Zero-fly-arc installation structure of a circuit breaker

Abstract

The present invention relates to a zero-arcing installation structure for a circuit breaker, which includes a circuit breaker housing and a terminal cover. A plurality of wiring terminal cavities are distributed on both sides of the circuit breaker housing. The terminal cover is installed on the circuit breaker housing and covers the wiring terminal cavities. One side of each wiring terminal cavity is hollowed out to form an assembly opening. A foldable partition is provided at the corresponding bottom of the assembly opening. The installation structure further includes a plurality of protection modules. Each protection module includes a multi-layer grid unit and a protection housing. The protection housing includes an installation cavity, and the installation cavity is a box body with an opening on one side. The multi-layer grid unit is arranged in the installation cavity. The foldable partition is folded down along the folding line in the middle to form an installation opening, and the installation cavity is arranged in the installation opening. Compared with the prior art, the present invention realizes the zero-arcing function, has a reliable protection function, can be loaded and unloaded by the customer himself, and is convenient to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and particularly to a zero-fly arc installation structure for a circuit breaker. Background Art

[0002] During the use of a molded case circuit breaker, especially during the breaking test, a huge amount of energy is released by means of arc spraying. Many metal particles follow the arc and directly spray out, piercing through the baffle at the incoming line end of the circuit breaker and flying out of the circuit breaker. Therefore, a general circuit breaker stipulates a fly arc distance. Even so, the harm of fly arc particles is still very large. There are two methods to prevent fly arc particles. One is to fundamentally control the breaking energy of the circuit breaker to reduce the fly arc phenomenon; the other is to use a zero-fly arc cover to block the fly arc particles.

[0003] The following problems exist in the use of the zero-fly arc cover: Most of the existing zero-fly arc covers are produced in a bound manner with the product and are already installed at the factory. The installation structure is complex and customers cannot install or uninstall it by themselves. That is to say, each model of circuit breaker is divided into two versions, one with a zero-fly arc cover and the other without a zero-fly arc cover. When customers face different usage scenarios, they often need to replace the entire circuit breaker, which is very inconvenient to use; at the same time, it also causes certain difficulties in the maintenance and repair of the circuit breaker. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned defects existing in the prior art and provide a zero-fly arc installation structure for a circuit breaker, which simplifies the structure and can be quickly installed and uninstalled.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A zero-fly arc installation structure for a circuit breaker includes a circuit breaker housing and a terminal cover. A plurality of terminal connection cavities are distributed on both sides of the circuit breaker housing. The terminal cover is installed on the circuit breaker housing and covers the terminal connection cavities. One side of each terminal connection cavity is hollowed out to form an assembly opening. A foldable partition is provided at the corresponding bottom of the assembly opening. The installation structure further includes a plurality of protection modules. Each protection module includes a multi-layer grid unit and a protection housing. The protection housing includes an installation cavity. The installation cavity is a box body with an opening on one side. The multi-layer grid unit is arranged in the installation cavity. The foldable partition is folded down along the folding line in the middle to jointly form an installation opening with the inner side wall of the terminal connection cavity. The installation cavity is arranged in the installation opening.

[0007] Further, in the protection module, the multi-layer grid unit includes a U-shaped grid and multiple layers of grids. Clamping groove bosses are provided on the upper and lower sides or left and right sides of the entrance of the installation cavity. The two ends of the U-shaped grid respectively abut against the clamping groove bosses, and the multiple layers of grids abut against the bent section of the U-shaped grid.

[0008] Further, in the protection module, the multi-layer grid sheets include flat grid sheets and melamine sheets which are cross-laminated, and spaced bosses are distributed on both the front and back surfaces of the flat grid sheets.

[0009] Further, in the protection module, the distribution of the spaced bosses on both the front and back surfaces of each flat grid sheet is inconsistent, and the surfaces with the same distribution of the spaced bosses between two adjacent flat grid sheets face each other.

[0010] Further, in the protection module, a positioning strip is provided in the installation cavity, and a positioning groove is provided in the multi-layer grid sheet unit. After the multi-layer grid sheet unit is installed in the installation cavity, the positioning strip and the positioning groove are fitted with each other.

[0011] Further, the foldable partition is made of cardboard.

[0012] Further, interference fit bumps are provided on both sides of the protection housing.

[0013] Further, the protection housing further includes an L-shaped assembly plate which is arranged at the top of the installation cavity. When the installation cavity and the installation opening are assembled, the bottom surface of the horizontal plate in the L-shaped assembly plate fits against the top surface of the terminal connection cavity.

[0014] Further, a slot is provided between two adjacent terminal connection cavities, and longitudinal rib plates are provided on the terminal cover. The longitudinal rib plates are inserted into the slots to complete the assembly of the terminal cover and the circuit breaker housing.

[0015] Further, a limiting plate is also provided on the protection housing. After the terminal cover and the circuit breaker housing are assembled, the limiting plate is horizontally placed between the protection module and the circuit breaker housing.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention provides a foldable partition and a protection module on the circuit breaker housing. When in normal use, the foldable partition and the terminal cover are directly used as the protective covers for the terminals; when the zero arcing function is required, only the foldable partition needs to be folded to form an installation opening, and then the protection module can be installed at the installation opening to achieve quick installation; thus, the user can conveniently load and unload the protection module according to the needs and select whether to require the zero arcing function, and the operation is convenient.

[0018] 2. The multi-layer grid sheet unit in the protection module is composed of a U-shaped grid sheet and multi-layer grid sheets. The U-shaped grid sheet can not only protect against arcing but also ensure the positioning of the multi-layer grid sheets, and the processing and production are convenient and the structure is reliable.

[0019] 3. Spaced bosses are distributed on both the front and back surfaces of the flat grid sheets in the multi-layer grid sheets, which can avoid the situation of adhesion between the grid sheets due to high-temperature particles; at the same time, the different distributions on the front and back surfaces of the flat grid sheets can more effectively block the arcing particles.

[0020] 4. The foldable partition is made of cardboard, and the ductility of the cardboard can ensure that the air pressure in the circuit breaker cavity will not be too high during normal use, avoiding the occurrence of shell rupture.

[0021] 5. Longitudinal rib plates are provided on the terminal cover, which can not only improve the strength of the terminal cover itself but also simplify the installation method; a limiting plate is also provided on the protective housing, which is horizontally placed between the protective module and the circuit breaker housing, improving the assembly stability of the protective module. Brief Description of the Drawings

[0022] Figure 1 It is an exploded view of the partial structure of the present invention equipped with the zero-fly arc function.

[0023] Figure 2 It is an exploded view of the partial structure of the present invention in the general use state.

[0024] Figure 3 It is a schematic structural diagram of the protective module.

[0025] Figure 4 It is a schematic structural diagram of the protective housing.

[0026] Figure 5 It is a schematic structural diagram of the multi-layer grid sheet unit.

[0027] Figure 6 It is a schematic structural diagram of the flat grid sheet.

[0028] Figure 7 It is a schematic structural diagram of the assembly of the circuit breaker housing and the terminal cover.

[0029] Figure 8 It is a schematic structural diagram of the protective housing from another angle.

[0030] Reference Numerals: 1. Circuit breaker housing, 11. Wiring terminal cavity, 11a. Assembly port, 12. Foldable partition, 13. Slot, 2. Terminal cover, 21. Longitudinal rib plate, 3. Protective module, 31. Multi-layer grid sheet unit, 31a. U-shaped grid sheet, 31a-1. Positioning strip, 31b. Flat grid sheet, 31b-1. Spacing boss, 31c. Melamine sheet, 31d. Positioning groove, 32. Protective housing, 32a. Installation cavity, 32a-1. Positioning strip, 32a-2. Card slot boss, 32b. L-shaped assembly plate, 32c. Limiting plate, 33. Interference fit boss. Detailed Embodiment

[0031] The present invention will be described in detail below with reference to the drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and the detailed implementation manner and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0032] As shown Figure 1 in the figure, this embodiment provides a zero-fly-arc installation structure for a circuit breaker, which includes a circuit breaker housing 1, a protection module 3, and a terminal cover 2. A plurality of wiring terminal cavities 11 are distributed on both sides of the circuit breaker housing 1, and the terminal cover 2 is installed on the circuit breaker housing 1 and covers the wiring terminal cavities 11. An assembly opening 11a is formed by hollowing out one side of each wiring terminal cavity 11. A foldable partition 12 is provided at the corresponding bottom of the assembly opening 11a, and clamping grooves are provided on both sides of the bottom. The edge of the foldable partition 12 is embedded in the clamping grooves for fixation. The folding line of the foldable partition 12 is located at the central horizontal position. The foldable partition 12 can be made of a thin plastic plate or cardboard, and cardboard is preferably used in this embodiment. The bottom corresponding to the assembly opening 11a in the wiring terminal cavity 11 is a hollow structure, see Figure 2 .

[0033] In the use without the zero-fly-arc function, as Figure 2 shown in the figure, the foldable partition 12 directly serves as a spacer to cover the hollow to protect the inside of the circuit breaker, and can also play a role in preventing the internal air pressure of the circuit breaker from being too high and preventing the shell from bursting.

[0034] As Figures 3 to 5 shown in the figure, the number of protection modules 3 in the installation structure corresponds to the number of wiring terminal cavities 11 one by one. Each protection module 3 includes a multi-layer grid unit 31 and a protection housing 32. The protection housing 32 includes an installation cavity 32a and an L-shaped assembly plate 32b. The installation cavity 32a is a box body with an opening on the front. The L-shaped assembly plate 32b is provided at the top of the installation cavity 32a, and the lower end of the vertical plate of the L-shaped assembly plate 32b is connected to the top of the back of the installation cavity 32a. The multi-layer grid unit 31 is arranged in the installation cavity 32a, and the specific structure is unfolded as follows:

[0035] The multi-layer grid unit 31 includes a U-shaped grid 31a and multiple layers of grids. Clamping groove bosses 32a-2 are provided on the upper and lower sides or the left and right sides of the entrance of the installation cavity 32a. In this embodiment, the left and right sides are preferably used. The two ends of the U-shaped grid 31a respectively abut against the clamping groove bosses 32a-2, and the multiple layers of grids abut against the inner wall between the bent section of the U-shaped grid 31a and the back of the installation cavity 32a. The multiple layers of grids include flat grids 31b and melamine sheets 31c that are cross-laminated. Spacing bosses 31b-1 are distributed on both the front and back sides of the flat grids 31b. As Figure 6As shown, the distribution of the spaced bosses 31b-1 on the front and back sides of each flat grid plate 31b is inconsistent, and the sides with the same distribution of the spaced bosses 31b-1 between two adjacent flat grid plates 31b face each other. That is to say, each flat grid plate 31b has an A side and a B side, and at least three spaced bosses 31b-1 are punched out in different regions on the A side and the B side respectively for spacing. If the spaced bosses 31b-1 on the A side of the first plate face inwards, then the spaced bosses 31b-1 on the B side of the second iron grid plate face inwards. There are two advantages to this design: one is that there is a space between the grid plates, and they will not stick due to high-temperature particles; the other is that the grid plates are set with asymmetric AB sides, which can effectively block the arcing particles. A positioning strip 32a-1 is also provided at the bottom in the installation cavity 32a, and positioning grooves 31d are also provided at the bottom of the multi-layer grid plates. After the multi-layer grid plate unit 31 is installed in the installation cavity 32a, the positioning strip 32a-1 and the positioning grooves 31d are fitted with each other.

[0036] In summary, when the user needs to configure the zero-arcing function, first fold down the foldable partition 12 at each terminal connection cavity 11 along the folding line in the middle thereof. Part of the partition 12 serves as the bottom plate and the two inner side walls of the terminal connection cavity to jointly form an installation opening. There can be jacks at the top of the foldable partition 12 for easy folding. Install the protection modules 3 one by one into the installation openings. A limit groove is provided at the top of each terminal connection cavity 11. During assembly, the horizontal plate in the L-shaped assembly plate 32b is inserted into the limit groove, so that the installation cavity 32a is inserted into the installation opening. Interference fit bumps 33 can also be provided on both sides of the installation cavity 32a for interference fit with the inner wall of the terminal connection cavity 11 to improve the assembly stability.

[0037] As Figure 7 shown, a slot 13 is provided between two adjacent terminal connection cavities 11, and longitudinal rib plates 21 are also provided on the terminal cover 2. The longitudinal rib plates 21 are inserted into the slot 13 to complete the assembly of the terminal cover 2 and the circuit breaker housing 1. The longitudinal rib plates 21 can adopt a cavity structure with a double-layer wall thickness, which greatly improves the strength of the terminal cover 2 while simplifying the installation structure and effectively resists the destructive force at the moment of breaking. As Figure 8 shown, a limit plate 32c can also be provided on the protection housing 32. When the terminal cover 2 and the circuit breaker housing 1 are assembled, the limit plate 32c is horizontally placed between the protection module 3 and the circuit breaker housing 1 to further improve the assembly stability of the protection module 3.

[0038] The usage process of this embodiment is as follows:

[0039] When in normal use, the user can directly use the foldable partition 12 and the terminal cover 2 as the protective covers for the terminals to play a protective role, as Figure 2 shown;

[0040] When the zero-flying arc function is required, only the foldable partition 12 needs to be folded to form the assembly port 11a, and then the protection module 3 can be quickly installed by loading it at the assembly port 11a, as Figure 1 shown.

[0041] Thus, the user can conveniently load and unload the protection module 3 according to the needs, and choose whether to add the zero-flying arc function, which is easy to operate.

[0042] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations according to the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A zero-flying arc installation structure of a circuit breaker, comprising a circuit breaker housing (1) and a terminal cover (2). A plurality of wiring terminal cavities (11) are distributed on both sides of the circuit breaker housing (1). The terminal cover (2) is installed on the circuit breaker housing (1) and covers the wiring terminal cavities (11), characterized in that, On one side of each terminal cavity (11), a hollowed-out assembly opening (11a) is formed. A foldable partition (12) is provided at the bottom corresponding to the assembly opening (11a). The installation structure further includes a plurality of protection modules (3). Each protection module (3) includes a multi-layer grid unit (31) and a protection housing (32). The protection housing (32) includes an installation cavity (32a). The installation cavity (32a) is a box body with an opening on one side. The multi-layer grid unit (31) is arranged in the installation cavity (32a). The foldable partition (12) is folded down along the folding line in the middle to jointly form an installation opening with the inner side wall of the terminal cavity (11). The installation cavity (32a) is arranged in the installation opening. In the normal working mode, the user directly uses the foldable partition (12) and the terminal cover (2) as the shields for the terminals. In the zero arc flash working mode, the foldable partition (12) is folded to form an installation opening, and then the protection module (3) is installed at the installation opening.

2. The zero-arc installation structure of the circuit breaker according to claim 1, characterized in that, In the protection module (3), the multi-layer grid unit (31) includes a U-shaped grid (31a) and multiple layers of grids. On the upper and lower sides or the left and right sides of the entrance of the installation cavity (32a), there are card slot bosses (32a-2). The two ends of the U-shaped grid (31a) respectively abut against the card slot bosses (32a-2), and the multiple layers of grids abut against the bent section of the U-shaped grid (31a).

3. The zero arc-flight mounting structure of the circuit breaker according to claim 2, characterized in that, In the protection module (3), the multiple layers of grids include flat grid plates (31b) and melamine sheets (31c) that are cross-laminated. Spacing bosses (31b-1) are distributed on both the front and back sides of the flat grid plates (31b).

4. The zero-fly-arc installation structure of the circuit breaker according to claim 3, characterized in that, In the protection module (3), the distribution of the spacing bosses (31b-1) on both the front and back sides of each flat grid plate (31b) is inconsistent. The sides with the same distribution of the spacing bosses (31b-1) between two adjacent flat grid plates (31b) face each other.

5. The zero-flying arc installation structure of the circuit breaker according to claim 1, characterized in that, In the protection module (3), a positioning strip (32a-1) is provided in the installation cavity (32a). The multi-layer grid unit (31) is provided with a positioning groove (31d). After the multi-layer grid unit (31) is installed in the installation cavity (32a), the positioning strip (32a-1) and the positioning groove (31d) are mutually engaged.

6. The zero-arcing installation structure of the circuit breaker according to claim 1, characterized in that, The foldable partition (12) is made of cardboard.

7. The zero-flying arc installation structure of the circuit breaker according to claim 1, characterized in that, Interference fit bumps (33) are provided on both sides of the protection housing (32).

8. The zero arc-flying mounting structure of the circuit breaker according to claim 1, characterized in that, The protection housing (32) further includes an L-shaped assembly plate (32b). The L-shaped assembly plate (32b) is arranged at the top of the installation cavity (32a). When the installation cavity (32a) and the installation opening are assembled, the bottom surface of the horizontal plate in the L-shaped assembly plate (32b) fits against the top surface of the terminal cavity (11).

9. The zero-arcing installation structure of the circuit breaker according to claim 1, characterized in that, A slot (13) is provided between two adjacent terminal cavities (11). The terminal cover (2) is provided with a longitudinal rib plate (21). The longitudinal rib plate (21) is inserted into the slot (13) to complete the assembly of the terminal cover (2) and the circuit breaker housing (1).

10. The zero-fly-arc installation structure of the circuit breaker according to claim 1, characterized in that, A limiting plate (32c) is further provided on the described protective housing (32). After the terminal cover (2) and the circuit breaker housing (1) are assembled, the limiting plate (32c) is horizontally placed between the protection module (3) and the circuit breaker housing (1).

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