Miniature circuit breaker with mutual inductor

Abstract

The miniature circuit breaker comprises at least one pole of circuit breaker module, each pole of circuit breaker module comprises a circuit breaker shell, a main line conductor and the mutual inductor, the main line conductor is arranged in the circuit breaker shell, and the main line conductor is sleeved with the mutual inductor; wherein the mutual inductor comprises a magnetic ring and a mutual inductor housing for accommodating the magnetic ring, the axis of a central hole of the magnetic ring is perpendicular to a first direction, and the first direction is the width direction of the circuit breaker module; avoiding holes communicated with the outside are formed in the two side walls, in the first direction, of the circuit breaker shell, and the mutual inductor cover shell is provided with penetrating parts filled in the avoiding holes; the mutual inductor housing and the side wall form an insulation protection structure in the avoiding hole or in the avoiding hole; the transformer has the advantages of being good in insulation performance and beneficial to placement of the transformer.

Description

Technical Field

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

[0002] In the field of small circuit breakers, the application of transformers is indispensable to achieve metering, overcurrent protection, self-power supply and other related functions. However, the transformers used to achieve different specific functions are different. For example, in order to achieve the metering function, a metering transformer is used. For another example, in order to achieve short-circuit protection or overload protection, a protection transformer is used. In order to achieve self-generated power supply, a current transformer is used.

[0003] The above-mentioned transformers are basically set up in the same way, and are all set on the main line conductor for sampling. At present, the solution often used in small circuit breakers is a splicable small circuit breaker with voltage and current sensors as disclosed in CN207834219U. The transformer adopts a solution in which the axis direction of the center hole is parallel to the width direction of the circuit breaker, so that a relatively larger transformer can be selected to ensure the sampling accuracy. The reason why the transformer adopts this method is that the width dimension of the single-pole circuit breaker module is limited (generally 18mm), and the diameter of the transformer is generally larger than its own thickness dimension, so this placement method can only be adopted. If the transformer is placed in a way that the axis direction of the center hole is perpendicular to the width direction, due to the large diameter of the transformer, the shell of the single-pole circuit breaker module needs to be made very thin to place the transformer, but the thin wall will cause the place to be easily punctured, posing a safety hazard.

[0004] Moreover, for the main line conductor inside the single-pole circuit breaker module, it is generally distributed along the second direction of the single pole. In order to adapt to the placement of the mutual inductor such as CN207834219U, in order to allow the main line conductor to pass through the mutual inductor, a total of at least 6 bends are required from the terminal block to the section where the mutual inductor is passed (such as Fig.18 As shown in the figure, too many bends will have a great impact on the sampling accuracy of the transformer (too many bends will lead to more current directions, and different current directions will lead to different magnetic field directions, thus affecting the sampling accuracy; too many bends will also cause changes in the conductor's resistance, inductance, hot spots, etc., thus affecting the sampling accuracy).

[0005] Of course, as a relatively simple way, it is to select a very small transformer (small enough to be placed inside the single-pole circuit breaker module together with its shell), and then place it in a way that the axis direction of the center hole is perpendicular to the width direction. Although this can reduce the number of main line conductor bends, the sampling accuracy of the transformer is directly related to its size. Obviously, using a smaller transformer is not a preferred solution.

[0006] Therefore, how to more reasonably design a transformer in which the central hole axis direction is perpendicular to the width direction and still ensure the insulation performance of each single-pole circuit breaker module is a direction worthy of research. Summary of the invention

[0007] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide a miniature circuit breaker with a transformer.

[0008] The present application provides: a small circuit breaker with a mutual inductor, which includes at least one-pole circuit breaker module, each of which includes a circuit breaker housing, a main line conductor and a mutual inductor, the main line conductor is arranged in the circuit breaker housing, and the mutual inductor is sleeved on the main line conductor; wherein the mutual inductor includes a magnetic ring and a mutual inductor cover for accommodating the magnetic ring, the axis of the center hole of the magnetic ring is perpendicular to a first direction, and the first direction is the width direction of the circuit breaker module; avoidance holes connected to the outside are opened on both side walls of the circuit breaker housing in the first direction, and the mutual inductor cover has a penetration portion filling the avoidance hole; the mutual inductor cover and the side walls form an insulating protection structure in the avoidance hole or in the avoidance hole.

[0009] In some embodiments of the present application, a first step is provided at the avoidance hole, a second step adapted to the first step is provided on the transformer cover, and the first step and the second step together form an insulating protection structure.

[0010] In some embodiments of the present application, the side wall has an inner surface, and the hole wall of the avoidance hole and a portion of the inner surface are components of the first step; the penetration portion is located on the side surface of the transformer cover, and the penetration portion and a portion of the side surface are components of the second step.

[0011] In some embodiments of the present application, the side wall has an inner surface, a positioning groove is provided on the inner surface, and the avoidance hole is opened at the bottom of the positioning groove; a positioning block is provided on the transformer cover, the positioning block is at least partially located in the positioning groove, and the penetration portion is provided on the positioning block; the hole wall of the avoidance hole and the bottom of the positioning groove are components of the first step; the penetration portion and a part of the positioning block are components of the second step.

[0012] In some embodiments of the present application, the side wall has an inner surface, the insulating protection structure includes a first plug-in portion arranged on the hole wall or inner surface of the avoidance hole, and a second plug-in portion is arranged on the transformer cover, and the first plug-in portion and the second plug-in portion are plugged together to form the insulating protection structure.

[0013] In some embodiments of the present application, the side wall has a first outer surface, an opening of the avoidance hole is located on the first outer surface, an elevated portion is provided on the first outer surface, and the elevated portion is located on at least one side of the avoidance hole; the penetration portion has a first end connected to the transformer cover and a second end away from the transformer cover, and the second end is flush with or shorter than the elevated portion.

[0014] In some embodiments of the present application, the raised portion is an annular structure, which is arranged around the avoidance hole; the number of circuit breaker modules is at least two, and each circuit breaker module is assembled sequentially along the first direction; one of the raised portions of the circuit breaker module is aligned with and abutted against one of the raised portions of the adjacent circuit breaker module.

[0015] In some embodiments of the present application, the circuit breaker housing includes a first half shell and a second half shell. In a first direction, the first half shell is located on one side of the second half shell, and the number of avoidance holes is two and is respectively arranged on the first half shell and the second half shell.

[0016] In some embodiments of the present application, the circuit breaker housing includes a first half shell and a second half shell. In a third direction, the first half shell is located above the second half shell, the avoidance hole is formed by splicing the first half shell and the second half shell, and the third direction is perpendicular to the first direction.

[0017] In some embodiments of the present application, the circuit breaker housing includes a first half shell and a second half shell, the first half shell and the second half shell together form a first terminal cavity, a mutual inductance chamber cavity, an arc extinguishing chamber cavity and a first exhaust channel, and the first exhaust channel is connected to the arc extinguishing chamber; in the second direction, the mutual inductance chamber cavity is arranged between the first terminal cavity and the arc extinguishing chamber cavity; in the third direction, the mutual inductance chamber cavity is located above the first exhaust channel; the mutual inductance chamber cavity and the first exhaust channel, as well as the mutual inductance chamber cavity and the arc extinguishing chamber are separated by the wall of the circuit breaker housing; the relationship between the first direction, the second direction and the third direction is perpendicular to each other.

[0018] In some embodiments of the present application, the side wall has an inner surface, and the avoidance hole has a chamfer or a rounded corner at the opening of the inner surface.

[0019] In some embodiments of the present application, the size of a single circuit breaker module in the first direction is S, the diameter of the magnetic ring is D, and 0.9S≥D>0.55S.

[0020] In some embodiments of the present application, the magnetic ring portion is located in the penetration portion.

[0021] In some embodiments of the present application, the main line conductor includes a terminal board and a through-going conductor, the through-going conductor and the terminal board are integrally formed or welded and fixed, and the total number of bends of the terminal board and the through-going conductor is no more than four.

[0022] In some embodiments of the present application, the axis line of the center hole of the magnetic ring is parallel to the second direction, the passing conductor includes a first section and a second section, the first section and the second section are at the same height in the third direction, the first section and the terminal board are both straight plates, the first section is used to pass through the center hole of the magnetic ring, the total number of bends between the terminal board and the passing conductor is no more than two, and the relationship between the first direction, the second direction and the third direction is perpendicular to each other.

[0023] In some embodiments of the present application, the axis line of the center hole of the magnetic ring is parallel to the second direction, the passing conductor includes a first section and a second section, the first section and the terminal board are at different heights in the third direction, the first section and the terminal board are both straight plates, the first section is used to pass through the center hole of the magnetic ring, the total number of bends of the terminal board and the passing conductor is no more than four, and the relationship between the first direction, the second direction and the third direction is perpendicular to each other.

[0024] In some embodiments of the present application, the penetrating conductor includes a first section, the first section is set at an obtuse angle or a right angle to the terminal board, the first section is used to penetrate the center hole of the magnetic ring, and the total number of bends between the terminal board and the penetrating conductor is no more than three.

[0025] In some embodiments of the present application, the main line conductor also includes a solenoid, one end of the conductor is connected to the terminal board, and the other end is welded to one end of the solenoid.

[0026] In some embodiments of the present application, a control module is also included. In the first direction, the control module is assembled on one side of one of the circuit breaker modules, and a control circuit board is provided inside the control module; a transfer circuit board is also included, and the transfer circuit board is passed through all circuit breaker housings, and one end of the transfer circuit board is electrically connected to the control circuit board; a first connector corresponding to the mutual inductor is arranged on the transfer circuit board; a second connector is arranged on the mutual inductor, and the second connector is plug-in-matched with the corresponding first connector, so that the information sampled by the magnetic ring is transmitted to the control circuit board.

[0027] Compared with the prior art, the present invention has the following advantages: The above structure is adopted to overcome the technical prejudice in this field {the technical prejudice in this field is that if the transformer adopts the setting mode that the axis line is perpendicular to the width direction of the circuit breaker, either a very small transformer must be selected (the diameter of the magnetic ring is very small, so that the entire transformer is accommodated inside the circuit breaker housing), or the two side walls of the circuit breaker housing in the width direction must be made very thin to avoid the transformer}, and the combination formed by the avoidance hole, the penetration part and the insulating protection structure can greatly increase the creepage distance, and at the same time make the volume of the transformer cover larger (to accommodate a more suitable transformer), without having to use a transformer of too small specifications.

[0028] At the same time, the axis line of the center hole of the magnetic ring and the width direction of the circuit breaker module are set to be perpendicular, which is more suitable for the distribution setting of the main line conductor of the existing small circuit breaker. Compared with the existing technology (the axis line is set parallel to the width direction of the circuit breaker module), the number of bending times of the main line conductor can be reduced and the sampling accuracy of the transformer can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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.

[0030] Figure 1 A schematic diagram of a miniature circuit breaker according to an embodiment of the present application is shown; Figure 2 A schematic diagram showing a miniature circuit breaker without a control module according to an embodiment of the present application is shown; Figure 3 A schematic diagram of a transformer in a miniature circuit breaker according to an embodiment of the present application is shown; Figure 4 An axial view of a transformer in a miniature circuit breaker according to an embodiment of the present application is shown; Figure 5 A schematic diagram of a first half shell in a miniature circuit breaker according to an embodiment of the present application is shown; Figure 6 A schematic diagram of a second half shell in a miniature circuit breaker according to an embodiment of the present application is shown; Figure 7 A 3D cross-sectional view of the installation location of a transformer in a miniature circuit breaker according to an embodiment of the present application is shown; Figure 8 A cross-sectional view of the installation location of a transformer in a miniature circuit breaker in an embodiment of the present application is shown; Fig. 9 A side view and a partial enlarged view of a miniature circuit breaker according to an embodiment of the present application are shown; Fig.10 A schematic diagram showing the main line conductor, mutual inductor, etc. of any pole circuit breaker module in an embodiment of the present application is shown; Fig.11 A schematic diagram of an implementation method of inserting a conductor and a magnetic ring in an embodiment of the present application is shown; Fig.12 A schematic diagram showing another implementation method of penetrating a conductor and a magnetic ring in an embodiment of the present application is shown; Fig.13 A schematic diagram of another implementation method of penetrating a conductor and a magnetic ring in an embodiment of the present application is shown; Fig.14 A schematic diagram showing another implementation method of inserting a conductor and a magnetic ring in an embodiment of the present application is shown; Fig.15 A schematic diagram showing the coordination between the transfer circuit board and some control modules in an embodiment of the present application is shown; Fig.16 A schematic diagram showing the coordination between the transfer circuit board and the control circuit board in an embodiment of the present application is shown; Fig.17 A schematic diagram showing the first cover after explosion in the embodiment of the present application is shown; Fig.18 A schematic diagram of placement of mutual inductors in the prior art is shown. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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

[0036] like Figure 1-17 As shown, an embodiment of the present application is a miniature circuit breaker with a transformer, and the circuit breaker includes a circuit breaker module L.

[0037] The number of poles of the circuit breaker module L is four, and the four-pole circuit breaker modules L are arranged in sequence along a first direction D, where the first direction D is the width direction of the circuit breaker module L. Of course, the number of circuit breaker modules L is not limited to four, and can also be one pole, two poles, or three poles.

[0038] Each circuit breaker module L comprises a circuit breaker housing 100 and components such as a main line conductor, a transformer 300 and an operating mechanism located inside the circuit breaker housing 100 .

[0039] Here, the mutual inductor 300 is mounted on the main line conductor to sample the main line conductor.

[0040] The structure and installation structure of each transformer 300 are similar, and the following is an introduction based on a single-pole circuit breaker module L.

[0041] The two side walls 105 of the circuit breaker housing 100 of the circuit breaker module L are provided with avoidance holes 110 , where the avoidance holes 110 are through holes, and the two side walls 105 are two side walls 105 in the first direction D.

[0042] The mutual inductor 300 includes a magnetic ring 310 and a mutual inductor housing 320, wherein the magnetic ring 310 is contained inside the mutual inductor housing 320. Here, the mutual inductor housing 320 may be a fully enclosed housing, that is, the magnetic ring 310 is completely contained in the mutual inductor housing 320. Of course, the mutual inductor housing 320 may also be a semi-enclosed housing, wherein the magnetic ring 310 is installed in the mutual inductor housing 320 and sealed by epoxy resin potting.

[0043] The axis P of the magnetic ring center hole 310a is perpendicular to the first direction D. Here, there are many directions perpendicular to the first direction D, which may be the second direction C (the length direction of the circuit breaker module L), the third direction H (the height direction of the circuit breaker module L), or other directions. The axis P of the magnetic ring center hole 310a will be described in detail below when describing the main line conductor structure.

[0044] For the transformer cover 320, it has a penetration portion 320a on both sides, and the two sides here also refer to the two sides in the first direction D. Each penetration portion 320a fills an avoidance hole 110 (here it does not specifically refer to a perfect filling without any gaps, but allows the existence of tolerances). The transformer cover 320 and the side wall 105 form an insulating protection structure in the avoidance hole 110 or the avoidance hole 110.

[0045] Through such a structure, the combination of the avoidance hole 110, the penetration portion 320a and the insulating protection structure can greatly increase the creepage distance, and can make the volume of the transformer housing 320 larger (to accommodate a more suitable transformer 300), without having to use a transformer 300 of too small specifications. At the same time, the axis P of the magnetic ring center hole 310a and the first direction D of the circuit breaker module L are set to be perpendicular to each other, which can reduce the number of bends ZW of the main line conductor and improve the sampling accuracy of the transformer 300.

[0046] Here, there are many specific forms of the insulating protection structure, which can be a stepped structure or a plug-in structure.

[0047] As a step structure, it is formed by the first step T1 and the second step T2. Here, the first step T1 is set at the avoidance hole 110, and the second step T2 is set on the transformer cover 320. The creepage distance can be effectively improved by the cooperation (adherence) of the first step T1 and the second step T2. Of course, both the first step T1 and the second step T2 can adopt multiple steps (which can be understood as multiple faces set at an angle, connected in sequence to form multiple steps), or a single step (two faces set at an angle to each other form a single step).

[0048] In this embodiment, a one-step ladder is used.

[0049] As an embodiment, the side wall 105 has an inner surface 105a, and the hole wall of the avoidance hole 110 and a part of the inner surface 105a form a first step T1. The penetration portion 320a is located on a side surface of the transformer cover 320, and the penetration portion 320a and the side surface form a second step T2. Here, the penetration portion 320a is in contact with the hole wall of the avoidance hole 110, and the side surface of the transformer cover 320 is in contact with the inner surface 105a. Of course, the in contact here does not specifically refer to perfect in contact, but allows for the existence of tolerance.

[0050] As another embodiment, the side wall 105 has an inner surface 105a, and a positioning groove 1051 is provided on the inner surface 105a, and the avoidance hole 110 is opened at the bottom of the positioning groove 1051. A positioning block 3201 is provided on the transformer cover 320, and the positioning block 3201 is at least partially located in the positioning groove 1051, and the penetration portion 320a is provided on the positioning block 3201. Here, the hole wall of the avoidance hole 110 and the bottom of the positioning groove 1051 together form a first step T1, and the penetration portion 320a and a part of the positioning block 3201 together form a second step T2. Here, the penetration portion 320a is in contact with the hole wall of the avoidance hole 110, and the positioning block 3201 is in contact with the bottom of the positioning groove 1051. Of course, the contact here does not specifically refer to perfect contact, but allows the existence of tolerance. Here, the positioning block 3201 can form a positioning fit with the positioning groove 1051 , which is beneficial to the assembly of the transformer cover 320 and the circuit breaker housing 100 .

[0051] No matter which of the above single-stage ladder structures is simple in structure and easy to form, it can meet the requirements of electrical insulation. Of course, if a better electrical insulation effect is required, a multi-stage ladder solution can also be used.

[0052] As for the plug-in structure, a first plug-in portion is provided on the inner surface 105a near the avoidance hole 110, and a second plug-in portion is provided on the transformer cover 320. The first plug-in portion and the second plug-in portion are plugged into each other to form an insulating protection structure. This plug-in structure can form an interlaced structure, which can also improve the electrical insulation performance. Of course, the first plug-in portion and the second plug-in portion here can adopt the combination of protrusions and grooves, or the combination of protrusions and protrusions. Either way, the insulation performance can be improved. At the same time, as an alternative, the first plug-in portion can also be set on the hole wall of the avoidance hole 110.

[0053] This plug-in type insulation protection structure also has good electrical insulation effect and is relatively simple to process.

[0054] Regardless of the form of the insulating protection structure, it can be a design that completely surrounds the avoidance hole 110, or a fully enclosed design. Of course, it can also be a design that semi-encloses the avoidance hole 110, that is, it protects several key directions around the avoidance hole 110. Whether it is a fully enclosed or semi-enclosed design, it can be set according to actual requirements.

[0055] As for the side wall 105, it has a first outer surface 105b, and an opening of the avoidance hole 110 is located on the first outer surface 105b. A raised portion 1052 is provided on the first outer surface 105b, and the raised portion 1052 is located on at least one side of the avoidance hole 110. The penetration portion 320a has a first end and a second end, the first end is the end of the penetration portion 320a connected to the transformer cover 320, and the second end is the end away from the transformer cover 320. The second end here does not exceed the raised portion 1052, that is, the second end is flush with the raised portion 1052 or shorter than the raised portion 1052. Such a design of the raised portion 1052 can also prevent other objects from contacting the transformer 300.

[0056] Of course, as a preferred design solution for the heightened portion 1052, the heightened portion 1052 adopts a ring structure, surrounding the avoidance hole 110. In this way, when the circuit breaker modules L with more than two poles are spliced, the two heightened portions 1052 on the adjacent surfaces of the two circuit breaker modules L can be aligned and attached to each other, and such a heightened portion 1052 with a ring structure can improve the electrical insulation performance between the circuit breaker module L and the outside.

[0057] Here, the avoidance hole 110 has a chamfer or a rounded corner at the opening of the inner surface 105 a . Such a chamfer or a rounded corner design will facilitate the penetration of the penetration portion 320 a into the avoidance hole 110 .

[0058] As for the avoidance hole 110 , its forming method is different according to the different forms of the circuit breaker housing 100 .

[0059] As a mode, the circuit breaker housing 100 includes a first half shell 101 and a second half shell 102. The first half shell 101 and the second half shell 102 are distributed in a first direction D, so each half shell is provided with an avoidance hole 110, which is also called a left and right half shell in the art.

[0060] As an alternative, it can also be changed to the form of upper and lower half shells, that is, distributed in the third direction H, that is, the first half shell 101 is located above the second half shell 102.

[0061] Of course, no matter which method is used, the first half shell 101 and the second half shell 102 can each be an integrally formed half shell, or a half shell formed by splicing two or more sub-shells.

[0062] For each circuit breaker module L, its dimension in the first direction D is S, and the diameter of the magnetic ring 310 is D1, and the relationship between D1 and satisfies 0.9S≥D1>0.55S. In the present embodiment, it is 17.8mm, and D1 is about 16mm. Of course, in addition to this, the common setting parameters of the width dimension of the single-pole circuit breaker module L in the art are 9mm, 18mm, 25mm, 36mm, etc., and the diameter D of the magnetic ring 310 only needs to satisfy 0.9S≥D1>0.55S. The magnetic ring 310 that meets such size requirements can have better precision parameters and can be suitable for the installation of the above-mentioned transformer cover 320.

[0063] For the above-mentioned magnetic ring 310, a part of it is in the insertion portion 320a. Such a design makes the insertion portion 320a also become a part of the magnetic ring 310, so that the space for accommodating the magnetic ring 310 can be increased as much as possible to adapt to a magnetic ring 310 of larger specifications.

[0064] As for the main line conductor, it includes many components, such as a first terminal, a first terminal plate 201, a through conductor 202, a solenoid 203, a stationary contact, a moving contact, a bimetallic strip, a second terminal plate, a second terminal, and the like.

[0065] Here, one end of the through conductor 202 is connected to the terminal board, and the through conductor 202 is used to pass through the center hole 310a of the magnetic ring. The through conductor 202 here is formed in one piece with the terminal board, and of course it can also be formed in parts and then fixed by welding. Here, the total number of bends ZW of the terminal board and the through conductor 202 is no more than four. By controlling the number of bends ZW below this number, the influence of the sampling of the mutual inductor 300 can be reduced as much as possible.

[0066] There are many ways to set it up. Take one of them as an example. Fig.11 As shown, the axis P of the center hole 310a of the magnetic ring is parallel to the second direction C. The through conductor 202 includes a first section 2021 and a second section 2022. In the third direction H, the first section 2021 and the second section 2022 are at the same height. The first section 2021 and the first terminal plate 201 are both straight plates, and the two form a flat plate-shaped structure; the first section 2021 is used to penetrate the center hole 310a of the magnetic ring, and the first terminal plate 201 is used to penetrate the first terminal. In such a structure, the total number of bends ZW of the first terminal plate 201 and the through conductor 202 is two, and both are mainly distributed on the connection between the second section 2022 and other components of the main line conductor (such as the solenoid 203). Such a structure has very few bends ZW, which minimizes the influence of the bend ZW structure on the sampling of the mutual inductor 300.

[0067] Take another example, Fig.12 As shown, the axis P of the center hole 310a of the magnetic ring is also parallel to the second direction C. The through conductor 202 also includes a first section 2021 and a second section 2022. However, the first section 2021 and the first terminal plate 201 are at different heights in the third direction H, that is, there are two bends ZW between the two. Here. The first section 2021 is used to penetrate the center hole 310a of the magnetic ring, and the first terminal plate 201 is used to penetrate the first terminal. Here, the total number of bends ZW of the first terminal plate 201 and the through conductor 202 is four, two of which are distributed on the connection between the second section 2022 and other components of the main line conductor (such as the solenoid 203), and the other two are distributed at the connection with the first terminal plate 201. Although the number of bends ZW in such a structure is four, compared with the structure with more than six in the prior art, the number of bends ZW has been reduced by at least two. At the same time, such arrangement of the penetrating conductor 202 allows the mutual inductor 300 to avoid some structures inside the circuit breaker, providing a possibility for arranging other components.

[0068] Take another way as an example, Fig.13 As shown, the axis P of the center hole 310a of the magnetic ring is parallel to the third direction H. The through conductor 202 includes a first section 2021, and the first section 2021 is arranged at a right angle to the first terminal plate 201. The first section 2021 is used to penetrate the center hole 310a of the magnetic ring. The total number of bends ZW between the first terminal plate 201 and the through conductor 202 is two. Two are distributed at the connection between the first section 2021 and the first terminal plate 201, and on the connection between the through conductor 202 and other components of the main line conductor (such as the solenoid 203). With this structure, the total number of bends ZW between the first terminal plate 201 and the through conductor 202 does not exceed three, and the influence of the bend ZW structure on the sampling of the transformer 300 is reduced as much as possible.

[0069] Taking another implementation as an example, Fig.14 As shown, the axis P of the center hole 310a of the magnetic ring is perpendicular to the first direction D, but not parallel to the second direction C and the third direction H. In this way, the penetrating conductor 202 includes a first section 2021, and the first section 2021 and the first terminal plate 201 are set at an obtuse angle. The first section 2021 is used to penetrate the center hole 310a of the magnetic ring, and the total number of bends ZW between the first terminal plate 201 and the penetrating conductor 202 is two. Two are distributed at the connection between the first section 2021 and the first terminal plate 201, and on the connection between the penetrating conductor 202 and other components of the main line conductor (such as the solenoid 203). With this structure, the total number of bends ZW between the first terminal plate 201 and the penetrating conductor 202 does not exceed three, minimizing the influence of the bend ZW structure on the sampling of the transformer 300.

[0070] Of course, one end of the through conductor 202 in the above example is connected to the first terminal plate 201, and the other end is welded to the solenoid 203. In addition, the through conductor 202 can also be connected between the second terminal plate and the bimetallic strip. At the same time, although the through conductor 202 in the example is a hard busbar structure, it can also be changed to a soft connection form. When it is a soft connection form, the bend ZW can be understood as the number of bends of the soft connection.

[0071] For this solution in which one end of the through-conductor 202 is connected to the first terminal plate 201 and the other end is welded to the solenoid 203. In this case, the circuit breaker housing 100 includes a terminal cavity 120, a mutual inductance chamber 130, an arc extinguishing chamber 140 and a first exhaust channel 150, and the first exhaust channel 150 is connected to the arc extinguishing chamber 140. The terminal cavity 120 is used to place the first terminal, and the arc extinguishing chamber 140 is used to place the arc extinguishing chamber. The extinguished arc gas passes through the arc extinguishing chamber 140 and is discharged from the first exhaust channel 150. In this way, the first half shell 101 and the second half shell 102 are assembled to form the terminal cavity 120, the mutual inductance chamber 130, the arc extinguishing chamber 140 and the first exhaust channel 150. In the second direction C, the mutual inductance chamber 130 is arranged between the terminal cavity 120 and the arc extinguishing chamber 140. In the third direction H, the mutual inductance chamber 130 is located above the first exhaust channel 150. The mutual inductance chamber 130 and the first exhaust channel 150 as well as the mutual inductance chamber 130 and the arc extinguishing chamber are separated from each other, specifically by using the wall of the circuit breaker housing 100 after the first half shell 101 and the second half shell 102 are assembled.

[0072] The circuit breaker comprises a control module Z.

[0073] The control module Z is disposed on one side of a circuit breaker module L in the first direction D. The control module Z includes a module housing 400 and a control circuit board 500 . The control circuit board 500 is disposed inside the module housing 400 .

[0074] The adapter circuit board 600 is used to realize the electrical connection between the transformer 300 and the control circuit board 500. Here, one end of the adapter circuit board 600 is electrically connected to the control circuit board 500, and the other end extends along the first direction D, so that the adapter circuit board 600 is arranged in all circuit breaker housings 100. The adapter circuit board 600 has a first connector 601 corresponding to each circuit breaker housing 100, that is, the first connector 601 is arranged in the circuit breaker housing 100 of each corresponding circuit breaker module L. A second connector (not shown in the figure) is arranged on the transformer 300, and the second connector forms a plug-in fit with the first connector 601. Here, the first connector 601 and the second connector are relative and adapted concepts, for example, the first connector 601 is a socket, and the second connector is a plug. Here, the second connector can be directly fixed on the transformer housing 320, or it can be led out through a wire.

[0075] There are many ways to electrically connect the adapter circuit board 600 and the control circuit board 500. For example, a connector or a soft wire is used. In this embodiment, in order to facilitate the assembly of the product, a third connector 501 is provided on the control circuit board 500, and a fourth connector 602 is provided on the adapter circuit board 600. The fourth connector 602 and the third connector 501 are plugged together to form an electrical connection. Here, the data sampled by the mutual inductor 300 has many uses, which can be for metering (in this case, the control circuit board 500 includes a metering ground circuit), for fault protection (in this case, the control circuit board 500 includes a short circuit protection circuit, an overload protection circuit, etc.), or for power supply (in this case, the control circuit board 500 includes a self-generated power supply circuit, etc.). Of course, these functions can be both at the same time or only one. For the case where both are present, each mutual inductor 300 has multiple magnetic rings 310 inside, providing sampling data for each function respectively. When there are multiple magnetic rings 310, the magnetic rings 310 are stacked in sequence along the direction of the axis P.

[0076] For the module housing 400, an annular boss 401 is provided on the inner wall of the module housing 400. Here, the annular boss 401 is arranged around the through hole, and the through hole here is a hole for a part of the fourth connector 602 to penetrate and cooperate with the third connector 501. The reason for adopting such an annular design is to improve the stability of the plug-in fitting and to improve certain electrical insulation performance. Here, the annular boss 401 also surrounds the fourth plug. Of course, in addition to this, the annular boss 401 can also be changed to surround the third connector 501, which also has a corresponding effect.

[0077] On all circuit breaker housings 100, first slot portions 160a are provided along the first direction D, and all first slot portions 160a together form a first slot 160, so that the adapter circuit board 600 is partially inserted into the first slot 160. Such a plug-in arrangement will facilitate the installation of the adapter circuit board 600, and also facilitate the matching of the first connector 601 with the second connector. Here, the first slot portion 160a of the circuit breaker module L farthest from the control module Z is a blind slot, and the other first slots 160 are through slots, so that the end of the adapter circuit board 600 farthest from the control module Z can also abut against the blind slot, thereby improving the insulation performance.

[0078] In the third direction H, the transfer circuit board 600 is located above the mutual inductor 300. Such an arrangement enables the first plug connector to be located near the mutual inductor 300, which is conducive to forming a plug-in fit between the two.

[0079] The circuit breaker housing 100 is roughly in the shape of a "convex" character, and includes two shoulder positions, namely, two shoulders of the "convex" character, namely, a first shoulder position Y1 and a second shoulder position.

[0080] Here, the switching circuit board 600 is disposed at the first shoulder position Y1. Specifically, a first receiving groove 170 is disposed at the first shoulder position Y1 of each circuit breaker housing 100, and the first receiving grooves 170 of all circuit breaker housings 100 together form a space for receiving the switching circuit board 600.

[0081] Here, the first receiving groove 170 has an opening, and the first cover 180 is used to close the opening of the first receiving groove 170. Here, the first cover 180 and the circuit breaker housing 100 are in a detachable matching manner, and a plug-in manner is adopted here. A guide rail groove is provided on the circuit breaker housing 100, and the first cover 180 has a guide rib, and the guide rib is inserted along the guide rail groove to complete the plug-in matching. The opening direction of the guide rail groove is also the first direction D. Of course, in addition to the plug-in matching in the first direction D, the plug-in matching in the second direction C or the plug-in matching in the third direction H can also be adopted. Of course, in addition to the plug-in matching, other methods can also be adopted, such as snap connection or screw fastening, as long as the first cover 180 can be detachable and the first receiving groove 170 can be closed after installation. No matter which method is used, such a detachable matching design of the first cover 180 is conducive to the maintenance or installation of the first connector 601 and the second connector.

[0082] As for the module housing 400, it is also formed by assembling two half housings, and of course, a larger number of housings can be used. There is a first notch 402 on the module housing 400, and the position of the first notch 402 here corresponds to the first accommodating groove 170. Through the first notch 402, the interior of the module housing 400 can be observed, specifically, the connection between the transfer circuit board 600 and the control circuit board 500 can be observed. The first cover 180 extends into the module housing 400 to fill the first notch 402. Such a matching design of the first notch 402 and the cover can not only meet the needs of observing the connection between the transfer circuit board 600 and the control circuit board 500 or maintenance after the first cover 180 is removed, but also ensure the overall insulation performance after the first cover 180 is installed.

[0083] 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.

[0084] 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 miniature circuit breaker with a mutual inductor, comprising at least one circuit breaker module, each circuit breaker module comprising a circuit breaker housing, a main line conductor and a mutual inductor, wherein the main line conductor is arranged in the circuit breaker housing, and the mutual inductor is sleeved on the main line conductor; characterized in that: The transformer includes a magnetic ring and a transformer cover accommodating the magnetic ring. The axis of the center hole of the magnetic ring is perpendicular to the first direction, and the first direction is the width direction of the circuit breaker module; the circuit breaker housing is provided with avoidance holes connected to the outside on both side walls in the first direction, and the transformer cover has a penetration portion filling the avoidance hole; the transformer cover and the side walls form an insulating protection structure in the avoidance hole or in the avoidance hole.

2. A miniature circuit breaker with a mutual inductor according to claim 1, characterized in that: A first step is arranged at the avoidance hole, a second step matched with the first step is arranged on the transformer cover, and the first step and the second step together form an insulating protection structure.

3. A miniature circuit breaker with a mutual inductor according to claim 2, characterized in that: The side wall has an inner surface, and the hole wall of the avoidance hole and a part of the inner surface are components of the first step; the penetration portion is located on the side surface of the transformer cover, and the penetration portion and a part of the side surface are components of the second step; Or, the side wall has an inner surface, a positioning groove is arranged on the inner surface, and the avoidance hole is opened at the bottom of the positioning groove; a positioning block is arranged on the transformer cover, the positioning block is at least partially located in the positioning groove, and the penetration portion is arranged on the positioning block; the hole wall of the avoidance hole and the bottom of the positioning groove are components of the first step; the penetration portion and a part of the positioning block are components of the second step.

4. A miniature circuit breaker with a mutual inductor according to claim 1, characterized in that: The side wall has an inner surface, the insulating protection structure includes a first plug-in portion arranged on the hole wall or the inner surface of the avoidance hole, and a second plug-in portion is arranged on the transformer cover. The first plug-in portion and the second plug-in portion are plugged together to form the insulating protection structure.

5. A miniature circuit breaker with a mutual inductor according to claim 1, characterized in that: The side wall has a first outer surface, an opening of the avoidance hole is located on the first outer surface, an elevated portion is provided on the first outer surface, and the elevated portion is located on at least one side of the avoidance hole; the penetration portion has a first end connected to the transformer cover and a second end away from the transformer cover, and the second end is flush with or shorter than the elevated portion.

6. A miniature circuit breaker with a mutual inductor according to claim 5, characterized in that: The raised portion is an annular structure, arranged around the avoidance hole; the number of the circuit breaker modules is at least two, and the circuit breaker modules are assembled in sequence along the first direction; one of the raised portions of the circuit breaker module is aligned with and abutted against one of the raised portions of the adjacent circuit breaker module.

7. A miniature circuit breaker with a mutual inductor according to claim 1, characterized in that: The circuit breaker housing comprises a first half shell and a second half shell. In a first direction, the first half shell is located on one side of the second half shell. The number of avoidance holes is two and they are respectively arranged on the first half shell and the second half shell. Or, the circuit breaker housing comprises a first half shell and a second half shell, in the third direction, the first half shell is located above the second half shell, the avoidance hole is formed by splicing the first half shell and the second half shell, and the third direction is perpendicular to the first direction; Or, the circuit breaker housing comprises a first half shell and a second half shell, the first half shell and the second half shell together form a first terminal cavity, a mutual inductance chamber cavity, an arc extinguishing chamber cavity and a first exhaust channel, the first exhaust channel is connected to the arc extinguishing chamber; in the second direction, the mutual inductance chamber cavity is arranged between the first terminal cavity and the arc extinguishing chamber cavity; in the third direction, the mutual inductance chamber cavity is located above the first exhaust channel; the mutual inductance chamber cavity and the first exhaust channel as well as the mutual inductance chamber cavity and the arc extinguishing chamber cavity are separated by the wall of the circuit breaker housing; the relationship between the first direction, the second direction and the third direction is perpendicular to each other; Or, the side wall has an inner surface, and the avoidance hole has a chamfer or rounded corner at the opening of the inner surface; Or, the size of a single circuit breaker module in the first direction is S, the diameter of the magnetic ring is D, and 0.9S≥D>0.55S; Alternatively, the magnetic ring portion is located in the penetration portion.

8. A miniature circuit breaker with a mutual inductor according to claim 1, characterized in that: The main line conductor includes a terminal plate and a through-going conductor. The through-going conductor and the terminal plate are integrally formed or welded and fixed. The total number of bends of the terminal plate and the through-going conductor is no more than four.

9. A miniature circuit breaker with a mutual inductor according to claim 8, characterized in that: The axis of the center hole of the magnetic ring is parallel to the second direction, the through conductor includes a first section and a second section, the first section and the second section are at the same height in the third direction, the first section and the terminal plate are both straight plates, the first section is used to penetrate the center hole of the magnetic ring, the total number of bends of the terminal plate and the through conductor is no more than two, and the relationship between the first direction, the second direction and the third direction is perpendicular to each other; Or, the axis line of the center hole of the magnetic ring is parallel to the second direction, the through conductor includes a first section and a second section, the first section and the terminal board are at different heights in the third direction, the first section and the terminal board are both straight plates, the first section is used to penetrate the center hole of the magnetic ring, the total number of bends of the terminal board and the through conductor is no more than four, and the relationship between the first direction, the second direction and the third direction is perpendicular to each other; Or, the through conductor includes a first section and a second section, the first section is arranged at an obtuse angle or a right angle with the terminal plate, the first section is used to penetrate the center hole of the magnetic ring, and the total number of bends of the terminal plate and the through conductor is no more than three; Alternatively, the main line conductor also includes a solenoid, one end of the conductor is connected to the terminal board, and the other end is welded to one end of the solenoid.

10. A miniature circuit breaker with a mutual inductor according to claim 1, characterized in that: It also includes a control module, which is assembled on one side of a single-pole circuit breaker module in a first direction. The control module has a control circuit board inside; it also includes a transfer circuit board, which is inserted into all circuit breaker housings, and one end of the transfer circuit board is electrically connected to the control circuit board; the transfer circuit board is provided with a first connector corresponding to the mutual inductor one by one; the mutual inductor is provided with a second connector, which is plug-in-matched with the corresponding first connector, so that the information sampled by the magnetic ring is transmitted to the control circuit board.

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