Moving contact structure and circuit breaker

Abstract

The utility model relates to the technical field of low-voltage electric appliances, in particular to a moving contact structure and a circuit breaker, the moving contact structure comprises a plurality of moving contact pieces, a moving contact supporting piece and an insulating piece, the plurality of moving contact pieces are arranged on the moving contact supporting piece side by side, and the plurality of moving contact pieces are divided into a plurality of arc moving contact pieces and a plurality of active contact pieces; the insulating sheet is arranged between the arc moving contact and the active contact which are adjacent to each other, and the insulating sheet can separate the active contacts on the arc moving contact and the active contact which are adjacent to each other; a rib plate is arranged on the moving contact supporting piece, and the rib plate is clamped between the arc moving contact piece and the active contact piece which are adjacent to each other. The insulating sheet can block electric arc and / or charged particles at the arc moving contact, so that the active contact is prevented from being broken down, and the breaking performance is improved; and the shaft sleeve does not need to be machined and assembled by adopting a rib plate positioning mode, so that the assembling process is more convenient, the production efficiency is improved, and the labor cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a moving contact structure and a circuit breaker. Background Art

[0002] The circuit breaker is an important part of the low-voltage electrical appliance field. In recent years, with the further increase in the demand of the power industry and the distribution system, the requirements for the circuit breaker are getting higher and higher. It is not only required that the circuit breaker can bear a larger voltage and a higher current, but also required that the circuit breaker has a smaller size. Therefore, how to better interrupt high voltage on the basis of ensuring the small size of the circuit breaker has become one of the bottlenecks in the design process of the circuit breaker.

[0003] The existing frame circuit breakers have the following disadvantages: Due to the design requirement of the small size of the circuit breaker, the distance between the arc moving contact piece and the main moving contact piece needs to be reduced as much as possible, resulting in that when interrupting high voltage, the arc is easily broken through from the arc moving contact to the main contact, and the arc continues to burn between the main contacts, causing the interruption failure. Summary of the Utility Model

[0004] The first object of the utility model is to provide a moving contact structure to solve the technical problem that in the prior art, when interrupting high voltage, the arc is easily broken through from the arc moving contact to the main contact, and the arc continues to burn between the main contacts, causing the interruption failure.

[0005] In order to achieve the above object, the utility model adopts the following technical solutions:

[0006] A moving contact structure includes a plurality of moving contact pieces and a moving contact support. The plurality of moving contact pieces are arranged side by side on the moving contact support. The plurality of moving contact pieces are divided into several arc moving contact pieces and several main moving contact pieces. An insulating sheet is further included. The insulating sheet is arranged between adjacent arc moving contact pieces and main moving contact pieces, and the insulating sheet can separate the main contacts on the adjacent arc moving contact pieces and main moving contact pieces;

[0007] A rib plate is arranged on the moving contact support, and the rib plate is clamped between adjacent arc moving contact pieces and main moving contact pieces.

[0008] Further, an insulating plate slot for inserting and cooperating with the insulating sheet is arranged on the moving contact support.

[0009] Further, the insulating sheet is fixed on the circuit breaker housing or the arc extinguishing chamber, and the insulating sheet is slidably inserted into the insulating plate slot.

[0010] Further, the number of the insulating sheets is two, and the two insulating sheets are distributed at intervals; the several arc moving contact pieces are arranged side by side between the two insulating sheets.

[0011] Further, the number of the rib plates is two, and the two rib plates are spaced apart; the plurality of arc moving contact pieces are arranged side by side and clamped between the two rib plates.

[0012] Further, it further includes support side plates and a rotating shaft, wherein: the number of the support side plates is two, and the two support side plates are respectively installed on opposite sides of the moving contact support; the plurality of moving contact pieces are sleeved on the rotating shaft side by side, and both ends of the rotating shaft are respectively connected to the two support side plates.

[0013] Further, a rotating shaft limiting groove for plugging and matching with the rotating shaft is arranged on the moving contact support.

[0014] Further, the rotating shaft limiting groove is arranged on the rib plate.

[0015] Further, it further includes a support seat, a moving connection bus bar and a plurality of flexible connections, wherein: the moving connection bus bar is fixedly arranged on the support seat; one ends of the plurality of flexible connections are respectively and correspondingly connected to the plurality of moving contact pieces, and the other ends of the plurality of flexible connections are all connected to the moving connection bus bar.

[0016] The second object of the present utility model is a circuit breaker, including the moving contact structure described in any one of the above.

[0017] The beneficial effects of the present utility model:

[0018] The present utility model provides a moving contact structure and a circuit breaker. The moving contact structure includes a plurality of moving contact pieces, a moving contact support and an insulating sheet, wherein: the plurality of moving contact pieces are arranged side by side on the moving contact support, and the plurality of moving contact pieces are divided into a plurality of arc moving contact pieces and a plurality of main moving contact pieces; the insulating sheet is arranged between adjacent arc moving contact pieces and main moving contact pieces, and the insulating sheet can separate the main contact points on the adjacent arc moving contact pieces and main moving contact pieces; rib plates are arranged on the moving contact support, and the rib plates are clamped between adjacent arc moving contact pieces and main moving contact pieces.

[0019] In the above structure, since the main contact points on adjacent arc moving contact pieces and main moving contact pieces are separated by the insulating sheet, the insulating sheet can block the arc and / or charged particles at the arc moving contact piece, avoiding the transfer of the arc and / or charged particles from the arc moving contact piece to the main contact point, thereby avoiding the breakdown of the main contact point and improving the breaking performance. In addition, adjacent arc moving contact pieces and main moving contact pieces are accurately positioned by rib plates, improving the positioning accuracy of the moving contact pieces; moreover, compared with the method of positioning by using a bushing, the method of positioning by using rib plates does not require the processing and assembly of bushings, making the assembly process more convenient, improving the production efficiency and reducing the labor cost. Description of the Drawings

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for 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 also be obtained based on these drawings.

[0021] Figure 1 Schematic diagram of the moving contact structure provided by the embodiment of the present invention;

[0022] Figure 2 Schematic diagram of the moving contact support and the insulating plate provided by the embodiment of the present invention;

[0023] Figure 3 Schematic diagram of the moving contact support provided by the embodiment of the present invention;

[0024] Figure 4 Assembly diagram of the moving contact structure and the arc extinguishing chamber provided by the embodiment of the present invention.

[0025] Icon:

[0026] 1 - Moving contact support; 11 - Rib plate; 12 - Insulating plate slot; 13 - Rotating shaft limit slot; 14 - Block; 2 - Arc moving contact piece; 21 - Arc moving contact point; 3 - Main moving contact piece; 31 - Main moving contact point; 4 - Insulating sheet; 5 - Support side plate; 6 - Rotating shaft; 7 - Support base; 8 - Moving connection bus bar; 9 - Flexible connection; 100 - Arc extinguishing chamber. Specific embodiments

[0027] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0028] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] It should be noted that in the description of the present utility model, 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 utility model can be understood according to specific circumstances.

[0030] In the existing moving contact structure with arc contacts on the market, the moving contact structure includes a plurality of moving contact pieces and a moving contact support 1. The plurality of moving contact pieces are arranged side by side on the moving contact support 1, and the plurality of moving contact pieces are divided into several arc moving contact pieces 2 and several main moving contact pieces 3. Due to the design requirement of the small size of the circuit breaker, the distance between the arc moving contact pieces 2 and the main moving contact pieces 3 is small, resulting in that when high voltage is interrupted, the arc is easily broken through from the arc moving contact point 21 on the arc moving contact piece 2 to the main contact point 31 on the main moving contact piece 3, and continuous arcing occurs between the main contact points 31, causing the interruption failure.

[0031] Based on this, on the one hand, an embodiment of the present utility model provides a moving contact structure. Referring to Figure 1 , the moving contact structure further includes an insulating sheet 4. The insulating sheet 4 is arranged between adjacent arc moving contact pieces 2 and main moving contact pieces 3, and the insulating sheet 4 can separate the main contact points 31 on the adjacent arc moving contact pieces 2 and main moving contact pieces 3; a rib plate 11 is arranged on the moving contact support 1, and the rib plate 11 is clamped between adjacent arc moving contact pieces 2 and main moving contact pieces 3.

[0032] In the above structure, since the main contact points 31 on the adjacent arc moving contact pieces 2 and main moving contact pieces 3 are separated by the insulating sheet 4, the insulating sheet 4 can block the arc and / or charged particles at the arc moving contact piece 2, avoiding the transfer of the arc and / or charged particles from the arc moving contact piece 2 to the main contact point 31, thereby avoiding the breakdown of the main contact point 31 and the corresponding static contact to generate an arc, and improving the interruption performance. In addition, the adjacent arc moving contact pieces 2 and main moving contact pieces 3 are positioned by the rib plate 11, preventing the axial movement of the moving contact pieces during rotation, improving the positioning accuracy of the moving contact pieces; moreover, compared with the method of positioning by using a bushing, the method of positioning by using the rib plate 11 does not require the processing and assembly of the bushing, making the assembly process more convenient, improving the production efficiency and reducing the labor cost.

[0033] In this embodiment, the number of the insulating sheets 4 is two, and the two insulating sheets 4 are distributed at intervals; several arc moving contact pieces 2 are arranged side by side between the two insulating sheets 4; several main moving contact pieces 3 are arranged on one side of each insulating sheet 4 away from the arc moving contact piece 2.

[0034] In other embodiments, all the main moving contact pieces 3 can be arranged on the same side of several arc moving contact pieces 2; the number of the insulating sheets 4 is one and is arranged between the arc moving contact pieces 2 and the main moving contact pieces 3.

[0035] It should be noted that the number and arrangement of the arc moving contact piece 2 and the active contact piece 3 are adjusted according to the specifications of the product, and are not limited herein.

[0036] Referring to Figure 2 and Figure 3 , an insulating plate slot 12 for plugging and cooperating with the insulating piece 4 is provided on the moving contact support 1. In this embodiment, the number of the insulating plate slots 12 is two and corresponds to the two insulating pieces 4 one by one; one end of the insulating piece 4 is inserted into the corresponding insulating plate slot 12, and the other end thereof extends toward the static contact, so that the active contact 31 on the active contact piece 3 and the arc moving contact piece 2 can be completely separated, and the arc and / or charged particles at the arc moving contact piece 2 will not transfer to the active contact 31.

[0037] Furthermore, the number of the rib plates 11 is two, and the two rib plates 11 are spaced apart; a plurality of arc moving contact pieces 2 are arranged side by side and clamped between the two rib plates 11. The rib plates 11 can accurately position the moving contact piece and prevent the moving contact piece from axially moving during rotation, ensuring that the moving contact piece can always be in good contact with the static contact.

[0038] Continuing to refer to Figure 1 , the moving contact structure further includes support side plates 5 and a rotating shaft 6, wherein: the number of the support side plates 5 is two, and the two support side plates 5 are respectively installed on opposite sides of the moving contact support 1; a plurality of moving contact pieces are sleeved on the rotating shaft 6 side by side, and both ends of the rotating shaft 6 are respectively connected to the two support side plates 5.

[0039] Specifically, on opposite two side surfaces of the moving contact support 1, there are respectively provided blocks 14 for plugging into the corresponding support side plates 5. The relative positions of the moving contact support 1 and the support side plates 5 can be limited by the blocks 14, facilitating the assembly of the two. After the two support side plates 5 are initially installed on opposite sides of the moving contact support 1 through the blocks 14, the two support side plates 5 can be fixed to the moving contact support 1 by fasteners such as screws.

[0040] Continuing to refer to Figure 3 , a rotating shaft limiting groove 13 for plugging and cooperating with the rotating shaft 6 is provided on the moving contact support 1. When assembling the above moving contact structure, first, the moving contact pieces are sleeved on the rotating shaft 6 in sequence; then, the rotating shaft 6 is pushed into the rotating shaft limiting groove 13, and at the same time, the rib plate 11 is inserted between the adjacent arc moving contact piece 2 and the active contact piece 3; finally, the rotating shaft through holes on the two support side plates 5 are respectively aligned with both ends of the rotating shaft 6 and pushed in, and the two support side plates 5 are respectively installed on opposite sides of the moving contact support 1. Thus, the assembly of the moving contact piece, the moving contact support 1, the support side plates 5 and the rotating shaft 6 is completed.

[0041] During the assembly process of the moving contact support 1 provided in this embodiment, there is no need to install a bushing, which improves the assembly efficiency. Moreover, the position of the rotating shaft 6 relative to the moving contact support 1 can be restricted by the rotating shaft limiting groove 13 on the moving contact support 1. This not only facilitates the assembly but also can support the abdomen of the rotating shaft 6, enhancing the structural strength of the rotating shaft 6.

[0042] Based on the above structure, a rotating shaft limiting groove 13 is provided on the rib plate 11. In the above structure, while the rib plate 11 plays a positioning role, it can also support the rotating shaft 6.

[0043] Continue to refer to Figure 1 , the moving contact structure further includes a support seat 7, a moving connection bus bar 8, and a plurality of flexible connections 9, where: the moving connection bus bar 8 is fixedly arranged on the support seat 7; one end of each of the plurality of flexible connections 9 is correspondingly connected to a plurality of moving contact pieces, and the other ends of the plurality of flexible connections 9 are all connected to the moving connection bus bar 8. In this embodiment, the flexible connection 9 is specifically a flexible copper wire.

[0044] In the above structure, the moving connection bus bar 8 is used to connect to an external circuit; the moving connection bus bar 8, the plurality of flexible connections 9, and the plurality of moving contact pieces are connected in sequence for current to flow through.

[0045] Refer to Figure 4 , the insulating sheet 4 is fixedly arranged on the circuit breaker housing or the arc extinguishing chamber 100, and the insulating sheet 4 is slidably inserted into the insulating plate slot 12. The setting of the insulating plate slot 12 can, on the one hand, prevent interference between the moving contact support 1 and the insulating sheet 4 during the rotation of the moving contact support 1, and on the other hand, limit the displacement of the insulating sheet 4 in its thickness direction to prevent excessive shaking of the insulating sheet 4 under the impact of the air flow.

[0046] Specifically, the insulating sheet 4 is installed on the circuit breaker housing or the arc extinguishing chamber 100 by fixing methods such as clamping or screwing; the length of the arc moving contact piece 2 is greater than that of the main moving contact piece 3, and the arc moving contact piece 2 extends into the arc extinguishing cavity of the arc extinguishing chamber 100; the two insulating sheets 4 correspond to the two side cavity walls of the arc extinguishing chamber 100 one by one, and each insulating sheet 4 extends from the corresponding side cavity wall of the arc extinguishing chamber 100 towards the moving contact support 1 and is inserted into the corresponding insulating plate slot 12; several main moving contact pieces 3 are arranged on one side of each insulating sheet 4 away from the arc moving contact piece 2. During the opening and closing of the circuit breaker, the moving contact support 1 drives the moving contact pieces thereon to rotate around the axis of the rotating shaft 6. At the same time, the insulating sheet 4 can slide relative to the corresponding insulating plate slot 12, thus achieving the effect of separating the arc from the main moving contact piece 3 and enhancing the breaking performance of the product.

[0047] Furthermore, the slot width of the insulating plate slot 12 is greater than the thickness of the insulating sheet 4, and there are gaps between the two side slot walls of the insulating plate slot 12 and the insulating sheet 4. This can avoid the frictional resistance generated by the moving contact support 1 on the insulating sheet 4 during rotation, and improve the stability of the moving contact during rotation.

[0048] The second aspect embodiment of the present invention provides a circuit breaker, and the circuit breaker includes the moving contact structure described in any of the above embodiments. Therefore, the circuit breaker at least has the technical effects of the above moving contact structure, which will not be elaborated here.

[0049] 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 it; 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. A moving contact structure, comprising a plurality of moving contact pieces and a moving contact support (1), wherein the plurality of moving contact pieces are arranged side by side on the moving contact support (1), and the plurality of moving contact pieces are divided into a plurality of arc moving contact pieces (2) and a plurality of active moving contact pieces (3), characterized in that, It further includes an insulating sheet (4), which is arranged between the adjacent arc moving contact pieces (2) and the main moving contact piece (3), and the insulating sheet (4) can separate the main contact points (31) on the adjacent arc moving contact pieces (2) and the main moving contact piece (3); A rib plate (11) is arranged on the moving contact support (1), and the rib plate (11) is clamped between the adjacent arc moving contact pieces (2) and the main moving contact piece (3).

2. The moving contact structure according to claim 1, wherein, An insulating plate slot (12) which is in plug-in fit with the insulating sheet (4) is arranged on the moving contact support (1).

3. The moving contact structure according to claim 2, characterized in that, The insulating sheet (4) is fixed on the circuit breaker housing or the arc extinguishing chamber (100), and the insulating sheet (4) is slidably inserted into the insulating plate slot (12).

4. The moving contact structure according to claim 1, characterized in that, The number of the insulating sheets (4) is two, and the two insulating sheets (4) are distributed at intervals; the plurality of arc moving contact pieces (2) are arranged side by side between the two insulating sheets (4).

5. The moving contact structure according to claim 1, characterized in that, The number of the rib plates (11) is two, and the two rib plates (11) are distributed at intervals; the plurality of arc moving contact pieces (2) are clamped side by side between the two rib plates (11).

6. The moving contact structure according to claim 1, characterized in that It further includes support side plates (5) and a rotating shaft (6), wherein: the number of the support side plates (5) is two, and the two support side plates (5) are respectively installed on the opposite sides of the moving contact support (1); the plurality of moving contact pieces are sleeved on the rotating shaft (6) side by side, and the two ends of the rotating shaft (6) are respectively connected to the two support side plates (5).

7. The moving contact structure according to claim 6, characterized in that, A rotating shaft limiting groove (13) which is in plug-in fit with the rotating shaft (6) is arranged on the moving contact support (1).

8. The moving contact structure according to claim 7, characterized in that, The rotating shaft limiting groove (13) is arranged on the rib plate (11).

9. The moving contact structure according to claim 1, characterized in that It further includes a support base (7), a moving connection bus bar (8) and a plurality of flexible connections (9), wherein: the moving connection bus bar (8) is fixed on the support base (7); one ends of the plurality of flexible connections (9) are correspondingly connected to the plurality of moving contact pieces respectively, and the other ends of the plurality of flexible connections (9) are all connected to the moving connection bus bar (8).

10. A circuit breaker, characterized in that, It includes the moving contact structure according to any one of claims 1 to 9.

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