Direct-current circuit breaker

Abstract

The utility model belongs to the field of electrical technology, in particular to a direct-current circuit breaker, which comprises a circuit breaker body, and further comprises an arc extinguish chamber module which is of a detachable closed structure and comprises a first shell and a second shell which are detachably connected with each other; the arc extinguishing grid group is arranged in the arc extinguishing chamber module and comprises a plurality of first grids and second grids which are alternately arranged, each first grid is provided with a first arc extinguishing surface inclined towards a first direction, each second grid is provided with a second arc extinguishing surface inclined towards a second direction, and the first direction is opposite to the second direction; therefore, arc extinguishing channels used for lengthening electric arcs are formed between the arc extinguishing surfaces of the adjacent grids. According to the utility model, the circuit breaker body is provided with the detachable closed arc extinguish chamber module, and the first grid and the second grid with the arc extinguish surfaces inclined in opposite directions are used in the module to form a channel for lengthening the arc, so that the arc path is prolonged in a limited space, and the arc extinguish efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electrical technical field, especially direct current circuit breaker. BACKGROUND

[0002] The direct current circuit breaker is a key protection device of a direct current power system, mainly used for controlling the on-off of a direct current circuit, quickly cutting off the current in case of a fault, avoiding equipment damage and system fault expansion, and widely applied to new energy power generation, rail transit power supply, direct current power distribution network and other scenes.

[0003] In the prior art, the arc extinguishing chamber of the direct current circuit breaker needs to be designed in a limited space due to the overall structure limitation, the traditional arc extinguishing grids are arranged in parallel, the formed arc path is short, the arc voltage rises slowly, it is difficult to quickly dissipate the arc energy, the arc extinguishing efficiency is limited, the fault current cutting-off time may be prolonged, and the arc extinguishing chamber components are prone to be damaged, thereby affecting the service life and reliability of the circuit breaker. UTILITY MODEL CONTENTS

[0004] The utility model discloses a detachable closed arc extinguishing chamber module is arranged on the circuit breaker body, the first and second grids with opposite direction inclined arc extinguishing surfaces are arranged in the module to form an arc lengthening channel, the arc path is lengthened in the limited space, and the arc extinguishing efficiency is improved, so that the problems in the background art are solved.

[0005] The utility model discloses a detachable closed arc extinguishing chamber module is arranged on the circuit breaker body, the first and second grids with opposite direction inclined arc extinguishing surfaces are arranged in the module to form an arc lengthening channel, the arc path is lengthened in the limited space, and the arc extinguishing efficiency is improved, so that the problems in the background art are solved.

[0006] The arc extinguishing chamber module is composed of a first shell and a second shell which are detachably connected, and the arc extinguishing grid group is arranged in the arc extinguishing chamber module.

[0007] The arc extinguishing grid group is arranged in the arc extinguishing chamber module and includes a plurality of first grids and second grids arranged alternately, the first grid has a first arc extinguishing surface inclined to a first direction, the second grid has a second arc extinguishing surface inclined to a second direction, the first direction is opposite to the second direction, and the arc extinguishing surfaces of adjacent grids form an arc extinguishing channel for lengthening the arc.

[0008] The highest edge of the first arc extinguishing surface and the lowest edge of the second arc extinguishing surface are arranged in a staggered manner in the vertical direction.

[0009] The first shell is a cover body, and the second shell is a seat body for supporting the arc extinguishing grid group.

[0010] The present invention is further configured such that a grid fixing structure is provided on the inner wall of the base, and the arc extinguishing grid group is supported on the grid fixing structure.

[0011] The present invention is further configured such that the cover is provided with a pressure relief port that communicates with the interior of the arc-extinguishing chamber module.

[0012] The present invention is further configured such that the grid fixing structure consists of multiple parallel slots, and the two side edges of the first grid and the second grid are inserted into the slots.

[0013] The present invention is further configured such that the first grid and the second grid have the same structure and are alternately arranged in a 180-degree rotational symmetry manner.

[0014] The present invention is further configured such that an arc guide groove is formed on both the first arc extinguishing surface and the second arc extinguishing surface.

[0015] By adopting the above technical solution, the beneficial effects that this utility model can achieve are:

[0016] 1. By using the alternating first and second grids within the arc-extinguishing chamber module, and the arc-extinguishing surfaces that are tilted in opposite directions to form a tortuous arc-extinguishing channel, the path of the electric arc within a limited space is extended, the rise rate of the arc voltage is accelerated, and the energy dissipation performance of the electric arc is improved.

[0017] 2. The arc-extinguishing chamber module is constructed by using a first shell and a second shell that are detachably connected to form a closed structure. This facilitates the installation and maintenance of the internal arc-extinguishing grid assembly, effectively confines arc products, reduces the impact on external components, and improves the overall protective performance of the arc-extinguishing chamber.

[0018] 3. By alternating the first and second grids with identical structures in a 180-degree rotational symmetry manner, the types of parts and production process are simplified. At the same time, the grid fixing structure ensures stable installation, guarantees the stability of the arc extinguishing channel, and improves the structural adaptability of the circuit breaker. Attached Figure Description

[0019] Figure 1 This is a first three-dimensional structural schematic diagram of the circuit breaker body of this utility model;

[0020] Figure 2 This is a three-dimensional structural schematic diagram of the arc-extinguishing chamber module of this utility model;

[0021] Figure 3 This is an exploded structural diagram of the arc-extinguishing chamber module of this utility model;

[0022] Figure 4 This is a front view of the present invention;

[0023] Figure 5is a structural schematic view of the first grid and the second grid of the utility model;

[0024] Figure 6 is a structural schematic view of the first grid and the second grid in vertical direction of the utility model.

[0025] In the drawing, reference signs are: 1, circuit breaker body;2, arc extinguishing chamber module;20, first shell;200, cover body;21, second shell;210, seat body;3, arc extinguishing grid group;30, first grid;31, second grid;4, first arc extinguishing surface;5, second arc extinguishing surface;6, first direction;7, second direction;8, arc extinguishing channel;9, highest edge;10, lowest edge;11, grid fixing structure;110, slot;12, pressure relief port;13, electric arc guide groove. DETAILED DESCRIPTION

[0026] The utility model will be further described in conjunction with the specific embodiment of the accompanying drawings, refer to Figures 1-6 :

[0027] Embodiment 1

[0028] The embodiment provides a direct current circuit breaker, including circuit breaker body 1, still includes:

[0029] Arc extinguishing chamber module 2 is constructed as detachable closed structure, and it includes first shell 20 and second shell 21 that are detachably connected with each other;

[0030] Arc extinguishing grid group 3 is arranged in arc extinguishing chamber module 2, and it includes a plurality of first grid 30 and second grid 31 arranged alternately, first grid 30 has first arc extinguishing surface 4 inclined to first direction 6, second grid 31 has second arc extinguishing surface 5 inclined to second direction 7, first direction 6 and second direction 7 are opposite, so that the arc extinguishing surface between adjacent grids forms arc extinguishing channel 8 for elongating electric arc.

[0031] Arc extinguishing chamber module 2 is used for preventing electric arc from damaging components and provides installation base for arc extinguishing grid group 3;It is constructed as closed structure and is composed of first shell 20 and second shell 21;Shape is the cavity with hollow interior, is assembled in the vicinity of contact of circuit breaker body 1;First shell 20 and second shell 21 are connected by detachable mode such as buckle or bolt, and form closed space.

[0032] The arc-extinguishing grid group 3 is used to split, lengthen and cool the arc, and accelerate its extinction. The arc-extinguishing grid group 3 is composed of a plurality of first grids 30 and second grids 31 arranged alternately. The arc-extinguishing grid group 3 has a combined structure formed by a plurality of grids. The arc-extinguishing grid group 3 is located in the arc-extinguishing chamber module 2 and faces the direction in which the arc is generated. Each grid can be installed in the arc-extinguishing chamber module 2 by a fixing structure to maintain stable arrangement. The first grid 30 is used to form the arc-extinguishing channel 8 in cooperation with the second grid 31. The first grid 30 has a plate shape and a first arc-extinguishing surface 4 inclined to the first direction 6. The first grid 30 is connected to the fixing structure of the arc-extinguishing chamber module 2 by the two side edges to maintain the inclined angle. The second grid 31 is used to lengthen the arc path in cooperation with the first grid 30 and enhance the arc-extinguishing effect. The second grid 31 has a plate shape and a second arc-extinguishing surface 5 inclined to the second direction 7 opposite to the first direction 6. The second grid 31 is arranged alternately with the first grid 30 in the grid group and installed by the fixing structure to form regular intervals with the first grid 30.

[0033] The arc-extinguishing channel 8 is used to constrain the arc movement path and force the arc to extend to lengthen and cool. The arc-extinguishing channel 8 is formed by the first arc-extinguishing surface 4 of the first grid 30 and the second arc-extinguishing surface 5 of the second grid 31.

[0034] According to the above design, when the DC circuit breaker breaks the circuit or cuts off the fault current, the contact separation generates an arc, which enters the closed space of the arc-extinguishing chamber module 2 under the action of electric force. Since the first grid 30 and the second grid 31 are arranged alternately in the arc-extinguishing grid group 3, and the first arc-extinguishing surface 4 is inclined to the first direction 6 and the second arc-extinguishing surface 5 is inclined to the second direction 7 opposite to the first direction 6, the arc-extinguishing surfaces of adjacent grids form a tortuous arc-extinguishing channel 8. After the arc enters the channel, it is forced to extend along the tortuous path under the guidance of the inclined arc-extinguishing surface, and the path length is significantly increased compared with the traditional parallel grid. At the same time, the arc contacts the arc-extinguishing surfaces of a plurality of grids, and the heat is absorbed by the grids to reduce the temperature. In addition, the closed arc-extinguishing chamber module 2 constrains the arc products such as gas and metal vapor to avoid their diffusion affecting other components. When the arc is sufficiently lengthened and cooled to be insufficient to maintain combustion, the arc is extinguished, and the arc-extinguishing process is completed. If maintenance or replacement of components is required, the first shell 20 and the second shell 21 connected detachably can be disassembled to operate the arc-extinguishing grid group 3.

[0035] The highest edge 9 of the first arc extinguishing surface 4 and the lowest edge 10 of the second arc extinguishing surface 5 are staggered in the vertical direction. The purpose of the above design is to further optimize the degree of tortuosity of the arc extinguishing channel 8 and avoid the formation of a straight propagation path for the arc between the grids. The highest edge 9 of the first arc extinguishing surface 4 and the lowest edge 10 of the second arc extinguishing surface 5 are staggered in the vertical direction, which can make the arc extinguishing surfaces of adjacent grids form an up-down staggered layout, forcing the arc to constantly adjust its direction of movement when passing through the arc extinguishing channel 8, thereby prolonging the actual path length of the arc in a limited space, increasing the number of contacts and the contact area between the arc and the grid arc extinguishing surface, and more effectively absorbing the arc heat by the grid, while preventing the arc from being quickly broken down due to a too short path, ensuring that the arc can be sufficiently lengthened and cooled, thereby assisting in improving the arc extinguishing effect.

[0036] The first shell 20 is a cover 200, and the second shell 21 is a seat 210 for supporting the arc extinguishing grid group 3. The purpose of the above design is to clearly define the functional division of the first shell 20 and the second shell 21, and to ensure that the assembly and use of the arc extinguishing chamber module 2 are more in line with actual needs. The first shell 20 is designed as a cover 200, which can conveniently cover the seat 210 to form a closed space, facilitating the opening for installation, inspection or replacement of the arc extinguishing grid group 3; the second shell 21 is designed as a seat 210 for supporting the arc extinguishing grid group 3, which can provide a stable installation foundation for the grid group, ensuring that the grid group maintains the pre-set arrangement form and position during the arc extinguishing process, avoiding the displacement of the grid caused by arc impact or vibration, which affects the effect of the arc extinguishing channel 8, and at the same time, the structural design of the seat 210 can better adapt to the support needs of the arc extinguishing grid group 3, making the structure of the entire arc extinguishing chamber module 2 more reasonable and the functions of the components more clear.

[0037] The inner wall of the seat 210 is provided with a grid fixing structure 11, and the arc extinguishing grid group 3 is supported on the grid fixing structure 11. The grid fixing structure 11 is a plurality of parallel slots 110, and the two side edges of the first grid 30 and the second grid 31 are inserted into the slots 110. The purpose of the above design is to provide accurate and stable installation positioning for the arc extinguishing grid group 3, ensuring that the first grid 30 and the second grid 31 can always maintain the pre-set alternating arrangement form, avoiding the displacement of the grid caused by arc impact or vibration during the arc extinguishing process, which affects the stability of the arc extinguishing channel 8. The slots 110 are long groove-shaped recesses formed on the inner wall of the seat 210, which are shaped to fit the two side edges of the first grid 30 and the second grid 31 and can accommodate the grid edges. In terms of connection, the two side edges of the first grid 30 and the second grid 31 are directly inserted into the corresponding slots 110, and the side walls of the slots 110 limit the grid horizontally and vertically, so that the grid maintains a fixed inclination angle and spacing in the arc extinguishing chamber module 2, which facilitates the quick assembly of the grid group and ensures that the arc extinguishing channel 8 always maintains the pre-set tortuous form, ensuring that the arc can extend and cool along the established path.

[0038] The cover 200 is provided with a pressure relief port 12 in communication with the inside of the arc extinguishing chamber module 2. The purpose of the above design is to release the gas and pressure generated during the arc extinguishing process inside the arc extinguishing chamber module 2, to avoid the damage of the shell or the influence on the arc extinguishing effect caused by the excessive internal pressure. The structure of the pressure relief port 12 is a through hole opened on the cover 200, which can be circular, square or other regular shapes according to the pressure release requirements; in terms of connection, the pressure relief port 12 and the cover 200 are integrally formed, directly penetrating through the thickness direction of the cover 200, so that the internal space of the arc extinguishing chamber module 2 is in communication with the external environment. When the gas generated by arc extinguishing causes the internal pressure to rise, the gas can be smoothly discharged through the pressure relief port 12, maintaining the stability of the internal pressure of the module, while preventing the high-pressure gas from impacting the shell or leaking to other critical component areas of the circuit breaker.

[0039] The first grid 30 and the second grid 31 are the same structure and are alternately arranged in a 180-degree rotational symmetry manner. The purpose of the above design is to simplify the production and assembly process of the arc extinguishing grid set 3, reduce the cost of part management, and at the same time ensure that the first grid 30 and the second grid 31 can accurately form the oppositely inclined arc extinguishing surface. Since the first grid 30 and the second grid 31 are the same structure, only one specification of grid parts needs to be produced, which can be used as the first grid 30 and the second grid 31 by 180-degree rotation, reducing the types of parts and avoiding the problem of confusing assembly of different specifications of grids; alternately arranged in a 180-degree rotational symmetry manner can ensure that the arc extinguishing surfaces of adjacent grids naturally form opposite inclined directions, without the need for additional adjustment of grid structure or assembly angle, so that the preset arc extinguishing channel 8 can be stably formed, ensuring the consistency of arc extinguishing effect, while simplifying the assembly operation steps and improving the assembly efficiency.

[0040] The first arc extinguishing surface 4 and the second arc extinguishing surface 5 are both formed with arc guiding grooves 13. The purpose of the above design is to guide the arc to move along the preset path on the arc extinguishing surface, avoid the arc to drift or escape from the arc extinguishing channel 8 at the edge of the arc extinguishing surface, and ensure that the arc can stably enter and pass through the tortuous arc extinguishing channel 8. The structure of the arc guiding groove 13 is a groove opened on the first arc extinguishing surface 4 and the second arc extinguishing surface 5, and the groove body is mostly arc-shaped to form a constraint space for the arc; in terms of connection, the arc guiding groove 13 and the grid body are integrally formed, directly machined on the first arc extinguishing surface 4 of the first grid 30 and the second arc extinguishing surface 5 of the second grid 31, without the need for additional assembly parts, which can guide the arc to extend in the inclined direction through the sidewall of the groove body, and can also reduce the deviation of the arc when contacting the arc extinguishing surface, ensuring that the arc always moves along the predetermined path of the arc extinguishing channel 8, and assisting in maintaining the stability of the arc extinguishing process.

[0041] In the embodiment, when the direct current circuit breaker breaks the circuit or cuts off the fault current, the arc generated by the contact separation enters the inside of the arc extinguishing chamber module 2 under the action of the electric force. The arc extinguishing chamber module 2 is composed of the first shell 20 as the cover body 200 and the second shell 21 as the seat body 210 which are detachably connected to form a closed space, the inner wall of the seat body 210 is provided with a plurality of parallel insertion slots 110, the first grid 30 and the second grid 31 of the arc extinguishing grid set 3 are inserted into the insertion slots 110 to be fixed, the first grid 30 and the second grid 31 are the same in structure and are alternately arranged in a 180-degree rotational symmetry mode, so that the first arc extinguishing surface 4 of the first grid 30 and the second arc extinguishing surface 5 of the second grid 31 are oppositely inclined, the highest edge 9 of the first arc extinguishing surface 4 and the lowest edge 10 of the second arc extinguishing surface 5 are staggered in the vertical direction, and the first arc extinguishing surface 4 and the second arc extinguishing surface 5 are both provided with the arc guiding groove 13 extending in the inclined direction. The arc is guided into the zigzag arc extinguishing channel 8 formed by the arc extinguishing surfaces of the adjacent grids under the guidance of the guiding groove, is forced to extend along the channel to lengthen the path, fully contacts the grids in the process and transmits heat to the grids to cool the grids, the gas generated in the arc extinguishing process is discharged through the pressure relief port 12 on the cover body 200, and finally the arc is extinguished due to energy dissipation.

[0042] The above embodiment is only a preferred embodiment of the utility model, and does not limit the protection scope of the utility model, so that: equivalent changes made according to the structure, shape and principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. A direct current circuit breaker comprising a circuit breaker body (1), characterized in that, Also included are: An arc-extinguishing chamber module (2) configured as a detachable closed structure, comprising a first shell (20) and a second shell (21) detachably connected to each other; An arc-extinguishing grid group (3) provided in the arc-extinguishing chamber module (2), comprising a plurality of first grids (30) and second grids (31) arranged alternately, the first grids (30) having first arc-extinguishing surfaces (4) inclined to a first direction (6), the second grids (31) having second arc-extinguishing surfaces (5) inclined to a second direction (7), the first direction (6) and the second direction (7) being opposite to each other, so that arc-extinguishing channels (8) for elongating electric arcs are formed between the arc-extinguishing surfaces of adjacent grids.

2. The DC circuit breaker according to claim 1, characterized in that The highest edges (9) of the first arc-extinguishing surfaces (4) and the lowest edges (10) of the second arc-extinguishing surfaces (5) are staggered in the vertical direction.

3. The DC circuit breaker according to claim 1, characterized in that The first shell (20) is a cover (200), and the second shell (21) is a seat (210) for supporting the arc-extinguishing grid group (3).

4. The DC circuit breaker according to claim 3, characterized in that A grid fixing structure (11) is provided on the inner wall of the seat (210), and the arc-extinguishing grid group (3) is supported on the grid fixing structure (11).

5. The DC circuit breaker according to claim 3, characterized in that A pressure relief port (12) is provided on the cover (200) and communicates with the inside of the arc-extinguishing chamber module (2).

6. The DC circuit breaker according to claim 4, characterized in that The grid fixing structure (11) is a plurality of parallel insertion slots (110), and the two side edges of the first grids (30) and the second grids (31) are inserted into the insertion slots (110).

7. The DC circuit breaker according to claim 1, characterized in that The first grids (30) and the second grids (31) are structurally identical and are arranged alternately in a 180-degree rotational symmetry manner.

8. The DC circuit breaker according to claim 1, characterized in that Arc guiding grooves (13) are formed on the first arc-extinguishing surfaces (4) and the second arc-extinguishing surfaces (5).

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