Arc extinguishing system

Abstract

The utility model provides an arc extinguishing system, which comprises a contact piece group, a conducting piece, a first end tab and a second end tab, the first arc extinguishing group and the second arc extinguishing group are adjacently arranged in the first direction and located between the first end tab and the second end tab, the first arc extinguishing group comprises a plurality of first cutting blades, the second arc extinguishing group comprises a plurality of second cutting blades, each first cutting blade is provided with a first protrusion and a first recess, and each second cutting blade is provided with a second protrusion and a second recess. Each second cutting piece is provided with a second protrusion and a second recess, the first protrusion of each first cutting piece is overlapped with the first recess of the adjacent first cutting piece in the first direction, and the second protrusion of each second cutting piece is overlapped with the second recess of the adjacent second cutting piece in the first direction. The second cutting set in the arc extinguishing system is closer to the contact piece set, and the cutting time of the arc and each arc extinguishing set has a sequence, so that the full cutting of the arc and the cutting pieces in each arc extinguishing set can be realized, and the arc can be timely and effectively extinguished.

Description

[0001] This application claims the priority of a patent application with an application date of September 4, 2023, an application number of 2023111310814, and a title of Arc Extinguishing System. This application incorporates the entire text of the above-mentioned patent application by reference. Technical Field

[0002] This application mainly relates to the field of circuit breakers, and specifically relates to an arc extinguishing system. Background Art

[0003] A circuit breaker is one of the important components in a power distribution network. It can be used to distribute electric energy and protect lines and power equipment from hazards such as overload, undervoltage, short circuit, and single-phase grounding. For example, when a fault such as a short circuit occurs in a line, the mechanical system in the circuit breaker drives the contact blade group to move to separate the contact blade group from the conducting member, thereby cutting off the fault current. During the separation process of the contact blade group and the conducting member, the fault current of the protected line often cannot be cut off in time, and a high-temperature and high-pressure arc will be generated between them, which results in the failure to cut off the fault current in time. To address the above problems, in conventional technologies, an arc extinguishing system composed of an arc extinguishing cutting piece, an insulating shell, a contact blade group, a conducting member, and an end cover is often used to extinguish the arc. When the arc is generated, the arc extinguishing cutting piece introduces the arc into the arc extinguishing system, and the arc is cut and extinguished by the cutting piece. Although increasing the number of arc extinguishing cutting pieces can improve the reliability of extinguishing the arc to a certain extent, it still cannot ensure timely and reliable extinguishing of the arc. Summary of the Utility Model

[0004] The technical problem to be solved by this application is to provide an arc extinguishing system that can extinguish the arc in a timely and effective manner.

[0005] The technical solution adopted by this application to solve the above technical problem is an arc extinguishing system, which includes a contact blade group and a conducting member, and further includes: a first arc guiding plate and a second arc guiding plate, which are arranged opposite to each other along a first direction, and the conducting member is in contact with the first arc guiding plate; and a first arc extinguishing group and a second arc extinguishing group, which are arranged adjacent to each other along the first direction and are located between the first arc guiding plate and the second arc guiding plate. The first arc extinguishing group includes a plurality of first cutting pieces arranged in sequence along the first direction, and the second arc extinguishing group includes a plurality of second cutting pieces arranged in sequence along the first direction. Among them, each first cutting piece has an adjacent first protrusion and a first depression, and each second cutting piece has an adjacent second protrusion and a second depression. The first protrusion of each first cutting piece overlaps with the first depression in the adjacent first cutting piece in the first direction, and the second protrusion of each second cutting piece overlaps with the second depression in the adjacent second cutting piece in the first direction.

[0006] In an embodiment of the present application, each first cutting piece includes a first tail portion, a first long arm, and a first short arm. The first long arm and the first short arm are disposed opposite to each other along a third direction and are connected to the first tail portion at one end. Among them, the first protrusion and the first depression are located between the first long arm and the first short arm along the third direction. Each second cutting piece includes a second tail portion, a second long arm, and a second short arm. The second long arm and the second short arm are disposed opposite to each other along the third direction and are connected to the second tail portion at one end. Among them, the second protrusion and the second depression are located between the second long arm and the second short arm along the third direction.

[0007] In an embodiment of the present application, in a second direction, the second long arm is closer to the contact piece group than the first long arm, and the second short arm is closer to the contact piece group than the first short arm.

[0008] In an embodiment of the present application, the size of the second cutting piece in the second direction is greater than the size of the first cutting piece in the second direction, and the difference between the two is greater than 2 mm.

[0009] In an embodiment of the present application, in the second direction, the second protrusion is closer to the contact piece group than the first protrusion, and the distance between the first protrusion and the second protrusion in the second direction is greater than 2 mm.

[0010] In an embodiment of the present application, the overlapping portions of the first depressions of the multiple first cutting pieces form a first guiding gap, and the first guiding gap penetrates through the first arc extinguishing group along the first direction. The overlapping portions of the second depressions of the multiple second cutting pieces form a second guiding gap, and the second guiding gap penetrates through the second arc extinguishing group along the first direction.

[0011] In an embodiment of the present application, a third arc extinguishing group is further included. The third arc extinguishing group is adjacent to the second arc extinguishing group in the first direction. The third arc extinguishing group includes multiple third cutting pieces arranged in sequence in the first direction. Among them, the third cutting piece has adjacent third protrusions and third depressions, and the third protrusions of each third cutting piece overlap with the third depressions in adjacent third cutting pieces in the first direction.

[0012] In an embodiment of the present application, each third cutting piece includes a third tail portion, a third long arm, and a third short arm. The third long arm and the third short arm are disposed opposite to each other along the third direction and are connected to the third tail portion at one end. Among them, the third protrusion and the third depression are located between the third long arm and the third short arm along the third direction.

[0013] In an embodiment of the present application, in the second direction, the second long arm is closer to the contact piece group than the third long arm, and the second short arm is closer to the contact piece group than the third short arm.

[0014] In an embodiment of the present application, the size of the second cutting piece in the second direction is larger than that of the third cutting piece in the second direction, and the difference between the two is greater than 2 mm.

[0015] In the arc extinguishing system of the present application, the second cutting group is closer to the contact piece group, and there is a sequence in the cutting timing of the arc with each arc extinguishing group. This helps to achieve sufficient cutting of the arc with the cutting pieces in each arc extinguishing group, which is beneficial to extinguish the arc in a timely and effective manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the above objects, features, and advantages of the present application more obvious and understandable, the following detailed description of the specific embodiments of the present application is provided in conjunction with the accompanying drawings, where:

[0017] Figure 1 is a three-dimensional schematic diagram of an arc extinguishing system according to an embodiment of the present application;

[0018] Figure 2 is a three-dimensional schematic diagram of an arc extinguishing system according to another embodiment of the present application;

[0019] Figure 3 is a top view schematic diagram of an arc extinguishing system according to an embodiment of the present application;

[0020] Figure 4A is a three-dimensional schematic diagram of the first cutting piece in an embodiment of the present application;

[0021] Figure 4B shows the positional relationship between adjacent first cutting pieces in an embodiment of the present application;

[0022] Figure 5A is a three-dimensional schematic diagram of the second cutting piece in an embodiment of the present application;

[0023] Figure 5B shows the positional relationship between adjacent second cutting pieces in an embodiment of the present application;

[0024] Figure 5C is a three-dimensional schematic diagram of the first cutting piece and the second cutting piece in an embodiment of the present application;

[0025] Figure 6 is a three-dimensional schematic diagram of the insulating shell in an embodiment of the present application;

[0026] Figures 7 to 10 is the process of the arc extinguishing system of the present application extinguishing the arc.

[0027] REFERENCE SIGNS

[0028] Contact piece group 110, first arc extinguishing group 150, second short arm 161c

[0029] Main contact 111, first cutting piece 151, second protrusion 161d

[0030] Auxiliary contact 112, first tail 151a, second depression 161e

[0031] Conduction part 120, first long arm 151b, center line 161f

[0032] Contact section 121, first short arm 151c, bottom edge 161g

[0033] Transition section 122, first protrusion 151d, third arc extinguishing group 170

[0034] Connection section 123, first depression 151e, third cutting piece 171

[0035] Main contact 124, center line 151f, second guiding gap 180

[0036] Auxiliary contact 125, bottom edge 151g, third guiding gap 190

[0037] First arc guiding plate 130, second arc extinguishing group 160, insulating housing 210

[0038] Bending part 131, second cutting piece 161, mounting groove 211

[0039] Second arc guiding plate 140, second tail 161a, mounting hole 212

[0040] Contact plate 141, second long arm 161b, end cover 220 Detailed implementation manners

[0041] To make the above objects, features, and advantages of the present application more obvious and understandable, the following detailed description of the specific implementation manners of the present application is provided in conjunction with the accompanying drawings.

[0042] In the following description, many specific details are set forth to facilitate a thorough understanding of the present application. However, the present application may be implemented in other ways different from those described herein, and thus the present application is not limited by the specific embodiments disclosed below.

[0043] As shown in the present application and the claims, unless the context clearly indicates otherwise, words such as "a", "an", "one", and / or "the" are not specifically singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0044] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is merely for the convenience of differentiating the corresponding components. Without additional declaration, the above terms have no special meaning, and thus should not be construed as a limitation on the protection scope of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant according to his or her judgment, and their detailed meanings are described in the relevant parts of this description. In addition, it is required to understand this application not only through the actual terms used, but also through the meaning implied by each term.

[0045] Next, the arc extinguishing system of this application will be described through specific embodiments.

[0046] Figure 1 and Figure 2 are perspective schematic diagrams of arc extinguishing systems of different embodiments. Refer to Figure 1 and Figure 2 As shown, the arc extinguishing system includes a contact piece group 110, a conduction member 120, a first arc ignition plate 130, a second arc ignition plate 140, a first arc extinguishing group 150, a second arc extinguishing group 160, and a third arc extinguishing group 170.

[0047] When the arc extinguishing system is in the working state, if the contact piece group 110 contacts the conduction member 120, there is an electrical connection between the two; if the contact piece group 110 does not contact the conduction member 120, the electrical connection between the two is disconnected. Refer to the cross-sectional view of the arc extinguishing system of an embodiment shown in Figure 7 . The conduction member 120 can be divided into three sections: a contact section 121, a transition section 122, and a connection section 123. The contact section 121 is located on the left side in Figure 7 , the connection section 123 is located on the right side, and the transition section 122 is located between the contact section 121 and the connection section 123 and connects the contact section 121 and the connection section 123. The conduction member 120 has a main contact 124 and a secondary contact 125, and the contact piece group 110 has a main contact 111 and a secondary contact 112. The main contact 111 and the secondary contact 112 respectively correspond to the main contact 124 and the secondary contact 125, and the electrical connection between the contact piece group 110 and the conduction member 120 can be achieved through contact.

[0048] As Figure 1As shown, the first arcing plate 130 and the second arcing plate 140 are oppositely arranged along the first direction D1. One end of the first arcing plate 130 located below in the second direction D2 is in contact with the conducting member 120. Electrical connection can be achieved between the first arcing plate 130 and the conducting member 120 through contact. In some embodiments, the first arcing plate 130 has a bent portion 131, and the bent portion 131 is fitted to the transition section 122 in the conducting member, thus realizing the contact between the first arcing plate 130 and the conducting member 120. The method of fitting the bent portion 131 to the transition section 122 includes connecting the two with screws or welding them.

[0049] The second arcing plate 140 has a contact plate 141, a transition plate 142, and an extension plate 143 connected in sequence. The contact plate 141 is close to the second arc extinguishing group 160 in the first direction D1. The extension plate 143 can be arranged parallel to the third cutting piece in the third arc extinguishing group.

[0050] With reference to Figure 1 and Figure 7 As shown, the first arc extinguishing group 150, the second arc extinguishing group 160, and the third arc extinguishing group 170 are arranged in sequence in the first direction D1 and are located between the first arcing plate 130 and the second arcing plate 140. Among them, the first arc extinguishing group 150 is adjacent to the first arcing plate 130, and the third arc extinguishing group 170 is adjacent to the second arcing plate 140. The first arc extinguishing group 150 includes a plurality of first cutting pieces 151 arranged in sequence along the first direction D1, the second arc extinguishing group 160 includes a plurality of second cutting pieces 161 arranged in sequence along the first direction D1, and the third arc extinguishing group 170 includes a plurality of third cutting pieces arranged in sequence along the first direction D1. Figure 4A A three-dimensional schematic diagram of the first cutting piece 151 is shown, Figure 5A A three-dimensional schematic diagram of the second cutting piece 161 is shown in [reference]. The shape and size of the third cutting piece are the same as those of the first cutting piece, so a schematic diagram of the third cutting piece is not given separately. It should be noted that in some other embodiments, the shape and size of the third cutting piece can also be different from those of the first cutting piece. The number of cutting pieces in the first arc extinguishing group 150, the second arc extinguishing group 160, and the third arc extinguishing group 170 can be the same or different, and no limitation is made thereto.

[0051] Refer to Figure 4AAs shown, each first cutting piece 151 includes a first tail 151a, a first long arm 151b, a first short arm 151c, a first protrusion 151d, and a first recess 151e. The first long arm 151b and the first short arm 151c are oppositely arranged along the third direction D3, and one end of each is connected to the first tail 151a. The dimension of the first long arm 151b in the second direction D2 is greater than the dimension of the first short arm 151c in the second direction D2. The first protrusion 151d and the first recess 151e are adjacent, and are located between the first long arm 151b and the first short arm 151c in the third direction D3. In Figure 4A the first protrusion 151d and the first recess 151e are tangent to each other. In some other embodiments, when viewed from the top view angle of Figure 4A , a line segment can connect the first protrusion 151d and the first recess 151e, and the two ends of this line segment are respectively tangent to the first protrusion 151d and the first recess 151e. The third cutting piece is similar to the first cutting piece, and for related descriptions, please refer to the first cutting piece and will not be elaborated here.

[0052] Refer to Figure 5A As shown, each second cutting piece 161 includes a second tail 161a, a second long arm 161b, a second short arm 161c, a second protrusion 161d, and a second recess 161e. The second long arm 161b and the second short arm 161c are oppositely arranged along the third direction D3, and one end of each is connected to the second tail 161a. The dimension of the second long arm 161b in the second direction D2 may be greater than the dimension of the second short arm 161c in the second direction D2, or may be equal. The second protrusion 161d and the second recess 161e are adjacent, and are located between the second long arm 161b and the second short arm 161c in the third direction D3. In Figure 5A the second protrusion 161d and the second recess 161e are tangent to each other. In some other embodiments, when viewed from the top view angle of Figure 5A , a line segment can connect the second protrusion 161d and the second recess 161e, and the two ends of this line segment are respectively tangent to the second protrusion 161d and the second recess 161e.

[0053] As described above, the first arc extinguishing group includes multiple first cutting pieces arranged in sequence along the first direction D1. The first protrusion of each first cutting piece overlaps with the first recess in the adjacent first cutting piece in the first direction. Next, in combination with Figure 4B the schematic diagram of the positional relationship between adjacent first cutting pieces in an embodiment shown, the positional relationship between adjacent first cutting pieces will be described.

[0054] Refer to Figure 4B As shown, Figure 4B the two first cutting pieces in Figure 1 are two adjacent first cutting pieces from Figure 4BTwo first cutting pieces therein are respectively marked as first cutting piece 151-1 and first cutting piece 151-2, wherein, the first cutting piece 151-1 is located above the first cutting piece 151-2. In Figure 4B one of the first cutting piece 151-1 and the first cutting piece 151-2 is rotated 180° left and right and then arranged adjacent to the other. Or rather, the positional relationship between the first cutting piece 151-1 and the first cutting piece 151-2 makes the first short arm 151-1-c of the first cutting piece 151-1 located above the first long arm 151-2-b of the first cutting piece 151-2, and the first long arm 151-1-b of the first cutting piece 151-1 located above the first short arm 151-2-c of the first cutting piece 151-2.

[0055] The above positional relationship makes the first protrusion 151-1-d and the first depression 151-1-e respectively offset from the first protrusion 151-2-d and the first depression 151-2-e in the stacking direction of the first cutting piece (i.e., Figure 1 the first direction D1 in Figure 4B ), the first depression 151-1-e overlaps with the first protrusion 151-2-d in the first direction D1, and the first depression 151-1-e also overlaps with the first depression 151-2-e in the first direction D1. The overlapping parts of the first depressions in multiple first cutting pieces ( Figure 7 the position indicated by the arrow B in

[0056] form a first guiding gap. As shown in combination with Figure 4A the first guiding gap penetrates through the first arc extinguishing group 150 along the first direction D1. In some embodiments, the maximum width of the first guiding gap is equal to or greater than 1 mm, for example, 2 mm, 4 mm, 6 mm, 8 mm or 10 mm.

[0057] Similarly, as described above, the second arc extinguishing group includes multiple second cutting pieces arranged in sequence along the first direction D1. The second protrusions of each second cutting piece overlap with the second depressions in adjacent second cutting pieces in the first direction. Next, in combination with Figure 5BIn an illustrated embodiment, the positional relationship between adjacent second cutting pieces is described for the positional relationship between the second cutting pieces.

[0058] Referring Figure 5B as shown, Figure 5B two of the second cutting pieces in Figure 1 are from two adjacent first cutting pieces in Figure 5B . For convenience of description, the two second cutting pieces in Figure 5B are respectively marked as second cutting piece 161-1 and second cutting piece 161-2, where the second cutting piece 161-1 is located above the second cutting piece 161-2. In

[0059] , after one of the second cutting piece 161-1 and the second cutting piece 161-2 is rotated 180° left and right, it is arranged adjacent to the other. Or rather, the positional relationship between the second cutting piece 161-1 and the second cutting piece 161-2 makes the second short arm 161-1-c of the second cutting piece 161-1 located above the second long arm 161-2-b of the second cutting piece 161-2, and the second long arm 161-1-b of the second cutting piece 161-1 located above the second short arm 161-2-c of the second cutting piece 161-2.

[0059] The above positional relationship makes the second protrusion 161-1-d and the second recess 161-1-e respectively offset from the second protrusion 161-2-d and the second recess 161-2-e in the stacking direction of the second cutting pieces (i.e., the first direction D1 in Figure 1 ), there is an overlap between the second recess 161-1-e and the second protrusion 161-2-d in the first direction D1, and there is also an overlap between the second recess 161-1-e and the second recess 161-2-e in the first direction D1. Combining Figure 2 , Figure 3 and Figure 5B as shown, the overlapping parts of the second recesses in multiple second cutting pieces (the position pointed by the arrow C in Figure 5B ) form the second guiding gap 180, and the second guiding gap 180 penetrates the second arc extinguishing group along the first direction D1. In some embodiments, the maximum width of the second guiding gap is equal to or greater than 1 mm, for example, 2 mm, 4 mm, 6 mm, 8 mm or 10 mm.

[0060] Referring Figure 5AAs shown, in one embodiment, the second cutting piece 161 has a center line 161f, and the bottom edge 161g is symmetric about the center line 161f in the third direction D3. The distance between the tangent point between the second protrusion 161d and the second recess 161e and the center line 161f in the third direction D3 is equal to or greater than 0.5 mm, such as 2 mm, 4 mm, 6 mm, 8 mm or 10 mm. If the second protrusion 161d and the second recess 161e are connected by a line segment, the distance between the midpoint of the line segment and the center line 161f in the third direction D3 is equal to or greater than 0.5 mm, such as 2 mm, 4 mm, 6 mm, 8 mm or 10 mm.

[0061] Refer to Figure 2 and Figure 3 As shown, similar to the first guiding gap in the first arc extinguishing group and the second guiding gap in the second arc extinguishing group, the third arc extinguishing group also has a third guiding gap 190. For other details about the third guiding gap 190, please refer to the descriptions of the first guiding gap and the second guiding gap above, and will not be elaborated here. The guiding gap in the arc extinguishing group can be used to guide the movement of the arc, so that the arc moves along a preset path.

[0062] Refer to Figure 4B As shown, compared with arranging the first cutting piece 151-1 and the first cutting piece 151-2 in the same placement manner (that is, the first grooves, first protrusions, first long arms and first short arms in the two cutting pieces are aligned up and down), in this application, one of the first cutting pieces is rotated 180° and then arranged adjacent to the other first cutting piece. This enables the adjacent first cutting pieces to cut the arc successively rather than simultaneously after the arc enters each first arc extinguishing group, which helps to reduce the difficulty of the arc entering the first arc extinguishing group and makes the arc cutting more sufficient. The second arc extinguishing group and the third arc extinguishing group also have similar technical effects.

[0063] Refer to Figure 5CAs shown, in one embodiment, when the end of the first cutting piece 151 is aligned with the end of the second cutting piece 161, the centers of the first protrusion 151d and the second protrusion 161d are spaced apart by a distance Δ3 in the second direction D2, and Δ3 is greater than 2 mm. For example, Δ3 can be 5 mm, 10 mm, 15 mm, 20 mm, or 25 mm. It should be understood that the shapes of the first protrusion 151d and the second protrusion 161d are not a complete circle, but a part of a circle. In addition, when the shapes of the first protrusion 151d and the second protrusion 161d are not a part of a circle, for example, a part of an ellipse, in this case, Δ3 represents the distance between the same geometric positions (such as the center of gravity, the center of the ellipse) of the two in the second direction D2. The first protrusion in the first cutting piece and the third protrusion in the third cutting piece also have a similar distance relationship in the second direction D2. For this, please refer to the description of Δ3 and no further elaboration will be given. Combining Figure 2 and Figure 5C As shown, the above distance between the first protrusion 151d and the second protrusion 161d, and the distance relationship between the first protrusion and the third protrusion make the second protrusion 161d closer to the contact piece group 110, which is beneficial for the second arc extinguishing group to cut the arc first.

[0064] Combining Figure 5C and Figure 7 As shown, in the second direction D2, the second long arm 161b and the second short arm 161c in the second cutting piece 161 are closer to the contact piece group 110 than the first long arm 151b and the first short arm 151c in the first cutting piece 151, and the second long arm 161b and the second short arm 161c in the second cutting piece 161 are closer to the contact piece group 110 than the third long arm and the third short arm in the third cutting piece 171. Thus, as Figure 7 shown, compared with the first arc extinguishing group 150 and the third arc extinguishing group 170, the second arc extinguishing group 160 is closer to the contact piece group 110 in the second direction D2. The second arc extinguishing group 160 being closer to the contact piece group 110 is beneficial for cutting the arc in a timely and effective manner. Next, the technical effect will be elaborated.

[0065] Figures 7 to 10 is the process of the arc extinguishing system extinguishing the arc in an embodiment of the present application. Refer to Figures 7 to 10 to illustrate the above technical effect.

[0066] First, refer to Figure 7 As shown, the contact piece group 110 initially leaves the conducting piece 120. During the process of the contact piece group 110 separating from the conducting piece 120 from contact, an arc is generated between the two. One end of the arc adheres to the tip of the contact piece group 110, and the other end adheres to the first arc guiding plate 130. The arc moves towards the arc extinguishing group under the attraction of the arc extinguishing group.

[0067] Next, refer toFigure 8 As shown, as the contact piece group 110 moves further away from the conduction piece 120, the arc is elongated. The arc enters the guiding gap in the cutting group and starts to cut with each arc extinguishing group. Since the second arc extinguishing group 160 is closer to the contact piece group 110 than the first arc extinguishing group 150 and the third arc extinguishing group 170, the arc first cuts with the cutting piece (i.e., the first cutting piece) in the second arc extinguishing group 160.

[0068] Next, referring to Figure 9 As shown, the contact piece group 110 moves to the termination position, and the distance between the contact piece group 110 and the conduction piece 120 reaches the maximum value. During this process, the arc at the tip of the contact piece group 110 contacts the second arc guiding plate 140. Under the guidance of the guiding gap, in addition to cutting with the cutting pieces in the second arc extinguishing group 160, the arc further expands to cut with the cutting pieces (i.e., the second cutting pieces) in the first arc extinguishing group 150.

[0069] Finally, as Figure 10 shown, after the arc cuts with the second arc extinguishing group 160 and the first arc extinguishing group 150 in sequence, it further expands from the tip of the contact piece group 110 through the second arc guiding plate 140 to the third arc extinguishing group 170 and cuts with the cutting pieces (the third cutting pieces) in the third arc extinguishing group 170.

[0070] From the above process, it can be seen that there is a sequence in the cutting timing of the arc with each arc extinguishing group. This helps to achieve sufficient cutting of the cutting pieces in each arc extinguishing group by the arc, which is beneficial to extinguishing the arc in a timely and effective manner.

[0071] Referring to Figure 5C the first cutting piece 151 and the second cutting piece 161 shown. In one embodiment, when the end of the first cutting piece 151 is aligned with the end of the second cutting piece 161, the dimension of the second cutting piece 161 in the second direction D2 is greater than the dimension of the first cutting piece 151 in the second direction D2, and there is a difference Δ1 between them. The difference Δ1 is greater than 2 mm, and the difference Δ1 can be 5 mm, 10 mm, 15 mm, 20 mm, or 25 mm. Similarly, the dimension of the second cutting piece in the second direction D2 is greater than the dimension of the third cutting piece in the second direction D2, and there is a difference Δ2 between them. The difference Δ2 is greater than 2 mm, and the difference Δ2 can be 5 mm, 10 mm, 15 mm, 20 mm, or 25 mm. Combining Figure 2 and Figure 5C shown, one end of the first cutting piece 151, the second cutting piece 161, and the third cutting piece 171 close to the end cover 220 is aligned or substantially aligned. Thus, since the dimension of the second cutting piece 161 in the second direction D2 is larger than that of the first cutting piece 151 and the third cutting piece 171, the second arc extinguishing group is closer to the contact piece group than the first arc extinguishing group and the third arc extinguishing group.

[0072] In some other embodiments, the first cutting piece 151, the second cutting piece 161, and the third cutting piece 171 have the same size in the second direction D2, and the ends close to the end cover 220 are not aligned. The distance between the second cutting piece 161 and the end cover 220 in the second direction D2 is greater than the distance between the first cutting piece 151 and the end cover 220 in the second direction D2, and the distance between the third cutting piece 171 and the end cover 220 in the second direction D2. Thus, the second arc extinguishing group is closer to the contact piece group than the first arc extinguishing group and the third arc extinguishing group.

[0073] In the foregoing embodiments, the arc extinguishing system has three arc extinguishing groups. In some other embodiments, the arc extinguishing system may also have only two arc extinguishing groups. For example, removing Figure 9 the third arc extinguishing group 170 therein, the arc extinguishing system may also have more than 3 arc extinguishing groups. For example, adding one or more arc extinguishing groups to the left of the first arc extinguishing group 150 in Figure 9 and / or adding one or more arc extinguishing groups to the right of the third arc extinguishing group 170.

[0074] Referring to Figure 6 the three-dimensional schematic diagram of the insulating housing in an embodiment shown, in an embodiment, the arc extinguishing system further includes an insulating housing 210. Combining Figure 1 and Figure 3 shown, the insulating housing 210 is arranged on both sides along the third direction D3 to isolate the arc extinguishing groups from the outside. As Figure 6 shown, the insulating housing 210 includes a plurality of mounting grooves 211, and both sides of the cutting pieces in the arc extinguishing groups are respectively mounted in the corresponding mounting grooves 211. The insulating housing 210 further includes a plurality of mounting holes 212. Referring to Figure 4A shown and shown in 5A, the cutting piece has a mounting protrusion A, and the mounting protrusion A in the cutting piece is inserted into the mounting hole 212 to position the cutting piece.

[0075] Referring to Figure 6 shown, the insulating housing 210 further includes a first protective housing 213, a second protective housing 214, and a third protective housing 215. The first protective housing 213, the second protective housing 214, and the third protective housing 215 can be used to accommodate the long arms and short arms in the corresponding cutting pieces.

[0076] The basic concepts have been described above. Obviously, for those skilled in the art, the above application disclosure is only an example and does not constitute a limitation to this application. Although not explicitly stated here, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are proposed in this application, so such modifications, improvements, and corrections still fall within the spirit and scope of the exemplary embodiments of this application.

[0077] Meanwhile, this application uses specific terms to describe the embodiments of this application. For example, "an embodiment", "one embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application can be appropriately combined.

[0078] In some embodiments, numbers are used to describe components and the quantity of attributes. It should be understood that such numbers used to describe embodiments are modified by the modifiers "about", "approximately", or "substantially" in some examples. Unless otherwise specified, "about", "approximately", or "substantially" indicate that the stated number allows a ±20% variation. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, and these approximate values can change according to the characteristics required by individual embodiments. In some embodiments, the numerical parameters should consider the specified significant digits and adopt the method of retaining general digits. Although the numerical ranges and parameters used to confirm the scope breadth in some embodiments of this application are approximate values, in specific embodiments, such numerical settings are made as precise as possible within the feasible range.

Claims

1. An arc extinguishing system, comprising a contact piece group and a conducting member, characterized in that: Also includes: A first arc-starting plate and a second arc-starting plate are arranged opposite to each other along a first direction, and the conductive member is in contact with the first arc-starting plate; as well as The first arc extinguishing group and the second arc extinguishing group are adjacently arranged along the first direction and located between the first arc striking plate and the second arc striking plate, the first arc extinguishing group includes a plurality of first cutting blades arranged in sequence along the first direction, and the second arc extinguishing group includes a plurality of second cutting blades arranged in sequence along the first direction, wherein each of the first cutting blades has adjacent first protrusions and first recesses, and each of the second cutting blades has adjacent second protrusions and second recesses, the first protrusion of each first cutting blade overlaps with the first recess in the adjacent first cutting blade in the first direction, and the second protrusion of each second cutting blade overlaps with the second recess in the adjacent second cutting blade in the first direction.

2. The arc extinguishing system according to claim 1, characterized in that: Each first cutting blade comprises a first tail portion, a first long arm and a first short arm, the first long arm and the first short arm are arranged opposite to each other along a third direction, and one end is connected to the first tail portion, wherein the first protrusion and the first recess are located between the first long arm and the first short arm along the third direction, and each second cutting blade comprises a second tail portion, a second long arm and a second short arm, the second long arm and the second short arm are arranged opposite to each other along the third direction, and one end is connected to the second tail portion, wherein the second protrusion and the second recess are located between the second long arm and the second short arm along the third direction.

3. The arc extinguishing system according to claim 2, characterized in that: In the second direction, the second long arm is closer to the contact group than the first long arm, and the second short arm is closer to the contact group than the first short arm.

4. The arc extinguishing system according to claim 3, characterized in that: The size of the second cutting blade in the second direction is greater than the size of the first cutting blade in the second direction, and the difference between the two is greater than 2 mm.

5. The arc extinguishing system according to claim 1, characterized in that: In the second direction, the second protrusion is closer to the contact piece group than the first protrusion, and the distance between the first protrusion and the second protrusion in the second direction is greater than 2 mm.

6. The arc extinguishing system according to claim 1, characterized in that: The overlapping parts of the first recesses of the multiple first cutting blades constitute a first guide gap, and the first guide gap runs through the first arc extinguishing group along the first direction. The overlapping parts of the second recesses of the multiple second cutting blades constitute a second guide gap, and the second guide gap runs through the second arc extinguishing group along the first direction.

7. The arc extinguishing system according to claim 2, characterized in that It also includes a third arc extinguishing group, which is adjacent to the second arc extinguishing group in the first direction, and the third arc extinguishing group includes multiple third cutting blades arranged in sequence in the first direction, wherein the third cutting blades have adjacent third protrusions and third recesses, and the third protrusion of each third cutting blade overlaps with the third recess in the adjacent third cutting blade in the first direction.

8. The arc extinguishing system according to claim 7, characterized in that: Each of the third cutting blades includes a third tail, a third long arm and a third short arm, wherein the third long arm and the third short arm are arranged opposite to each other along a third direction and one end is connected to the third tail, wherein the third protrusion and the third recess are located between the third long arm and the third short arm along the third direction.

9. The arc extinguishing system according to claim 8, characterized in that: In the second direction, the second long arm is closer to the contact group than the third long arm, and the second short arm is closer to the contact group than the third short arm.

10. The arc extinguishing system according to claim 8, characterized in that: The size of the second cutting blade in the second direction is greater than the size of the third cutting blade in the second direction, and the difference between the two is greater than 2 mm.

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