Circuit breaker

Abstract

The utility model discloses a circuit breaker, which comprises a base, four-pole main line slots are sequentially arranged on the base along a first direction, the one-pole main line slot positioned at the outermost edge is a zero line slot, and the other three-pole main line slots are live line slots; the power distribution cabinet further comprises a first cover body and a second cover body, the first cover body is located above all the live wire grooves and used for sealing the live wire grooves, and the second cover body is located above the null line groove and used for sealing the null line groove. The first cover body is fixed with the base through a first fastener, one end, far away from the first cover body, of the second cover body is fixed with the base through a second fastener, and at least one part of one end, close to the first cover body, of the second cover body is pressed on the base by the first cover body; the utility model has the characteristic of simplifying the assembly structure.

Description

Technical Field

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

[0002] Molded case circuit breakers often include 4-pole structures and 3-pole structures. The 4-pole structure is equivalent to having one more N pole than the 3-pole structure.

[0003] Existing molded case circuit breakers consist of a base and a cover. The base has multiple pole spaces—four for a four-pole circuit breaker and three for a three-pole circuit breaker. The cover is secured to the base, enclosing all the pole spaces. Therefore, the housings of both three- and four-pole circuit breakers are not universally compatible.

[0004] With the continued in-depth research in the field of circuit breakers, a molded case circuit breaker with a detachable N-pole has emerged. For example, CN214012851U discloses a circuit breaker with a N-pole structure. This structure features a completely independent N-pole structure, which is assembled with a three-pole circuit breaker to form a four-pole structure. While this circuit breaker structure can use the three-pole circuit breaker as a component of a four-pole circuit breaker, saving significant material, the N-pole structure uses a spliced ​​left and right half-shell structure, which makes it difficult to assemble the internal conductors and requires bolts to secure the surrounding conductors.

[0005] Therefore, how to design a new 4-pole circuit breaker structure that can use some common materials and does not adopt the left and right half-shell connection method is undoubtedly a question worth considering. Summary of the Invention

[0006] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide a circuit breaker.

[0007] The present application provides: a circuit breaker, comprising a base, wherein the base has four-pole main line slots arranged in sequence along a first direction, the one-pole main line slot located at the outermost edge is a neutral line slot, and the remaining three-pole main line slots are all live line slots; wherein the base further comprises a first cover and a second cover, the first cover being located above all the live line slots for enclosing the live line slots, and the second cover being located above the neutral line slots for enclosing the neutral line slots; the first cover being fixed to the base by a first fastener, an end of the second cover away from the first cover being fixed to the base by a second fastener, and at least a portion of an end of the second cover close to the first cover being pressed against the base by the first cover.

[0008] In some embodiments of the present application, the portion of the second cover body pressed by the first cover body includes a pressing portion extending below the first cover body, and an escape groove is opened on the base, and the first cover body is pressed by the pressing portion in the escape groove.

[0009] In some embodiments of the present application, the base includes three phase-to-phase dividing ribs, and the four-pole main line slot is formed by dividing the three phase-to-phase dividing ribs; the phase-to-phase dividing rib between the neutral line slot and the adjacent live line slot is the first phase-to-phase dividing rib, and the avoidance groove is opened on the first phase-to-phase dividing rib.

[0010] In some embodiments of the present application, a slot is provided on the base, and an inserting portion is provided on the second cover, and the inserting portion is inserted into the slot.

[0011] In some embodiments of the present application, the base includes three phase-to-phase dividing ribs, and the four-pole main line slot is formed by dividing the three phase-to-phase dividing ribs; the phase-to-phase dividing rib between the neutral line slot and the adjacent live line slot is the first phase-to-phase dividing rib, and the slot is opened on the first phase-to-phase dividing rib.

[0012] In some embodiments of the present application, a first rotation groove is provided on all phase-to-phase dividing ribs; the circuit breaker includes a rotating shaft, which is rotatably arranged with respect to the first rotation groove; a second rotation groove is provided on the plug-in portion, and the slot direction of the second rotation groove is opposite to the slot direction of the first rotation groove; a portion of the rotating shaft is located in a space jointly formed by the second rotation groove and the first rotation groove of the first phase-to-phase dividing rib.

[0013] In some embodiments of the present application, the base includes three phase-to-phase dividing ribs, the four-pole main line slot is formed by dividing the three phase-to-phase dividing ribs, the phase-to-phase dividing rib between the neutral line slot and the adjacent live line slot is the first phase-to-phase dividing rib; the live line slot includes a disconnecting area, and there is an interlaced structure between the first phase-to-phase dividing rib and the second cover body, and the interlaced structure is located near the disconnecting area.

[0014] In some embodiments of the present application, a groove is provided on the first interphase dividing rib, and a protrusion is provided on the second cover, and the protrusion extends into the groove to form the staggered structure.

[0015] In some embodiments of the present application, the neutral line slot has a straight-through conductor or a disconnectable conductor component.

[0016] In some embodiments of the present application, one side surface of the second cover body is coplanar with one side surface of the base, and the side surface of the base has a wire groove connected to the back side of the base, and the side surface of the second cover body has a wire opening, which is connected to the wire groove; and a sealing plate is also included, which is detachably fixed to the base and / or the second cover body to close the wire opening and the wire groove.

[0017] The beneficial effects of this application include:

[0018] The circuit breaker provided in this application utilizes a base, a first cover, and a second cover. This allows for a universal first cover (partially compatible materials) and the use of an upper and lower housing mounting structure, facilitating the installation of conductors within the N-pole structure. Furthermore, the first cover is used to press one end of the second cover against the base. This allows the second cover to be securely fastened to the base via a second fastener at its other end to achieve stable assembly of the N-pole structure. This reduces the number of second fasteners and facilitates product assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 A perspective view of a circuit breaker according to embodiment 1 of the present application is shown;

[0021] Figure 2 An exploded view of a circuit breaker according to embodiment 1 of the present application is shown;

[0022] Figure 3 A schematic diagram showing the cooperation between the second cover and the base of the circuit breaker in Example 1 of the present application is shown;

[0023] Figure 4 A schematic diagram showing the cooperation between the second cover and the first cover of the circuit breaker in embodiment 1 of the present application is shown;

[0024] Figure 5 A schematic diagram of the second cover of the circuit breaker in embodiment 1 of the present application is shown;

[0025] Figure 6 A schematic diagram of a circuit breaker base according to embodiment 1 of the present application is shown;

[0026] Figure 7 A schematic diagram of the circuit breaker base and the rotating shaft according to Example 1 of the present application is shown. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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

[0032] like Figure 1-Figure 7 As shown, embodiment 1 of the present application provides a circuit breaker, which includes:

[0033] The base 100 has four main line troughs arranged in sequence along a first direction F1, where the first direction F1 is the width direction. These main line troughs are used to house the main line conductors. Based on the phase of the main line conductors, they are divided into three live line troughs 101 and one neutral line trough 102. The three live line troughs 101 are adjacent to each other, while the neutral line trough 102 is located at the very edge (adjacent to one of the live line troughs 101). Two arrangements for the neutral line trough 102 are available: one to the left of the live line trough 101 (also called the left neutral), and the other to the right of the rear line trough (also called the right neutral).

[0034] The first cover 200 is attached to the base 100 via a first fastener, wherein the first fastener is a bolt. In addition, other fasteners such as rivets may also be used. Since the first cover 200 is located above all the live wire slots 101, the first cover 200 can close the live wire slots 101. For molded case circuit breakers with different shell structures, the first cover 200 is also different. For some molded case circuit breakers whose shells only include a base 100 and a top cover, the top cover is the topmost shell, and in this case, the first cover 200 is the top cover. For some molded case circuit breakers whose shells include a base 100, a middle cover, and a top cover, the top cover is the topmost shell, and the middle cover is the shell located on the base 100. In this case, the first cover 200 is the middle cover. For example, in the structure of this embodiment, the first cover 200 is the middle cover.

[0035] The second cover 300 is disposed on the base 100, above the neutral line slot 102, and is used to close the neutral line slot 102. The second cover 300 is fastened to the base 100 at one end via a second fastener, and is pressed against the base 100 at the other end via the first cover 200. The second fastener is a bolt, but other fasteners, such as rivets, may also be used.

[0036] Here, there are many ways for the second cover 300 to be pressed against the first cover 200. For example, the first cover 200 can be partially inserted into the second cover 300 to press against the second cover 300, or the second cover 300 can be extended into the first cover 200 to press against the first cover 200. In either case, as long as one end of the second cover 300 is pressed against the first cover 200, the number of second fasteners can be reduced.

[0037] As a relatively preferred method, the second cover 300 has a pressing portion 300a that extends below the first cover 200. A relief groove 100a is provided on the base 100, and the pressing portion 300a is located in the relief groove 100a. When pressed, the first cover 200 presses the pressing portion 300a into the relief groove 100a. This design of the relief groove 100a ensures a tight connection between the first cover 200, the second cover 300, and the base 100, and also prevents the problem of a large gap between the first cover 200 and the base 100 caused by only providing the pressing portion 300a.

[0038] The base 100 has four main line ducts separated by three phase-to-phase dividing ribs 103. The phase-to-phase dividing rib 103 located between the neutral duct 102 and the adjacent live duct 101 is the first phase-to-phase dividing rib 103a. The avoidance groove 100a is positioned on the first phase-to-phase dividing rib 103a. This arrangement facilitates assembly of the pressing portion 300a, allowing it to easily extend under the first cover 200 to form abutment.

[0039] A slot 100b is provided on the base 100, and a plug-in portion 300b is provided on the second cover 300, which is inserted into the slot 100b. Such a plug-in structure can facilitate the positioning fit between the base 100 and the second cover 300, and also increase the limit to ensure the stability between the base 100 and the second cover 300.

[0040] There are many locations for setting such a slot 100b. As a more preferred way, the slot 100b is set on the first phase-to-phase dividing rib 103a, which is more conducive to the assembly of the second cover 300 (making the structure between the second cover 300 and the base 100 as concentrated as possible, for example, the assembly of the pressing part 300a and the avoidance groove 100a, and the assembly of the slot 100b and the plug-in part 300b are all at the first phase-to-phase dividing rib 103a).

[0041] The moving contact of the circuit breaker is mounted on a rotating shaft 400. Rotation of the rotating shaft 400 allows the moving contact to connect and disconnect with the stationary contact. The rotating shaft 400 and the method for connecting and disconnecting the moving and stationary contacts by rotation are well known and will not be described in detail here.

[0042] A first rotation groove 100c is defined on the interphase dividing rib 103. This first rotation groove 100c is used to thread and rotate the rotating shaft 400. A second rotation groove 300c is defined on the plug-in portion 300b. The notch direction of the second rotation groove 300c is diametrically opposite to that of the first rotation groove 100c. This allows the plug-in portion 300b to engage with the slot 100b, creating a space within the second rotation groove 300c and the first rotation groove 100c of the first interphase dividing rib 103a. This structure allows the plug-in portion 300b to have more functions, simplifying the product's internal structure.

[0043] The live wire slot 101 is divided along the second direction F2 (the lengthwise direction) into a first wiring area 1011, a disconnecting area 1012, an operating mechanism area 1013, a protection function area 1014, and a second wiring area 1015. The first wiring area 1011 is used to accommodate the first wiring terminals, the disconnecting area 1012 is used to accommodate the moving and static contacts and the arc extinguishing chamber, the operating mechanism area 1013 is used to accommodate the operating mechanism, and the protection function area 1014 is used to accommodate protection devices (such as an electronic molded case for accommodating a transformer and backup protector, an electronic residual current circuit breaker for accommodating a zero-sequence transformer, a transformer, and backup protector, a thermal-magnetic residual current circuit breaker for accommodating a zero-sequence transformer and a thermal-magnetic release, and a thermal-magnetic circuit breaker for accommodating a thermal-magnetic release). The second wiring area 1015 is used to accommodate the second wiring terminals.

[0044] There is a staggered structure between the first phase dividing rib 103a and the second cover 300, which is located near the disconnecting area 1012, that is, on one side of the disconnecting area 1012, so as to increase the creepage distance between the neutral wire slot 102 and the adjacent live wire slot 101.

[0045] There are many forms of such staggered structures, which can be a groove 100d provided on the first interphase dividing rib 103a and a protrusion 300d provided on the second cover 300; or the opposite arrangement. Either way is beneficial to increase the creepage distance.

[0046] As a more preferred embodiment, a groove 100d is provided on the first interphase dividing rib 103a, and a protrusion 300d is provided on the second cover 300, and the protrusion 300d extends into the groove 100d to form the staggered structure.

[0047] There are many forms of the main line conductor in the neutral line slot 102, which can be a straight-through form or a disconnectable form.

[0048] Taking the straight-through form as an example, it can be a soft wire or a hard busbar connected between two wiring structures.

[0049] Taking the disconnectable type as an example, it adopts the same form as that in the live wire slot 101, that is, a disconnectable conductor component including moving and static contacts.

[0050] The above structures can be applied to conventional molded case circuit breakers, and can also be applied to some circuit breakers containing control circuit boards.

[0051] For some circuit breakers with control circuit boards, sampling requires taking samples from the back of the circuit breaker. To facilitate routing of the sampling line, a wire trough 100e is provided on one side of the base 100, connecting to the back of the base 100. A wire opening 300e is also provided on one side of the second cover 300. This side of the base 100 is coplanar with the side of the second cover 300. Since the wire opening 300e is connected to the wire trough 100e, the sampling line can pass through it.

[0052] The sealing plate 500 is detachably fixed to the base 100 and the second cover 300, and the detachable fixation here is plug-in fit. A plug-in slot is provided on the base 100, and the opening of the plug-in slot is located on the back of the base 100. The sealing plate 500 is plugged into the slot 100b to close the wire opening 300e and the wire trough 100e. Of course, there are many ways of detachable fit, such as directly fastening with screws, or using a snap fit, or rotating connection, or plugging in other directions. No matter which method is used, as long as a sealing plate 500 can be achieved to open and close the wire opening 300e and the wire trough 100e, it will be sufficient.

[0053] 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.

[0054] 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 having four main line slots arranged in sequence along a first direction, wherein the main line slot at the outermost edge is a neutral line slot, and the remaining three main line slots are live line slots; characterized in that: It also includes a first cover and a second cover. The first cover is located above all the live wire slots and is used to close the live wire slots. The second cover is located above the neutral wire slot and is used to close the neutral wire slots. The first cover is fixed to the base by a first fastener, and the end of the second cover away from the first cover is fixed to the base by a second fastener. At least a portion of the end of the second cover close to the first cover is pressed against the base by the first cover.

2. A circuit breaker according to claim 1, characterized in that: The portion of the second cover body pressed by the first cover body includes a pressing portion extending below the first cover body. An escape groove is provided on the base, and the first cover body is pressed into the escape groove by the pressing portion.

3. A circuit breaker according to claim 2, characterized in that: The base includes three phase-to-phase dividing ribs, and the four-pole main line trough is formed by dividing the three phase-to-phase dividing ribs; the phase-to-phase dividing rib between the neutral line trough and the adjacent live line trough is the first phase-to-phase dividing rib, and the avoidance groove is opened on the first phase-to-phase dividing rib.

4. A circuit breaker according to claim 1, characterized in that: A slot is provided on the base, and a plug-in portion is provided on the second cover, and the plug-in portion is inserted into the slot.

5. A circuit breaker according to claim 4, characterized in that: The base includes three phase-to-phase dividing ribs, and the four-pole main line slots are formed by dividing the three phase-to-phase dividing ribs; the phase-to-phase dividing rib between the neutral line slot and the adjacent live line slot is the first phase-to-phase dividing rib, and the slot is opened on the first phase-to-phase dividing rib.

6. A circuit breaker according to claim 5, characterized in that: All phase-to-phase dividing ribs are provided with a first rotation groove; the circuit breaker includes a rotating shaft, which is arranged to rotate with the first rotation groove; a second rotation groove is provided on the plug-in portion, and the notch direction of the second rotation groove is opposite to the notch direction of the first rotation groove; a portion of the rotating shaft is located in a space jointly formed by the second rotation groove and the first rotation groove of the first phase-to-phase dividing rib.

7. The circuit breaker according to claim 1, characterized in that: The base includes three phase-to-phase dividing ribs, and the four-pole main line trough is formed by dividing the three phase-to-phase dividing ribs. The phase-to-phase dividing rib between the neutral line trough and the adjacent live line trough is the first phase-to-phase dividing rib; the live line trough includes a disconnecting area, and there is an interlaced structure between the first phase-to-phase dividing rib and the second cover body, and the interlaced structure is located near the disconnecting area.

8. A circuit breaker according to claim 7, characterized in that: The first phase separation ribs are provided with grooves, and the second cover body is provided with protrusions, which extend into the grooves to form the staggered structure.

9. A circuit breaker according to any one of claims 1 to 8, characterized in that: The neutral line slot has a straight-through conductor or a disconnectable conductor component.

10. A circuit breaker according to any one of claims 1 to 8, characterized in that: One side surface of the second cover body is coplanar with one side surface of the base, and a wire groove connected to the back side of the base is provided on the side surface of the base. A wire opening is provided on the side surface of the second cover body, and the wire opening is connected to the wire groove; a sealing plate is also included, which is detachably fixed to the base and / or the second cover body to close the wire opening and the wire groove.

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