Arc fault protection circuit breaker

Abstract

The utility model provides an arc fault protection circuit breaker, which comprises a shell provided with a first area for arranging a fault detection circuit board and a second area for arranging an operating mechanism and an arc extinguish chamber, a partition plate assembly is arranged between the first area and the second area, a notch is formed on the partition plate assembly, and an indication window is arranged above the first area; the fault detection circuit board is provided with an indicator lamp for fault indication; the light guide part is provided with a light guide body penetrating through the notch, a first end and a second end, the first end and the second end are arranged at the two ends of the light guide body respectively, the first end corresponds to the indicating window, and the second end corresponds to the indicating lamp. Since the indicating lamp is arranged on the fault detection circuit board, and the light guide part transmits the light of the indicating lamp to the indicating window of the shell, compared with the mode that the indicating lamp circuit board is adjacent to the window of the shell in the prior art, the indicating lamp is far away from the indicating window, and the service life of the indicating lamp is ensured due to the existence of the partition plate assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of small circuit breakers, in particular to an arc fault protection circuit breaker. Background Art

[0002] Arc fault protection circuit breaker (AFDD for short) is a new type of protective electrical device that can detect arc faults in electrical circuits and cut off the circuit before causing electrical fires, effectively preventing electrical fires caused by arc faults.

[0003] The existing arc fault protection circuit breaker includes a housing, a fault detection circuit board and an indicator circuit board. The indicator circuit board is arranged near the window opening at the edge of the housing and is connected to the fault detection circuit board through a circuit. The indicator circuit board is provided with an indicator light corresponding to the window opening on the housing. When an arc fault or leakage fault occurs, the fault detection circuit board can detect the above fault and display the corresponding fault through the indicator light to remind the maintenance personnel of the cause of the fault. The inventor found in actual use that the circuit board between the indicator circuit board and the fault detection circuit board is prone to breakage after long-term use, affecting the fault indication function; in addition, since the indicator circuit board is arranged near the window opening of the housing, external dust or water can easily enter the housing through the window opening, thereby affecting the service life of the indicator circuit board. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defects of short service life and low reliability of indicator light circuit boards in the prior art, thereby providing an arc fault protection circuit breaker with long service life and high reliability.

[0005] To this end, the utility model provides an arc fault protection circuit breaker, including a shell, a fault detection circuit board and a light guide, the shell having a first area for arranging the fault detection circuit board, and a second area for arranging the operating mechanism and the arc extinguishing chamber, a partition assembly is provided between the first area and the second area, a notch is formed on the partition assembly, and an indication window is provided above the first area; the fault detection circuit board is provided with an indicator light for fault indication; the light guide has a light guide body passing through the notch, and a first end and a second end respectively arranged at both ends of the light guide body, the first end is arranged corresponding to the indication window, and the second end is arranged corresponding to the indicator light.

[0006] The housing is provided with a supporting column which abuts against the bottom of the light guide member.

[0007] A limit block abutting against the side surface of the light guide is provided on the top of the support column, and the limit block is provided between the light guide and the operating mechanism.

[0008] The first end of the light guide extends from the inside of the housing to the outside of the indication window.

[0009] The outer dimensions of the first end are adapted to the indicating window.

[0010] The shell comprises a cover plate, a base and a middle sleeve, wherein the middle sleeve is located between the cover plate and the base, and the partition assembly is disposed on the middle sleeve and the cover plate.

[0011] The partition assembly includes a first partition disposed on the middle sleeve and extending toward the cover plate, and a second partition disposed on the cover plate and extending toward the middle sleeve, and the notch is formed on both the first partition and the second partition.

[0012] The first partition plate and the second partition plate are staggered.

[0013] The technical solution of the utility model has the following advantages:

[0014] 1. The arc fault protection circuit breaker provided by the utility model is provided with an indicator light for fault indication directly on the fault detection circuit board, and then the light guide transmits the light of the indicator light to the indication window of the shell. Compared with the prior art method of opening a window adjacent to the shell on the indicator light circuit board, the indicator light is farther away from the indication window, and due to the presence of the partition assembly, the service life of the indicator light is guaranteed, and the light guide is not easy to break and has a long service life.

[0015] 2. In the arc fault protection circuit breaker provided by the utility model, a limit block is provided on the top of the support column, which abuts against the side of the light guide, and the limit block is provided between the light guide and the operating mechanism, so as to avoid interference of the light guide with the operating mechanism.

[0016] 3. In the arc fault protection circuit breaker provided by the utility model, the first partition and the second partition are staggered, so that the partition effect between the first area and the second area is better, thereby better protecting the fault detection circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of the arc fault protection circuit breaker of the utility model;

[0019] Figure 2Schematic diagram of the exploded structure of the arc fault protection circuit breaker;

[0020] Figure 3 The figure is a schematic diagram of the disassembly of the light guide and the middle sleeve;

[0021] Figure 4 A cross-sectional view of an arc fault protection circuit breaker;

[0022] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of part A.

[0023] Explanation of the accompanying drawings: 1. First area; 2. Second area; 3. Shell; 4. Fault detection circuit board; 5. Partition assembly; 6. Notch; 7. Indicator window; 8. Light guide; 9. Support column; 10. Light guide body; 11. First end; 12. Second end; 13. Limit block; 14. Cover plate; 15. Base; 16. Middle sleeve; 17. First partition; 18. Second partition. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Example

[0029] This embodiment provides an arc fault protection circuit breaker, such as Figure 1 As shown, it includes a housing 3, a fault detection circuit board 4 and a light guide 8.

[0030] Shell 3, such as Figure 1 As shown, there is a first area 1 where a fault detection circuit board 4 is arranged, and a second area 2 where an operating mechanism and an arc extinguishing chamber (not shown in the figure) are arranged, a partition assembly 5 is arranged between the first area 1 and the second area 2, and a notch 6 is formed on the partition assembly 5, and an indication window 7 is arranged above the first area 1. In this embodiment, as Figure 2 As shown, the housing 3 includes a cover plate 14, a base 15 and a middle sleeve 16. The middle sleeve 16 is located between the cover plate 14 and the base 15. The middle sleeve 16 and the cover plate 14 are both provided with the partition assembly 5. Figure 3 , Figure 4 and Figure 5 As shown, the partition assembly 5 includes a first partition 17 provided on the middle sleeve 16 and extending toward the cover plate 14, and a second partition 18 provided on the cover plate 14 and extending toward the middle sleeve 16. The first partition 17 and the second partition 18 are staggered left and right, and the first partition 17 and the second partition 18 are both formed with the notch 6. It should be noted that the operating mechanism and the arc extinguishing chamber are existing mature technologies, so their specific structure and working principle are not described in detail.

[0031] The fault detection circuit board 4 is provided with an indicator light for fault indication.

[0032] Light guide 8, such as Figure 1 and Figure 3 As shown, there is a light guide body 10 passing through the notch 6, and a first end 11 and a second end 12 respectively arranged at both ends of the light guide body 10, the first end 11 is arranged corresponding to the indication window 7, and the second end 12 is arranged corresponding to the indicator light. The housing 3 is provided with a support column 9 abutting against the bottom of the light guide 8, and the top of the support column 9 is provided with a limit block 13 abutting against the side of the light guide 8, and the limit block 13 is arranged between the light guide 8 and the operating mechanism. The first end 11 of the light guide 8 extends from the inside of the housing 3 to the outside of the indication window 7, and the outer dimensions of the first end 11 are adapted to the indication window 7, so as to ensure the sealing performance.

[0033] The arc fault protection circuit breaker provided by the utility model is provided with an indicator light for fault indication directly on the fault detection circuit board 4, and then the light guide 8 transmits the light of the indicator light to the indication window 7 of the shell 3. Compared with the window opening method of the indicator light circuit board adjacent to the shell in the prior art, the indicator light is farther away from the indication window, and due to the existence of the partition assembly, the service life of the indicator light is further extended, and the light guide is not easy to break and has a long service life.

[0034] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. An arc fault protection circuit breaker, characterized in that: include: A housing (3) comprising a first area (1) on which a fault detection circuit board (4) is arranged, and a second area (2) on which an operating mechanism and an arc extinguishing chamber are arranged, a partition assembly (5) being arranged between the first area (1) and the second area (2), a notch (6) being formed on the partition assembly (5), and an indication window (7) being arranged above the first area (1); A fault detection circuit board (4) is provided with an indicator light for indicating a fault; The light guide (8) comprises a light guide body (10) passing through the notch (6), and a first end (11) and a second end (12) respectively arranged at two ends of the light guide body (10), wherein the first end (11) is arranged corresponding to the indication window (7), and the second end (12) is arranged corresponding to the indication light.

2. The arc fault protection circuit breaker according to claim 1, characterized in that: The housing (3) is provided with a support column (9) which abuts against the bottom of the light guide member (8).

3. The arc fault protection circuit breaker according to claim 2, characterized in that: A limit block (13) is provided at the top of the support column (9) and abuts against the side surface of the light guide (8); the limit block (13) is provided between the light guide (8) and the operating mechanism.

4. The arc fault protection circuit breaker according to claim 1, characterized in that: The first end (11) of the light guide (8) extends from the inside of the housing (3) to the outside of the indication window (7).

5. The arc fault protection circuit breaker according to claim 1, characterized in that: The outer dimensions of the first end (11) are adapted to those of the indication window (7).

6. The arc fault protection circuit breaker according to claim 1, characterized in that: The shell (3) comprises a cover plate (14), a base (15) and a middle sleeve (16); the middle sleeve (16) is located between the cover plate (14) and the base (15); and the partition assembly (5) is provided on both the middle sleeve (16) and the cover plate (14).

7. The arc fault protection circuit breaker according to claim 6, characterized in that: The partition assembly (5) comprises a first partition (17) provided on the middle sleeve (16) and extending in the direction of the cover plate (14), and a second partition (18) provided on the cover plate (14) and extending in the direction of the middle sleeve (16), wherein the notch (6) is formed on both the first partition (17) and the second partition (18).

8. The arc fault protection circuit breaker according to claim 7, characterized in that: The first partition plate (17) and the second partition plate (18) are staggered.

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