A wiring and venting structure for a residual current circuit breaker

Abstract

This utility model discloses a wiring and venting structure for a residual current circuit breaker (RCCB), including a circuit breaker housing, a residual current trip conductor, a magnetic ring conductor, and an arc-extinguishing chamber. The base, middle seat, and top cover of the housing cooperate to form L-pole and N-pole bases. The residual current trip conductor and the arc-extinguishing chamber are located at the L-pole, and the magnetic ring conductor is located at the N-pole. The arc-extinguishing chamber has a first and a second vent distributed vertically. The L-pole has a spaced residual current trip conductor receiving area and two arc-extinguishing venting channels, with the bottom surface corresponding to the two venting ports. The two venting channels are connected through a vent hole to ensure smooth discharge of high-temperature gas. The N-pole forms a magnetic ring conductor receiving area and an arc-generating area, with the magnetic ring area and the arc area separated. A third venting port at the bottom connects to the arc area. This design facilitates arc ignition and venting, and also ensures a reasonable conductor arrangement, avoiding interference from electric arcs.

Description

Technical Field

[0001] This utility model relates to the field of residual current circuit breaker technology, and in particular to a wiring and venting structure for a residual current circuit breaker. Background Technology

[0002] The arc ignition, high-temperature gas venting, and conductor arrangement are crucial in residual current circuit breakers (RCCBs). In existing 18mm wide 1P+N RCCBs, even with full functionality, the internal components are numerous and the structure is compact. Under this design, if arc ignition and high-temperature gas venting are not timely, it will severely affect the product's performance during operation, and may even lead to the product exploding. Multiple conductors, such as power supply conductors, residual current trip conductors, and magnetic ring conductors, are laid out inside the RCCB. If the conductor arrangement is improper, the relatively thin residual current trip conductors and magnetic ring conductors, if not properly isolated and protected, can easily be damaged by contact with or close proximity to arcs or high-temperature gases. Therefore, a circuit breaker structure that facilitates smooth arc ignition and high-temperature gas venting, and has an appropriate conductor arrangement, is needed. Utility Model Content

[0003] The purpose of this utility model is to overcome the defects of the prior art by providing a wiring and venting structure for a residual current circuit breaker, which facilitates arc ignition, smooth discharge of high-temperature gas, and proper wire arrangement.

[0004] The technical solution of this utility model is as follows: A wiring and venting structure for a residual current circuit breaker (RCCB), comprising a circuit breaker housing, a residual current trip conductor, a magnetic ring conductor, and an arc-extinguishing chamber. The arc-extinguishing chamber includes multiple parallel metal arc-extinguishing grids. The circuit breaker housing includes a base, a middle base, and a top cover. The middle base, together with the top cover and the base, forms an L-pole base and an N-pole base, respectively. The residual current trip conductor and the arc-extinguishing chamber are located in the L-pole base, and the magnetic ring conductor is located in the N-pole base. The arc-extinguishing chamber is provided with a first air outlet and a second air outlet distributed vertically. The L-electrode base has a leakage current trip unit wire receiving area, a first arc-running exhaust channel and a second arc-running exhaust channel formed inside. The bottom surface of the L-electrode base is provided with a first exhaust port and a second exhaust port. The first air outlet and the first exhaust port are connected through the first arc-running exhaust channel. The second air outlet and the second exhaust port are connected through the second arc-running exhaust channel. The first arc-running exhaust channel and the second arc-running exhaust channel are also connected through a vent hole. The leakage current trip unit wire is located in the leakage current trip unit wire receiving area. The N-pole substrate has a magnetic ring wire receiving area and an arc generating area formed inside it. The magnetic ring wire receiving area and the arc generating area are spaced apart from each other. A third vent is provided on the bottom surface of the N-pole substrate. The arc generating area is connected to the third vent. The magnetic ring wire is located in the magnetic ring wire receiving area.

[0005] By adopting the above technical solution, this utility model can effectively divert and discharge the high-temperature, high-pressure gas after passing through the arc-extinguishing chamber through two arc-running exhaust channels. Each of the two exhaust channels is equipped with a corresponding exhaust port. When there is a pressure difference between the two spaces, under the influence of the pressure difference, the high-temperature gas in the higher-pressure exhaust channel flows through the vent to the lower-pressure exhaust channel for buffered convection. This prevents the product casing from cracking and ensures that the high-temperature gas is promptly discharged. This achieves effective gas discharge from the arc-extinguishing chamber, avoiding the problem of circuit breaker performance degradation due to gas accumulation.

[0006] In addition, the setting of the residual current device (RCD) wire receiving area and the magnetic ring wire receiving area forms multiple independent spaces. The RCD wire receiving area can accommodate excessively long wires, so that each wire is placed in a reasonable and appropriate position. It also prevents electric arcs and high-temperature gases from penetrating and damaging the wires, optimizes the wiring structure, and improves the stability and safety of the circuit breaker.

[0007] A further feature of this invention is as follows: a first arc-blocking plate and a second arc-blocking plate are respectively provided on the opposite sides of the middle seat and the upper cover, and the first and second arc-blocking plates abut against each other to form an isolation structure between the first arc-running exhaust channel and the second arc-running exhaust channel; arc-blocking plate A and arc-blocking plate B are also respectively provided on the opposite sides of the middle seat and the upper cover, and arc-blocking plates A and B abut against each other to form an isolation structure between the leakage current trip device wire receiving area and the first arc-running exhaust channel; the vent is opened on the first arc-blocking plate or the second arc-blocking plate, and the first exhaust port and the second exhaust port are located on the bottom surface of the middle seat.

[0008] With the further configuration described above, the first and second arc-isolating plates effectively separate the first and second arc-exhausting channels, preventing the disorderly flow of high-temperature, high-pressure gas between them and further enhancing the gas diversion and discharge effect. Simultaneously, the combined use of arc-isolating plates A and B effectively isolates the leakage current trip unit conductor housing area from the first arc-exhausting channel, protecting the conductor from damage by electric arcs and high-temperature gas. The reasonable placement of the vent holes ensures that when there is a pressure difference between the two arc-exhausting channels, high-temperature gas can flow smoothly from the higher-pressure channel to the lower-pressure channel, achieving effective buffering convection. This design not only improves the safety and stability of the circuit breaker but also further optimizes its overall performance.

[0009] A further feature of this invention is that a partition is provided between the lower part of the middle seat and the base, which separates the magnetic ring wire receiving area from the arc generating area.

[0010] With the aforementioned further design, the partition cleverly divides the magnetic ring conductor receiving area and the arc generation area, effectively isolating areas with different functions. The magnetic ring conductor receiving area is specifically designed to accommodate the magnetic ring conductor, ensuring the safety and stability of the conductor and avoiding potential damage caused by factors such as electric arcs.

[0011] A further feature of this invention is that the upper end of the partition member corresponding to the base is provided with a supporting boss, the inner surface of the base is provided with a limiting platform, the supporting boss abuts against the inner surface of the base, the limiting platform abuts against the plate surface of the partition member, and the lower end of the partition member abuts against the lower bottom wall of the base, so as to enclose the magnetic ring wire receiving area.

[0012] The further design, including the supporting boss and limiting platform, enhances the stability and robustness of the connection between the partition and the base. This design not only ensures precise positioning of the partition on the base but also effectively prevents displacement or loosening during use through multi-point contact. The enclosed magnetic ring wire receiving area is thus more stable and reliable, providing a solid guarantee for the safe containment of the magnetic ring wire. Furthermore, this structural design simplifies the installation and disassembly process, improving overall ease of operation.

[0013] A further feature of this invention is that the base is provided with an arc-shaped boss, and the upper end of the partition is provided with an arc-shaped concave surface, which abuts against the outer periphery of the arc-shaped boss.

[0014] The further design, featuring a combination of curved bosses and curved concave surfaces, enhances the stability and tightness of the structure. This design not only strengthens the connection between the base and the partition through the interlocking curved surfaces, but also optimizes the overall stress distribution, making the structure more stable under external forces. Furthermore, the ingenious combination of curved bosses and curved concave surfaces helps reduce errors during assembly, ensuring that all components can be accurately joined together, thereby improving overall assembly accuracy and product quality.

[0015] Further features of this invention: the partition plate is provided with a support surface and a mating boss on both sides of the side corresponding to the middle seat; the middle seat and the base are provided with a protruding platform and a limiting groove on the opposite side; the base is also provided with a positioning boss; the support surface abuts against the protruding platform; the mating boss and the positioning boss are both inserted into the limiting groove to enclose the arc generation area; and the third exhaust port is provided on the bottom surface of the middle seat.

[0016] By employing the aforementioned further design, through the contact between the supporting surface and the protruding platform, and the insertion of the protruding platform and the positioning protrusion into the limiting groove, this design cleverly constructs the boundary of the arc-generating zone, ensuring stable combustion of the arc within the predetermined space. Simultaneously, this structural arrangement effectively guides the heat and gases generated by the arc, rapidly dissipating them through the third exhaust port, thus preventing potential damage to other internal components of the circuit breaker from the arc.

[0017] A further feature of this invention is that the third exhaust port is provided with multiple ports.

[0018] By further optimizing the design by incorporating multiple third vents, the heat and gases generated by the electric arc can be discharged more efficiently. This design not only improves heat dissipation efficiency but also enhances the safety performance of the circuit breaker. The distribution of multiple vents allows for a more even distribution of the heat generated by the electric arc, preventing localized overheating and thus extending the service life of the circuit breaker. Attached Figure Description

[0019] Figure 1 This is a structural diagram of a specific embodiment of the present utility model; Figure 2 This is an internal structural diagram of a specific embodiment of the present utility model; Figure 3 This is a structural diagram of one side of the L-pole of the middle seat in a specific embodiment of this utility model; Figure 4 for Figure 3 A magnified view of a portion of the image; Figure 5 This is a structural diagram of the upper cover of a specific embodiment of the present utility model; Figure 6 This is a structural diagram of one side of the N-pole of the central seat in a specific embodiment of this utility model; Figure 7 for Figure 6 The structural diagram of the central seat; Figure 8 This is a structural diagram of the base according to a specific embodiment of the present utility model; Figure 9 This is a structural diagram of the partition component corresponding to one side of the base in a specific embodiment of this utility model; Figure 10 This is a structural diagram of the partition component corresponding to one side of the middle seat in a specific embodiment of this utility model; Figure 11 This is an assembly diagram of the partition and base according to a specific embodiment of the present utility model.

[0020] In the diagram: 1. Circuit breaker housing; 3. Residual current trip unit wire; 4. Magnetic ring wire; 5. Arc extinguishing chamber; 51. First vent; 52. Second vent; 11. Base; 111. Limiting platform; 112. Arc-shaped boss; 113. Positioning boss; 12. Middle seat; 121. Protruding platform; 122. Limiting groove; 13. Top cover; 61. Residual current trip unit wire receiving area; 62. First arc venting channel; 63. Second arc venting channel; 64. First vent; 65. Second vent; 66. Vent hole; 81. First arc isolation plate; 82. Second arc isolation plate; 83. Arc isolation plate A; 84. Arc isolation plate B; 72. Magnetic ring wire receiving area; 73. Arc generating area; 74. Third vent; 9. Partition; 91. Supporting boss; 92. Arc-shaped concave surface; 93. Supporting surface; 94. Mating boss. Detailed Implementation

[0021] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] like Figure 1-11 As shown, the wiring and venting structure of a residual current circuit breaker according to this utility model includes a circuit breaker housing 1, a residual current trip conductor 3, a magnetic ring conductor 4, and an arc-extinguishing chamber 5. The arc-extinguishing chamber 5 includes multiple parallel metal arc-extinguishing grids. The circuit breaker housing 1 includes a base 11, a middle seat 12, and a top cover 13. The base 11, middle seat 12, and top cover 13 are connected by plugging or screws. The middle seat 12 cooperates with the top cover 13 and the base 11 to form an L-pole base and an N-pole base, respectively. The residual current trip conductor 3 and the arc-extinguishing chamber 5 are located in the L-pole base, and the magnetic ring conductor 4 is located in the N-pole base. The arc-extinguishing chamber 5 is provided with a first air outlet 51 and a second air outlet 52 distributed vertically, with each outlet having multiple outlets. The first air outlet 51 is located above the second air outlet 52. The L-electrode base has mutually spaced leakage trip wire receiving area 61, a first arc-running exhaust channel 62, and a second arc-running exhaust channel 63. The bottom surface of the L-electrode base is provided with a first exhaust port 64 and a second exhaust port 65. The first air outlet 51 and the first exhaust port 64 are connected through the first arc-running exhaust channel 62, and the second air outlet 52 and the second exhaust port 65 are connected through the second arc-running exhaust channel 63. The first arc-running exhaust channel 62 and the second arc-running exhaust channel 63 are also connected through a vent 66. The leakage trip wire 3 is located in the leakage trip wire receiving area 61. The N-pole substrate has a magnetic ring conductor receiving area 72 and an arc generating area 73 formed inside it. The magnetic ring conductor receiving area 72 and the arc generating area 73 are spaced apart from each other. A third vent 74 is provided on the bottom surface of the N-pole substrate. The arc generating area 73 is connected to the third vent 74. The magnetic ring conductor 4 is disposed in the magnetic ring conductor receiving area 72. There are multiple third vents 74.

[0023] Specifically, the middle seat 12 and the upper cover 13 are respectively provided with a first arc-blocking plate 81 and a second arc-blocking plate 82 on opposite sides. The first and second arc-blocking plates 82 abut against each other to form an isolation structure between the first arc-running exhaust channel 62 and the second arc-running exhaust channel 63. The middle seat 12 and the upper cover 13 are also respectively provided with an arc-blocking plate A83 and an arc-blocking plate B84 on opposite sides. The arc-blocking plates A and B abut against each other to form an isolation structure between the leakage current trip device wire receiving area 61 and the first arc-running exhaust channel 62. The vent 66 is opened on the first arc-blocking plate 81 or the second arc-blocking plate 82. The first exhaust port 64 and the second exhaust port 65 are provided on the bottom surface of the middle seat 12.

[0024] Specifically, a partition 9 is provided between the lower part of the middle seat 12 and the base 11, separating the magnetic ring wire receiving area 72 from the arc generating area 73. A supporting boss 91 is integrally provided on the upper end of the partition 9 corresponding to one side of the base. A limiting platform 111 is provided on the inner surface of the base 11. The supporting boss 91 abuts against the inner surface of the base 11, and the limiting platform 111 abuts against the plate surface of the partition 9. The lower end of the partition 9 abuts against the lower bottom wall of the base 11, thus enclosing the magnetic ring wire receiving area 72. An arc-shaped boss 112 is provided on the base 11, and an arc-shaped concave surface 92 is provided on the upper end of the partition 9, abutting against the outer periphery of the arc-shaped boss 112. The partition 9 is provided with a support surface 93 and a mating boss 94 on both sides of the middle seat. The middle seat 12 has a protruding platform 121 and a limiting groove 122 on the opposite side of the base. The base 11 is also provided with a positioning boss 113. The support surface 93 abuts against the protruding platform 121. The mating boss 94 and the positioning boss 113 are both inserted into the limiting groove 122 to enclose the arc generation area 73. The third exhaust port 74 is provided on the bottom surface of the middle seat 12.

[0025] The working principle of this utility model: (a) Arc treatment and venting of the L-electrode substrate 1. Arc extinguishing and multi-channel exhaust If the moving and stationary contacts on the L-side come into contact and generate an electric arc, the arc is drawn into the metal arc-extinguishing grid in the arc-extinguishing chamber and divided into multiple short arcs. Part of the gas is discharged through the first outlet → the first arc-running exhaust channel → the first exhaust port; the other part of the gas is discharged through the second outlet → the second arc-running exhaust channel → the second exhaust port. At the same time, the two exhaust channels are connected by a vent hole to balance the pressure and avoid excessive local pressure, thereby improving exhaust efficiency.

[0026] 2. Wire isolation protection The leakage current trip unit wire is located in an independent leakage current trip unit wire receiving area. The arc isolation plates A and B abut against each other to form an isolation structure between the leakage current trip unit wire receiving area and the first arc venting channel, preventing electric arc and high temperature gas from directly contacting the wire and avoiding damage to the wire insulation.

[0027] (II) Arc treatment and venting of the N-electrode substrate If an electric arc is generated on the N-pole side, the arc is concentrated in the arc generation area and is directly discharged through the third exhaust port to avoid contact with the magnetic ring wire.

[0028] The magnetic ring conductor is located in the magnetic ring conductor receiving area and is isolated from the arc generation area by a partition.

[0029] In summary, through the coordinated design of functional zoning, conductor isolation, and multi-channel venting, this structure can efficiently extinguish electric arcs and expel gases, while protecting each conductor from arc interference, thus ensuring the reliability of circuit breaker disconnection and the accuracy of leakage current detection.

[0030] It should be noted that in the description of this utility model, all directional indicators (such as up, down, forward, backward, etc.) are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0031] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication 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 utility model based on the specific circumstances.

Claims

1. A wiring and venting structure for a residual current circuit breaker, comprising a circuit breaker housing (1), a residual current trip conductor (3), a magnetic ring conductor (4), and an arc-extinguishing chamber (5), wherein the arc-extinguishing chamber (5) comprises a plurality of parallel metal arc-extinguishing grids, the circuit breaker housing (1) comprises a base (11), a middle seat (12), and a top cover (13), wherein the middle seat (12) cooperates with the top cover (13) and the base (11) to form an L-pole base and an N-pole base, the residual current trip conductor (3) and the arc-extinguishing chamber (5) are disposed in the L-pole base, and the magnetic ring conductor (4) is disposed in the N-pole base, characterized in that: The arc-extinguishing chamber (5) is provided with a first air outlet (51) and a second air outlet (52) distributed vertically. The L-electrode base has a leakage trip wire receiving area (61), a first arc-running exhaust channel (62) and a second arc-running exhaust channel (63) formed inside it. The bottom surface of the L-electrode base is provided with a first exhaust port (64) and a second exhaust port (65). The first air outlet (51) and the first exhaust port (64) are connected through the first arc-running exhaust channel (62). The second air outlet (52) and the second exhaust port (65) are connected through the second arc-running exhaust channel (63). The first arc-running exhaust channel (62) and the second arc-running exhaust channel (63) are also connected through a vent (66). The leakage trip wire (3) is located in the leakage trip wire receiving area (61). The N-pole substrate has a magnetic ring wire receiving area (72) and an arc generating area (73) formed inside it. The magnetic ring wire receiving area (72) and the arc generating area (73) are spaced apart from each other. A third exhaust port (74) is provided on the bottom surface of the N-pole substrate. The arc generating area (73) and the third exhaust port (74) are connected. The magnetic ring wire (4) is located in the magnetic ring wire receiving area (72).

2. The wiring and venting structure of the residual current circuit breaker according to claim 1, characterized in that: The middle seat (12) and the upper cover (13) are respectively provided with a first arc-blocking plate (81) and a second arc-blocking plate (82). The first and second arc-blocking plates (82) abut against each other to form an isolation structure between the first arc-running exhaust channel (62) and the second arc-running exhaust channel (63). The middle seat (12) and the upper cover (13) are also respectively provided with an arc-blocking plate A (83) and an arc-blocking plate B (84). The arc-blocking plates A and B abut against each other to form an isolation structure between the leakage current trip device wire receiving area (61) and the first arc-running exhaust channel (62). The vent (66) is opened on the first arc-blocking plate (81) or the second arc-blocking plate (82). The first exhaust port (64) and the second exhaust port (65) are located on the bottom surface of the middle seat (12).

3. The wiring and venting structure of the residual current circuit breaker according to claim 1, characterized in that: A partition (9) is provided between the lower part of the middle seat (12) and the base (11), and the partition (9) separates the magnetic ring wire receiving area (72) from the arc generating area (73).

4. The wiring and venting structure of the residual current circuit breaker according to claim 3, characterized in that: The partition (9) has a support boss (91) on the upper end of the side corresponding to the base. The inner surface of the base (11) has a limiting platform (111). The support boss (91) abuts against the inner surface of the base (11), the limiting platform (111) abuts against the plate surface of the partition (9), and the lower end of the partition (9) abuts against the lower bottom wall of the base (11) to enclose the magnetic ring wire receiving area (72).

5. The wiring and venting structure of the residual current circuit breaker according to claim 4, characterized in that: The base (11) is provided with an arc-shaped boss (112), and the upper end of the partition (9) is provided with an arc-shaped concave surface (92), which abuts against the outer periphery of the arc-shaped boss (112).

6. The wiring and venting structure of the residual current circuit breaker according to claim 4, characterized in that: The partition (9) has a support surface (93) and a mating boss (94) on each side of the middle seat. The middle seat (12) has a protruding platform (121) and a limiting groove (122) on the opposite side of the base. The base (11) also has a positioning boss (113). The support surface (93) abuts against the protruding platform (121). The mating boss (94) and the positioning boss (113) are both inserted into the limiting groove (122) to enclose the arc generation area (73). The third exhaust port (74) is located on the bottom surface of the middle seat (12).

7. The wiring and venting structure of the residual current circuit breaker according to any one of claims 1-6, characterized in that: The third exhaust port (74) is provided with multiple outlets.

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