Arc extinguishing system

Abstract

The invention 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 priority to a patent application filed on September 4, 2023, with application number 2023111310814 and named Arc Extinguishing System, and this application cites the full text of the above patent application. Technical Field

[0002] The present application mainly relates to the field of circuit breakers, and in particular to an arc extinguishing system. Background Art

[0003] The circuit breaker is one of the important components in the power distribution network. It can be used to distribute electric energy and protect the line and power supply equipment from the hazards of overload, undervoltage, short circuit, single-phase grounding and other faults. For example, when a short circuit or other fault occurs in the line, the mechanical system in the circuit breaker drives the contact group to move to separate the contact group from the conductive part, thereby cutting off the fault current. In the process of separation of the contact group and the conductive part, the fault current of the protected line is often not cut off in time, and a high-temperature and high-pressure arc will be generated between the two, which leads to the fault current not being cut off in time. In view of the above problems, conventional technology often uses an arc extinguishing system composed of an arc extinguishing cutting blade, an insulating shell, a contact group, a conductive part, and an end cover to extinguish the arc. When the arc is generated, the arc extinguishing cutting blade introduces the arc into the arc extinguishing system, and the arc is cut and extinguished by the cutting blade. Although increasing the number of arc extinguishing cutting blades can improve the reliability of arc extinguishing to a certain extent, it still cannot guarantee timely and reliable arc extinguishing. Summary of the invention

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

[0005] The technical solution adopted by the present application to solve the above-mentioned technical problems is an arc extinguishing system, including a contact group and a conductive member, and also including: a first arc-striking plate and a second arc-striking plate, which are arranged opposite to each other along a first direction, and the conductive member is in contact with the first arc-striking 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-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.

[0006] In one embodiment of the present application, each first cutting blade includes 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 includes 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.

[0007] In an embodiment of the present application, in the 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 one embodiment of the present application, a size of the second cutting blade in the second direction is greater than a size of the first cutting blade 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 one embodiment of the present application, 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.

[0011] In one embodiment of the present application, a third arc extinguishing group is also included, and 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 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.

[0012] In one embodiment of the present application, each of the third cutting blades includes a third tail, a third long arm and a third short arm, 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.

[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 one embodiment of the present application, a size of the second cutting blade in the second direction is greater than a size of the third cutting blade in the second direction, and the difference between the two is greater than 2 mm.

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

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings, wherein:

[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 schematic top view of an arc extinguishing system according to an embodiment of the present application;

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

[0021] Figure 4B The positional relationship between adjacent first cutting pieces in one embodiment of the present application is shown;

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

[0023] Figure 5B The positional relationship between adjacent second cutting pieces in one embodiment of the present application is shown;

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

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

[0026] Figures 7 to 10 It is the process of extinguishing the arc by the arc extinguishing system in one embodiment of the present application.

[0027] Reference numerals

[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 recess 161e

[0031] Conductive member 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] Connecting section 123 First recess 151e Third cutting blade 171

[0035] Main contact 124 Center line 151f Second guide gap 180

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

[0037] First arc-starting plate 130 Second arc-extinguishing group 160 Insulating shell 210

[0038] Bending portion 131 Second cutting piece 161 Mounting groove 211

[0039] Second arc-starting plate 140 Second tail portion 161a Mounting hole 212

[0040] Contact plate 141 Second long arm 161b End cover 220 DETAILED DESCRIPTION

[0041] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

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

[0043] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" 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 words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection 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 at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0045] Next, the arc extinguishing system of the present application is described through specific embodiments.

[0046] Figure 1 and Figure 2 Schematic diagram of arc extinguishing system in different embodiments. Figure 1 and Figure 2 As shown, the arc extinguishing system includes a contact piece group 110 , a conducting member 120 , a first arc striking plate 130 , a second arc striking 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 working state, if the contact piece group 110 is in contact with the conductive member 120, there is an electrical connection between the two; if the contact piece group 110 is not in contact with the conductive member 120, there is an electrical connection between the two. Figure 7 The cross-sectional view of an arc extinguishing system of an embodiment shown in FIG. 1 shows that the conducting member 120 can be divided into three sections: a contact section 121, a transition section 122 and a connecting section 123. The contact section 121 is located at Figure 7 12 is on the left side of the figure, the connecting section 123 is on the right side, and the transition section 122 is between the contact section 121 and the connecting section 123, and connects the contact section 121 and the connecting section 123. The conductive member 120 has a main contact 124 and an auxiliary contact 125, and the contact piece group 110 has a main contact 111 and an auxiliary contact 112. The main contact 111 and the auxiliary contact 112 correspond to the main contact 124 and the auxiliary contact 125, respectively, and the electrical connection between the contact piece group 110 and the conductive member 120 can be achieved through contact.

[0048] like Figure 1As shown, the first arc-starting plate 130 and the second arc-starting plate 140 are arranged opposite to each other along the first direction D1. One end of the first arc-starting plate 130 located at the bottom in the second direction D2 contacts the conductive member 120. The first arc-starting plate 130 and the conductive member 120 can be electrically connected through contact. In some embodiments, the first arc-starting plate 130 has a bent portion 131, and the bent portion 131 fits with the transition section 122 in the conductive member, so as to achieve contact between the first arc-starting plate 130 and the conductive member 120. The method of fitting the bent portion 131 with the transition section 122 includes connecting the two using screws, or welding the two using a welding method.

[0049] The second arc-starting 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 in parallel with the third cutting blade in the third arc-extinguishing group.

[0050] Combined with reference 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 sequentially arranged in the first direction D1 and are located between the first arc-striking plate 130 and the second arc-striking plate 140, wherein the first arc extinguishing group 150 is adjacent to the first arc-striking plate 130, and the third arc extinguishing group 170 is adjacent to the second arc-striking plate 140. The first arc extinguishing group 150 includes a plurality of first cutting blades 151 sequentially arranged along the first direction D1, the second arc extinguishing group 160 includes a plurality of second cutting blades 161 sequentially arranged along the first direction D1, and the third arc extinguishing group 170 includes a plurality of third cutting blades sequentially arranged along the first direction D1. Figure 4A shows a three-dimensional schematic diagram of the first cutting blade 151, Figure 5A A three-dimensional schematic diagram of the second cutting blade 161 is shown in FIG. The shape and size of the third cutting blade are the same as those of the first cutting blade, so a schematic diagram of the third cutting blade is not separately provided. It should be noted that in some other embodiments, the shape and size of the third cutting blade may also be different from those of the first cutting blade. The number of cutting blades in the first arc extinguishing group 150, the second arc extinguishing group 160, and the third arc extinguishing group 170 may be the same or different, and there is no limitation on this.

[0051] refer to Figure 4AAs shown, each first cutting blade 151 includes a first tail portion 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 arranged opposite to each other along the third direction D3, and one end is connected to the first tail portion 151a. The size of the first long arm 151b in the second direction D2 is larger than the size of the first short arm 151c in the second direction D2. The first protrusion 151d is adjacent to the first recess 151e, and is located between the first long arm 151b and the first short arm 151c in the third direction D3. Figure 4A In some other embodiments, the first protrusion 151d is tangent to the first recess 151e. Figure 4A From the top view angle, the first protrusion 151d and the first recess 151e can be connected by a line segment, and the two ends of the line segment are tangent to the first protrusion 151d and the first recess 151e respectively. The third cutting blade is similar to the first cutting blade. For related descriptions, please refer to the first cutting blade, and no further description will be given.

[0052] refer to Figure 5A As shown, each second cutting blade 161 includes a second tail portion 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 arranged opposite to each other along the third direction D3, and one end is connected to the second tail portion 161a. The size of the second long arm 161b in the second direction D2 can be greater than the size of the second short arm 161c in the second direction D2, or can be equal. The second protrusion 161d is adjacent to the second recess 161e, and is located between the second long arm 161b and the second short arm 161c in the third direction D3. Figure 5A In some other embodiments, the second protrusion 161d is tangent to the second recess 161e. Figure 5A From a top view perspective, the second protrusion 161d and the second recess 161e can be connected by a line segment, and two ends of the line segment are tangent to the second protrusion 161d and the second recess 161e respectively.

[0053] As mentioned above, the first arc extinguishing group includes a plurality of first cutting blades arranged in sequence along the first direction D1. The first protrusion of each first cutting blade overlaps with the first recess in the adjacent first cutting blade in the first direction. Figure 4B The schematic diagram of the positional relationship between adjacent first cutting blades in one embodiment is shown to illustrate the positional relationship between adjacent first cutting blades.

[0054] refer to Figure 4B As shown, Figure 4B The two first cut pieces in Figure 1 For the convenience of description, Figure 4BThe two first cutting blades in the embodiment are marked as first cutting blade 151-1 and first cutting blade 151-2, respectively, wherein the first cutting blade 151-1 is located above the first cutting blade 151-2. Figure 4B In the embodiment, one of the first cutting blade 151-1 and the first cutting blade 151-2 is rotated 180° left and right and then arranged adjacent to the other blade. In other words, the positional relationship between the first cutting blade 151-1 and the first cutting blade 151-2 is such that the first short arm 151-1-c of the first cutting blade 151-1 is located above the first long arm 151-2-b of the first cutting blade 151-2, and the first long arm 151-1-b of the first cutting blade 151-1 is located above the first short arm 151-2-c of the first cutting blade 151-2.

[0055] The above positional relationship enables the first protrusion 151-1-d and the first recess 151-1-e to be respectively aligned with the first protrusion 151-2-d and the first recess 151-2-e in the stacking direction of the first cutting sheet (i.e. Figure 1 The first recess 151-1-e and the first protrusion 151-2-d overlap in the first direction D1, and the first recess 151-1-e and the first recess 151-2-e also overlap in the first direction D1. Figure 4B The position indicated by the arrow B in the figure) forms the first guide gap, combined with Figure 7 As shown, the first guide gap penetrates the first arc extinguishing group 150 along the first direction D1. In some embodiments, the maximum width of the first guide gap is equal to or greater than 1 mm, for example, 2 mm, 4 mm, 6 mm, 8 mm or 10 mm.

[0056] refer to Figure 4A As shown, in one embodiment, the first cutting blade 151 has a center line 151f, and the bottom edge 151g is symmetrical about the center line 151f in the third direction D3. The distance between the tangent point between the first protrusion 151d and the first recess 151e and the center line 151f in the third direction D3 is equal to or greater than 0.5mm, such as 2mm, 4mm, 6mm, 8mm or 10mm. If the first protrusion 151d and the first recess 151e are connected by a line segment, the distance between the midpoint of the line segment and the center line 151f in the third direction D3 is equal to or greater than 0.5mm, such as 2mm, 4mm, 6mm, 8mm or 10mm.

[0057] Similarly, as described above, the second arc extinguishing group includes a plurality of second cutting blades arranged in sequence along the first direction D1. The second protrusion of each second cutting blade overlaps with the second recess in the adjacent second cutting blade in the first direction. Figure 5BThe positional relationship between adjacent second cutting blades in one embodiment is shown to illustrate the positional relationship between the second cutting blades.

[0058] refer to Figure 5B As shown, Figure 5B The two second cut pieces in Figure 1 For the convenience of description, Figure 5B The two second cutting blades in the embodiment are marked as the second cutting blade 161-1 and the second cutting blade 161-2, wherein the second cutting blade 161-1 is located above the second cutting blade 161-2. Figure 5B In the embodiment, one of the second cutting blade 161-1 and the second cutting blade 161-2 is rotated 180° left and right and then arranged adjacent to the other blade. In other words, the positional relationship between the second cutting blade 161-1 and the second cutting blade 161-2 is such that the second short arm 161-1-c of the second cutting blade 161-1 is located above the second long arm 161-2-b of the second cutting blade 161-2, and the second long arm 161-1-b of the second cutting blade 161-1 is located above the second short arm 161-2-c of the second cutting blade 161-2.

[0059] The above positional relationship enables the second protrusion 161-1-d and the second recess 161-1-e to be respectively aligned with the second protrusion 161-2-d and the second recess 161-2-e in the stacking direction of the second cutting sheet (i.e. Figure 1 The second recess 161-1-e and the second protrusion 161-2-d overlap in the first direction D1, and the second recess 161-1-e and the second recess 161-2-e also overlap in the first direction D1. Figure 2 , Figure 3 and Figure 5B As shown, the overlapping parts of the second recesses in the plurality of second cutting sheets ( Figure 5B The second guide gap 180 is formed by the second guide gap 180 extending through the second arc extinguishing group along the first direction D1. In some embodiments, the maximum width of the second guide gap is equal to or greater than 1 mm, for example, 2 mm, 4 mm, 6 mm, 8 mm or 10 mm.

[0060] refer to Figure 5AAs shown, in one embodiment, the second cutting blade 161 has a center line 161f, and the bottom edge 161g is symmetrical 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 0.5mm, such as 2mm, 4mm, 6mm, 8mm or 10mm. 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 0.5mm, such as 2mm, 4mm, 6mm, 8mm or 10mm.

[0061] refer to Figure 2 and Figure 3 As shown, similar to the first guide gap in the first arc extinguishing group and the second guide gap in the second arc extinguishing group, the third arc extinguishing group also has a third guide gap 190. For other details of the third guide gap 190, please refer to the description of the first guide gap and the second guide gap in the previous text, which will not be expanded here. The guide gap in the arc extinguishing group can be used to guide the arc to move along a preset path.

[0062] refer to Figure 4B As shown, compared with arranging the first cutting blade 151-1 and the first cutting blade 151-2 in the same placement manner (i.e., the first groove, the first protrusion, the first long arm and the first short arm in the two cutting blades are aligned up and down), the present application rotates one of the first cutting blades 180° and arranges it adjacent to the other first cutting blade, so that after the arc enters each first arc extinguishing group, the adjacent first cutting blades cut the arc successively instead of cutting the arc at the same time, which helps to reduce the difficulty of the arc entering the first arc extinguishing group and makes the arc cutting more complete. 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 blade 151 is aligned with the end of the second cutting blade 161, the center of the first protrusion 151d and the center of 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 may be 5 mm, 10 mm, 15 mm, 20 mm or 25 mm. It should be understood that the shape of the first protrusion 151d and the second protrusion 161d is not a complete circle, but a part of a circle. In addition, when the shape of the first protrusion 151d and the second protrusion 161d is 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 of the two (for example, the center of gravity, the center of the ellipse) in the second direction D2. The first protrusion in the first cutting blade and the third protrusion in the third cutting blade are also spaced apart by a distance relationship similar to Δ3 in the second direction D2. For this, please refer to the description of Δ3 and will not be described in detail. Combined with Figure 2 and Figure 5C As shown, the distance between the first protrusion 151d and the second protrusion 161d, as well as the distance relationship between the first protrusion and the third protrusion make the second protrusion 161d closer to the contact group 110, which is conducive to the second arc extinguishing group cutting the arc first.

[0064] Combination Figure 5C and Figure 7 As shown, in the second direction D2, the second long arm 161b and the second short arm 161c of the second cutting blade 161 are closer to the contact blade group 110 than the first long arm 151b and the first short arm 151c of the first cutting blade 151, and the second long arm 161b and the second short arm 161c of the second cutting blade 161 are closer to the contact blade group 110 than the third long arm and the third short arm of the third cutting blade 171. Figure 7 As 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 group 110 in the second direction D2. The second arc extinguishing group 160 is closer to the contact group 110, which is conducive to timely and effective arc cutting. The technical effect is described below.

[0065] Figures 7 to 10 This is the process of extinguishing the arc by the arc extinguishing system in one embodiment of the present application, refer to Figures 7 to 10 The above technical effects are explained.

[0066] First, refer to Figure 7 As shown, the contact group 110 initially leaves the conductive member 120. During the process from contact to separation between the contact group 110 and the conductive member 120, an arc is generated between the two. One end of the arc adheres to the tip of the contact group 110, and the other end adheres to the first arc-starting plate 130. The arc moves toward the arc extinguishing group under the attraction of the arc extinguishing group.

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

[0068] Next, refer to Fig. 9 As shown, the contact blade group 110 moves to the end position, and the distance between the contact blade group 110 and the conductive member 120 reaches the maximum value. In this process, the arc on the tip of the contact blade group 110 contacts the second arc-starting plate 140, and under the guidance of the guide gap, the arc is further extended to cut with the cutting blade in the first arc-extinguishing group 150 (i.e., the second cutting blade) in addition to cutting with the cutting blade in the second arc-extinguishing group 160.

[0069] Finally, if Fig.10 As shown, after the arc is cut with the second arc extinguishing group 160 and the first arc extinguishing group 150 in succession, it further extends from the tip of the contact piece group 110 through the second arc-starting plate 140 to the third arc extinguishing group 170 and is cut with the cutting piece (third cutting piece) in the third arc extinguishing group 170.

[0070] It can be seen from the above process that there is a sequence in the cutting timing of the arc and each arc extinguishing group, which helps to achieve sufficient cutting of the arc and the cutting pieces in each arc extinguishing group, which is conducive to timely and effective extinguishing of the arc.

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

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

[0073] In the above embodiments, the arc extinguishing system has three arc extinguishing groups. In some other embodiments, the arc extinguishing system may have only two arc extinguishing groups. For example, Fig. 9 The arc extinguishing system may also have arc extinguishing groups greater than 3, for example, Fig. 9 One or more arc extinguishing groups are added to the left side of the first arc extinguishing group 150 , and / or one or more arc extinguishing groups are added to the right side of the third arc extinguishing group 170 .

[0074] refer to Figure 6 The three-dimensional schematic diagram of an insulating shell in one embodiment is shown. In one embodiment, the arc extinguishing system further includes an insulating shell 210. Figure 1 and Figure 3 As shown, the insulating shell 210 is arranged on both sides along the third direction D3 to isolate the arc extinguishing group from the outside. Figure 6 As shown, the insulating shell 210 includes a plurality of mounting grooves 211, and the two sides of the cutting blades in the arc extinguishing group are respectively installed in the corresponding mounting grooves 211. The insulating shell 210 also includes a plurality of mounting holes 212. Figure 4A Shown and Figure 5A As shown, the cutting blade has a mounting protrusion A, and the mounting protrusion A in the cutting blade is inserted into the mounting hole 212 to position the cutting blade.

[0075] refer to Figure 6 As shown, the insulating shell 210 further includes a first protective shell 213, a second protective shell 214 and a third protective shell 215. The first protective shell 213, the second protective shell 214 and the third protective shell 215 can be used to accommodate the long arm and the short arm of the corresponding cutting blade.

[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 of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

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

[0078] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate 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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