Circuit breaker

Abstract

The utility model discloses a circuit breaker, and the circuit breaker is characterized in that the number of exhaust hole groups is two, the two exhaust hole groups are arranged at an interval in a second direction, and the first direction and the second direction are two directions which are perpendicular to each other; the movable end of the flexible blocking piece is close to the cover body, and the cover body extends towards the base to form a segmentation rib. In the first direction, the segmentation rib is located between a part of the arc extinguish chamber and the plugboard. In the second direction, the division rib is located between the two exhaust hole groups; part of gas from the direction of the arc extinguish chamber is segmented by the segmentation ribs. The device has the characteristic of facilitating opening of the flexible separation blade.

Description

Technical Field

[0001] The present application relates to the electrical field of low-voltage switches, in particular to a circuit breaker. Background Art

[0002] To ensure rapid exhaust, existing molded case circuit breakers feature inserts and flexible shields between the arc extinguishing chamber and the terminal slot. The inserts are provided with through-holes. The flexible shields, positioned between the inserts and the terminal slot, block the through-holes when inactive, preventing foreign particles from entering the circuit breaker. During high-current interruption, large amounts of gas generated inside the circuit breaker can bend the flexible shields, exposing the through-holes. This allows the gas to quickly escape through the through-holes, preventing the circuit breaker from rupturing due to excessive internal pressure.

[0003] This is the case with the structure disclosed in CN115631977A. Although the existing structure can also allow the flexible baffle to be blown open, the opening speed of the flexible baffle in this structure is still not very ideal and there is still the possibility of further improvement. Summary of the Invention

[0004] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide a circuit breaker.

[0005] A circuit breaker comprises a base, a cover, an arc extinguishing chamber, an insert, and a flexible shield. The cover is fixed above the base, and the base is provided with a contact chamber and a terminal slot in a first direction. The lower end of the arc extinguishing chamber is provided in the contact chamber. The insert and the flexible shield are plugged into the base and positioned between the contact chamber and the terminal slot. The flexible shield is positioned on a surface of the insert near the terminal slot. The insert is provided with an exhaust hole group. When the flexible shield is not activated, the exhaust hole group is blocked. When interrupting a large current, the flexible shield is bent by gas from the direction of the arc extinguishing chamber, exposing the exhaust hole group. There are two exhaust hole groups, which are spaced apart in a second direction, and the first direction and the second direction are mutually perpendicular. The movable end of the flexible shield is positioned near the cover, and a dividing rib extends from the cover toward the base. In the first direction, the dividing rib is positioned between a portion of the arc extinguishing chamber and the insert. In the second direction, the dividing rib is positioned between the two exhaust hole groups. The dividing rib divides a portion of the gas from the direction of the arc extinguishing chamber.

[0006] In some embodiments of the present application, the cover body has a receiving groove corresponding to the contact chamber, the lower end of the arc extinguishing chamber is arranged in the contact chamber, and the upper end of the arc extinguishing chamber is in the receiving groove; the arc extinguishing chamber has at least 6 arc extinguishing grids, and a first avoidance space is formed between the top two or three arc extinguishing grids of the arc extinguishing chamber and the plug-in plate, and the dividing rib extends from the bottom of the receiving groove into the first avoidance space.

[0007] In some embodiments of the present application, a first slot is provided on the base, and the plug-in board and the flexible baffle are plugged into the first slot.

[0008] In some embodiments of the present application, the cover body extends toward the base with a limiting rib, the limiting rib and the dividing rib have an accommodation gap in the first direction, and one end of the inserting plate close to the cover body is in the accommodation gap.

[0009] In some embodiments of the present application, a static contact is further provided in the contact chamber and the terminal slot, and a static contact cover is provided on the static contact; the static contact cover includes a plug-in portion, and the plug-in portion is inserted into the first slot; in the first direction, the plug-in portion is located on the side of the plug-in board close to the arc extinguishing chamber.

[0010] In some embodiments of the present application, a through slot is provided on the plug-in portion, and the through slot is connected to at least one exhaust hole in the exhaust hole group, so that part of the gas from the direction of the arc extinguishing chamber enters the exhaust hole through the through slot.

[0011] In some embodiments of the present application, there are two through slots on the plug-in portion, and the two through slots are spaced apart in the second direction and are respectively connected to at least one exhaust hole in the two exhaust hole groups.

[0012] In some embodiments of the present application, the exhaust hole group includes a first exhaust hole and a second exhaust hole, the second exhaust hole is larger than the first exhaust hole, and the through groove is connected to the second exhaust hole.

[0013] In some embodiments of the present application, the static contact includes a wiring segment, which is located in a wiring terminal slot and is provided with a wiring screw; the distance from the side wall of the through slot closest to the wiring segment to the wiring segment is H, and the distance the wiring screw is higher than the wiring segment is h, and H is greater than h.

[0014] In some embodiments of the present application, the circuit breaker is a circuit breaker with at least two poles, and each pole has a contact chamber, a terminal slot, an arc extinguishing chamber, a plug plate, a flexible baffle, and a dividing rib.

[0015] Compared with the prior art, this application has the following advantages:

[0016] Because the movable end of the flexible baffle is positioned close to the cover, that is, the end of the flexible baffle that bears force when it is opened is positioned close to the cover, the dividing ribs divide the gas from the arc extinguishing chamber into two parts, each of which is blown toward the movable end of the flexible baffle through a set of exhaust holes. This facilitates the opening of the flexible baffle and improves the exhaust effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 A perspective view of a circuit breaker according to embodiment 1 of the present application is shown;

[0019] Figure 2 It shows a schematic structural diagram of the circuit breaker cover body of Example 1 of the present application;

[0020] Figure 3 A schematic diagram showing a partially cutaway cover of a circuit breaker according to embodiment 1 of the present application is shown;

[0021] Figure 4 A partial schematic diagram of the flexible baffle, plug-in plate, and arc extinguishing chamber of the circuit breaker in Example 1 of the present application is shown;

[0022] Figure 5 A partial schematic diagram of the arc extinguishing chamber, separation ribs, plug-in plates, and flexible baffles of the circuit breaker of Example 1 of the present application is shown;

[0023] Figure 6 A schematic diagram of the base, static contact cover, and plug-in board of the circuit breaker of Example 1 of the present application is shown;

[0024] Figure 7 A schematic diagram showing a static contact of a circuit breaker according to embodiment 1 of the present application is shown;

[0025] Figure 8 A schematic diagram of a static contact cover of a circuit breaker in Example 1 of the present application is shown;

[0026] Figure 9 A schematic diagram of a flexible baffle of a circuit breaker in Example 1 of the present application is shown;

[0027] Figure 10 A schematic diagram of a plug board of a circuit breaker according to embodiment 1 of the present application is shown. DETAILED DESCRIPTION

[0028] The following describes in detail embodiments of the present application. Examples of these embodiments are illustrated in the accompanying drawings, where identical or similar reference numerals throughout represent identical or similar elements or elements having identical or similar functions. The embodiments described below with reference to the accompanying drawings are illustrative and intended only to explain the present application and are not to be construed as limiting the present application.

[0029] 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", etc., indicating orientations or positional relationships, are 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 device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present application.

[0030] Furthermore, the terms "primary" and "secondary" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "primary" or "secondary" may explicitly or implicitly include one or more of such features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0031] In this application, unless otherwise specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified or limited, "above" or "below" a main feature may mean that the main feature and the second feature are in direct contact, or that the main feature and the second feature are in indirect contact through an intermediary. Furthermore, "above," "above," and "above" a main feature may mean that the main feature is directly above or diagonally above the second feature, or simply means that the main feature is higher in level than the second feature. "below," "below," and "below" a main feature may mean that the main feature is directly below or diagonally below the second feature, or simply means that the main feature is lower in level than the second feature. Example

[0033] like Figures 1-10 As shown, an embodiment of the present application provides a circuit breaker, which is mainly suitable for molded case circuit breakers. Of course, the molded case circuit breakers here include thermal magnetic molded case circuit breakers, electronic molded case circuit breakers, reclosing circuit breakers, measuring switches, fusion switches, etc.

[0034] The circuit breaker includes a base 100 , a cover 200 , an arc extinguishing chamber 300 , a plug-in board 400 , a flexible baffle 500 , a static contact 600 , and the like.

[0035] The base 100 is provided with a contact cavity 101. The circuit breaker of this embodiment is a three-pole circuit breaker, so there are three contact cavities 101. The three contact cavities 101 are arranged in sequence along the second direction Y, where the second direction Y is the width direction of the circuit breaker.

[0036] The base 100 is provided with terminal slots 102, which correspond one-to-one with the contact chambers 101. In this embodiment, there are three terminal slots 102. The terminal slots 102 and the contact chambers 101 are arranged along a first direction X, which is the longitudinal direction of the circuit breaker.

[0037] Each corresponding terminal slot 102 and contact chamber 101 is provided with a static contact 600. Specifically, the static contact 600 includes a wiring segment 601, a connecting segment 602, a mounting segment 603, and a contact segment 604. The wiring segment 601, the connecting segment 602, and the mounting segment 603 are sequentially connected to form a Z-shaped structure. The contact segment 604 is connected to the mounting segment 603 and is higher than the mounting segment 603. Here, the wiring segment 601 is located in the terminal slot 102 and connected to the wiring screw 605, while the mounting segment 603 is located in the contact chamber 101.

[0038] An arc extinguishing chamber 300 is provided in each contact cavity 101 . The arc extinguishing chamber 300 is provided around the contact segment 604 and is used to extinguish the arc generated when the moving and static contacts 600 are separated.

[0039] An insert plate 400 and a flexible shield 500 are inserted between each corresponding terminal slot 102 and contact cavity 101. Specifically, a first slot 103 is defined on the base 100 and is located between the terminal slot 102 and the contact cavity 101. One end of the insert plate 400 and the fixed end of the flexible shield 500 are inserted into the first slot 103.

[0040] Here, the plugboard 400 has two groups of exhaust holes 401, each group having six exhaust holes. The six exhaust holes are arranged sequentially along the third direction Z, which is the height of the circuit breaker. The number of exhaust holes is not limited to six; it can be one, two, or even more, as long as exhaust is sufficient. Here, the two groups of exhaust holes 401 are spaced apart in the second direction Y.

[0041] The flexible shield 500 is located on the surface of the plugboard 400 near the terminal slot 102, with the movable end 501 of the flexible shield 500 positioned near the cover 200. When the flexible shield 500 is not activated, it blocks the exhaust hole group 401. When the flexible shield 500 is activated (bent by gas from the arc extinguishing chamber 300), the exhaust hole group 401 is exposed.

[0042] Here, the cover 200 has a partitioning rib 201 that extends behind a portion of the arc extinguishing chamber 300 and is located between two groups of exhaust holes 401. In other words, in the first direction X, the partitioning rib 201 is located between a portion of the arc extinguishing chamber 300 and the insert plate 400. In the second direction Y, the partitioning rib 201 is located between the two groups of exhaust holes 401.

[0043] The design of the dividing rib 201 allows part of the gas from the arc extinguishing chamber 300 to be divided due to the dividing rib 201 (e.g. Figure 5 The air is then blown toward the movable end 501 of the flexible baffle 500 through the corresponding exhaust hole group 401, so that the movable end 501 of the flexible baffle 500 is subjected to more uniform force, making it easier and faster to open.

[0044] The cover 200 has a receiving slot 202 corresponding to the contact chamber 101. The lower end of the arc extinguishing chamber 300 is located within the contact chamber 101, while the upper end is located within the receiving slot 202. The segmentation rib 201 extends from the bottom of the receiving slot 202 toward the base 100. Here, there are twelve arc quenching grids, but this number is not mandatory and can be any other number, as long as there are at least six. Here, the top two or three arc quenching grids of the arc extinguishing chamber 300 are further away from the plug-in board than the other arc quenching grids, forming a clearance space S between them and the plug-in board. The segmentation rib 201 is located within this clearance space S.

[0045] Such a structure is beneficial to the design of the dividing ribs 201, reserving sufficient space for the dividing ribs and making the overall structure more compact.

[0046] Here, the cover 200 further extends toward the base 100 to form a limiting rib 203. A gap exists between the limiting rib 203 and the dividing rib 201, and the gap is in the first direction X. This gap is the accommodation gap 204, so that the top of the plugboard 400 can be located in the accommodation gap 204. When the flexible baffle 500 is not opened, its movable end 501 is also located in the accommodation gap 204.

[0047] The arrangement of the accommodating gap 204 can reserve a position for installing the plugboard 400 .

[0048] The static contact 600 has a static contact cover 700 that essentially completely shields the connecting section 602 and the mounting section 603, leaving only the wiring section 601 and the contact section 604 exposed. This prevents the connecting section 602 and the mounting section 603 of the static contact 600 from being eroded. The static contact cover 700 comprises a first shielding portion 701, a second shielding portion 702, and a plug-in portion 703. The first shielding portion 701 is positioned above the mounting section 603, shielding it. The second shielding portion 702 is positioned above the connecting section 602, shielding it. The plug-in portion 703 is inserted into the first slot 103. The plug-in portion 703 and the flexible shielding piece 500 are located on either side of the insert board 400.

[0049] With such a design of the static contact cover 700, the plug-in portion 703 and the plug-in board 400 are inserted into the first slot 103 together, and the installation structure is relatively simple and relatively stable after installation.

[0050] The plug-in portion 703 has a through slot 704 , which is connected to the exhaust hole at the bottom, so that part of the gas in the arc extinguishing chamber 300 enters the exhaust hole through the through slot 704 .

[0051] Such a design of the through groove 704 can prevent the gas at the lower part from being completely blocked by the plug-in portion 703 and can also be discharged through the exhaust hole.

[0052] In this embodiment, there are two through slots 704, which are respectively connected to the bottommost exhaust holes of the two exhaust hole groups 401. The design of two through slots 704 will be more conducive to the exhaust of gas.

[0053] The bottommost exhaust hole of the two exhaust hole groups 401 is the second exhaust hole 401b, and the remaining exhaust holes are the first exhaust holes 401a. The size of the second exhaust hole 401b is larger than the first exhaust hole 401a. Such a size design will be more conducive to the exhaust of gas from the bottom.

[0054] For the plug-in portion 703, the distance between the sidewall of the through slot 704 closest to the wiring segment 601 and the wiring segment 601 is H, and the distance that the terminal screw 605 protrudes above the wiring segment 601 is h, where H is greater than h. This prevents arc gas from directly blowing towards the terminal screw 605, thus protecting the terminal screw 605.

[0055] The number of contact chambers 101, terminal slots 102, arc extinguishing chambers 300, plug plates 400, flexible baffles 500, and segmentation ribs 201 described above corresponds to the number of poles in the circuit breaker. For a two-pole circuit breaker, there are two of each of these components. For a four-pole circuit breaker, there are four of each of these components.

[0056] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and integrate different embodiments or examples, and features of different embodiments or examples, described in this specification, unless otherwise inconsistent.

[0057] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are illustrative 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 circuit breaker comprising a base, a cover, an arc extinguishing chamber, an insert, and a flexible shield; the cover is fixed above the base, the base being provided with a contact chamber and a terminal slot in a first direction, the lower end of the arc extinguishing chamber being disposed within the contact chamber; the insert and the flexible shield are plugged into the base and positioned between the contact chamber and the terminal slot, the flexible shield being positioned on a surface of the insert near the terminal slot; the insert is provided with an exhaust hole group, and the flexible shield blocks the exhaust hole group when not in use; when interrupting a high current, the flexible shield bends under the action of gas from the direction of the arc extinguishing chamber, exposing the flexible shield from the exhaust hole group; the circuit breaker is characterized in that: There are two groups of exhaust holes, and the two groups of exhaust holes are spaced apart in the second direction, and the first direction and the second direction are perpendicular to each other; the movable end of the flexible baffle is arranged close to the cover body, and the cover body extends toward the base with a dividing rib; In the first direction, the dividing rib is located between part of the arc extinguishing chamber and the plug-in plate; in the second direction, the dividing rib is located between two groups of exhaust holes; the dividing rib divides part of the gas from the direction of the arc extinguishing chamber.

2. A circuit breaker according to claim 1, characterized in that: The cover body has a receiving groove corresponding to the contact chamber, the lower end of the arc extinguishing chamber is arranged in the contact chamber, and the upper end of the arc extinguishing chamber is in the receiving groove; the arc extinguishing chamber has at least 6 arc extinguishing grids, and a first avoidance space is formed between the top two or three arc extinguishing grids of the arc extinguishing chamber and the plug-in plate, and the dividing rib extends from the bottom of the receiving groove into the first avoidance space.

3. The circuit breaker according to claim 1, wherein: The base is provided with a first slot, and the plug-in board and the flexible baffle are plugged into the first slot.

4. A circuit breaker according to claim 1, characterized in that: The cover body is provided with a limiting rib extending toward the base, the limiting rib and the dividing rib have an accommodation gap in the first direction, and one end of the inserting plate close to the cover body is located in the accommodation gap.

5. A circuit breaker according to claim 3, characterized in that: It also includes a static contact arranged in the contact chamber and the terminal slot, and a static contact cover is provided on the static contact; the static contact cover includes a plug-in portion, which is inserted into the first slot; in the first direction, the plug-in portion is located on the side of the plug-in board close to the arc extinguishing chamber.

6. A circuit breaker according to claim 5, characterized in that: The plug-in portion is provided with a through slot which is communicated with at least one exhaust hole in the exhaust hole group, so that part of the gas from the direction of the arc extinguishing chamber enters the exhaust hole through the through slot.

7. A circuit breaker according to claim 6, characterized in that: There are two through slots on the plug-in portion, and the two through slots are spaced apart in the second direction and are respectively connected to at least one exhaust hole in the two exhaust hole groups.

8. The circuit breaker according to claim 6, characterized in that: The exhaust hole group includes a first exhaust hole and a second exhaust hole. The size of the second exhaust hole is larger than the first exhaust hole. The through groove is connected to the second exhaust hole.

9. The circuit breaker according to claim 6, characterized in that: The static contact includes a wiring segment, which is located in the wiring terminal slot and is provided with a wiring screw. The distance from the side wall of the through slot closest to the wiring segment to the wiring segment is H, and the distance the wiring screw is higher than the wiring segment is h, and H is greater than h.

10. The circuit breaker according to claim 1, characterized in that: The circuit breaker is a circuit breaker with at least two poles, and each pole is provided with a contact chamber, a terminal slot, an arc extinguishing chamber, a plug board, a flexible baffle and a dividing rib.

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