Miniature residual-current circuit breaker

Abstract

The invention discloses a small residual-current circuit breaker. The small residual-current circuit breaker comprises a control unit and at least two-pole circuit breaker units, the circuit breaker units are sequentially assembled in the first direction, and the control unit is assembled beside one pole of the circuit breaker unit. The control module comprises a control housing and a circuit board assembly arranged in the control housing; wherein the circuit breaker unit comprises circuit breaker shells, and a part of each circuit breaker shell is communicated in a first direction to form an accommodating space; the circuit breaker further comprises an electric leakage mutual inductor, the electric leakage mutual inductor is located in the containing space, a center hole of the electric leakage mutual inductor is at least located in the two adjacent circuit breaker shells, and the electric leakage mutual inductor is electrically connected with the circuit board assembly. A first assembly structure is arranged in the accommodating space, a second assembly structure is arranged on the mutual inductor, and the first assembly structure and the second assembly structure are fixed in a clamping manner, so that the electric leakage mutual inductor and the circuit breaker shell are fixed together; the electric leakage mutual inductor mounting structure has the advantage of being stable in electric leakage mutual inductor mounting and structure.

Description

Technical Field

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

[0002] There are many types of small leakage circuit breakers. According to the driving method, they can be divided into intelligent small leakage circuit breakers (including electric operation) and non-intelligent small leakage circuit breakers (excluding electric operation structure).

[0003] Regardless of the method, currently small leakage circuit breakers are mainly divided into three forms according to the different placement forms of the leakage transformer.

[0004] In the first form, taking CN113012993A as an example, the leakage transformer is a separate module, which is assembled with the automatic reclosing device (also known as the control unit) and the circuit breaker unit. This method also has a problem, which makes the structure of the main line conductor very complicated. This is because since it is necessary to ensure that the leakage transformer and the circuit breaker unit are two independent modules, and the leakage transformer needs the main line conductor to pass through, it is necessary to set the main line conductor inside the leakage transformer and the circuit breaker unit, and the conductors need to be connected one by one.

[0005] The second form, taking CN220526839U as an example, the leakage transformer is installed inside the control unit. In this case, the selection volume of the leakage transformer is very limited (only smaller models can be selected), the accuracy is also very limited, and it will also occupy the internal space of the control unit. If it is just a non-intelligent small leakage circuit breaker, it is okay, but if it is an intelligent type (because the intelligent type has many functions, it requires a large number of electronic components to implement), then it will be very difficult to implement.

[0006] The third form, taking CN114171352A as an example, the leakage transformer crosses the space of all circuit breakers. Although this form can solve the problems brought by the above two methods, for the leakage transformer, it lacks some limit in the space of the circuit breaker, which easily causes the leakage transformer to shake, making it more difficult to achieve automation.

[0007] Therefore, it is very necessary to improve the installation structure of the leakage transformer to ensure that the installation of the leakage transformer is more stable. Summary of the invention

[0008] In view of this, the purpose of the present application is to overcome the deficiencies in the prior art and to provide a reclosing circuit breaker.

[0009] The present application provides: a small leakage circuit breaker, which includes a control unit and at least two-pole circuit breaker units; each circuit breaker unit is assembled in sequence along a first direction, and the control unit is assembled next to one of the pole circuit breaker units; the control module includes a control cover and a circuit board assembly arranged inside the control cover; wherein the circuit breaker unit includes a circuit breaker housing, and a part of each circuit breaker housing is connected in the first direction to form a accommodating space; it also includes a leakage transformer, the leakage transformer is in the accommodating space, the center hole of the leakage transformer is located in at least two adjacent circuit breaker housings, and the leakage transformer is electrically connected to the circuit board assembly; a first assembly structure is arranged in the accommodating space, and a second assembly structure is arranged on the transformer, and the first assembly structure is fixed by clamping to realize that the leakage transformer is fixed to the circuit breaker housing.

[0010] In some embodiments of the present application, in the first direction, the end of the leakage transformer close to the control module is the first end, and the end away from the control module is the second end; the second assembly structure is arranged in the area between the axis line of the center hole of the leakage transformer and the second end, or the second assembly structure is arranged on the second end.

[0011] In some embodiments of the present application, the first assembly structure includes a clamping portion and two groups of limiting portions; the second assembly structure and the clamping portion are clamped and fixed; part of the leakage transformer is located in the space formed by the two groups of limiting portions, the two groups of limiting portions limit the leakage transformer at least in the second direction, and the clamping point between the second assembly structure and the clamping portion is located between the two groups of limiting portions.

[0012] In some embodiments of the present application, the first assembly structure includes an abutting portion and a clamping portion; the second end of the leakage transformer is arc-shaped, and the abutting portion abuts against the second end; the second assembly structure and the clamping portion form a clamping fit, or the second assembly structure and the clamping portion and the abutting portion jointly form a clamping fixation.

[0013] In some embodiments of the present application, at least one section of the outer shape of the leakage transformer is an arc-shaped structure, and the second end is a part of the arc-shaped structure; the second assembly structure is a lug arranged on the arc-shaped structure, and the lug and the arc-shaped structure together form a slot; the first assembly structure includes a hook adapted to the slot, and the hook and the slot form a snap-fit ​​fit.

[0014] In some embodiments of the present application, in a first direction, an end of the leakage transformer close to the control module is a first end, and a first connector is disposed on the first end; a second connector is disposed on the circuit board assembly, and the first connector and the second connector are plugged into each other to form an electrical connection between the leakage transformer and the circuit board assembly.

[0015] In some embodiments of the present application, the circuit breaker unit adjacent to the control unit is a head-end circuit breaker unit, and a first through hole is provided on the surface of the circuit breaker housing of the head-end circuit breaker unit adjacent to the control unit, and the first through hole is connected to the accommodating space; after the leakage transformer is pushed in through the first through hole, the second assembly structure is snap-connected with the first assembly structure.

[0016] In some embodiments of the present application, a first guide structure is provided on at least one circuit breaker housing, and a second guide structure is provided on the leakage transformer. The first guide structure and the second guide structure form a guiding match to ensure that the second assembly structure of the leakage transformer is aligned with the first assembly structure.

[0017] In some embodiments of the present application, one of the first assembly structure and the second assembly structure includes a hook, and the other includes a slot, and the hook and the slot form a snap-fit ​​fixation.

[0018] In some embodiments of the present application, each circuit breaker housing includes a first housing and a second housing; the circuit breaker unit farthest from the control unit is the end circuit breaker unit; among the other circuit breaker units between the end circuit breaker unit and the control module, at least one circuit breaker unit has a first housing and / or a second housing formed by piecing together two or more sub-housings, and at least a portion of the accommodating space is formed by piecing together the sub-housings.

[0019] In some embodiments of the present application, the number of the circuit breaker units is three or four poles, the circuit breaker unit farthest from the control unit is the end circuit breaker unit, and the circuit breaker unit closest to the control unit is the head-end circuit breaker unit; it also includes a fixing plate, the fixing plate is at least partially in the accommodating space, the first assembly structure is arranged on the fixing plate, and the fixing plate is provided with a threading hole located in the accommodating space; the fixing plate is clamped and fixed between any two adjacent circuit breaker units except the head-end circuit breaker unit, or the fixing plate is fixed on the circuit breaker housing of any circuit breaker unit except the head-end circuit breaker unit.

[0020] In some embodiments of the present application, the number of the circuit breaker units is two poles, three poles, or four poles, and the circuit breaker unit farthest from the control unit is the end circuit breaker unit. The end circuit breaker unit includes a first shell and a second shell. A first through hole is provided on the first shell, and the first through hole is a component of the accommodating space. The first assembly structure is arranged on the second shell and corresponds to the position of the first through hole.

[0021] Compared with the prior art, the present invention has the following advantages: The first assembly structure and the second assembly structure are fixed in a snap-fit ​​manner, so that the leakage transformer is fixed to the circuit breaker housing. This fixation is a relatively tight connection, that is, the leakage transformer can move with the circuit breaker housing. This structure is different from the prior art (the prior art is only loosely arranged in the circuit breaker unit, that is, the leakage transformer is directly placed in the circuit breaker housing), making the installation of the leakage transformer more stable (including both the stability of the mechanical structure level and the stability of the electrical connection level of the leakage transformer). At the same time, such a structure also provides a prerequisite for automated production and assembly, because the leakage transformer will be able to be fixed together with the circuit breaker housing to form an assembly, and then the control module and the assembly can be completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A three-dimensional diagram of a two-pole solution of a small leakage circuit breaker according to an embodiment of the present application is shown; Figure 2 Shows Figure 1 A schematic diagram of the assembly formed by the leakage current transformer and the circuit breaker unit and the installation of the control module; Figure 3 Shows Figure 1 Schematic diagram of the installation of leakage transformer and circuit breaker unit; Figure 4 A cross-sectional view of a two-pole solution of a small leakage circuit breaker according to an embodiment of the present application is shown; Figure 5 A three-dimensional cross-sectional view of a 2-pole circuit breaker housing of a small leakage circuit breaker according to an embodiment of the present application is shown; Figure 6 A schematic diagram of a leakage transformer according to an embodiment of the present application is shown; Figure 7 A three-dimensional diagram of a 4-pole solution of a small leakage circuit breaker according to an embodiment of the present application is shown; Figure 8 A cross-sectional view of a 4-pole solution of a small leakage circuit breaker according to an embodiment of the present application is shown; Fig. 9 A 3D cross-sectional view of a 4-pole circuit breaker housing of a small leakage circuit breaker according to an embodiment of the present application is shown; Fig.10 A schematic diagram of a fixing plate in a 4-pole solution of a small leakage circuit breaker according to an embodiment of the present application is shown; Fig.11 The schematic diagram of the installation of the leakage current transformer and the fixing plate in the 4-pole solution of the small leakage current circuit breaker in the embodiment of the present application is shown; Fig.12 A schematic diagram of the installation of a fixing plate in a 4-pole solution of a small leakage circuit breaker according to an embodiment of the present application is shown; Fig.13 A schematic diagram showing a second housing of a circuit breaker housing (non-terminal circuit breaker unit) according to an embodiment of the present application is shown; Fig.14 A schematic diagram of a 4-pole solution of a small leakage circuit breaker according to an embodiment of the present application after some sub-shells are removed is shown; Fig.15 A schematic diagram of the wiring of the leakage transformer of the 4-pole scheme of the small leakage circuit breaker in the embodiment of the present application is shown. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0027] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature. Example

[0029] like Figure 1-15 As shown, the embodiment of the present application is a small leakage circuit breaker, which is an intelligent circuit breaker and includes a control unit C and a circuit breaker unit L.

[0030] The control unit C is arranged on one side of a circuit breaker unit L, specifically on one side of the first direction D of the circuit breaker. The control unit C includes a control housing and a circuit board assembly 101. The circuit board assembly 101 is arranged inside the control housing, where the circuit board assembly 101 includes a leakage protection circuit, and the leakage transformer 400 is a sampling element of the leakage protection circuit. Since the leakage protection circuit itself is a conventional method, it will not be described in detail here.

[0031] The number of poles of the circuit breaker unit L is at least two but less than five.

[0032] Taking the four-pole as an example, the four-pole circuit breaker units L are arranged in sequence along the first direction D, and then the four-pole circuit breaker units L are assembled together with the control unit C. The assembly here adopts the method of rivet fastening. Of course, in addition to this, other methods such as screw fastening and clamping fixation can also be used for assembly. According to the distance from the control unit C, they are divided into the first end circuit breaker unit L1, the second circuit breaker unit L2, the third circuit breaker unit L3 and the end circuit breaker unit L4 from near to far.

[0033] Taking three poles as an example, the three-pole circuit breaker units L are arranged in sequence along the first direction D, and the fastening method is the same as that of the four poles, which will not be repeated here. According to the distance from the control unit C, they are divided into the first end circuit breaker unit L1, the second circuit breaker unit L2 and the end circuit breaker unit L4 from near to far.

[0034] Taking two poles as an example, the two-pole circuit breaker units L are arranged in sequence along the first direction D, and the fastening method is the same as that of the four poles, which will not be repeated here. According to the distance from the control unit C, they are divided into the head end circuit breaker unit L1 and the end circuit breaker unit L4 from near to far.

[0035] Regardless of the number of poles of the circuit breaker, each circuit breaker unit L includes a circuit breaker housing 300 and components such as a main line conductor, an operating mechanism, an arc extinguishing chamber, and a magnetic release located inside the circuit breaker housing 300 .

[0036] Here, the main line conductor includes a first terminal, a first terminal board, a static contact, a solenoid, a static contact, a moving contact, a bimetallic strip, a connecting conductor 200, a second terminal board, a second terminal, and the like.

[0037] The first connecting terminal is arranged on a portion of the first terminal board, the first terminal board is welded to one end of the solenoid, and the static contact is welded to the other end of the solenoid.

[0038] The second connecting terminal is arranged on a part of the second terminal plate, the second terminal plate is welded to the connecting conductor 200, the connecting conductor 200 is welded to the bimetallic strip, and the bimetallic strip is welded to the moving contact.

[0039] Here, the connection conductor 200 adopts a soft connection method, and all the connection conductors 200 pass through the central hole 401 of the leakage transformer 400. The connection conductor 200 here is provided with an insulating tube or wrapped with insulating glue to ensure the insulation performance between each connection conductor 200. Of course, in addition to this, the connection conductor 200 can also be a hard busbar method, or a combination of a soft connection and a hard busbar method.

[0040] The moving contact is arranged on the operating mechanism, and the moving and static contacts are connected and separated under the action of the operating mechanism, that is, the circuit breaker unit L is connected and disconnected.

[0041] For each circuit breaker unit L, a position of its circuit breaker housing 300 is interconnected, which is the position where the connecting conductor 200 is located. This connection refers to the connection in the first direction D, and together form a receiving space S. As for the center hole 401 of the leakage transformer 400, in this embodiment, it is located in two adjacent circuit breaker housings 300. Of course, this location in two adjacent circuit breaker housings 300 is not limited to the structure of the two-pole circuit breaker unit L, and is also applicable to three-pole and four-pole circuit breaker units. Of course, in addition to this, the center hole 401 of the leakage transformer 400 can also be located in three circuit breaker housings 300 arranged in sequence or in four circuit breaker housings 300 arranged in sequence; as long as it is located in at least two adjacent circuit breaker housings 300.

[0042] Such a setting of the accommodating space S and the distribution of the central hole 401 of the leakage transformer 400 are for the purpose of installing the leakage transformer 400 and are also conducive to the connection conductor 200 passing through the central hole 401 of the leakage transformer 400 .

[0043] Here, the second assembly structure 402 of the leakage transformer 400 is fixedly connected with the first assembly structure 310 in the accommodating space S, so that the leakage transformer 400 is fixed with the circuit breaker housing 300. Fixed together here means that the two form an assembly, and after the assembly is completed, the position of the leakage transformer 400 in the circuit breaker housing 300 is fixed. Here, the leakage transformer 400 is fixed with the circuit breaker housing 300, which does not specifically mean that the leakage transformer 400 has a fixed relationship with each circuit breaker housing 300; rather, the leakage transformer 400 is fixed with the first assembly structure 310, and the first assembly structure 310 has a fixed relationship with one or some circuit breaker housings 300 (see the description of the pole and the internal structure of the pole below for more details).

[0044] Such a fixing method of the leakage transformer 400 can make the leakage transformer 400 form a relatively tight connection with the circuit breaker housing 300, which is different from the loose setting method in the prior art, making the installation of the leakage transformer 400 more stable (including both the stability of the mechanical structure level and the stability of the electrical connection level of the leakage transformer 400). At the same time, such a structure also provides a prerequisite for automated production and assembly, because the leakage transformer 400 can be fixed together with the circuit breaker housing 300 to form an assembly, and then the control unit C can be assembled with the assembly.

[0045] For the leakage transformer 400, from the first direction D, the end close to the control unit C is the first end 410, and the end away from the control unit C is the second end 420. The second assembly structure 402 here is arranged in the area S100 between the axis P of the central hole 401 of the leakage transformer 400 and the second end 420. The arrangement is adopted in this way so that the first assembly structure 310 and the second assembly structure 402 are away from the control unit C. After the leakage transformer 400 and the circuit breaker housing 300 form an assembly, it is only necessary to connect the circuit board assembly 101 to the first end 410 (electrically connect) and then complete the assembly, which is very convenient for assembly.

[0046] There are many ways to electrically connect the leakage transformer 400 with the circuit board assembly 101. As a preferred method, a connector is used. Specifically, a first connector 411 is directly set on the first end 410, and a second connector is set on the circuit board assembly 101. The first connector 411 and the second connector are plugged together to form an electrical connection between the leakage transformer 400 and the circuit board assembly 101. Here. The first connector 411 is a plug, and the second connector is a socket; of course, the settings can also be swapped. This method of directly setting a connector on the leakage transformer 400 and plugging it into the circuit board not only makes the electrical connection of the leakage transformer 400 more convenient; it is combined with the above-mentioned first assembly structure 310 and the second assembly structure 402 being set near the second end 420, which can make the entire product assembly smoother and simpler, laying the foundation for realizing automated production.

[0047] For the installation of the leakage transformer 400, a first through hole 301 is provided on the circuit breaker housing 300 of the head-end circuit breaker unit L1, and the first through hole 301 is connected to the accommodating space S. In this way, the leakage transformer 400 can be pushed in from the first through hole 301 (the pushing direction is the first direction D), until the first assembly structure 310 and the second assembly structure 402 are snap-fitted. In this way, the design of the first through hole 301 is combined with the above-mentioned first assembly structure 310 and the second assembly structure 402 being arranged near the second end 420, and the leakage transformer 400 only needs to be pushed in from the first through hole 301 until the installation is completed, making the installation of the leakage transformer 400 simpler and more convenient.

[0048] A first guide structure 302 is provided on the circuit breaker housing 300, and a second guide structure 403 is provided on the leakage transformer 400. The first guide structure 302 and the second guide structure 403 form a guide match, so that the second assembly structure 402 of the leakage transformer 400 can be aligned with the first assembly structure 310. Here, the first guide structure 302 is a protrusion, and the second guide structure 403 is a groove. Through such a guide match, it is ensured that the first assembly body and the second assembly body can be quickly aligned to complete the assembly; at the same time, the leakage transformer 400 can be pushed into the first through hole 301 until the installation is completed, which becomes simpler; of course, it can also play a fool-proof effect (if the two guide structures are not aligned, the leakage transformer 400 will not be assembled). Here, the first guide structure 302 can also be changed to a groove, and the second guide structure 403 can also be changed to a protrusion. Of course, the first guiding structure 302 is provided on the circuit breaker housing 300 here, which does not mean that every circuit breaker housing 300 needs to be provided with the first guiding structure 302, but at least one circuit breaker housing 300 only needs to be provided with the first guiding structure 302.

[0049] Each circuit breaker housing 300 includes a first housing 320 and a second housing 330. Among the other circuit breaker units L between the terminal circuit breaker unit L4 and the control unit C, at least one circuit breaker unit L has a first housing 320 and / or a second housing 330 formed by two or more sub-housings, and at least a part of the accommodation space S is formed by the sub-housings. The following is an introduction to the two-pole and four-pole structures. Taking the two-pole structure as an example, the first-end circuit breaker unit L1 is located between the terminal circuit breaker unit L4 and the control unit C. The second shell 330 of the first-end circuit breaker unit L1 is formed by two sub-shells (respectively, the second sub-shell I 330a and the second sub-shell II 330b). The second sub-shell I 330a and the second sub-shell II 330b also form a part of the accommodating space S after splicing.

[0050] Taking the four-pole structure as an example, the first-end circuit breaker unit L1, the second circuit breaker unit L2, and the third circuit breaker unit L3 are all located between the terminal circuit breaker unit L4 and the control unit C. The second shells 330 of the first-end circuit breaker unit L1, the second circuit breaker unit L2, and the third circuit breaker unit L3 are all formed by two sub-shells (respectively, the second sub-shell I 330a and the second sub-shell II 330b). After splicing, the second sub-shell I 330a and the second sub-shell II 330b also form a part of the accommodating space S. In this way, after the second sub-shell II 330b is disassembled, the connecting conductor 200 can be operated, which provides certain convenience for the connecting conductor 200 to pass through the leakage transformer 400.

[0051] Of course, in addition to this, more sub-shells may be assembled, or fewer second shells 330 may be assembled by sub-shells, or the first shell 320 may also be assembled by sub-shells.

[0052] Regardless of the method, since the sub-shell is also part of the accommodating space S (that is, at least part of the accommodating space S is formed by piecing together the sub-shells), the connecting conductor 200 can be operated after the sub-shell is disassembled, which provides a certain convenience for the connecting conductor 200 to pass through the leakage transformer 400.

[0053] For the first assembly structure 310 and the second assembly structure 402, in order to achieve the snap connection, one of them includes a snap hook 310a and the other includes a snap slot, and the snap hook 310a and the snap slot are snap-fitted and fixed. The cooperation between the snap hook 310a and the snap slot makes the installation of the leakage transformer 400 more convenient.

[0054] In this embodiment, the hook 310a is arranged in the first assembly structure 310, and the slot is arranged in the second assembly structure 402. In addition to the hook 310a, the first assembly structure 310 also has two groups of limiting parts 310b, and the two groups of limiting parts 310b are arranged at intervals in the second direction F. The limiting parts 310b here are limiting protrusions. Since the two groups of limiting parts 310b are arranged at intervals, part of the leakage transformer 400 (the part where the second end 420 is located) is located in the space formed by the two groups of limiting parts 310b, so that the limiting parts 310b can limit the leakage transformer 400 in the second direction F. Of course, the limiting here can also be limited in both the second direction F and the third direction H at the same time, as long as it is limited in at least the second direction F. The hook 310a is a clamping part, and the connectable part between it and the second assembly structure 402 is located between the intervals of the two groups of limiting parts 310b. Such a limiting portion 310 b combined with the design of the clamping portion makes the installation of the leakage transformer 400 more compact and is also conducive to limiting the position of the leakage transformer 400 .

[0055] Of course, in addition to the limiting portion 310b, an abutting portion 310c is also provided in the first assembly structure 310. Here, since the second end 420 of the leakage transformer 400 is in the shape of an arc, the shape of the abutting portion 310c is also in line with it. In this way, after the leakage transformer 400 is installed, the second end 420 of the leakage transformer 400 abuts on the abutting portion 310c, and the clamping portion and the abutting portion 310c jointly clamp the second assembly structure 402. Of course, in addition to this, the second assembly structure 402 can also be clamped only with the clamping portion. No matter which method is used, the setting of the abutting portion 310c is conducive to limiting the assembly of the leakage transformer 400 and ensuring the stability of the installation.

[0056] Here, since a part of the shape of the leakage transformer 400 is an arc structure 400a, the second end 420 of the leakage transformer 400 is a part of the arc structure 400a, and the second assembly structure 402 is a lug, and the slot mentioned above is formed by the surface of the lug and the arc structure 400a. Such a lug setting is combined with the way of setting the second assembly structure 402 near the second end 420. Such a structure is more conducive to the assembly of the leakage transformer 400. When assembling, the assembler presses the leakage transformer 400 in, so that the lug opens the hook 310a, and the hook 310a is hooked in the slot. As a more preferred method, the surface of the lug adopts a curved surface, which is more conducive to the lug opening the hook 310a.

[0057] There are many ways for the first assembly structure 310 to be arranged in the accommodating space S. It can be integrated with the circuit breaker housing 300 or separated from the circuit breaker housing 300 .

[0058] Take the integrated one as an example, Figure 5 As shown, the structure of the two-pole circuit breaker unit L, the circuit breaker unit L farthest from the control unit C is the end circuit breaker unit L4. A first through hole 301 is provided on the first housing 320 of the end circuit breaker unit L4, and the first through hole 301 is a component of the accommodating space S. The second end 420 of the leakage transformer 400 passes through the first through hole 301 and penetrates into the circuit breaker housing 300 of the end circuit breaker unit L4. The first assembly structure 310 is arranged on the second housing 330 and corresponds to the position of the first through hole 301. Here, the first assembly structure 310 and the second housing 330 are integrated. In this way, the first assembly structure 310 is integrally formed when the second housing 330 is injection molded, which is very convenient to process and requires few parts. Of course, in addition to being applicable to the two-pole circuit breaker unit L, such a structure can also be applied to the three-pole and four-pole situations.

[0059] Taking the split body as an example, Figure 9-12As shown, the structure of the four-pole circuit breaker unit L, the first assembly structure 310 is arranged on the fixed plate 340. Here, the fixed plate 340 includes a main body 340a and a mounting portion 340b around the main body 340a, wherein the main body 340a is in the accommodating space S, and the fixed plate 340 is also provided with a threading hole 340c, wherein the threading hole 340c is also located in the accommodating space S, and part of the connecting conductor 200 can pass through the threading hole 340c. In this way, the fixed plate 340 is clamped between two adjacent circuit breaker units L, specifically between the second circuit breaker unit L2 and the third circuit breaker unit L3, wherein the mounting portion 340b is clamped by the circuit breaker housings 300 of the two units. Of course, in addition to this, it can also be clamped between the third circuit breaker unit L3 and the end circuit breaker unit L4. Alternatively, the fixing plate 340 is directly fixed to a circuit breaker housing 300 without adopting the clamping fixing method. There are many fixing methods, such as clamping fixing, screw fixing, riveting fixing, etc. Regardless of the method of fixing to a circuit breaker housing 300 or the clamping fixing method, it is sufficient as long as it is not related to the head-end circuit breaker unit L1, because this can ensure that the central hole 401 of the leakage transformer 400 is located in at least two adjacent circuit breaker housings 300.

[0060] Although this fixing plate 340 method separates the first assembly structure 310 from the integrated structure, the circuit breaker housing 300 itself is rarely modified, making the circuit breaker housing 300 more versatile (because the integrated structure allows the circuit breaker housing 300 to be used only for installing the leakage transformer 400 and cannot be used for other purposes). At the same time, this fixing plate 340 method can be used in three-pole circuit breakers in addition to four-pole circuit breakers.

[0061] The first direction D mentioned above refers to a width direction, the second direction F refers to a length direction, and the third direction H refers to a height direction.

[0062] Of course, in addition to the above-mentioned intelligent (including electric operation) small leakage circuit breaker, the above-mentioned installation structure of the leakage transformer 400 is also applicable to non-intelligent star intelligent (excluding electric operation) small leakage circuit breakers.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0064] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A small leakage circuit breaker, comprising a control unit and at least two-pole circuit breaker units; each circuit breaker unit is assembled in sequence along a first direction, and the control unit is assembled beside one of the circuit breaker units; the control module comprises a control housing and a circuit board assembly arranged inside the control housing; characterized in that: The circuit breaker unit includes a circuit breaker housing, and a part of each circuit breaker housing is connected in a first direction to form an accommodation space; it also includes a leakage transformer, which is located in the accommodation space, and the central hole of the leakage transformer is located in at least two adjacent circuit breaker housings, and the leakage transformer is electrically connected to the circuit board assembly; a first assembly structure is arranged in the accommodation space, and a second assembly structure is arranged on the transformer, and the first assembly structure is fixed to the second assembly structure by snapping, so as to fix the leakage transformer and the circuit breaker housing together.

2. A small leakage circuit breaker according to claim 1, characterized in that: In the first direction, the end of the leakage transformer close to the control module is the first end, and the end away from the control module is the second end; the second assembly structure is arranged in the area between the axis line of the center hole of the leakage transformer and the second end, or the second assembly structure is arranged on the second end.

3. A small leakage circuit breaker according to claim 2, characterized in that: The first assembly structure includes a clamping portion and two groups of limiting portions; the second assembly structure is clamped and fixed with the clamping portion; part of the leakage transformer is located in the space formed by the two groups of limiting portions, the two groups of limiting portions limit the leakage transformer at least in the second direction, and the clamping portion between the second assembly structure and the clamping portion is located between the two groups of limiting portions; Or, the first assembly structure includes an abutment portion and a clamping portion; the second end of the leakage transformer is arc-shaped, and the abutment portion abuts against the second end; the second assembly structure and the clamping portion form a clamping fit, or the second assembly structure, the clamping portion and the abutment portion jointly form a clamping fixation.

4. A small leakage circuit breaker according to claim 2, characterized in that: The outer shape of the leakage transformer has at least one section that is an arc-shaped structure, and the second end is part of the arc-shaped structure; the second assembly structure is a lug arranged on the arc-shaped structure, and the lug and the arc-shaped structure together form a slot; the first assembly structure includes a hook that is adapted to the slot, and the hook and the slot form a snap fit.

5. A small leakage circuit breaker according to claim 1, characterized in that: In the first direction, the end of the leakage transformer close to the control module is the first end, and a first connector is arranged on the first end; a second connector is arranged on the circuit board assembly, and the first connector and the second connector are plugged into each other to form an electrical connection between the leakage transformer and the circuit board assembly.

6. A small leakage circuit breaker according to claim 2, characterized in that: The circuit breaker unit adjacent to the control unit is a head-end circuit breaker unit. A first through hole is provided on the surface of the circuit breaker housing of the head-end circuit breaker unit adjacent to the control unit. The first through hole is connected to the accommodating space. After the leakage transformer is pushed in through the first through hole, the second assembly structure is snap-fitted with the first assembly structure.

7. A small leakage circuit breaker according to claim 6, characterized in that: A first guide structure is provided on at least one circuit breaker housing, and a second guide structure is provided on the leakage transformer. The first guide structure and the second guide structure form a guiding match to ensure that the second assembly structure of the leakage transformer is aligned with the first assembly structure.

8. A small leakage circuit breaker according to claim 1, characterized in that: The first assembly structure and the second assembly structure, one of them includes a hook, and the other includes a slot, and the hook and the slot are fixed by a snap connection.

9. A small leakage circuit breaker according to claim 1, characterized in that: Each circuit breaker housing includes a first housing and a second housing; the circuit breaker unit farthest from the control unit is the end circuit breaker unit; among the other circuit breaker units between the end circuit breaker unit and the control module, the first housing and / or the second housing of at least one circuit breaker unit is formed by piecing together two or more sub-housings, and at least a part of the accommodating space is formed by piecing together the sub-housings.

10. The miniature residual current circuit breaker according to any one of claims 1 to 8, characterized in that: The number of the circuit breaker units is three or four poles, the circuit breaker unit farthest from the control unit is the end circuit breaker unit, and the circuit breaker unit closest to the control unit is the head end circuit breaker unit; it also includes a fixing plate, the fixing plate is at least partially in the accommodating space, the first assembly structure is arranged on the fixing plate, and the fixing plate is provided with a threading hole located in the accommodating space; the fixing plate is clamped and fixed between any two adjacent circuit breaker units except the head end circuit breaker unit, or the fixing plate is fixed on the circuit breaker housing of any circuit breaker unit except the head end circuit breaker unit; Or, the number of the circuit breaker units is two poles, three poles, or four poles, the circuit breaker unit farthest from the control unit is the end circuit breaker unit, the end circuit breaker unit includes a first shell and a second shell, a first through hole is provided on the first shell, the first through hole is a component of the accommodating space, and the first assembly structure is arranged on the second shell and corresponds to the position of the first through hole.

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