is provided on the end surface of one end of the static conductive rod 11, and the other end of the static conductive rod 11 is connected to an external circuit. The static arc-isolating cover 3 covers the end of the static conductive rod 11 where the main static contact 12 is provided. In order to prevent the main static contact 12 from being covered in the static arc-isolating cover 3 and unable to contact the active contact 22, a first avoidance hole 31 is provided on the static arc-isolating cover 3, and the main static contact 12 passes through the first avoidance hole 31; of course, the first avoidance hole 31 can be replaced by a slot structure. The surface where the first avoidance hole 31 on the static arc-isolating cover 3 is located (i.e., the core arc-isolating surface 33) should be lower than the side of the main static contact 12 that contacts the active contact 22, so as not to hinder the contact between the main static contact 12 and the active contact 22.

[0068] In some embodiments, the motion paths of the static arc shield 3 and the arc shield protrusion 41 are staggered. In other embodiments, the static arc shield 3 is located on the motion path of the arc shield protrusion 41. For the embodiment where the static arc shield 3 is located on the motion path of the arc shield protrusion 41, as shown in FIG. Figure 5 As shown, in order to prevent the static arc isolation cover 3 from hindering the movement of the arc isolation protrusion 41, a second avoidance groove 32 for the arc isolation protrusion 41 to pass through is opened on the static arc isolation cover 3; of course, the second avoidance groove 32 can be replaced by a hole structure.

[0069] In some embodiments, continue to refer to Figure 4, the static contact assembly 1 further includes a static arcing contact piece 14 disposed on the static conductive rod 11. One end of the static arcing contact piece 14 is connected to one end of the static conductive rod 11 provided with the main static contact 12 through a fastener, and the other end thereof extends in a direction away from the main static contact 12; the arcing static contact 13 is fixedly disposed on the static arcing contact piece 14 by means of riveting, welding, embedding, etc. At least a part of the static arcing contact piece 14 located between the main static contact 12 and the arcing static contact 13 is covered by the static arc shield 3. By separating the static arcing contact piece 14 from the moving contact assembly 2 through the static arc shield 3, it can prevent the electric arc and charged particles from transferring to the main static contact 12 through the static arcing contact piece 14, and prevent the static arcing contact piece 14 from being eroded by the electric arc and charged particles generated when the current is interrupted, thus extending the service life of the static arcing contact piece 14.

[0070] Further, the static arcing contact piece 14 is generally located on the movement path of the arc separating protrusion 41. In order to prevent the static arcing contact piece 14 from obstructing the movement of the arc separating protrusion 41, a third avoidance groove 141 for the arc separating protrusion 41 to pass through is formed on the static arcing contact piece 14; of course, the third avoidance groove can be replaced with a hole structure. In an embodiment where a part of the static arcing contact piece 14 is covered by the static arc shield 3, the third avoidance groove 141 overlaps with the second avoidance groove 32.

[0071] In an embodiment provided with the static arcing contact piece 14 and the core arc separating surface 33, the core arc separating surface 33 covers at least a part of the static arcing contact piece 14. In a specific embodiment, refer to Figure 5 and Figure 6 , the static arc shield 3 includes a horizontal cover plate and a plurality of vertical cover plates erected on the periphery of the horizontal cover plate. A protection area is formed by enclosing between the horizontal cover plate and the vertical cover plates. One end of the static conductive rod 11 provided with the main static contact 12 and one end of the static arcing contact piece 14 close to the main static contact 12 are both covered in this protection area. A first avoidance hole 31 and a second avoidance groove 32 are formed on the horizontal cover plate. Among them, the main static contact 12 passes through the first avoidance hole 31 to contact or separate from the main moving contact 22, and the arc separating protrusion 41 shuttles in the second avoidance groove 32 during the opening and closing processes of the circuit breaker.

[0072] Refer to Figure 7 and Figure 8 , the moving contact assembly 2 further includes a contact support 21. The main moving contact 22 and the arcing moving contact 23 are arranged side by side on the contact support 21, and the moving arc shield 4 is installed on the contact support 21. The number of the main moving contacts 22 and the arcing moving contacts 23 can both be one, two or more; generally, the number of the main moving contacts 22 is multiple and greater than the number of the arcing moving contacts 23. The multiple main moving contacts 22 are evenly divided into two groups and are respectively arranged on both sides of the arcing moving contact 23 perpendicular to the plane where its movement trajectory is located. The moving arc shield 4 is fixed on the contact support 21 by means of clamping, fastener connection, etc.; during the movement of the contact support 21, the moving arc shield 4 moves synchronously with the contact support 21.

[0073] In the embodiment where the main contacts 22 are provided on both sides of the arc moving contact 23, the number of the arc separating protrusions 41 is also two. One, two or more arc moving contacts 23 are provided between the two arc separating protrusions 41, and a plurality of main contacts 22 are provided on one side of each arc separating protrusion 41 away from the arc moving contact 23.

[0074] On the basis that the moving contact assembly 2 includes a contact support 21, as an alternative embodiment:

[0075] A region for accommodating the main contacts 22 and the arc moving contacts 23 is formed by enclosing between the moving arc shield 4 and the contact support 21;

[0076] And / or, an installation slot 211 is provided on the contact support 21, and the arc separating protrusion 41 is inserted into the installation slot 211;

[0077] And / or, the moving arc shield 4 includes a U-shaped housing 42, and the arc separating protrusion 41 is connected between the U-shaped housing 42 and the contact support 21, and divides the region formed by enclosing the U-shaped housing 42 and the contact support 21 into a first region and a second region. Among them, the first region is used to accommodate the main contacts 22, and the second region is used to accommodate the arc moving contacts 23;

[0078] And / or, a rib plate 212 is provided on the contact support 21, and the rib plate 212 is provided between the main contacts 22 and the arc moving contacts 23.

[0079] Referring to Figure 9 and Figure 10 In some embodiments, the moving arc shield 4 includes a U-shaped housing 42, and the contact support 21 is also generally U-shaped. The open ends of the U-shaped housing 42 and the contact support 21 face each other and are buckled, and the main contacts 22 and the arc moving contacts 23 are located between the moving arc shield 4 and the contact support 21. One end of the arc separating protrusion 41 is fixed to the inner end face of the closed end of the U-shaped housing 42, and the other end of the arc separating protrusion 41 contacts the inner end face of the closed end of the contact support 21, so as to divide the region formed by enclosing the U-shaped housing 42 and the contact support 21 into a first region and a second region. Among them, the first region is used to accommodate the main contacts 22, and the second region is used to accommodate the arc moving contacts 23, and the main contacts 22 and the arc moving contacts 23 are separated by the arc separating protrusion 41. Further, in order to improve the connection stability of the contact position between the arc separating protrusion 41 and the contact support 21, an installation slot 211 is provided on the inner end face of the closed end of the contact support 21, and the arc separating protrusion 41 is inserted into the installation slot 211.

[0080] Optionally, the moving arc shield 4 and the contact support 21 are fixed by one or more of the following methods: connection through shaft holes, snap connection, connection by fasteners (such as screws, pins, etc.). In addition, the moving arc shield 4 as a whole can be made by an integral molding process, or the components of the moving arc shield 4 can be joined together into a whole by snap connection, connection by fasteners, etc.

[0081] In some embodiments, with continued reference to Figure 10 , a rib plate 212 is provided on the contact support 21, and the rib plate 212 is disposed between the main moving contact 22 and the arcing moving contact 23. The main moving contact 22 and the arcing moving contact 23 are positioned by the rib plate 212, preventing axial movement of each moving contact relative to the contact support 21 during rotation, and improving the positioning accuracy of each moving contact. In an embodiment where the main moving contacts 22 are provided on both sides of the arcing moving contact 23, the number of rib plates 212 is also two, and one, two or more arcing moving contacts 23 are provided between the two rib plates 212; a number of main moving contacts 22 are provided on the side of each rib plate 212 away from the arcing moving contact 23.

[0082] Further, the moving contact assembly 2 further includes a rotating shaft 24 provided on the contact support 21, and the main moving contact 22 and the arcing moving contact 23 are sleeved side by side on the rotating shaft 24; a rotating shaft limiting groove 213 is provided on the rib plate 212, and a part of the rotating shaft 24 is embedded in the rotating shaft limiting groove 213. The position of the rotating shaft 24 relative to the contact support 21 can be limited by the rotating shaft limiting groove 213, and the abdomen of the rotating shaft 24 can also be supported.

[0083] With reference to Figure 11 and Figure 12 , the arc extinguishing system further includes an arc extinguishing chamber 5. The arc extinguishing chamber 5 has an arc extinguishing cavity 51. The main static contact 12 and the main moving contact 22 are both disposed outside the arc extinguishing cavity 51, the arcing static contact 13 is disposed inside the arc extinguishing cavity 51, and the end of the arcing moving contact 23 for contacting the arcing static contact 13 is always disposed inside the arc extinguishing cavity 51 during movement. Specifically, the arc extinguishing chamber 5 includes two spaced gas generating members and a grid plate group. At least part of the grid plates in the grid plate group are composed of a grid plate abdomen and two grid plate legs to form a U-shaped structure, and the two grid plate legs are respectively inserted into the two gas generating members. In this way, the two gas generating members and the grid plate group enclose to form the arc extinguishing cavity 51, and an opening facing the moving contact assembly 2 is formed on the side of the arc extinguishing cavity 51 away from the grid plate group. Among them, the two gas generating members respectively form the two side walls of the arc extinguishing cavity 51 and are respectively located on opposite sides of the arcing moving contact 23; the end face of the arc extinguishing cavity 51 is the side facing the main moving contact 22, that is, the surface where the opening of the arc extinguishing cavity 51 facing the moving contact assembly 2 is located. Since the main static and moving contacts are disposed outside the arc extinguishing cavity 51, and the arcing static and moving contacts are disposed inside the arc extinguishing cavity 51, the arc generated when the circuit breaker trips is generated inside the arc extinguishing cavity 51.

[0084] As an alternative embodiment, the arc separating protrusion 41 extends from the moving contact assembly 2 towards the arc extinguishing chamber 5; one end of the arc separating protrusion 41 close to the arc extinguishing chamber 5 is placed inside the arc extinguishing cavity 51 and cooperates with the two side walls of the arc extinguishing cavity 51, or one end of the arc separating protrusion 41 close to the arc extinguishing chamber 5 cooperates with the end face of the arc extinguishing cavity 51 (i.e., the surface where the opening of the arc extinguishing cavity 51 facing the moving contact assembly 2 is located).

[0085] In some embodiments, referring to Figure 11 , the arc separating protrusion 41 extends from the moving contact assembly 2 towards the opening of the arc extinguishing cavity 51 and is inserted into the arc extinguishing cavity 51. One end of the arc separating protrusion 41 close to the arc extinguishing chamber 5 is always placed inside the arc extinguishing cavity 51 during the movement process; the two arc separating protrusions 41 are respectively in contact with or have a certain gap from the two side walls of the arc extinguishing cavity 51, so that the arc separating protrusion 41 and the two opposite side walls of the arc extinguishing cavity 51 located on both sides of the arc moving contact 23 together form a defense line for separating the arc moving contact 23 and the main contact 22, further avoiding the problem of the arc and charged particles in the arc extinguishing cavity 51 spilling outwards.

[0086] In some other embodiments, limiting chutes are provided on the two end faces (i.e., the two end faces opposite to the main contact 22) of the arc extinguishing cavity 51 (specifically the gas generating part) located on the opening side. The distance between the two arc separating protrusions 41 is greater than the distance between the two inner wall surfaces of the arc extinguishing cavity 51 located on both sides of the arc moving contact 23 and opposite to each other. At the same time, the two arc separating protrusions 41 correspond to the limiting chutes on the two end faces of the arc extinguishing cavity 51 one by one. The arc separating protrusion 41 extends from the moving contact assembly 2 towards the arc extinguishing chamber 5 and is inserted into the limiting chutes, realizing the plug-in fit between the arc separating protrusion 41 and the end face of the arc extinguishing cavity 51. In this embodiment, the arc separating protrusion 41 and the end face of the arc extinguishing cavity 51 together form a defense line for separating the arc moving contact 23 and the main contact 22. In addition, the limiting chutes may not be provided on this end face, and the arc separating protrusion 41 extends from the moving contact assembly 2 towards the end face of the arc extinguishing cavity 51, and a defense line for separating the arc moving contact 23 and the main contact 22 can also be formed. Setting the limiting chutes can prevent charged particles from spilling out from the contact position between the arc extinguishing chamber 5 and the arc separating protrusion 41, and the arc separating effect is better.

[0087] On the basis of the above structure, in order to avoid contact friction between the arc separating protrusion 41 and the arc extinguishing chamber 5, which affects the movement of the moving contact assembly 2, the vertical distance between the arc separating protrusion 41 and the side wall or end face or limiting chute of the arc extinguishing cavity 51 should be in the range of 0.5 mm to 2 mm. The above structure forms a slit between the arc separating protrusion 41 and the side wall or end face or limiting chute of the arc extinguishing cavity 51. On the one hand, it avoids the generation of frictional force between the arc separating protrusion 41 and the side wall or end face or limiting chute of the arc extinguishing cavity 51, which affects the movement of the moving contact assembly 2. On the other hand, it makes it difficult for the arc and charged particles in the arc extinguishing cavity 51 to spill out from this slit.

[0088] In some embodiments, an avoidance arc surface 52 is provided on one side of the arc extinguishing chamber 5 close to the moving contact 22. The center of the arc of the avoidance arc surface 52 is the rotation center of the static contact assembly 1, and one end of the moving contact 22 contacting the main static contact 12 is arranged opposite to the avoidance arc surface 52. By providing the avoidance arc surface 52, the size of the gap between the moving contact 22 and the arc extinguishing chamber 5 can be kept unchanged during the movement of the moving contact 22. The avoidance arc surface 52 is also the end surface described above; when a limiting sliding groove is provided on the end surface, the groove bottom surface of the limiting sliding groove is also an arc surface with the rotation center of the static contact assembly 1 as the center of the arc. When the arc separating protrusion 41 cooperates with the end surface or the limiting sliding groove of the arc extinguishing cavity 51, the setting of the arc surface can keep the size of the gap between the arc separating protrusion 41 and the end surface or the limiting sliding groove of the arc extinguishing cavity 51 unchanged, making it difficult for the arc and charged particles in the arc extinguishing cavity 51 to overflow from this gap.

[0089] In some embodiments, continue to refer to Figure 2 , one end of the static arc ignition piece 14 far from the static conducting rod 11 extends towards the arc extinguishing chamber 5 and probes into the arc extinguishing chamber 5. The static arc ignition piece 14 and the arc extinguishing chamber 5 Figure 2 at least partially overlap in the height direction in Figure 2 . The static arc ignition piece 14 and the arc extinguishing chamber 5 Figure 2 partially overlap in the height direction in

[0090] . The static arc ignition piece 14 provides support for the arc static contact 13 placed in the arc extinguishing cavity 51, and at the same time guides the arc at the static contact assembly 1 into the arc extinguishing cavity 51. Further, the static arc separating cover 3 extends from the static conducting rod 11 towards the arc extinguishing chamber 5 and probes into the arc extinguishing chamber 5. The static arc separating cover 3 and the arc extinguishing chamber 5

[0091] partially overlap in the height direction in Figure 9 ; the static arc separating cover 3 simultaneously covers the side of the static conducting rod 11 and the static arc ignition piece 14 close to the moving contact assembly 2, providing insulation protection for the static conducting rod 11 and the static arc ignition piece 14.

[0090] Based on the above structure, with the arc static contact 13 as the demarcation position, one side of the static arc ignition piece 14 close to the main static contact 12 is covered by the static arc separating cover 3, and the side of the static arc ignition piece 14 far from the main static contact 12 is located in the arc extinguishing chamber 5.

[0091] In some embodiments, continue to refer to Figure 9 , the number of the arc separating protrusions 41 is two, and they are respectively arranged on both sides of the arc moving contact 23 perpendicular to the plane where its movement track is located; the moving arc separating cover 4 further includes a baffle 43 connected between the two arc separating protrusions 41. Combining Figure 2 , Figure 2The state shown is when the moving and static contact components are separated but not yet completely separated. In this state, the baffle 43 extends from the arc moving contact 23 towards the static arc shield 3. One end of the baffle 43 abuts against the arc moving contact 23, and the other end extends past the static arc shield 3 (i.e., is located below the static arc shield 3); at the same time, along the direction of the movement trajectory of the arc moving contact (indicated by the dashed line in the figure), one end of the arc separating protrusion 41 extends past the main moving contact 22 and the arc moving contact 23 (i.e., is located above the main moving contact 22 and the arc moving contact 23), and the other end extends past the main static contact 12 and the arc static contact 13 (i.e., is located below the main static contact 12 and the arc static contact 13). Since the arc has extinguished when the moving and static contact components are not yet in the completely separated state, when the moving and static contact components are in the completely separated state, one end of the arc separating protrusion 41 extends past the main moving contact 22 and the arc moving contact 23, and the other end can be above or below the main static contact 12 and the arc static contact 13.

[0092] During the closing process, the contact support 21 drives the main and arc moving contacts to rotate counterclockwise. In the state where the moving and static contact components have not yet made contact, one end of the baffle 43 abuts against the arc moving contact 23; when the arc moving contact 23 just contacts the arc static contact 13, the main moving contact 22 and the main static contact 12 have not yet made contact, and the contact support 21 continues to rotate counterclockwise until the main moving contact 22 contacts the main static contact 12 to complete the closing operation; since the moving arc shield 4 is fixed on the contact support 21 and moves with the contact support 21, there is a gap between one end of the baffle 43 and the arc moving contact 23 in the closed state.

[0093] The baffle 43 has the following functions: First, the baffle 43 is connected between the two arc separating protrusions 41, which can strengthen the structural strength of the two arc separating protrusions 41 and prevent the arc separating protrusions 41 from jittering under the gas blowing force during opening. Second, the baffle 43 blocks the arc and charged particles generated during opening, preventing the arc and charged particles from impacting the moving contact assembly 2 in the reverse direction and invading the interior of the circuit breaker. Third, the baffle 43 is equivalent to an opening and closing door of the arc extinguishing cavity 51. Specifically: when the circuit breaker is closed, the baffle 43 moves to open the opening of the arc extinguishing cavity 51, allowing the air inside and outside the arc extinguishing cavity 51 to flow; when the circuit breaker is opened, the baffle 43 moves to close the opening of the arc extinguishing cavity 51, forming a relatively closed space inside the arc extinguishing cavity 51, so that the arc and charged particles can only be discharged from the side of the arc extinguishing cavity 51 away from the moving contact assembly 2 (i.e., the side of the grid group), preventing the arc and charged particles from overflowing to the main moving and static contacts and causing arc breakdown problems. Fourth, the baffle 43 separates the arc extinguishing cavity 51 from the abdomen of the arc moving contact 23, preventing the arc and charged particles from eroding the abdomen of the arc moving contact 23 and prolonging the service life of the arc moving contact 23.

[0094] In summary, after the moving and static contact assemblies of the arc extinguishing system provided by the present application are separated, the arc separating protrusion 41 of the moving arc separating cover 4 and the side wall of the arc extinguishing cavity 51 cooperate to form a defense line blocking between the main moving and static contacts and the arc moving and static contacts, and the baffle 43 of the moving arc separating cover 4 blocks the opening of the arc extinguishing cavity 51, forming a relatively enclosed space inside the arc extinguishing cavity 51, effectively preventing most of the electric arcs from overflowing outward from the opening of the arc extinguishing cavity 51. At the same time, a small amount of overflowing electric arcs are also difficult to contact the static contact assembly 1 under the protection of the static arc separating cover 3, thus greatly reducing the breakdown failure problem caused by the overflow of electric arcs, and further improving the arc extinguishing ability of the system.

[0095] Embodiment 2

[0096] Embodiment 2 of the present application provides an arc extinguishing system, which is different from Embodiment 1 in that: the structure of the static arc separating cover 3 is different. Refer to Figures 13 to 16 , in this embodiment, the surface of the baffle 43 close to the arc extinguishing chamber 5 is a blocking arc surface, and the static arc separating cover 3 further includes a matching arc plate 35 disposed opposite to the blocking arc surface, and both the blocking arc surface and the matching arc plate 35 are centered on the rotation center of the static contact assembly 1. Specifically, refer to Figure 16 , a second avoidance hole 34 for the arc separating protrusion 41 to shuttle through is formed on the static arc separating cover 3, one end of the matching arc plate 35 is connected to the side wall of one side of the second avoidance hole 34, and the other end of the matching arc plate 35 extends in an arc shape in a direction away from the core arc separating surface 33 and penetrates through the third avoidance groove 141 on the static arc guiding piece 14. The matching arc plate 35 is disposed on the side of the horizontal cover plate away from the core arc separating surface 33, avoiding the matching arc plate 35 from hindering the contact between the arc moving contact 23 and the arc static contact 13. A narrow gap is formed between the baffle 43 and the matching arc plate 35, making it difficult for the electric arcs and charged particles in the arc extinguishing cavity 51 to overflow from the narrow gap. In order to avoid friction between the matching arc plate 35 and the baffle 43 affecting the movement of the baffle 43, the vertical distance between the matching arc plate 35 and the baffle 43 is between 0.5 mm and 2 mm.

[0097] In this embodiment, the sealing performance of the adjacent position between the static arc separating cover 3 and the moving arc separating cover 4 is improved by the matching arc plate 35, making it difficult for the electric arcs and charged particles in the arc extinguishing cavity 51 to overflow from the adjacent position between the static arc separating cover 3 and the moving arc separating cover 4.

[0098] Embodiment 3

[0099] Embodiment 3 of the present application provides an arc extinguishing system, which is different from Embodiments 1 and 2 in that: the structure of the static arc separating cover 3 is different. Refer to Figures 17 to 19, in this embodiment, an avoidance passage 36 for the arc isolation protrusion 41 to shuttle through is formed on the static arc isolation cover 3. The opposite surfaces of the avoidance passage 36 and the baffle 43 are both arc surfaces centered on the rotation center of the static contact assembly 1. Specifically, a housing is provided on one side of the horizontal cover plate away from the core arc isolation surface 33. One end of the housing close to the horizontal cover plate is open for the arc isolation protrusion 41 and the baffle 43 to be inserted. The other end of the housing away from the horizontal cover plate may or may not be open, and the avoidance passage 36 is formed inside the housing. In this embodiment, the sealing performance of the contact position between the static arc isolation cover 3 and the moving arc isolation cover 4 is further enhanced through the avoidance passage 36.

[0100] In the embodiment where the end of the housing away from the horizontal cover plate is not open, one end of the avoidance passage 36 is open and the other end is closed. The arc isolation protrusion 41 and the baffle 43 are inserted into the avoidance passage 36 from the open end of the avoidance passage 36. In this structure, when the circuit breaker trips, the arc and charged particles generated are hardly likely to contact the static conductive rod 11 and the part of the static arc guiding piece 14 located between the main and arc static contacts.

[0101] Embodiment 4

[0102] Embodiment 4 of the present application provides a circuit breaker, which has the arc extinguishing system of any of the above embodiments. The circuit breaker can reasonably set the number of arc extinguishing systems according to product specifications and actual usage requirements; for example, the circuit breaker includes three arc extinguishing systems distributed in parallel, and a three-pole loop is conducted in the phase where the three arc extinguishing systems are located. The circuit breaker at least has the beneficial effects of the above embodiments, which will not be elaborated here.

[0103] 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 described 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 a static contact assembly (1), a moving contact assembly (2), a static arc shield (3) and a moving arc shield (4), where: The static contact assembly (1) includes a main static contact (12) and an arc static contact (13); The moving contact assembly (2) includes a main moving contact (22) for contacting or separating from the main static contact (12) and an arc moving contact (23) for contacting or separating from the arc static contact (13); The static arc shield (3) is arranged on the static contact assembly (1) and covers at least part of the surface where the main static contact (12) is located; The moving arc shield (4) is arranged on the moving contact assembly (2), and the moving arc shield (4) includes an arc separating protrusion (41) arranged between the main moving contact (22) and the arc moving contact (23) to separate the two; 2. The arc extinguishing system according to claim 1, characterized in that, The static contact assembly (1) further includes a static conducting rod (11), and both the main static contact (12) and the static arc shield (3) are arranged on the static conducting rod (11).

3. The arc extinguishing system according to claim 2, characterized in that, The static arc shield (3) covers one end of the static conducting rod (11) where the main static contact (12) is arranged, and a first avoidance hole (31) or a first avoidance groove for the main static contact (12) to penetrate through is formed on the static arc shield (3); And / or, the static contact assembly (1) further includes a static arc initiating piece (14) arranged on the static conducting rod (11), the arc static contact (13) is arranged on the static arc initiating piece (14), and the static arc shield (3) also covers at least part of the static arc initiating piece (14); And / or, a second avoidance groove (32) or a second avoidance hole (34) or an avoidance channel (36) for the arc separating protrusion (41) to shuttle through is formed on the static arc shield (3); And / or, a core arc separating surface (33) is arranged on the static arc shield (3), the core arc separating surface (33) covers above the surface where the main static contact (12) on the static conducting rod (11) is located and is lower than the surface of the main static contact (12) contacting the main moving contact (22).

4. The arc extinguishing system according to claim 1, characterized in that, The moving contact assembly (2) further includes a contact support (21), the main moving contact (22) and the arc moving contact (23) are arranged side by side on the contact support (21), and the moving arc shield (4) is arranged on the contact support (21).

5. The arc extinguishing system according to claim 4, characterized in that, A region for accommodating the main moving contact (22) and the arc moving contact (23) is formed by enclosing between the moving arc shield (4) and the contact support (21); And / or, an installation slot (211) is arranged on the contact support (21), and the arc separating protrusion (41) is inserted into the installation slot (211); And / or, the moving arc isolation cover (4) includes a U-shaped cover (42), and the arc isolation protrusion (41) is connected between the U-shaped cover (42) and the contact support (21), and divides the area formed by enclosing the U-shaped cover (42) and the contact support (21) into a first area and a second area. Among them, the first area is used to accommodate the main moving contact (22), and the second area is used to accommodate the arc moving contact (23); And / or, a rib plate (212) is provided on the contact support (21), and the rib plate (212) is provided between the main moving contact (22) and the arc moving contact (23).

6. The arc extinguishing system according to claim 1, characterized in that, The number of the arc isolation protrusions (41) is two, and they are respectively arranged on both sides of the arc moving contact (23) perpendicular to the plane where its movement track is located; the moving arc isolation cover (4) further includes a baffle (43) connected between the two arc isolation protrusions (41).

7. The arc extinguishing system according to claim 1, wherein It further includes an arc extinguishing chamber (5), the arc extinguishing chamber (5) has an arc extinguishing cavity (51), the main static contact (12) and the main moving contact (22) are both located outside the arc extinguishing cavity (51), the arc static contact (13) is located inside the arc extinguishing cavity (51), and one end of the arc moving contact (23) for contacting the arc static contact (13) is always located inside the arc extinguishing cavity (51) during the movement process.

8. The arc extinguishing system according to claim 7, wherein The arc extinguishing chamber (5) includes two spaced gas generating components and a grid plate group, and the two gas generating components and the grid plate group enclose to form the arc extinguishing cavity (51); among them, the two gas generating components respectively form the two side walls of the arc extinguishing cavity (51) and are respectively located on opposite sides of the arc moving contact (23).

9. The arc extinguishing system according to claim 7, characterized in that The static arc isolation cover (3) extends from the static contact assembly (1) towards the arc extinguishing chamber (5) and extends into the arc extinguishing chamber (5); And / or, an avoidance arc surface (52) is provided on one side of the arc extinguishing chamber (5) close to the main moving contact (22), the center of the arc of the avoidance arc surface (52) is the rotation center of the static contact assembly (1), and one end of the main moving contact (22) contacting the main static contact (12) is arranged opposite to the avoidance arc surface (52).

10. The arc extinguishing system according to claim 7, characterized in that, The arc isolation protrusion (41) extends from the moving contact assembly (2) towards the arc extinguishing chamber (5); One end of the arc isolation protrusion (41) close to the arc extinguishing chamber (5) is located inside the arc extinguishing cavity (51) and cooperates with the two side walls of the arc extinguishing cavity (51), or one end of the arc isolation protrusion (41) close to the arc extinguishing chamber (5) cooperates with the end face of the arc extinguishing cavity (51).

11. The arc extinguishing system according to claim 10, characterized in that, A limiting sliding groove is provided on the end face of the arc extinguishing cavity (51), and the arc isolation protrusion (41) is inserted into the limiting sliding groove.

12. A circuit breaker, characterized in that, It includes the arc extinguishing system according to any one of claims 1 to 11.

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