A miniature residual current circuit breaker

Abstract

The application discloses a small leakage circuit breaker, wherein a first L-pole terminal cavity is arranged in a shell, and a first L-pole wiring terminal is arranged in the first L-pole terminal cavity; an N-pole terminal cavity is arranged in the shell, and an N-pole wiring terminal is arranged in the N-pole terminal cavity; an N-pole flexible wire is arranged, one end of the N-pole flexible wire is connected with the N-pole wiring terminal, and the other end of the N-pole flexible wire is led out from an N-pole outlet hole; in the length direction of the shell, the first L-pole terminal cavity is located on one side of the N-pole terminal cavity; in the height direction of the shell, the N-pole outlet hole is located below the N-pole terminal cavity, the N-pole terminal cavity is lower than the first L-pole terminal cavity, and an overlapping area is formed between the N-pole terminal cavity and the first L-pole terminal cavity; and the application has the characteristics of facilitating user wiring.

Description

Technical Field

[0001] This application relates to the electrical field, specifically to a miniature residual current circuit breaker. Background Technology

[0002] The 18mm wide long residual current circuit breaker is a relatively mature technology. Currently, this type of circuit breaker contains one L pole and one N pole. The N pole adopts a structure in which a flexible wire passes through the same side of the circuit breaker and then exits. Generally, the N pole structure does not have a wiring terminal set inside the circuit breaker. For example, the residual current device disclosed in CN215896276U adopts this structure.

[0003] While using pure flexible wires is relatively low in terms of product cost, it is more troublesome for wiring. Moreover, as industry customers' demands increase, it is necessary to add terminals on at least one side, but this is difficult to achieve given the current structure and internal layout. Summary of the Invention

[0004] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and to provide a miniature residual current circuit breaker.

[0005] This application provides: a miniature residual current circuit breaker, wherein a first L-terminal sub-cavity is provided inside the housing, and a first L-terminal terminal is provided inside the housing; The N-end sub-cavity has an internal N-end terminal; The N-pole flexible wire has one end connected to the N-pole terminal and the other end passing through the N-pole outlet hole. Along the length of the outer casing, the first L-end sub-cavity is located on one side of the N-end sub-cavity; In the height direction of the casing, the N-terminal outlet is located below the N-terminal sub-cavity, the N-terminal sub-cavity is lower than the first L-terminal sub-cavity, and there is an overlapping area between the two.

[0006] In some embodiments of this application, the N-terminal sub-cavity has an N-terminal through hole on a first side in the length direction of the housing, and the first L-terminal sub-cavity has an L-terminal through hole on a first side in the length direction of the housing; the housing has a recessed space on the first side in the length direction, and the N-terminal through hole is located in the recessed space.

[0007] In some embodiments of this application, the first L-pole terminal includes a first terminal plate, which is bent to form a clearance space; an N-pole tool hole is provided on the housing, which communicates with the N-pole terminal cavity; in the height direction of the housing, the portion of the first terminal plate with the clearance space is located directly above the N-pole terminal cavity, and the N-pole tool hole communicates with the clearance space.

[0008] In some embodiments of this application, the housing includes a left half-shell and a right half-shell, and a first flange structure and a second flange structure are provided on the left half-shell or the right half-shell. A portion of the N-pole tool hole is formed on the first flange structure and the second flange structure. In the height direction of the housing, the first flange structure is located above the second flange structure, and there is an installation space between the two. The portion of the first terminal board with clearance space is located within the installation space.

[0009] In some embodiments of this application, the first terminal block includes a U-shaped portion, the hollow portion of which serves as a clearance space; an electromagnetic trip unit and a first flexible connection are also provided inside the housing, one end of the first flexible connection being welded to the U-shaped portion and the other end being welded to the solenoid of the electromagnetic trip unit.

[0010] In some embodiments of this application, in the height direction of the housing, the end of the first flexible connection welded to the solenoid is not lower than the end of the first flexible connection welded to the U-shaped portion.

[0011] In some embodiments of this application, a component space is further provided inside the housing, and a zero-sequence current transformer and a circuit board assembly are provided in the component space; in the length direction of the housing, the N-end sub-cavity is located between the component space and the first L-end sub-cavity; in the height direction of the housing, the component space, the first L-end sub-cavity, and the N-end sub-cavity all have overlapping portions; the first flexible connection and the N-pole flexible wire both pass through the central hole of the zero-sequence current transformer.

[0012] In some embodiments of this application, a leakage current trip unit is also provided in the component space; in the height direction of the housing, the leakage current trip unit is located above the zero-sequence current transformer and the circuit board assembly; in the length direction of the housing, the leakage current trip unit is located on one side of the electromagnetic trip unit.

[0013] In some embodiments of this application, the leakage current trip device has a leakage current push rod, and the electromagnetic trip device has an electromagnetic push rod; the axis of the leakage current push rod coincides with the axis of the electromagnetic push rod; when the leakage current trip device is actuated, the leakage current push rod pushes the electromagnetic push rod to move, so as to realize the leakage current tripping movement.

[0014] In some embodiments of this application, the width of the circuit breaker is 17.5mm-18.5mm.

[0015] The advantages of this application compared to the prior art are: The addition of an N-terminal cavity and N-pole terminal facilitates wiring for users. Furthermore, the optimized internal space layout of the casing allows for a more compact internal structure that still meets user needs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 An exploded view of a miniature residual current circuit breaker according to an embodiment of this application is shown; Figure 2 A schematic diagram of the left half of the shell according to an embodiment of this application is shown; Figure 3 An internal schematic diagram of a miniature residual current circuit breaker according to an embodiment of this application is shown; Figure 4 A cross-sectional view of a miniature leakage current trip unit and an electromagnetic trip unit according to an embodiment of this application is shown. Detailed Implementation

[0018] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0019] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0021] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "electrical connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed electrical connection, a detachable electrical connection, or an integral connection; they can refer to a mechanical-electrical connection or an electro-electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. Example

[0023] like Figures 1-4 As shown, an embodiment of this application is a miniature residual current circuit breaker, specifically an 18mm wide RCBO circuit breaker.

[0024] The circuit breaker includes a housing, and inside the housing are an L-pole structure and an N-pole structure.

[0025] The outer shell includes a left half shell 110 and a right half shell 120, which are connected by snap-fit ​​and riveting.

[0026] The N-pole structure includes an N-pole terminal 200 and an N-pole flexible wire 210.

[0027] The L-pole structure includes a first L-pole terminal block 300, an electromagnetic trip unit 500, a moving contact, a stationary contact, a bimetallic strip, a second L-pole terminal block, etc. Since the electromagnetic trip unit 500, the moving contact, the stationary contact, the bimetallic strip, and the second L-pole terminal block adopt existing structures and are not related to the inventive point of this application, these structures will not be described in detail here.

[0028] Inside the housing, there is a first L-end sub-cavity 100a, an N-end sub-cavity 100b, and an N-end outlet hole 100c.

[0029] Taking the length direction L of the outer shell as an example, the first L-end sub-cavity 100a is located on one side of the N-end sub-cavity 100b.

[0030] Taking the height direction H of the casing as an example, the N-terminal outlet hole 100c is located below the N-terminal sub-cavity 100b. The N-terminal sub-cavity 100b is lower than the first L-terminal sub-cavity 100a, and there is an overlapping area between the two.

[0031] A portion of the first L pole terminal 300 is disposed within the first L pole sub-cavity 100a.

[0032] An N-pole terminal 200 is provided inside the N-pole sub-cavity 100b. One end of the N-pole flexible wire 210 is soldered to the N-pole terminal 200 (specifically, the terminal plate of the N-pole terminal 200), and the other end passes through the N-pole outlet hole 100c to the outside of the housing.

[0033] With this structure, the relative positions of the N-end sub-cavity 100b and the first L-end sub-cavity 100a are reasonably arranged, enabling the N-pole terminal 200 to be installed inside the circuit breaker, and the structure is very compact.

[0034] The outer casing has a first side L1 and a second side in the length direction L. The first side L1 is the side close to the first L-end sub-cavity 100a and the N-end sub-cavity 100b, and the second side is the side close to the first L-end sub-cavity 100a.

[0035] The N-end sub-cavity 100b has an N-pole through-hole 100b1 on its first side L1 along the length L of the housing, and the first L-end sub-cavity 100a has an L-pole through-hole 100a1 on its first side L1 along the length L of the housing. These through-holes facilitate the user in threading the load line conductors through the through-holes into the corresponding terminals, so that the circuit breaker can be connected to the load line.

[0036] Here, the outer casing has a recessed space 100d on the first side L1 along the length direction L, and the N-pole through hole 100b1 is located in the recessed space 100d. The recessed space 100d is actually a stepped structure set on the outer casing. The N-pole sub-cavity 100b is located in the lower region of the step, while the first L-pole sub-cavity 100a is located in the higher region of the step.

[0037] This structure makes the casing more compact and also allows this part of the circuit breaker to avoid other objects in the installation environment.

[0038] The first L-pole terminal 300 includes a first terminal plate 310. A portion of the first terminal plate 310 extends into the wiring frame within the first L-pole terminal cavity 100a, and the other portion is bent to form a clearance space 320a.

[0039] The housing has an L-pole tool hole 100a2 and an N-pole tool hole 100b2. In the height direction H of the housing, the L-pole tool hole 100a2 is located above and communicates with the first L-pole sub-cavity 100a, and the N-pole tool hole 100b2 is located above and communicates with the N-pole sub-cavity 100b. These tool holes allow the user to insert tools to tighten the terminal screws. Here, the portion of the first terminal plate 310 with a clearance space 320a is located directly above the N-pole sub-cavity 100b, and the N-pole tool hole 100b2 communicates with the clearance space 320a.

[0040] This clearance space 320a design makes the overall structure more compact and also makes it easier for users to insert tools through the N-pole tool hole 100b2 and clearance space 320a into the N-pole terminal cavity 100b to complete the wiring.

[0041] Here, a first flange structure 110a and a second flange structure 110b are formed on the left half-shell 110. A portion of the N-pole tool hole 100b2 is formed on the first flange structure 110a and the second flange structure 110b, and another portion of the N-pole tool hole 100b2 is formed on the right half-shell 120. In the height direction H of the shell, the first flange structure 110a is located above the second flange structure 110b, and there is a mounting space 110c between them. This portion of the first terminal plate 310 with the clearance space 320a is located within the mounting space 110c.

[0042] The design of the mounting space 110c, the first flange structure 110a, and the second flange structure 110b facilitates the installation of this part of the first terminal board 310. Of course, in addition, the left and right halves of the shell 120 can also be interchanged.

[0043] The portion of the first terminal plate 310 that forms the clearance space 320a is a U-shaped portion, meaning that the hollow part of the U-shaped portion is the clearance space 320a. In addition to forming the clearance space 320a, the U-shaped portion is also the part used for welding with the first flexible connection 330, the other end of which is welded to the solenoid 510 of the electromagnetic trip unit 500.

[0044] This U-shaped structure is simple to form and relatively easy to create the clearance space 320a.

[0045] In the height direction H of the outer casing, the end of the first flexible connection 330 welded to the solenoid 510 is not lower than the end of the first flexible connection 330 welded to the U-shaped part.

[0046] This design avoids an excessively long or tight first soft connection 330, making the internal structure of the product more compact.

[0047] Here, there is also a component space 100e inside the housing. This component space 100e is used to install the residual current tripping assembly, which includes a zero-sequence current transformer 410, a circuit board assembly 420, and a residual current tripping device 430.

[0048] Along the length L of the housing, the N-end sub-cavity 100b is located between the component space 100e and the first L-end sub-cavity 100a. Along the height H of the housing, the component space 100e overlaps with both the first L-end sub-cavity 100a and the N-end sub-cavity 100b.

[0049] The first flexible connection 330 and the N-pole flexible wire 210 both pass through the center hole of the zero-sequence current transformer 410.

[0050] This 100e component space design allows the leakage current tripping components to be concentrated in one area, making the internal structure of the product more compact.

[0051] Within the component space 100e, and viewed from the height direction H of the housing, the residual current device 430 is located above the zero-sequence current transformer 410 and the circuit board assembly 420. Viewed from the length direction L of the housing, the residual current device 430 is located to one side of the electromagnetic trip unit 500.

[0052] This structural design facilitates the connection between the leakage current trip unit 430 and the electromagnetic trip unit 500.

[0053] Here, the residual current circuit breaker 430 is actuated by pushing the electromagnetic trip unit 500.

[0054] Specifically, the residual current device 430 has a residual current push rod 430a, and the electromagnetic trip device 500 has an electromagnetic push rod 500a. The axis of the residual current push rod 430a coincides with the axis of the electromagnetic push rod 500a.

[0055] When a leakage current exists in the load line, the leakage current trip unit 430 is activated. The leakage current push rod 430a pushes the electromagnetic push rod 500a to move, causing the electromagnetic push rod 500a to strike the latch of the operating mechanism, thereby unlocking the operating mechanism and completing the tripping operation (also called leakage current tripping movement). The specific structure of the operating mechanism and the construction of the electromagnetic trip unit 500 are common knowledge and will not be described in detail here. The leakage current trip unit 430 is essentially an electromagnet, which also includes a magnetic yoke and a leakage current coil. By energizing the leakage current coil, a magnetic field is formed, and the leakage current push rod 430a is attracted by the magnetic force and thus activated.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A miniature residual current circuit breaker, characterized in that: The outer casing contains, The first L-end sub-cavity is provided with the first L-end terminal block inside; The N-end sub-cavity has an internal N-end terminal; The N-pole flexible wire has one end connected to the N-pole terminal and the other end passing through the N-pole outlet hole. Along the length of the outer casing, the first L-end sub-cavity is located on one side of the N-end sub-cavity; In the height direction of the casing, the N-terminal outlet is located below the N-terminal sub-cavity, the N-terminal sub-cavity is lower than the first L-terminal sub-cavity, and there is an overlapping area between the two.

2. The miniature residual current circuit breaker according to claim 1, characterized in that: The N-end sub-cavity has an N-pole through hole on the first side of the outer casing along the length direction, and the first L-end sub-cavity has an L-pole through hole on the first side of the outer casing along the length direction; the outer casing has a recessed space on the first side along the length direction, and the N-pole through hole is located in the recessed space.

3. A miniature residual current circuit breaker according to claim 1, characterized in that: The first L-pole terminal includes a first terminal plate, which is bent to form a clearance space; an N-pole tool hole is provided on the housing, which communicates with the N-pole terminal cavity; in the height direction of the housing, the portion of the first terminal plate with the clearance space is located directly above the N-pole terminal cavity, and the N-pole tool hole communicates with the clearance space.

4. A miniature residual current circuit breaker according to claim 3, characterized in that: The housing includes a left half-shell and a right half-shell. A first flange structure and a second flange structure are provided on the left half-shell or the right half-shell. A portion of the N-pole tool hole is formed on the first flange structure and the second flange structure. In the height direction of the housing, the first flange structure is located above the second flange structure, and there is an installation space between the two. The portion of the first terminal block with clearance space is located within the installation space.

5. A miniature residual current circuit breaker according to claim 3, characterized in that: The first terminal block includes a U-shaped section, the hollow part of which serves as a clearance space; an electromagnetic trip unit and a first flexible connection are also provided inside the housing, one end of which is welded to the U-shaped section and the other end is welded to the solenoid of the electromagnetic trip unit.

6. A miniature residual current circuit breaker according to claim 5, characterized in that: In the height direction of the outer casing, the end of the first flexible connection welded to the solenoid is not lower than the end of the first flexible connection welded to the U-shaped part.

7. A miniature residual current circuit breaker according to claim 6, characterized in that: The housing also includes a component space containing a zero-sequence current transformer and a circuit board assembly. Along the length of the housing, the N-end sub-cavity is located between the component space and the first L-end sub-cavity. Along the height of the housing, the component space overlaps with both the first L-end sub-cavity and the N-end sub-cavity. The first flexible connection and the N-pole flexible wire both pass through the central hole of the zero-sequence current transformer.

8. A miniature residual current circuit breaker according to claim 7, characterized in that: The component space is also equipped with a residual current device (RCD); in the height direction of the housing, the RCD is located above the zero-sequence current transformer and circuit board assembly; in the length direction of the housing, the RCD is located to one side of the electromagnetic trip unit.

9. A miniature residual current circuit breaker according to claim 8, characterized in that: The residual current device (RCD) has a residual current push rod, and the electromagnetic trip device has an electromagnetic push rod; the axis of the residual current push rod coincides with the axis of the electromagnetic push rod; when the RCD is actuated, the residual current push rod pushes the electromagnetic push rod to move, so as to realize the residual current tripping movement.

10. A miniature residual current circuit breaker according to claim 1, characterized in that: The width of the circuit breaker is 17.5mm-18.5mm.

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