Arc extinguish chamber of direct current circuit breaker

Abstract

The arc extinguish chamber comprises an arc extinguish chamber main body and arc extinguish grid sheets embedded in the arc extinguish chamber main body, the upper side of the arc extinguish chamber main body is provided with an opening, so that an arc discharge port is formed in the upper side of the arc extinguish chamber main body, and a left insulating wall and a right insulating wall are fixed on the left side and the right side of the arc extinguish chamber main body. An arc filtering layer is installed on the upper side of the arc extinguish chamber body and covers the arc discharging opening. According to the arc extinguish chamber of the direct current circuit breaker, through the arrangement of the left insulating wall and the right insulating wall, the insulating sealing performance of the arc extinguish chamber can be simply and effectively improved, the situation of electric arc omission is reduced, and the arc extinguish performance is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a direct current circuit breaker, more specifically to a direct current circuit breaker's arc extinguishing chamber. BACKGROUND

[0002] The existing direct current circuit breaker (MCB) still has the phenomenon of too long arc burning time and product burning loss when applied in high-voltage direct current environment, and the magnetic field arrangement cannot meet the requirement of non-polarity when the traditional direct current circuit breaker (MCB) uses magnetic blow for arc extinguishing.

[0003] Therefore, the utility model with the publication number CN119092380A and the name of a direct current double-channel arc extinguishing structure of circuit breaker discloses a method of setting a magnetic conducting block on the arc leading angle to divide the arc running track into two strong magnetic channels with opposite magnetic forces, so as to realize double channels to make the arc in both directions be subjected to the magnetic blow force in the direction of the arc extinguishing chamber, but the arc extinguishing chamber of the structure only has two side plates covering the two sides of the arc extinguishing grid piece, and the connecting point of the arc extinguishing grid piece penetrates the side plate, so that the arc is easy to be missed from the connecting point in the arc extinguishing process, thereby causing the problem of poor arc extinguishing effect of the arc extinguishing chamber in the prior art. SUMMARY

[0004] In view of the deficiencies in the prior art, the utility model aims to provide an arc extinguishing chamber of a direct current circuit breaker with better arc extinguishing effect.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: an arc extinguishing chamber of a direct current circuit breaker, comprising an arc extinguishing chamber main body and a plurality of arc extinguishing grid pieces embedded in the arc extinguishing chamber main body, the upper side of the arc extinguishing chamber main body is provided with an opening to form an arc discharge port on the upper side of the arc extinguishing chamber main body, characterized in that: left and right insulating walls are fixed on the left and right sides of the arc extinguishing chamber main body, and an arc filtering layer is installed on the upper side of the arc extinguishing chamber main body, which covers the arc discharge port.

[0006] As a further improvement of the utility model, mounting through holes are formed on the corners of the left and right insulating walls, nuts are embedded in the mounting through holes of the left insulating wall, and screws are embedded in the mounting through holes of the right insulating wall, the screws are threadedly connected with the nuts after penetrating through the two mounting through holes, so as to splice and fix the left and right insulating walls and accommodate the arc extinguishing chamber main body.

[0007] As a further improvement of the utility model, the upper side of the left insulation wall is arranged with a plurality of left splicing strips arranged at intervals, the upper side of the right insulation wall is arranged with a plurality of right splicing strips arranged at intervals, the left splicing strip and the right splicing strip are arranged one by one to form a grid structure when the left insulation wall and the right insulation wall are spliced and fixed, the end of the left splicing strip and the right splicing strip are connected to form a grid structure, and the arc filtering layer is accommodated in the grid structure, so that the arc filtering layer is between the grid structure and the arc discharge port.

[0008] As a further improvement of the utility model, the arc extinguishing chamber body comprises an insulation cover, a left insulation plate and a right insulation plate, a plurality of arc extinguishing grid pieces are installed in the space enclosed by the insulation cover, the left insulation plate and the right insulation plate, the left insulation plate and the right insulation plate are provided with bottom installation holes and classified installation holes, the installation holes on the bottom installation holes are arranged in a straight line, the installation holes on the classified installation holes are divided into a plurality of straight lines staggered with each other according to different arc extinguishing grid pieces, and the side edges of the plurality of arc extinguishing grid pieces are provided with bottom installation blocks corresponding to the bottom installation holes and classified installation blocks corresponding to the classified installation holes.

[0009] As a further improvement of the utility model, the left insulation plate and the right insulation plate are provided with hook grooves near the upper side edges, the left and right side edges of the insulation cover are provided with hooks, and the hooks are embedded in the hook grooves to form a containing groove structure with the left insulation plate, the right insulation plate and the insulation cover.

[0010] As a further improvement of the utility model, the lower side edges of the plurality of arc extinguishing grid pieces are provided with containing grooves for containing external moving contacts, the width of the groove opening to the groove bottom of the containing groove gradually increases, and the side edges of the left insulation plate and the right insulation plate are fixed with gas generating blocks.

[0011] The utility model discloses the beneficial effect, through the setting of arc extinguishing chamber body and arc extinguishing grid piece, can effectively form the structure of an arc extinguishing chamber, and through the mode that the left insulation wall and the right insulation wall are fixed on the left and right sides of arc extinguishing chamber body, the connecting point of arc extinguishing grid piece can be contained by the left insulation wall and the right insulation wall, thereby realizing the condition that arc is avoided from the connecting point. ACCURATE DRAWING

[0012] Figure 1 It is the internal structure schematic diagram of the circuit breaker of the arc extinguishing chamber of the direct current circuit breaker of the utility model

[0013] Figure 2 It is the structure schematic diagram of the arc extinguishing chamber of the direct current circuit breaker of the utility model

[0014] Figure 3 It is Figure 2 The structure schematic diagram of the arc extinguishing chamber body

[0015] Figure 4 For Figure 3 The structure diagram of the arc extinguishing grid piece;

[0016] Figure 5 For Figure 2 The end face perspective view of the arc extinguishing chamber body. DETAILED DESCRIPTION

[0017] The utility model will be made further detailed below with the embodiment shown in the accompanying drawings.

[0018] Referring to Figures 1 to 5 The arc extinguishing chamber of the direct current circuit breaker of the embodiment, comprising an arc extinguishing chamber body 1 and a plurality of arc extinguishing grid pieces 2 embedded in the arc extinguishing chamber body 1, the upper side of the arc extinguishing chamber body 1 is provided with an opening to form an arc discharge port on the upper side of the arc extinguishing chamber body 1, characterized in that: the left and right sides of the arc extinguishing chamber body 1 are fixed with a left insulating wall 3 and a right insulating wall 4, and the upper side of the arc extinguishing chamber body 1 is installed with an arc filter layer 5, which is arranged to cover the arc discharge port, in the process of using the arc extinguishing chamber of the embodiment, only need to be installed into the external circuit breaker shell, then make the static contact and the moving contact arranged in the arc extinguishing chamber body 1, so as to realize the effect of arc extinguishing, and the left insulating wall 3 and the right insulating wall 4 are arranged, which can effectively increase the sealing performance of the two sides of the arc extinguishing chamber, and prevent the arc from creeping out from the two sides of the metal grid piece to cause breakdown, and improve the insulation performance of the arc extinguishing chamber.

[0019] In the embodiment, the number of arc extinguishing grid pieces 2 is maximized, therefore, the external arc plate is adopted to fix the arc plate to the external base, so as to increase the number of arc extinguishing grid pieces in the arc extinguishing chamber body 1, for specific reference. Figure 1

[0020] Further, in the embodiment, the bolt and nut butt joint is adopted to realize the installation of the left insulating wall 3 and the right insulating wall 4, as follows: the installation through hole 6 is formed on the corners of the left insulating wall 3 and the right insulating wall 4, the nut is embedded in the installation through hole 6 of the left insulating wall 3, and the screw is embedded in the installation through hole 6 of the right insulating wall 4, the screw is threadedly connected with the nut after penetrating through the two installation through holes 6, so as to splice and fix the left insulating wall 3 and the right insulating wall 4, and accommodate the arc extinguishing chamber body 1, so it can be seen that the splicing and installation of the left insulating wall 3 and the right insulating wall 4 can be realized simply and quickly.

[0021] ​Further, the embodiment provides a grid structure combined by the left insulation wall 3 and the right insulation wall 4, which is used to provide a gas-permeable window, and can be realized by mainly adopting the way of butt joint of the end of the left splicing strip 31 and the right splicing strip 41. The shapes of the left splicing strip 31 and the right splicing strip 41 in the embodiment are both long strip prisms, which can realize the plane structure of the inner and outer sides of the grid structure after splicing, and thus better accommodate the arc filtering layer 5. Further, the embodiment provides the structure of the arc-extinguishing chamber main body 1, which comprises an insulation cover 11, a left insulation plate 12 and a right insulation plate 13. A plurality of arc-extinguishing grid pieces 14 are installed in the space enclosed by the insulation cover 11, the left insulation plate 12 and the right insulation plate 13. The left insulation plate 12 and the right insulation plate 13 are provided with bottom installation row holes 15 and classified installation row holes 16. The installation holes on the bottom installation row holes 15 are arranged in a straight line. The installation holes on the classified installation row holes 16 are divided into a plurality of mutually staggered straight lines according to the different classifications of the arc-extinguishing grid pieces 14. The side edges of the plurality of arc-extinguishing grid pieces 14 are provided with bottom installation blocks 141 corresponding to the bottom installation row holes 15 and classified installation blocks 142 corresponding to the classified installation row holes 16. In this way, on the one hand, the two or more metal grid pieces can be used, and the different spacing bosses are arranged on the two or more metal grid pieces. The bosses are clamped on the left insulation plate 12 and the right insulation plate 13, and the grid piece position will not be installed incorrectly. According to the grid piece thickness 1.2 and the spacing 1.8, the number of grid pieces can reach more than 60, which is advantageous for improving the arc voltage. In the embodiment, an arc separation plate is also provided above the arc-extinguishing grid pieces 14, which is provided with staggered gas outlet holes. The airflow between the arc-extinguishing grid pieces 14 is discharged in a staggered manner through the gas outlet holes. The distance between the short arcs is increased. This structure can prevent the remaining arc from flying out between the arc-extinguishing grid pieces 14 and breaking down.

[0022] Further, in order to facilitate the self-checking assembly of the left insulation plate 12, the right insulation plate 13 and the insulation cover 11, the insulation cover 11 is provided with a barb in the embodiment. The arc separation plates 6-8 are installed below the insulation cover 11. The barb of the insulation cover 11 is clamped in the left insulation plate 12 and the right insulation plate 12. A arc-extinguishing chamber main body 1 is formed. Further, in the embodiment, the accommodation groove for accommodating the static contact and the moving contact is arranged in a structure with the width gradually increasing from the groove opening to the groove bottom. Meanwhile, the left insulation plate 12 and the right insulation plate 13 are both fixed with a gas production block 17 on the side edge. A narrow channel is formed in the middle of the gas production block 17. The static contact and the moving contact are located in the channel. When the arc is generated, the arc is compressed in the narrow space. The arc diameter becomes thin, the arc voltage is increased, and the arc is extinguished. The gas production block 17 produces gas under the action of arc high temperature, which accelerates the arc cooling and extinguishing. The opening of the space gradually increases from bottom to top. The gas produced by the arc high temperature makes the gas pressure below the space higher than that above the space, which promotes the arc to move upward, so that the arc enters the arc-extinguishing chamber more quickly, and the arc-extinguishing performance is improved.

[0023] In summary, the arc extinguishing chamber of the direct current circuit breaker of the embodiment can effectively enhance the insulation performance of the arc extinguishing chamber, and further reduce the arc missing and enhance the arc extinguishing performance.

[0024] The preferred embodiments of the utility model are described above, the protection scope of the utility model is not only limited to the above-mentioned embodiments, and all technical solutions under the idea of the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary skilled persons in the art, some improvements and decorations without departing from the principle of the utility model are also regarded as the protection scope of the utility model.

Claims

1. An arc extinguishing chamber of a direct current circuit breaker, comprising an arc extinguishing chamber body (1) and a plurality of arc extinguishing vanes (14) embedded in the arc extinguishing chamber body (1), the upper side of the arc extinguishing chamber body (1) is provided with an opening to form an arc discharge port at the upper side of the arc extinguishing chamber body (1), characterized in that: The left and right sides of the arc extinguishing chamber body (1) are fixed with a left insulating wall (3) and a right insulating wall (4), and the upper side of the arc extinguishing chamber body (1) is provided with an arc filtering layer (5) covering the arc discharge port.

2. The arc-quenching chamber of a direct-current circuit breaker according to claim 1, characterized in that: The left and right insulating walls (3) and (4) are provided with mounting through holes (6) at the four corners, the mounting through hole (6) of the left insulating wall (3) is embedded with a nut, and the mounting through hole (6) of the right insulating wall (4) is embedded with a screw, which is screwed with the nut after passing through the two mounting through holes (6) to splice and fix the left and right insulating walls (3) and (4) and accommodate the arc extinguishing chamber body (1) therein.

3. The arc-quenching chamber of a direct-current circuit breaker according to claim 2, characterized in that: The upper side of the left insulating wall (3) is provided with a plurality of left splicing strips (31) arranged at intervals, the upper side of the right insulating wall (4) is provided with a plurality of right splicing strips (41) arranged at intervals, and the left splicing strips (31) and the right splicing strips (41) are arranged one by one to form a grid structure when the left and right insulating walls (3) and (4) are spliced and fixed, and the arc filtering layer (5) is accommodated therein, so that the arc filtering layer (5) is between the grid structure and the arc discharge port.

4. The arc-quenching chamber of a direct-current circuit breaker according to claim 3, characterized in that: The arc extinguishing chamber body (1) comprises an insulating cover (11), a left insulating plate (12) and a right insulating plate (13), a plurality of arc extinguishing grid fins (14) are installed in the space enclosed by the insulating cover (11), the left insulating plate (12) and the right insulating plate (13), the left insulating plate (12) and the right insulating plate (13) are provided with bottom mounting holes (15) and classification mounting holes (16), the mounting holes on the bottom mounting holes (15) are arranged in a straight line, and the mounting holes on the classification mounting holes (16) are divided into a plurality of straight lines staggered with each other according to the different arc extinguishing grid fins (14), the side edges of the plurality of arc extinguishing grid fins (14) are provided with a bottom mounting block (141) corresponding to the bottom mounting holes (15) and a classification mounting block (142) corresponding to the classification mounting holes (16).

5. The arc-quenching chamber of a direct-current circuit breaker according to claim 4, characterized in that: The left and right sides of the arc extinguishing chamber body (1) are fixed with a left insulating wall (3) and a right insulating wall (4), and the upper side of the arc extinguishing chamber body (1) is provided with an arc filtering layer (5) covering the arc discharge port.

6. The arc-quenching chamber of a direct-current circuit breaker according to claim 5, characterized in that: The left and right insulating walls (3) and (4) are provided with mounting through holes (6) at the four corners, the mounting through hole (6) of the left insulating wall (3) is embedded with a nut, and the mounting through hole (6) of the right insulating wall (4) is embedded with a screw, which is screwed with the nut after passing through the two mounting through holes (6) to splice and fix the left and right insulating walls (3) and (4) and accommodate the arc extinguishing chamber body (1) therein. The left and right sides of the arc extinguishing chamber body (1) are fixed with a left insulating wall (3) and a right insulating wall (4), and the upper side of the arc extinguishing chamber body (1) is provided with an arc filtering layer (5) covering the arc discharge port.

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