A small circuit breaker with firm wiring

Abstract

The utility model belongs to the field of circuit breaker technology, especially relate to a small circuit breaker of firm wiring, including circuit breaker casing and wiring assembly, wiring assembly includes: wiring frame is provided with first wiring boss, is provided with two elastic pressure shell components on wiring frame, wiring screw is used for controlling the movement of wiring frame along Z direction, wiring board includes the connecting portion, wiring portion and pressure shell portion of integral structure, wiring portion is provided with second wiring boss, and pressure shell portion is used for abutting the insulating plastic shell of electric wire, and elastic pressure shell component includes fixed part, curved deformation part and pressure contact arc piece, curved deformation part is connected on fixed part, and pressure contact arc piece is connected on the insulating plastic shell of electric wire for abutting along the radial direction, the utility model has the advantages that elastic pressure shell component utilizes the elastic deformation of extrusion of curved deformation part, and pushes the pressure contact arc piece abutting the insulating plastic shell of electric wire, then cooperates the pressure shell portion of wiring board to realize the clamping fixing of electric wire plastic shell, prevents the electric wire from getting out.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, and in particular relates to a small circuit breaker with a secure wiring connection. Background Technology

[0002] Miniature circuit breakers (MCBs) are fundamental electrical components in low-voltage power distribution systems, enabling circuit switching control, overload protection, and short-circuit protection. They are widely used in various power distribution scenarios, including civil buildings and industrial and commercial power distribution. The wiring structure is a crucial component of a circuit breaker, used to connect external wires to the internal conductive circuit. The robustness of this wiring directly affects the conductive contact performance and the safety of equipment operation.

[0003] The wiring structure of existing miniature circuit breakers mostly adopts a single clamping method with screw-driven pressure plates, which only clamps and fixes the metal core of the wire, lacking effective clamping and limiting of the wire's insulation shell. When the wire is pulled by external force, the tension acts directly on the clamping part of the metal core, which can easily cause the core to shift or loosen, leading to increased contact resistance, contact overheating, and in severe cases, even electrical faults such as circuit breaking and arcing. Utility Model Content

[0004] The purpose of this utility model is to provide a small circuit breaker with robust wiring to address the aforementioned technical problems.

[0005] In view of this, the present invention provides a miniature circuit breaker with secure wiring, comprising a circuit breaker housing and a wiring assembly. The circuit breaker housing is provided with a wiring chamber and a wiring port, and the wiring assembly includes: The wiring frame is movable in the wiring chamber along the Z direction and connected to the wiring port. A first wiring boss is provided on the inner wall of one end of the wiring frame along the Z direction. The first wiring boss is used to abut against the metal core of the wire. Two elastic pressure shell members are provided on the end of the wiring frame along the Y direction near the wiring port, and the two elastic pressure shell members are respectively located on both sides of the wiring frame along the X direction. The wiring screw is threaded onto the other end of the wiring frame along the Z direction and is used to control the movement of the wiring frame along the Z direction. The terminal block includes an integral connecting part, a wiring part, and a pressure shell part. The connecting part is installed inside the circuit breaker housing. The wiring part extends into the wiring frame along the Y direction, and a second wiring boss is provided on the end face of the wiring part along the Z direction near the first wiring boss. The second wiring boss is used to abut against the metal core of the wire. The pressure shell part has an arc-shaped structure and is provided on the end of the wiring part along the Y direction near the wiring port, and is used to abut against the insulating plastic shell of the wire in the radial direction. The elastic pressure shell component includes a fixing part, a bending deformation part, and a crimping arc plate. The fixing part is connected to the terminal frame, one end of the bending deformation part is connected to the fixing part, and the crimping arc plate is connected to the other end of the bending deformation part. It is used to abut the wire in the radial direction as an insulating plastic shell.

[0006] Furthermore, a positioning step is formed between the housing part and the wiring part, and the positioning step is used to abut the insulating plastic shell of the wire along the Y direction.

[0007] Furthermore, the crimping arc sheet is provided with several first crimping protrusions.

[0008] Furthermore, the pressure shell portion is provided with several second pressing protrusions.

[0009] Furthermore, the first wiring boss also includes a first crimping protrusion arranged along the X direction, and there are several first crimping protrusions arranged in a linear array along the Y direction.

[0010] Furthermore, the second wiring boss also includes a second crimping protrusion arranged along the X direction. There are several second crimping protrusions, which are arranged in a linear array along the Y direction.

[0011] The beneficial effects of this utility model are: The first and second wiring bosses are used to clamp the metal core of the wire to achieve wire connection; the two elastic pressure shell components use the elastic deformation caused by the compression of the bending deformation part to push the crimping arc plate to abut against the insulating plastic shell of the wire in the radial direction, and then cooperate with the pressure shell part of the terminal plate to clamp and fix the plastic shell of the wire, effectively preventing the wire from coming out of the terminal. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the wiring assembly in this utility model; Figure 3 This is a structural cross-sectional view of the wiring assembly in this utility model; The markings in the diagram are as follows: 1. Circuit breaker housing; 11. Terminal block; 2. Terminal frame; 21. First terminal boss; 22. First crimping protrusion; 3. Elastic pressure shell component; 31. Fixing part; 32. Bending deformation part; 33. Crimping arc plate; 34. First crimping protrusion; 4. Terminal screw; 5. Terminal block; 51. Connecting part; 52. Terminal part; 53. Pressure shell part; 54. Second terminal boss; 55. Positioning step; 56. Second crimping protrusion; 57. Second crimping protrusion. Detailed Implementation

[0013] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0014] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0015] Example 1:

[0016] This embodiment provides a robustly wired miniature circuit breaker, including a circuit breaker housing 1 and a wiring assembly. The circuit breaker housing 1 is provided with a wiring chamber and a wiring port 11. The wiring assembly includes: The wiring frame 2 is movable in the wiring chamber along the Z direction and is connected to the wiring port 11. A first wiring boss 21 is provided on the inner wall of one end of the wiring frame 2 along the Z direction. The first wiring boss 21 is used to abut the metal core of the wire. Two elastic pressure shell members 3 are provided on the end of the wiring frame 2 near the wiring port 11 along the Y direction. The two elastic pressure shell members 3 are located on both sides of the wiring frame 2 along the X direction. The wiring screw 4 is threaded onto the other end of the wiring frame 2 along the Z direction, and is used to control the movement of the wiring frame 2 along the Z direction; The terminal block 5 includes an integrally structured connecting part 51, a wiring part 52, and a pressure shell part 53. The connecting part 51 is installed inside the circuit breaker housing 1. The wiring part 52 extends into the wiring frame 2 along the Y direction, and a second wiring boss 54 is provided on the end face of the wiring part 52 near the first wiring boss 21 along the Z direction. The second wiring boss 54 is used to abut against the metal core of the wire. The pressure shell part 53 has an arc-shaped structure and is provided on the end of the wiring part 52 near the wiring port 11 along the Y direction, and is used to abut against the insulating plastic shell of the wire in the radial direction. The elastic pressure shell component 3 includes a fixing part 31, a bending deformation part 32, and a crimping arc plate 33. The fixing part 31 is connected to the wiring frame 2, one end of the bending deformation part 32 is connected to the fixing part 31, and the crimping arc plate 33 is connected to the other end of the bending deformation part 32, which is used to abut the wire in the radial direction.

[0017] In this technical solution, the miniature circuit breaker is used in low-voltage power distribution lines to realize circuit switching control and overload and short-circuit protection. It mainly consists of a circuit breaker housing 1 and a wiring assembly. The wiring assembly is located at the wiring part 52 of the circuit breaker housing 1, which can simultaneously form graded clamping and fixing of the metal core of the wire and the insulating plastic shell, improve the firmness of the wire connection, and prevent loosening due to external pulling.

[0018] The circuit breaker housing 1 is integrally formed from an insulating rigid material. The housing houses the circuit breaker's breaking operation mechanism and conductive circuit structure. Its internal structure is existing technology and will not be described in detail. A wiring chamber and a wiring port 11 are provided at the end of the housing. The wiring chamber is a hollow internal space for installing wiring components. The wiring port 11 is located on the outer wall of the housing and communicates with the interior of the wiring chamber, serving as a channel for external wires to be inserted into the housing. The central axis of the wiring port 11 is collinear with the central axis of the wiring frame 2.

[0019] The wiring frame 2 is a hollow frame structure made of conductive material, which can be movably installed inside the wiring chamber along the Z direction. The internal cavity of the frame is connected to the wiring port 11, and the end of the power supply line extends into it. A first wiring boss 21 is provided on the inner wall of the wiring frame 2 along the Z direction. The first wiring boss 21 protrudes into the frame and is used to abut and press the metal core of the wire.

[0020] Furthermore, the first wiring boss 21 also includes a first crimping protrusion 22 arranged along the X direction. There are several first crimping protrusions 22, arranged in a linear array along the Y direction. The cross-section of the protrusion is a raised ridge shape, used to embed into the surface of the wire core when clamping the wire core, increasing the contact friction and contact area. Two elastic clamping shell members 3 are provided on one end of the wiring frame 2 near the wiring port 11 along the wire insertion direction. The two elastic clamping shell members 3 are located on both sides of the wiring frame 2 along the X direction, symmetrically distributed, and used to radially clamp the insulating plastic shell of the wire from both sides. The elastic clamping shell component 3 is a component with elastic deformation capability. Each elastic clamping shell component 3 is integrally formed by a fixing part 31, a bending deformation part 32, and a crimping arc plate 33. The fixing part 31 is a flat plate structure, which is fixedly connected to the end of the wiring frame 2 near the wiring port 11, serving as the fixed root of the entire component. The bending deformation part 32 is a bent elastic arm structure, one end of which is connected to the end of the fixing part 31 and bends and extends towards the central axis of the wiring frame 2, which can generate elastic deformation in the radial direction to provide elastic clamping force for clamping the wire. The crimping arc plate 33 is an arc-shaped plate structure, which is connected to the free end of the bending deformation part 32. The arc-shaped concave surface faces the central axis of the wire and is adapted to the outer peripheral surface of the wire insulation shell, used to crimp the insulation shell of the wire radially from the side.

[0021] The wiring screw 4 is a threaded fastener made of conductive metal. It is threaded along the Z direction and connected to the side wall of the wiring frame 2 opposite to the first wiring boss 21. The shank of the screw passes through the side wall of the wiring frame 2. When the wiring screw 4 is rotated, the wiring frame 2 can be driven to move back and forth along the Z direction through the thread transmission, thereby adjusting the clamping distance inside the wiring frame 2 and providing driving force for clamping and loosening the wire.

[0022] The terminal block 5 is a one-piece conductive material component, fixedly installed inside the circuit breaker housing 1, and consists of three parts: a connecting part 51, a wiring part 52, and a clamping part 53. The connecting part 51 is a plate-shaped structure, fixedly connected to the internal conductive structure of the circuit breaker housing 1 to achieve current conduction. The wiring part 52 is a straight plate-shaped structure, extending into the internal cavity of the terminal frame 2 along the wire insertion direction. A second wiring boss 54 is provided on the Z-direction end face of the wiring part 52 facing the first wiring boss 21. The second wiring boss 54 is arranged opposite to the first wiring boss 21 along the Z-direction and is used to cooperate with the first wiring boss 21 to clamp the metal core of the wire. The clamping part 53 is an arc-shaped plate-shaped structure, integrally set at the end of the wiring part 52 near the wiring port 11. The arc-shaped concave surface faces the radial direction of the wire and is used to radially abut against the insulating plastic shell of the wire.

[0023] Furthermore, the second wiring boss 54 also includes a second crimping protrusion 57 arranged along the X direction. There are several second crimping protrusions 57, which are arranged in a linear array along the Y direction. The positions of the second crimping protrusions 57 correspond one-to-one with the positions of the first crimping protrusions 22. When clamped, the two sets of protrusions interlock and engage with each other, further improving the clamping firmness of the wire core.

[0024] When wiring this miniature circuit breaker, firstly, the insulating plastic shell at the end of the external wire is stripped to expose the metal core of a set length. Then, the wire is inserted into the circuit breaker housing 1 through the wiring port 11, so that the metal core of the wire extends into the gap between the first wiring boss 21 and the second wiring boss 54. Next, the wiring screw 4 is tightened, and the wiring frame 2 is moved towards the wiring plate 5 in the Z direction through the threaded transmission. The first wiring boss 21 gradually approaches the second wiring boss 54, and the gap between the two decreases, clamping the metal core in the middle. During the clamping process, the first crimping protrusion 22 and the second crimping protrusion 57 are respectively embedded into the surface of the metal core from both sides, forming an interlaced crimping pattern, increasing the contact pressure and axial friction of the core, and preventing the core from being pulled out.

[0025] At the same time, the two elastic pressure shell components 3 move synchronously with the wiring frame 2, and the pressing arc plates 33 on both sides contact the outer walls of the left and right sides of the wire insulation plastic shell respectively. The bending deformation part 32 is squeezed and undergoes elastic deformation, generating an inward elastic clamping force. With the abutment of the lower pressure shell part 53, the insulation plastic shell of the wire is radially clamped from multiple directions, effectively preventing the wire from coming off the circuit breaker.

[0026] When it is necessary to disassemble the wire, loosen the terminal screw 4 in the opposite direction, move the terminal frame 2 away from the terminal board 5, gradually release the clamping force of the wire core, and restore the elastic deformation of the bending deformation part 32 at the same time. The crimping arc plate 33 loosens the wire plastic shell, and the wire can be pulled out from the terminal 11.

[0027] Example 2:

[0028] This embodiment provides a robustly wired miniature circuit breaker, which, in addition to the technical solutions described in the above embodiments, also has the following technical features.

[0029] Furthermore, a positioning step 55 is formed between the housing portion 53 and the wiring portion 52, the positioning step 55 being used to abut the insulating plastic shell of the wire along the Y direction.

[0030] A positioning step 55 is formed at the junction of the pressure shell portion 53 and the wiring portion 52. This structural design allows the end of the insulating plastic shell to abut against the positioning step 55 when the wire is inserted, limiting the insertion depth and ensuring that the metal wire core is precisely within the clamping area of ​​the two wiring bosses. This effectively ensures that the metal wire core completely falls between the first wiring boss 21 and the second wiring boss 54, improving wiring stability.

[0031] Example 3:

[0032] This embodiment provides a robustly wired miniature circuit breaker, which, in addition to the technical solutions described in the above embodiments, also has the following technical features.

[0033] Furthermore, the pressing arc plate 33 is provided with a plurality of first pressing protrusions 34. A plurality of first pressing protrusions 34 are provided on the inner arc surface of the pressing arc plate 33, and the protrusions are distributed on the arc surface to press into the surface of the plastic shell and improve the anti-slip performance of the side clamping.

[0034] Furthermore, the pressing shell portion 53 is provided with a plurality of second pressing protrusions 56. The arc-shaped inner surface of the pressing shell portion 53 is provided with a plurality of second pressing protrusions 56, which are distributed in a dot-like or strip-like manner, and are used to press into the surface of the plastic shell to increase the frictional resistance of the plastic shell portion.

[0035] Through the above structural design, the first pressing protrusion 34 on the pressing arc plate 33 and the second pressing protrusion 56 on the pressing shell part 53 are pressed into the surface of the plastic shell, increasing the frictional resistance of the plastic shell part, effectively restricting the circumferential rotation of the wire, and improving the anti-loosening effect.

[0036] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A miniature circuit breaker with secure wiring, comprising a circuit breaker housing (1) and a wiring assembly, wherein the circuit breaker housing (1) is provided with a wiring chamber and a wiring port (11), characterized in that, The wiring assembly includes: The wiring frame (2) is movable in the wiring chamber along the Z direction and is connected to the wiring port (11). A first wiring boss (21) is provided on the inner wall of one end of the wiring frame (2) along the Z direction. The first wiring boss (21) is used to abut the metal core of the wire. Two elastic pressure shell members (3) are provided on the end of the wiring frame (2) near the wiring port (11) along the Y direction. The two elastic pressure shell members (3) are located on both sides of the wiring frame (2) along the X direction. A wiring screw (4) is threaded onto the other end of the wiring frame (2) along the Z direction, and is used to control the movement of the wiring frame (2) along the Z direction; The terminal block (5) includes an integral connecting part (51), a wiring part (52) and a pressure shell part (53). The connecting part (51) is installed inside the circuit breaker housing (1). The wiring part (52) extends into the wiring frame (2) along the Y direction. A second wiring boss (54) is provided on the end face of the wiring part (52) near the first wiring boss (21) along the Z direction. The second wiring boss (54) is used to abut against the metal core of the wire. The pressure shell part (53) is an arc-shaped structure and is provided on the end of the wiring part (52) near the wiring port (11) along the Y direction. It is used to abut against the insulating plastic shell of the wire in the radial direction. The elastic pressure shell component (3) includes a fixing part (31), a bending deformation part (32), and a pressing arc plate (33). The fixing part (31) is connected to the wiring frame (2). One end of the bending deformation part (32) is connected to the fixing part (31), and the pressing arc plate (33) is connected to the other end of the bending deformation part (32) for radially abutting the insulating plastic shell of the wire.

2. The miniature circuit breaker with secure wiring according to claim 1, characterized in that, A positioning step (55) is formed between the pressure shell part (53) and the wiring part (52), and the positioning step (55) is used to abut the insulating plastic shell of the wire along the Y direction.

3. A miniature circuit breaker with secure wiring according to claim 1, characterized in that, The crimping arc plate (33) is provided with a plurality of first crimping protrusions (34).

4. A miniature circuit breaker with secure wiring according to claim 1, characterized in that, The pressure shell part (53) is provided with a plurality of second pressing protrusions (56).

5. A miniature circuit breaker with secure wiring according to claim 1, characterized in that, The first wiring boss (21) also includes a first crimping protrusion (22) arranged along the X direction. There are several first crimping protrusions (22), and they are arranged in a linear array along the Y direction.

6. A miniature circuit breaker with secure wiring according to claim 1, characterized in that, The second wiring boss (54) also includes a second crimping protrusion (57) arranged along the X direction. There are several second crimping protrusions (57), and they are arranged in a linear array along the Y direction.

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