Circuit breaker

Abstract

The invention discloses a circuit breaker which comprises at least one circuit breaker unit group, each circuit breaker unit group comprises two circuit breaker units, and each circuit breaker unit comprises a circuit breaker shell. Wherein the circuit breaker shell comprises a first short circuit cavity, an instantaneous release cavity and an arc extinguishing cavity; in the first direction, the first short-circuit cavity is located on the first side of the instantaneous release cavity. In the second direction, the first short-circuit cavity and the instantaneous release cavity are jointly positioned above the arc extinguishing cavity; a short-circuit structure is arranged in the first short-circuit cavity, and the short-circuit structure enables the two circuit breaker units in the same circuit breaker unit group to form a series connection relation in circuit relation; the first direction is perpendicular to the second direction; the storage box has the characteristic that the internal space is more reasonable.

Description

Technical Field

[0001] The present application relates to the electrical field, and more particularly to a circuit breaker. Background Art

[0002] In the field of miniature circuit breakers, for use in DC scenarios, two-pole circuit breakers are often short-circuited to improve the breaking capacity of the circuit breaker. The specific short-circuiting method, as shown in CN221529842U, is that each circuit breaker unit has left and right terminals. The terminals on one side are short-circuited by a shorting bar, ultimately forming a series relationship between the two-pole circuit breaker units.

[0003] However, the design of the internal layout of the circuit breaker unit is based on the application in the AC scenario, so the space design of the arc extinguishing chamber does not take into account the reference of the DC scenario. Because AC power will pass through the zero point, it is easier to extinguish than DC power, so the arc extinguishing chamber does not need to be designed to be particularly large, so the internal space does not need to be designed to be particularly large. The specific internal space design is shown in this patent and Figure 7 As shown, the internal chambers are sequentially divided into the first terminal chamber 1, the second terminal chamber 2, the instantaneous release chamber 3, the arc extinguishing chamber 4, the operating mechanism main chamber 5, the disconnecting region chamber 6, and the overload release chamber 7. Specifically, in terms of the lengthwise arrangement, the first terminal chamber 1 is located to the left of the instantaneous release chamber 3 and the arc extinguishing chamber 4 (the instantaneous release chamber 3 and the arc extinguishing chamber 4 are arranged side by side in the height direction, and the first terminal chamber 1 spans these two chambers). To the right of the instantaneous release chamber 3 and the arc extinguishing chamber 4 are the operating mechanism main chamber 5 and the disconnecting region chamber 6 (the operating mechanism main chamber 5 and the disconnecting region chamber 6 are arranged side by side in the height direction). The overload release chamber 7 is located to the right of these two chambers, and the second terminal chamber 2 is to the right of the overload release chamber 7.

[0004] With this structure, the overall space of the arc extinguishing chamber is limited. No matter how the shape of the arc extinguishing chamber is optimized, its performance is limited due to space limitations. With the demand for higher voltage DC, it is difficult to meet the requirements.

[0005] Therefore, how to minimize the changes to the internal structure of the circuit breaker (so that it can match too many other common components) while increasing the size of the arc extinguishing chamber (reserving more space for the design of the arc extinguishing chamber) is obviously 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 at least one circuit breaker unit group, each circuit breaker unit group comprising two circuit breaker units, and each circuit breaker unit comprising a circuit breaker housing; wherein the circuit breaker housing comprises a first short-circuit chamber, an instantaneous trip chamber, and an arc extinguishing chamber; in a first direction, the first short-circuit chamber is located on a first side of the instantaneous trip chamber; in a second direction, the first short-circuit chamber and the instantaneous trip chamber are located together above the arc extinguishing chamber; a short-circuit structure is provided in the first short-circuit chamber, which forms a series circuit relationship between two circuit breaker units in the same circuit breaker unit group; the first direction and the second direction are perpendicular to each other.

[0008] In some embodiments of the present application, a main line conductor is provided inside each circuit breaker unit, and the main line conductor includes a first conductive member located in a first short-circuit cavity; the short-circuit structure includes a first conductive short-circuit plate spanning the two first short-circuit cavities and a first screw corresponding to the first conductive member, and the first screw passes through the first conductive short-circuit plate and is threadedly connected to the corresponding first conductive member, so that the two circuit breaker units form a series relationship.

[0009] In some embodiments of the present application, a main line conductor is provided inside each circuit breaker unit, and the main line conductor includes a first conductive member located in a first short-circuit cavity; the short-circuit structure includes a first conductive short-circuit plate spanning the two first short-circuit cavities and a first screw and a nut corresponding to the first conductive member, and the first screw passes through the first conductive short-circuit plate, the corresponding first conductive member and the corresponding nut to be connected, so that the two circuit breaker units form a series relationship.

[0010] In some embodiments of the present application, a solenoid-type electromagnetic release is provided in the instantaneous release cavity, the coil of the solenoid-type electromagnetic release is a component of the main line conductor, the first conductive member and the coil are integrally formed components, or the first conductive member and the coil are welded or riveted.

[0011] In some embodiments of the present application, a snap-on electromagnetic release is provided in the instantaneous release cavity, and the main line conductor includes a conductive bar inserted into the snap-on electromagnetic release, and the conductive bar and the first conductive member are the same component, or the conductive bar and the first conductive member are welded or riveted.

[0012] In some embodiments of the present application, the circuit breaker housing includes a first side wall, which is at least partially a side wall of the first short-circuit cavity in the first direction. The first side wall is provided with an insertion hole for installing the first conductive short-circuit plate, and further includes a first closing member removably connected to the circuit breaker housing.

[0013] In some embodiments of the present application, the circuit breaker housing includes a third side wall, which is at least partially the side wall of the first short-circuit cavity in the second direction. A tool hole is provided on the third side wall, which corresponds to the first screw. The third side wall also includes a second closing member that is removably connected to the circuit breaker housing.

[0014] In some embodiments of the present application, the short-circuit structure includes a first conductive short-circuit plate spanning two first short-circuit cavities and a first screw and a nut corresponding to the first conductive member. The first screw passes through the first conductive short-circuit plate, the corresponding first conductive member and is connected to the corresponding nut, so that the two circuit breaker units form a series relationship; the first short-circuit cavity has a nut groove, and the nut is arranged in the nut groove, and the nut groove limits the nut in the rotation direction of the first screw.

[0015] In some embodiments of the present application, a size of the first short-circuit chamber in the second direction is smaller than a size of the arc-extinguishing chamber in the second direction.

[0016] In some embodiments of the present application, the circuit breaker housing has a first upper side wall located between the arc extinguishing chamber and the first short-circuit chamber, and a second upper side wall located between the arc extinguishing chamber and the instantaneous release chamber; the first upper side wall is connected to the second upper side wall, and in the second direction, the first upper side wall is lower than the second upper side wall and the distance between the two is not greater than 5 mm.

[0017] In some embodiments of the present application, the arc extinguishing chamber includes a first arc extinguishing area and a second arc extinguishing area. The first arc extinguishing area is used to set up the arc extinguishing chamber, and the second arc extinguishing area is provided with an exhaust duct. The second arc extinguishing area is located on one side of the first arc extinguishing area in the first direction.

[0018] In some embodiments of the present application, the arc extinguishing chamber includes a first arc extinguishing area and a second arc extinguishing area. The first arc extinguishing area is used to set up the arc extinguishing chamber, and the second arc extinguishing area is provided with an exhaust duct. In the second direction, the second arc extinguishing area is located below the first short-circuit chamber, and the first arc extinguishing area is located below the instantaneous release chamber.

[0019] In some embodiments of the present application, the circuit breaker housing includes a first side wall, which is at least partially a side wall of the second arc extinguishing area in the first direction, and an exhaust hole connecting the exhaust duct and the outside is opened on the first side wall.

[0020] In some embodiments of the present application, the circuit breaker housing includes a bottom wall, at least a portion of which is a side wall of the first arc extinguishing area in the second direction, and an exhaust hole connecting the exhaust duct and the outside is opened on the bottom wall.

[0021] In some embodiments of the present application, the circuit breaker housing further includes an operating mechanism main cavity, a disconnecting area cavity, an overload release cavity, and a first terminal cavity; in the second direction, the operating mechanism main cavity is located above the disconnecting area cavity; in the first direction, the operating mechanism main cavity is located on the second side of the instantaneous release cavity, the disconnecting area cavity is located on the second side of the arc extinguishing chamber, the overload release cavity is located on the second side of the operating mechanism main cavity and the disconnecting area cavity, and the first terminal cavity is located on the second side of the overload release cavity.

[0022] Compared with the prior art, this application has the following advantages: This design overcomes the existing technical bias (the original layout was designed for AC scenarios, resulting in a very small arc-extinguishing chamber that could not be further enlarged, as this would increase the overall size of the circuit breaker). The terminal chamber, originally located on the common side of the arc-extinguishing chamber and the electromagnetic release chamber, has been redesigned to form a first shorting chamber. This first shorting chamber is located on the first side of the instantaneous release chamber (in the first direction), and the first shorting chamber and the instantaneous release chamber are located above the arc-extinguishing chamber (in the second direction). This housing structure arrangement, applied in DC scenarios, increases the volume of the arc-extinguishing chamber (without increasing the size of the circuit breaker housing, the arc-extinguishing chamber volume is larger than that of the internal layout of the AC structure), providing a possibility for the configuration of more complex arc-extinguishing chamber structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 An axial view of a circuit breaker according to an embodiment of the present application is shown; Figure 2 A schematic diagram of the internal space layout of a circuit breaker unit according to an embodiment of the present application is shown; Figure 3 A structural diagram showing the internal space of a circuit breaker unit according to an embodiment of the present application is shown; Figure 4 A schematic diagram showing the interior of a circuit breaker unit according to an embodiment of the present application is shown; Figure 5 A schematic diagram showing a short-circuit structure of a circuit breaker unit according to an embodiment of the present application is shown; Figure 6 A partial enlarged view of a circuit breaker unit according to an embodiment of the present application is shown; Figure 7 A schematic diagram of the internal space layout of a circuit breaker unit in the prior art is shown. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] Furthermore, the terms "first" and "second" 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 being referred to. Therefore, features specified as "first" or "second" 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.

[0028] In this application, unless otherwise specified or limited, terms such as "mounted," "connected," "electrically connected," and "fixed" should be interpreted broadly. For example, they may refer to fixed electrical connections, removable electrical connections, or integrated connections; they may refer to mechanical electrical connections or electrical electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; they may refer to internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0029] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature. Example

[0030] like Figures 1-6 As shown, an embodiment of the present application is a circuit breaker including a group of circuit breaker units P, each group of circuit breaker units P including two circuit breaker units P. Of course, two groups of circuit breaker units can also be arranged side by side. Here, as long as the number of circuit breaker unit groups P is arbitrary, each group of circuit breaker units P includes two circuit breaker units P.

[0031] Here, each circuit breaker unit P has the same structure. The circuit breaker units P in the same circuit breaker unit group P are arranged sequentially along the width direction D and are fastened with rivets or snap fastening. When there are two or more circuit breaker unit groups P, all circuit breaker units P can also be fastened with rivets.

[0032] Since the internal structure of each circuit breaker unit P is the same, one of the circuit breaker units P is used for description.

[0033] The circuit breaker unit P includes a circuit breaker housing 100. The circuit breaker housing 100 is formed of two halves: a left half and a right half. The two halves are joined together in the width direction D and secured with rivets (the rivets can penetrate the circuit breaker housing 100 of all circuit breaker units). Two circuit breaker units P in the same group can share a common intermediate housing. This means that the two circuit breaker units P in the same group have a total of three halves, effectively forming a single, integrated structure from the adjacent halves of the two circuit breakers.

[0034] Regardless of the form of the circuit breaker housing 100, each circuit breaker unit P includes a first short-circuit chamber S10, an instantaneous release chamber S20, an arc extinguishing chamber S30, an operating mechanism main chamber S40, a disconnecting area chamber S50, an overload release chamber S60, a first terminal chamber S70 and a common chamber S80.

[0035] Here, in the second direction (also known as the height direction H), the first short-circuit chamber S10 and the instantaneous release chamber S20 are jointly located above the arc extinguishing chamber S30, the operating mechanism main chamber S40 is located above the disconnecting area chamber S50, and the common chamber S80 is located above the instantaneous release chamber S20.

[0036] In the first direction (also known as the length direction), the first short-circuit chamber S10 is located on the first side of the instantaneous release chamber S20, the operating mechanism main chamber S40 is located on the common second side of the instantaneous release chamber S20 and the common chamber S80, the disconnecting area chamber S50 is located on the second side of the arc extinguishing chamber S30, the overload release chamber S60 is located on the common second side of the disconnecting area chamber S50 and the operating mechanism main chamber S40, and the first terminal chamber S70 is located on the second side of the overload release chamber S60.

[0037] Here, the first direction and the second direction are perpendicular to each other, and the first side and the second side are opposite sides.

[0038] The first shorting chamber S10 is used to accommodate a shorting structure that shorts the main line conductors of two circuit breaker units P, placing the two circuit breaker units P in series. In other words, the first shorting chamber S10 is used to connect the circuit breaker units P to each other (not directly to external circuits).

[0039] The arc extinguishing chamber S30 is used to accommodate the arc extinguishing chamber 30 and the exhaust structure behind the arc extinguishing chamber 30 .

[0040] The breaking area cavity S50 is the movement area where the moving and static contacts separate and contact.

[0041] The instantaneous release chamber S20 is used to accommodate the instantaneous release and part of the main line conductor.

[0042] The operating mechanism main cavity S40 is used to accommodate most of the operating mechanism, such as part of the connecting rod, the lock, the contact support, part of the moving contact, etc.

[0043] The common cavity S80 is used to accommodate the handle of the operating mechanism and another portion of the connecting rod. In short, the common cavity S80 and the main cavity S40 of the operating mechanism together accommodate the operating mechanism. The operating mechanism here refers to a four-bar linkage operating mechanism, which includes both operating mechanisms with and without tripping buckles. Both mechanisms are well known in the art and will not be described in detail here.

[0044] The overload release cavity S60 is used to accommodate a bimetallic strip. The specific working principle is common knowledge and will not be described in detail here.

[0045] The first terminal cavity S70 is used to accommodate first terminals 70. First terminals 70 can be screw-type or cage-type (elastic sheet) terminals. Either type of terminal is acceptable as long as it can connect to external circuits. In other words, the terminals within the first terminal cavity S70 are used to connect to external circuits, placing the circuit breaker in an external connection configuration for the circuits it protects.

[0046] Such a structure overcomes the prejudice of the existing technology and changes the existing internal layout based on the AC environment (the traditional internal layout based on the AC environment is that one group of terminal cavities occupies a large space and is arranged on the common first side of the arc extinguishing chamber S30 and the electromagnetic release chamber in the first direction) to a first short-circuit chamber S10 and an instantaneous release chamber S20 located together above the arc extinguishing chamber S30 (in the second direction). Such a structure is equivalent to reducing the space of the original terminal cavity and moving it to the arc extinguishing chamber S30. Without increasing the volume of the existing circuit breaker, the volume of the arc extinguishing chamber S30 is increased. When applied in a DC scenario, it will provide a possibility for accommodating an arc extinguishing chamber 30 with a more complex structure.

[0047] Here, the circuit breaker unit P is equipped with a main line conductor. This main line conductor is distributed across various chambers, including the movable contact, the stationary contact, and the conductive plate within the first terminal block 70. The portion of the main line conductor within the first shorting chamber S10 is the first conductive member 13. The remaining components will be described later.

[0048] The shorting structure includes a first conductive shorting plate 10, a first screw 11, and a nut 12, spanning two first shorting cavities S10 (for the two circuit breaker units P in the same circuit breaker unit group P). Each circuit breaker has a main line conductor, so there are two first conductive members 13, and the number of first screws 11 and nuts 12 corresponds one-to-one to the number of first conductive members 13. Both the first conductive members 13 and the first conductive shorting plate 10 have through-holes. The first screw 11 passes through the two through-holes and is fastened to the corresponding nut 12. This connects the main line conductors of the two circuit breaker units P through the first conductive shorting plate 10, forming a series connection in the circuit.

[0049] The use of this nut 12 saves more space than the terminal blocks in the prior art (because no wiring frame is required, which takes up too much space), and is more suitable for the smaller first short-circuit chamber S10 structure, that is, it is more suitable for the layout in which the first short-circuit chamber S10 and the instantaneous release chamber S20 are located together above the arc extinguishing chamber S30.

[0050] Of course, the nut 12 here can also be cancelled. It is only necessary to change the through hole on the first conductive part 13 into a threaded hole, that is, the first screw 11 and the first conductive part 13 form a threaded connection, which can also achieve the above effect and is suitable for the smaller first short-circuit cavity S10 structure.

[0051] Here, the first short-circuit cavity S10 has a nut groove 14, and the nut 12 is disposed in the nut groove 14. The nut groove 14 limits the nut 12 in the rotation direction of the first screw 11. The nut 12 here can be either an insert nut 12 or a common nut 12.

[0052] The first conductive member 13 has different configurations depending on the type of electromagnetic release. For example, a solenoid-type electromagnetic release comprises a coil 20 (which also forms part of the main circuit conductor), a sliding movable iron core, a stationary iron core, a push rod, and other components. One end of the first conductive member 13 is welded to the coil 20. Of course, the first conductive member 13 here has a bent structure that mates with the retaining groove in the housing, ensuring stable installation.

[0053] Of course, in addition to this, in the case of this solenoid type electromagnetic release, the first conductive member 13 can also be fixed to the coil 20 by riveting, or the first conductive member 13 and the coil 20 can be an integrally formed component.

[0054] This solenoid type electromagnetic release has a relatively stable structure and is a more preferred electromagnetic release.

[0055] The second type of electromagnetic release uses a flap-type electromagnetic release. This flap-type electromagnetic release includes a moving iron core, a stationary iron core, and a conductive bar. The moving iron core is rotated relative to the stationary iron core, and the conductive bar extends through the space surrounded by the moving and stationary iron cores. In this case, the conductive bar and the first conductive member 13 are the same component. In other words, the first conductive member 13 corresponds to the end of the conductive bar that extends into the first shorting cavity S10.

[0056] Of course, in this manner, the conductive bar and the first conductive member 13 may also be fixed by welding or by riveting.

[0057] This snap-on electromagnetic release has fewer components and lower cost.

[0058] Here, the circuit breaker housing 100 includes a first sidewall 101. Here, the first sidewall 101 at least partially forms the sidewall of the first short-circuit chamber S10 in the first direction. Alternatively, the first sidewall 101 serves as a common sidewall for the first short-circuit chamber S10 and the arc-extinguishing chamber S30. A plug-in hole 102 is defined in the first sidewall 101. The plug-in hole 102 communicates with the first short-circuit chamber S10 and is used to insert the first conductive short-circuit plate 10 into the first short-circuit chamber S10. A first closure member 103 is also provided. The first closure member 103 is connected to the circuit breaker housing 100 (near the first sidewall 101) via a snap-fit ​​connection, enabling the first closure member 103 to seal the plug-in hole 102.

[0059] Such a design of the plugging hole 102 and the first closing member 103 will improve the installation of the first conductive shorting plate 10 and the integrity after installation.

[0060] Here, the circuit breaker housing 100 includes a third sidewall 104, which at least partially forms a sidewall of the first short-circuit cavity S10 in the second direction. A tool hole 105 is defined in the third sidewall 104. Tool hole 105 corresponds to the first screw 11, allowing a screwdriver to enter through tool hole 105 for tightening. To seal tool hole 105, a second closure member 106 is also included. This second closure member 106 is connected to the circuit breaker housing 100 (near the third sidewall 104) via a snap-fit ​​connection, enabling the second closure member 106 to seal tool hole 105.

[0061] Here, the dimension of the first short-circuit chamber S10 in the second direction is smaller than the dimension of the arc-extinguishing chamber S30 in the second direction. In other words, the height dimension of the first short-circuit chamber S10 is smaller than the height dimension of the arc-extinguishing chamber S30. This dimension design makes the space of the first short-circuit chamber S10 more compact, leaving as much space as possible for the arc-extinguishing chamber S30.

[0062] The circuit breaker housing 100 has side walls separating the first short-circuit chamber S10, the instantaneous release chamber S20, and the arc-extinguishing chamber S30. Here, the side wall separating (or located between) the first short-circuit chamber S10 and the arc-extinguishing chamber S30 is the first upper side wall 231, and the side wall separating (or located between) the arc-extinguishing chamber S30 and the instantaneous release chamber S20 is the second upper side wall 232. The first upper side wall 231 and the second upper side wall 232 are offset in the height direction H. In other words, the first upper side wall 231 is lower than the second upper side wall 232 in the second direction. However, the distance d between the first upper side wall 231 and the second upper side wall 232 is no greater than 5 mm, and in this embodiment, is 3 mm. This offset arrangement is intended to keep the space in the first short-circuit chamber S10 within a reasonable range, leaving more space for the arc-extinguishing chamber S30.

[0063] The arc-extinguishing chamber S30 comprises a first arc-extinguishing area S310 and a second arc-extinguishing area S320. The first arc-extinguishing area S310 houses the arc-extinguishing chamber 30, while the second arc-extinguishing area S320 is provided with an exhaust duct 31. The second arc-extinguishing area S320 is located to one side of the first arc-extinguishing area S310 in the first direction. This structure allows the exhaust duct 31 to exhaust the gas behind the arc-extinguishing chamber 30.

[0064] Here, in the second direction, the second arc extinguishing region S320 is located below the first short circuit cavity S10 , and the first arc extinguishing region S310 is located below the instantaneous release cavity S20 .

[0065] The first sidewall 101 has an exhaust hole 32 formed in the portion corresponding to the second arc extinguishing region S320. The exhaust hole 32 is connected to the exhaust duct 31, allowing gas to be discharged into the air through the exhaust duct 31 and the exhaust hole 32. The exhaust hole 32 can be oriented obliquely, for example, downward or upward, and the direction of the exhaust duct 31 can also match that of the exhaust hole 32.

[0066] As another alternative, the exhaust hole 32 may also be provided below the first arc extinguishing region S310. That is, the circuit breaker housing 100 includes a bottom wall 33, which at least partially forms a side wall of the first arc extinguishing region S310 in the second direction. The exhaust hole 32 is provided on the bottom wall 33, allowing the exhaust duct 31 to communicate with the outside.

[0067] 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.

[0068] 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 at least one circuit breaker unit group, each circuit breaker unit group comprising two circuit breaker units, each circuit breaker unit comprising a circuit breaker housing; characterized in that: The circuit breaker housing includes a first short-circuit chamber, an instantaneous trip chamber, and an arc extinguishing chamber; in a first direction, the first short-circuit chamber is located on a first side of the instantaneous trip chamber; In the second direction, the first short-circuit chamber and the instantaneous trip chamber are located together above the arc extinguishing chamber; a short-circuit structure is provided in the first short-circuit chamber, which forms a series relationship between the two circuit breaker units in the same circuit breaker unit group in terms of circuit relationship; the first direction and the second direction are perpendicular to each other.

2. A circuit breaker according to claim 1, characterized in that: Each circuit breaker unit is provided with a main line conductor, which includes a first conductive member located in a first short-circuit cavity. The short-circuit structure includes a first conductive short-circuit plate spanning the two first short-circuit cavities and a first screw corresponding to the first conductive member. The first screw passes through the first conductive short-circuit plate and is threadedly connected to the corresponding first conductive member, so that the two circuit breaker units are connected in series. Alternatively, a main line conductor is provided inside each circuit breaker unit, and the main line conductor includes a first conductive member located in a first short-circuit cavity; the short-circuit structure includes a first conductive short-circuit plate spanning the two first short-circuit cavities and a first screw and a nut corresponding to the first conductive member, and the first screw passes through the first conductive short-circuit plate, the corresponding first conductive member and the corresponding nut to connect the two circuit breaker units to form a series relationship.

3. A circuit breaker according to claim 2, characterized in that: A solenoid type electromagnetic release is provided in the instantaneous release cavity, the coil of the solenoid type electromagnetic release is a component of the main line conductor, the first conductive member and the coil are integrally formed components, or the first conductive member and the coil are fixed by welding or riveting; Alternatively, a snap-on electromagnetic release is provided in the instantaneous release cavity, the main line conductor includes a conductive bar inserted into the snap-on electromagnetic release, the conductive bar and the first conductive member are the same component, or the conductive bar and the first conductive member are welded or riveted.

4. A circuit breaker according to claim 2, characterized in that: The circuit breaker housing includes a first side wall, the first side wall at least partially forming a side wall of the first shorting cavity in the first direction, the first side wall defining an insertion hole for mounting the first conductive shorting plate, and a first closure member removably connected to the circuit breaker housing, the first closure member shielding the insertion hole; And / or, the circuit breaker housing includes a third side wall, which is at least partially the side wall of the first short-circuit cavity in the second direction, and a tool hole is provided on the third side wall, which corresponds to the first screw, and also includes a second closing member removably connected to the circuit breaker housing, and the second closing member covers the tool hole.

5. The circuit breaker according to claim 1, characterized in that: The short-circuit structure includes a first conductive short-circuit plate spanning the two first short-circuit cavities and a first screw and a nut corresponding to the first conductive member. The first screw passes through the first conductive short-circuit plate, the corresponding first conductive member and is connected to the corresponding nut, so that the two circuit breaker units form a series relationship; a nut groove is provided in the first short-circuit cavity, and the nut is arranged in the nut groove. The nut groove limits the nut in the rotation direction of the first screw.

6. The circuit breaker according to claim 1, characterized in that: A size of the first short-circuit chamber in the second direction is smaller than a size of the arc-extinguishing chamber in the second direction.

7. The circuit breaker according to claim 1, characterized in that: The circuit breaker housing has a first upper side wall located between the arc extinguishing chamber and the first short-circuit chamber, and a second upper side wall located between the arc extinguishing chamber and the instantaneous release chamber; the first upper side wall is connected to the second upper side wall, and in the second direction, the first upper side wall is lower than the second upper side wall and the distance between the two is not greater than 5 mm.

8. The circuit breaker according to claim 1, characterized in that: The arc extinguishing chamber includes a first arc extinguishing area and a second arc extinguishing area, the first arc extinguishing area is used to set the arc extinguishing chamber, the second arc extinguishing area is provided with an exhaust duct, and the second arc extinguishing area is located on one side of the first arc extinguishing area in the first direction; And / or, the arc extinguishing chamber includes a first arc extinguishing area and a second arc extinguishing area, the first arc extinguishing area is used to set up the arc extinguishing chamber, the second arc extinguishing area is provided with an exhaust duct, the second arc extinguishing area is located below the first short-circuit chamber in the second direction, and the first arc extinguishing area is located below the instantaneous release chamber.

9. A circuit breaker according to claim 8, characterized in that: The circuit breaker housing includes a first side wall, at least a portion of the first side wall being a side wall of the second arc extinguishing area in the first direction, and an exhaust hole connecting the exhaust duct and the outside is opened on the first side wall; And / or, the circuit breaker housing includes a bottom wall, at least a portion of the bottom wall is a side wall of the first arc extinguishing area in the second direction, and an exhaust hole connecting the exhaust duct and the outside is opened on the bottom wall.

10. The circuit breaker according to claim 1, characterized in that: The circuit breaker housing also includes an operating mechanism main cavity, a disconnecting area cavity, an overload release cavity and a first terminal cavity; in the second direction, the operating mechanism main cavity is located above the disconnecting area cavity; in the first direction, the operating mechanism main cavity is located on the second side of the instantaneous release cavity, the disconnecting area cavity is located on the second side of the arc extinguishing chamber, the overload release cavity is located on the second side of the operating mechanism main cavity and the disconnecting area cavity, and the first terminal cavity is located on the second side of the overload release cavity.

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