Contact arc extinguishing system

Abstract

The utility model discloses a contact arc extinguishing system, which comprises a static contact, an arc extinguishing chamber and a magnetic conductive assembly, and is characterized in that the arc extinguishing chamber is positioned near the static contact; the arc extinguishing chamber comprises arc extinguishing grid sheet groups which are sequentially stacked along one direction; the static contact comprises a contact part, the magnetic conduction assembly comprises two side magnetic conduction sheets and a magnetic conduction block, the magnetic conduction block is located below the contact part, and the two side magnetic conduction sheets are arranged on the two sides of the contact part respectively; wherein the two side magnetic conductive sheets extend in the direction of the magnetic conductive block to form extension parts, and the extension parts abut against the magnetic conductive block; although the split type magnetic conduction assembly is adopted, the magnetic conduction assembly still has the advantage of being good in magnetic conduction effect.

Description

Technical Field

[0001] The present application relates to the electrical field of low-voltage switches, and in particular to a contact arc extinguishing system. Background Art

[0002] As a protective switch, the arc extinguishing performance of the circuit breaker will directly affect the breaking performance of the circuit breaker.

[0003] In molded case circuit breakers, in order to improve the arc extinguishing performance, a gas-generating structure and a magnetic conductive structure are often added at the breaking position, that is, near the static contact. The gas-generating structure is used to generate gas to increase the gas pressure, and the magnetic conductive structure is used to increase the magnetic field force. Then, magnetic blowing (gas pressure combined with magnetic field force) is used in combination to improve the arc extinguishing performance.

[0004] As for the magnetic field force, a complete annular magnetic field force around the breaking position is undoubtedly the best choice, but the complete annular magnetic field force (annular magnetic conductive part) is difficult to design and may affect the movement of the moving contact. Therefore, the second best option is to choose an integrated U-shaped magnetic conductive part. This U-shaped magnetic conductive part is arranged on the left and right sides of the static contact and the bottom. It does bring better results, but there are also some shortcomings. The shape of the gas-generating structure needs to match it, which will make the gas-generating structure very complicated. For example, the structure disclosed in CN204558301U adopts this structure.

[0005] As a second best option, there is also a method on the market of setting magnetic conductive parts in three directions of the static contact, that is, setting a magnetic conductive part on the left and right sides and the bottom of the static contact respectively. The independent structure of the three magnetic conductive parts in this structure can simplify the setting of the gas production structure, but the magnetic field force is still not very ideal. For example, CN106971928A discloses this structure.

[0006] Therefore, how to reasonably arrange the split magnetic conductive component structure to ensure its magnetic field force as much as possible is also a direction worthy of research. Summary of the invention

[0007] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide a contact arc extinguishing system.

[0008] The present application provides: a contact arc extinguishing system, which includes a static contact, an arc extinguishing chamber and a magnetic conductive component, wherein the arc extinguishing chamber is located near the static contact; the arc extinguishing chamber includes a group of arc extinguishing grids stacked in sequence along a direction; the static contact includes a contact portion, and the magnetic conductive component includes two side magnetic conductive sheets and a magnetic conductive block, wherein the magnetic conductive block is located below the contact portion, and the two side magnetic conductive sheets are respectively arranged on both sides of the contact portion; wherein the two side magnetic conductive sheets are both extended in the direction of the magnetic conductive block to form an extension portion, and the extension portion is in conflict with the magnetic conductive block.

[0009] This structure, using a split magnetic conductive component, will be beneficial to the setting of the gas production structure. The extensions of the two side magnetic conductive sheets will conflict with the magnetic conductive block, which can ensure the formation of a magnetic field force similar to a "U-shaped magnetic conductive part". Although this magnetic field force is not as good as that of an integrated U-shaped magnetic conductive part, compared with the split and scattered magnetic conductive structure in the prior art, the magnetic field force will be better and more conducive to arc extinguishing.

[0010] In some embodiments of the present application, the magnetic conductive block has a surface adjacent to the contact portion, which surface is an upper surface, and the extension portion conflicts with the upper surface; or, the magnetic conductive block has two surfaces parallel to the side magnetic conductive sheets, both surfaces are side surfaces, and the extension portion conflicts with the corresponding side surfaces respectively.

[0011] With this structure, the extension portion can be in contact with the upper surface of the magnetic conductive block or the side surface of the magnetic conductive block. In either case, a magnetic field force similar to a "U-shaped magnetic conductive part" can be formed.

[0012] In some embodiments of the present application, two side gas-generating parts and a static contact cover are included; the two side magnetic conductive sheets are respectively located in the two side gas-generating parts, and the extension portion is arranged beyond the side gas-generating parts; the static contact cover is arranged at the periphery of the contact portion, and the static contact cover is located below the two side gas-generating parts in the height direction; a through hole is opened on the static contact cover, and the extension portion penetrates through the through hole until it contacts the magnetic conductive block.

[0013] With this structure, the design of the static contact cover and the side gas generating part can generate gas when breaking, which is beneficial to improving the arc extinguishing effect. The design of the through hole will facilitate the contact between the extension part and the magnetic conductive block.

[0014] In some embodiments of the present application, the side magnetic conductive sheet includes a main body portion, an extension portion is located at one end of the main body portion, and a size of the extension portion is smaller than a size of the main body portion.

[0015] The use of this structure will be beneficial to the structural design and processing of the side magnetic guide sheet.

[0016] In some embodiments of the present application, the magnetic conductive block includes at least two bottom magnetic conductive sheets and a fastener, and the bottom magnetic conductive sheets are stacked in sequence and fastened by the fastener.

[0017] Adopting this structure will be beneficial to the formation of magnetic conductive blocks.

[0018] In some embodiments of the present application, the arc-extinguishing grid group includes a plurality of arc-extinguishing grids, each of which includes two grid feet; it also includes two side gas-generating parts, each of which is correspondingly arranged next to a grid foot; the side gas-generating parts at least block the grid feet of two-thirds of the arc-extinguishing grids.

[0019] By adopting this structure, the gas generated by the side gas producing component can be used to improve the arc extinguishing effect.

[0020] In some embodiments of the present application, the static contact also includes a wiring portion, a first bending portion, a mounting portion and a second bending portion, and the wiring portion, the first bending portion, the mounting portion, the second bending portion and the contact portion are connected in sequence; the mounting portion, the second bending portion and the contact portion form a U-shaped structure, and the contact portion is used to set a static contact.

[0021] The use of this static contact structure will be beneficial to the molding of the static contact and the design of the magnetic conductive part.

[0022] In some embodiments of the present application, the width dimension of the contact portion is smaller than the width dimension of the magnetic conductive block, and the width dimension of the magnetic conductive block is smaller than the width dimension of the mounting portion.

[0023] This structure will facilitate the contact between the magnetic conductive block and the two side magnetic conductive sheets.

[0024] In some embodiments of the present application, a static contact cover is provided on the static contact, and the static contact cover surrounds the periphery of the contact portion; the static contact cover includes two side branches, and the two side branches are located on both sides of the contact portion, and abutment protrusions are provided on the side branches, and the abutment protrusions abut on the corresponding contact portion.

[0025] Adopting this structure will be beneficial to the installation of the static contact cover.

[0026] In some embodiments of the present application, the stationary contact cover further includes a lap portion, and the lap portion abuts against a connection position between the wiring portion and the first bending portion.

[0027] Adopting this structure will be beneficial to the installation of the static contact cover.

[0028] In some embodiments of the present application, the stationary contact cover further includes a shielding portion, which connects the two side branches and shields at least a portion of the second bent portion.

[0029] With this structure, the shielding part can be used to protect this part, so as to prevent the arc from burning this part during disconnection and affecting the electrical performance.

[0030] In some embodiments of the present application, the arc extinguishing grid group includes a plurality of arc extinguishing grids, including a first arc extinguishing grid and a tail arc extinguishing grid. The first arc extinguishing grid is provided with a static arc-strike foot, and the tail arc extinguishing grid is provided with a dynamic arc-strike foot.

[0031] The use of this structure will be beneficial to attracting the arc generated during disconnection and improving the arc extinguishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 A three-dimensional diagram of the contact arc extinguishing system of Embodiment 1 of the present application is shown;

[0034] Figure 2 A schematic diagram of the contact arc extinguishing system of Embodiment 1 of the present application after the static contact, static contact cover and magnetic conductive block are removed is shown;

[0035] Figure 3 A schematic diagram showing the coordination of the static contact, the static contact cover, the magnetic conductive block, etc. in the contact arc extinguishing system of Embodiment 1 of the present application is shown;

[0036] Figure 4 for Figure 3 Schematic diagram after removing the static contact cover;

[0037] Figure 5 It shows a schematic structural diagram of an arc extinguishing chamber in a contact arc extinguishing system of Embodiment 1 of the present application;

[0038] Figure 6 A schematic structural diagram of a stationary contact cover in a contact arc extinguishing system in Example 1 of the present application is shown. DETAILED DESCRIPTION

[0039] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0040] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0041] In addition, the terms "primary" and "secondary" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "primary" and "secondary" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0042] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] In the present application, unless otherwise clearly specified and limited, when a main feature is “above” or “below” a second feature, it can mean that the main feature and the second feature are in direct contact, or the main feature and the second feature are in indirect contact through an intermediate medium. Moreover, when a main feature is “above”, “above” or “above” a second feature, it can mean that the main feature is directly above or obliquely above the second feature, or simply means that the main feature is higher in level than the second feature. When a main feature is “below”, “below” or “below” a second feature, it can mean that the main feature is directly below or obliquely below the second feature, or simply means that the main feature is lower in level than the second feature. Example

[0044] like Figure 1-Figure 6 As shown, the embodiment of the present application provides a contact arc extinguishing system, which is applied to a molded case circuit breaker. Of course, the molded case circuit breaker referred to here refers to the type of circuit breaker, not just a certain circuit breaker. Such molded case circuit breakers include thermal magnetic molded case circuit breakers, electronic molded case circuit breakers, molded case circuit breakers with leakage protection function, measuring switches, fusion switches, reclosing circuit breakers, etc.

[0045] The contact arc extinguishing system includes a static contact 100 , an arc extinguishing chamber 200 , a gas generating component 300 and a magnetic conductive component 400 .

[0046] Here, the static contact 100 includes a wiring portion 101, a first bending portion 102, a mounting portion 103, a second bending portion 104 and a contact portion 105. Here, the wiring portion 101, the first bending portion 102, the mounting portion 103, the second bending portion 104 and the contact portion 105 are sequentially connected.

[0047] The connection part 101 is mainly used to connect external wires, connection noses, etc.

[0048] The mounting portion 103 is used to be fixed to the base of the circuit breaker, and the fixing method here is bolt fastening.

[0049] The first bending portion 102 is used to connect the wiring portion 101 and the mounting portion 103 .

[0050] The contact portion 105 is used to fix the static contact, and the static contact 100 makes contact with the moving contact.

[0051] The second bending portion 104 is used to connect the contact portion 105 to the mounting portion 103 .

[0052] Here, the mounting portion 103 and the contact portion 105 are connected via the second bent portion 104 to form a U-shaped structure. The width dimension of the contact portion 105 is smaller than the width dimension of the mounting portion 103 .

[0053] The arc extinguishing chamber 200 is located near the static contact 100, and it includes two side plates 201 and an arc extinguishing grid group 202. In this embodiment, there are 11 arc extinguishing grids in the arc extinguishing grid group 202. Here, the arc extinguishing grids are stacked in sequence along the first direction, that is, the height direction. Here, the first arc extinguishing grid is the first arc extinguishing grid 2021, and the last arc extinguishing grid is the tail arc extinguishing grid 2022. Here, the first arc extinguishing grid 2021 is provided with a static arc-strike foot 2021a, which extends to the vicinity of the contact portion 105 and is used to attract the arc of the moving and static contacts 100 at the initial position when disconnecting. Here, the tail arc extinguishing grid 2022 is provided with a moving arc-strike foot 2022a, which is used to attract the arc of the moving contact at the end position when disconnecting. Of course, the number of arc extinguishing grids in the above example can also be other numbers. Similarly, the first direction is not limited to the height direction, and it can also be an arc-shaped trajectory, such as the movement trajectory of a moving contact.

[0054] The gas generating assembly 300 includes a stationary contact cover 301 and two side gas generating parts 302 .

[0055] Here, the static contact cover 301 surrounds the contact portion 105. Here, the static contact cover 301 includes two side branches 3021, a shielding portion 3022, and a lap portion 3023. The lap portion 3023 and the shielding portion 3022 are connected through the two side branches 3021. Here, the lap portion 3023 is overlapped at the connection position between the wiring portion 101 and the first bending portion 102. Here, the two side branches 3021 are respectively located on both sides of the contact portion 105, and abutting protrusions 3021a are provided on the side branches 3021. The side branches 3021 abut against the corresponding side of the contact portion 105 through the abutting protrusions 3021a. Here, the shielding portion 3022 shields a part of the second bending portion 104.

[0056] The side gas generating member 302 is used to shield the arc extinguishing feet of the arc extinguishing grid. Since each arc extinguishing grid has two grid feet 2023. Each side gas generating member 302 is located at the corresponding grid foot 2023, shielding the corresponding grid foot 2023 in the arc extinguishing grid group 202. Although the present embodiment exemplifies a structure in which all arc extinguishing grid feet 2023 are shielded, other methods may also be used, such as shielding the grid feet 2023 of two-thirds of the arc extinguishing grids, which may also achieve a better arc extinguishing effect.

[0057] The magnetic conductive component 400 includes two side magnetic conductive sheets 401 and a magnetic conductive block 402. The magnetic conductive sheets are arranged on both sides of the contact portion 105, and the magnetic conductive block 402 is located below the contact portion 105 (in a U-shaped structure formed by the mounting portion 103, the contact portion 105, and the second bending portion 104). An extension portion 401a is provided on the side magnetic conductive sheet 401, and the extension portion 401a extends toward the magnetic conductive block 402. The extension portion 401a is in direct contact with the magnetic conductive block 402. In this embodiment, the extension portion 401a is in contact with the upper surface of the magnetic conductive block 402, that is, the surface of the magnetic conductive block 402 adjacent to the contact portion 105. In addition to this, the extension portion 401a may also be in contact with the side surface of the magnetic conductive block 402, such as the side surface of the magnetic conductive block 402 in the width direction.

[0058] Here, the two side magnetic conductive sheets 401 are respectively embedded in the corresponding side gas generating parts 302, and the extension part 401a is exposed from the side gas generating parts 302. In other words, the side magnetic conductive sheet 401 has a main body part 401b and an extension part 401a, and the extension part 401a is located below the main body part 401b, the main body part 401b is in the side gas generating part 302, and the extension part 401a is exposed outside the side gas generating part 302. Here, the size of the extension part 401a is smaller than that of the main body part 401b.

[0059] The magnetic conductive block 402 is made of 7 bottom magnetic conductive sheets 402a stacked in sequence and fastened by fasteners. Here, the fasteners are riveted shafts (not shown in the figure). Of course, bolts can also be used for fixing. Here, the stacking direction of the bottom magnetic conductive sheets 402a is the length direction of the static contact 100.

[0060] The dimension of the magnetic conductive block 402 in the width direction is larger than that of the contact portion 105, but smaller than that of the mounting portion 103. Since the side branch portion 3021 of the stationary contact cover 301 is located just above the magnetic conductive block 402, a through hole 3021b is provided on the side branch portion 3021, and the through hole 3021b can also allow the extension portion 401a to penetrate and contact the magnetic conductive block 402.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0062] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A contact arc extinguishing system, comprising a stationary contact, an arc extinguishing chamber and a magnetic conductive assembly, wherein the arc extinguishing chamber is located near the stationary contact; the arc extinguishing chamber comprises a group of arc extinguishing grids stacked in sequence along one direction; the stationary contact comprises a contact portion, and the magnetic conductive assembly comprises two side magnetic conductive sheets and a magnetic conductive block, wherein the magnetic conductive block is located below the contact portion, and the two side magnetic conductive sheets are disposed on both sides of the contact portion; characterized in that: The two side magnetic conductive sheets are both extended in the direction of the magnetic conductive block to form an extension portion, and the extension portion is in conflict with the magnetic conductive block.

2. A contact arc extinguishing system according to claim 1, characterized in that: The magnetic conductive block has a surface adjacent to the contact portion, which surface is an upper surface, and the extension portion conflicts with the upper surface; or, the magnetic conductive block has two surfaces parallel to the side magnetic conductive sheets, both surfaces are side surfaces, and the extension portion conflicts with the corresponding side surfaces respectively.

3. A contact arc extinguishing system according to claim 1 or 2, characterized in that: It includes two side gas-generating parts and a static contact cover; the two side magnetic conductive sheets are respectively located in the two side gas-generating parts, and the extension part is arranged beyond the side gas-generating parts; the static contact cover is arranged at the periphery of the contact part, and the static contact cover is located below the two side gas-generating parts in the height direction; the static contact cover is provided with a through hole, and the extension part penetrates through the through hole until it contacts the magnetic conductive block.

4. A contact arc extinguishing system according to claim 1 or 2, characterized in that: The side magnetic conductive sheet includes a main body, an extension portion is located at one end of the main body, and the size of the extension portion is smaller than the size of the main body; or / and, the magnetic conductive block includes at least two bottom magnetic conductive sheets and fasteners, and the bottom magnetic conductive sheets are stacked in sequence and fastened by fasteners.

5. A contact arc extinguishing system according to claim 1 or 2, characterized in that: The arc-extinguishing grid group includes a plurality of arc-extinguishing grids, each of which includes two grid legs; it also includes two side gas-generating parts, each of which is correspondingly arranged next to a grid leg; the side gas-generating parts at least shield the grid legs of two-thirds of the arc-extinguishing grids.

6. A contact arc extinguishing system according to claim 1, characterized in that: The static contact also includes a wiring portion, a first bending portion, a mounting portion and a second bending portion, wherein the wiring portion, the first bending portion, the mounting portion, the second bending portion and the contact portion are sequentially connected; the mounting portion, the second bending portion and the contact portion form a U-shaped structure, and the contact portion is used to set a static contact point.

7. A contact arc extinguishing system according to claim 6, characterized in that: The width dimension of the contact portion is smaller than the width dimension of the magnetic conductive block, and the width dimension of the magnetic conductive block is smaller than the width dimension of the mounting portion.

8. A contact arc extinguishing system according to claim 6, characterized in that: The static contact is provided with a static contact cover, which surrounds the periphery of the contact portion; the static contact cover includes two side branches, which are located at both sides of the contact portion, and abutment protrusions are provided on the side branches, which abut against the corresponding contact portion.

9. A contact arc extinguishing system according to claim 8, characterized in that: The stationary contact cover further includes an overlapping portion, which abuts against a connection position between the wiring portion and the first bending portion; and / or the stationary contact cover further includes a shielding portion, which connects the two side branches and shields at least a portion of the second bending portion.

10. A contact arc extinguishing system according to claim 1, characterized in that: The arc extinguishing grid group includes a plurality of arc extinguishing grids, including a first arc extinguishing grid and a tail arc extinguishing grid. The first arc extinguishing grid is provided with a static arc striking foot, and the tail arc extinguishing grid is provided with a dynamic arc striking foot.

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