Arc extinguishing device of circuit breaker

Abstract

The utility model discloses a breaker arc extinguishing device, comprising an arc extinguishing cover, the inner side surface of the arc extinguishing cover is provided with a first clamping groove, an arc extinguishing grid sheet is clamped in the first clamping groove, and the middle part of the upper surface of the arc extinguishing grid sheet is provided with a gap. According to the arc extinguishing device of the circuit breaker, through the arrangement of the arc extinguishing grid sheets, the pressure relief grooves, the rubber columns, the baffle plates and the exhaust holes, under the segmentation action of the arc extinguishing grid sheets, an arc is segmented into multiple sections of broken arcs, and meanwhile, the arc extinguishing grid sheets can dissipate heat; heat emitted by the arc extinguishing grid pieces and high-pressure gas generated during arc extinguishing can be discharged to the right side of the arc extinguishing cover through the multiple pressure relief grooves, a part of air pressure is buffered and reduced through the multiple rubber columns, the capacity of resisting electric arcs and air pressure is improved, the electric arcs are effectively prevented from flying out, the multiple exhaust holes are formed in the surface of the baffle, the electric arcs are further prevented from flying out, and the service life of the arc extinguishing cover is prolonged. And the reduced gas is discharged, so that the rapid and efficient pressure reduction of the arc gas in the arc extinguishing chamber is ensured, and the arc extinguishing reliability of the circuit breaker is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to an arc extinguishing device for a circuit breaker. Background Art

[0002] A circuit breaker is a switching device that can close, carry and interrupt current under normal circuit conditions and can close, carry and interrupt current under abnormal circuit conditions within a specified time. During the use of the circuit breaker, in order to reduce the burning of the contacts by the arc and limit the space for the arc to expand, it is generally used together with an arc extinguishing device.

[0003] After searching, Chinese patent publication (announcement) number CN205004294U discloses a molded case circuit breaker arc extinguishing chamber device, which is sequentially provided with an arc extinguishing cover left plate, an arc extinguishing cover right plate, an arc extinguishing grid, a plastic upper plate, a plastic front plate, a plastic inner plate, a convex key, a fixing part and a groove, wherein the arc extinguishing cover right plate is provided on the right side of the arc extinguishing cover left plate, an arc extinguishing grid is installed between the arc extinguishing cover left plate and the arc extinguishing cover right plate, a plastic upper plate is provided on the upper side of the arc extinguishing grid, the plastic upper plate is fixedly connected to the plastic front plate, and a plastic inner plate is installed on the rear side of the plastic front plate, convex keys are provided on both sides of the plastic front plate, and fixing parts and grooves are provided on the outer surfaces of the arc extinguishing cover left plate and the arc extinguishing cover right plate. The molded case circuit breaker arc extinguishing chamber device adds a plastic part to improve the sealing of the arc extinguishing device. When a large current passes through the circuit breaker, a huge energy arc will be generated, and the arc will not cause damage to any parts inside the circuit breaker, thereby improving the protection performance and service life of the circuit breaker.

[0004] Although the above patent can improve the sealing of the arc extinguishing device, the space limitation causes the air pressure inside the arc extinguishing chamber of the circuit breaker to become increasingly higher during the breaking process. The airflow generated by the breaking often causes the shell to burst, and the generated arc continuously consumes the contact system and the arc extinguishing system, resulting in the inability to improve the breaking capacity. It is necessary to ensure the rapid and efficient decompression of the arc gas in the arc extinguishing chamber. Therefore, it is necessary to design a circuit breaker arc extinguishing device to solve the above problems. Utility Model Content

[0005] The main purpose of the utility model is to provide an arc extinguishing device for a circuit breaker, which can effectively solve the problems in the background technology.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A circuit breaker arc extinguishing device comprises an arc extinguishing hood, wherein the inner side surface of the arc extinguishing hood is provided with a first slot, an arc extinguishing grid is clamped inside the first slot, a notch is provided in the middle of the upper surface of the arc extinguishing grid, and a pressure relief groove is provided in the middle of the outer surface of the arc extinguishing hood; both sides of the right side surface of the arc extinguishing hood are fixedly connected with extension plates, one side of the inner side surface of the extension plate is fixedly connected with a rubber column, a second slot is provided at the edge of the inner side surface of the extension plate, a baffle is clamped inside the second slot, and an exhaust hole is provided on the outer surface of the baffle.

[0008] In order to facilitate the fixing of the arc extinguishing grid, as an arc extinguishing device for a circuit breaker of the utility model, both sides of the right side of the arc extinguishing grid are fixedly connected with supporting feet, and a mounting groove is provided on the outer surface of the arc extinguishing cover near the supporting feet.

[0009] In order to achieve the effect of facilitating the connection of the arc extinguishing hood, as an arc extinguishing device for a circuit breaker of the utility model, the outer surface of the arc extinguishing hood is movably connected with a mounting seat, the inner side surface of the mounting seat is fixedly connected with a clamping strip, and a third clamping groove is provided on the side of the outer surface of the arc extinguishing hood close to the clamping strip.

[0010] In order to facilitate the fixing of the arc extinguishing cover, as an arc extinguishing device for a circuit breaker of the utility model, a groove is provided at the top of the inner side of the clamping strip, a spring is fixedly connected inside the groove, one end of the spring is fixedly connected to a limiting column, and a limiting hole is provided on the inner side of the third clamping groove close to the limiting column.

[0011] In order to facilitate the fixing of the device, as an arc extinguishing device for a circuit breaker of the utility model, the lower surface of the mounting seat is fixedly connected to a bottom plate, and positioning holes are provided at the four corners of the upper surface of the bottom plate.

[0012] In order to facilitate the installation of contacts, as an arc extinguishing device for a circuit breaker of the utility model, a first support plate is fixedly connected to one side of the upper surface of the bottom plate, and a bolt is movably connected to the top of the outer surface of the first support plate.

[0013] In order to achieve the effect of facilitating the rotation of the contacts, as an arc extinguishing device for a circuit breaker of the utility model, the middle part of the outer surface of the bolt is rotatably connected with the contact.

[0014] In order to facilitate the effect of limiting the other end of the contact, as an arc extinguishing device for a circuit breaker of the utility model, a second support plate is fixedly connected to the other side of the upper surface of the bottom plate.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. In the utility model, by arranging arc extinguishing grids, pressure relief grooves, rubber columns, baffles and exhaust holes, the arc is divided into multiple broken arcs under the segmentation effect of multiple arc extinguishing grids. At the same time, the arc extinguishing grids will dissipate heat, and the arc will cool down quickly, thereby achieving the effect of arc extinguishing. The heat dissipated by the arc extinguishing grids and the high-pressure gas generated during arc extinguishing will be discharged to the right side of the arc extinguishing cover through multiple pressure relief grooves. Multiple rubber columns will buffer and reduce a part of the gas pressure, increase the ability to resist arc and gas pressure, and effectively prevent the arc from flying out. Multiple exhaust holes are opened on the surface of the baffle to further prevent the arc from flying out, and the reduced gas is discharged to ensure the rapid and efficient decompression of the arc gas in the arc extinguishing chamber, thereby improving the reliability of arc extinguishing of the circuit breaker.

[0017] 2. In the utility model, by setting the mounting seat, spring, limit column and limit hole, the limit column is pressed to shrink it and the spring to the inside of the groove, and then the clamping strip is inserted into the inside of the third clamping slot. The limit column is reset under the elastic action of the spring, and is clamped in the inside of the limit hole, so that the arc extinguishing cover and the mounting seat are limited and fixed, which is convenient for rapid assembly of the device, enhances stability during use, and improves installation efficiency. At the same time, the mounting seat and the arc extinguishing cover form a double protection structure, so that the device can withstand the strong electric field impact generated by the arc. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main structure of an embodiment of the utility model;

[0019] Figure 2 It is a side view structural schematic diagram of an embodiment of the utility model;

[0020] Figure 3 It is a schematic diagram of the cross-sectional plan structure of an embodiment of the utility model;

[0021] Figure 4 This is a schematic diagram of the arc extinguishing cover structure of an embodiment of the utility model;

[0022] Figure 5 This is a schematic diagram of the mounting base structure of an embodiment of the utility model.

[0023] In the figure: 1, arc extinguishing cover; 2, first slot; 3, arc extinguishing grid; 4, notch; 5, pressure relief groove; 6, extension plate; 7, rubber column; 8, second slot; 9, baffle; 10, exhaust hole; 11, support foot; 12, mounting slot; 13, mounting seat; 14, clamping strip; 15, third slot; 16, groove; 17, spring; 18, limit column; 19, limit hole; 20, bottom plate; 21, positioning hole; 22, first support plate; 23, bolt; 24, contact; 25, second support plate. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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] Example

[0026] like Figure 1-5 As shown, an arc extinguishing device for a circuit breaker comprises an arc extinguishing hood 1, a first slot 2 is provided on the inner side surface of the arc extinguishing hood 1, an arc extinguishing grid 3 is clamped inside the first slot 2, a notch 4 is provided in the middle of the upper surface of the arc extinguishing grid 3, and a pressure relief groove 5 is provided in the middle of the outer surface of the arc extinguishing hood 1; both sides of the right side surface of the arc extinguishing hood 1 are fixedly connected with extension plates 6, one side of the inner side surface of the extension plate 6 is fixedly connected with a rubber column 7, a second slot 8 is provided at the edge of the inner side surface of the extension plate 6, a baffle 9 is clamped inside the second slot 8, and an exhaust hole 10 is provided on the outer surface of the baffle 9.

[0027] When in use, through the arrangement of the arc extinguishing grid 3, the pressure relief groove 5, the rubber column 7, the baffle 9 and the exhaust hole 10, the plurality of arc extinguishing grids 3 are evenly connected to the inside of the arc extinguishing cover 1 through the first clamping groove 2. When the circuit breaker is opened, the generated arc drives the contact 24 to rotate a certain angle under the contraction of the magnetic line of force, and the arc is evenly dispersed inside the arc extinguishing cover 1. Under the segmentation effect of the plurality of arc extinguishing grids 3, the arc is divided into multiple segments. When the AC current passes through zero, all short arcs will be extinguished. At the same time, the arc extinguishing grid 3 will dissipate heat, and the arc will cool down quickly, thereby achieving the effect of arc extinguishing, thereby improving the reliability of the device. The notch 4 reduces the arc entering the arc extinguishing cover 1. The resistance during the process, the heat emitted by the arc extinguishing grid 3 and the high-pressure gas generated during the arc extinguishing will be discharged to the right side of the arc extinguishing cover 1 through multiple pressure relief grooves 5. Multiple rubber columns 7 are staggered and fixed between two extension plates 6 to facilitate the discharge of gas. At the same time, a part of the air pressure is buffered and reduced, thereby increasing the ability to resist arc and air pressure, effectively preventing the arc from flying out, and improving the arc extinguishing effect. The baffle 9 is plugged into the inner side of the extension plate 6 through the second card slot 8, which is easy to install and disassemble. A plurality of exhaust holes 10 are provided on the surface of the baffle 9 to further prevent the arc from flying out and discharge the reduced gas, thereby ensuring the rapid and efficient decompression of the arc gas in the arc extinguishing cover 1 and improving the reliability of arc extinguishing of the circuit breaker.

[0028] In this embodiment, legs 11 are fixedly connected to both sides of the right side of the arc-extinguishing grid 3 , and a mounting groove 12 is formed on one side of the outer surface of the arc-extinguishing cover 1 close to the legs 11 .

[0029] During specific use, through the setting of the supporting feet 11, when the arc-extinguishing grid 3 is installed, the two supporting feet 11 on its right side are first bent inward at a certain angle, and then inserted into the inside of the installation groove 12. After the force disappears, the two supporting feet 11 are reset, thereby limiting the arc-extinguishing grid 3, ensuring its firmness during use, and enhancing the impact resistance effect.

[0030] In this embodiment, the outer surface of the arc extinguishing hood 1 is movably connected to a mounting seat 13 , the inner side of the mounting seat 13 is fixedly connected to a clamping strip 14 , and a third clamping groove 15 is provided on one side of the outer surface of the arc extinguishing hood 1 close to the clamping strip 14 .

[0031] During specific use, through the setting of the mounting seat 13, the arc extinguishing cover 1 is installed inside the clamping strip 14 on the inner side of the mounting seat 13 through the third clamping groove 15, making the plug-in more convenient. At the same time, the mounting seat 13 and the arc extinguishing cover 1 form a double protection structure, so that the device can withstand the strong electric field impact generated by the arc.

[0032] In this embodiment, a groove 16 is provided at the top of the inner side of the clamping strip 14, a spring 17 is fixedly connected inside the groove 16, one end of the spring 17 is fixedly connected to a limiting column 18, and a limiting hole 19 is provided on the inner side of the third clamping slot 15 close to the limiting column 18.

[0033] During specific use, through the setting of the limiting column 18 and the limiting hole 19, the limiting column 18 is pressed to shrink it and the spring 17 to the inside of the groove 16, and then the clamping strip 14 is inserted into the inside of the third clamping groove 15. The limiting column 18 is reset under the elastic action of the spring 17, so that it is clamped in the inside of the limiting hole 19, thereby limiting and fixing the arc extinguishing cover 1 and the mounting seat 13, which is convenient for rapid assembly of the device, enhances stability during use, and improves installation efficiency.

[0034] In this embodiment, the bottom surface of the mounting seat 13 is fixedly connected to a bottom plate 20 , and positioning holes 21 are formed at four corners of the top surface of the bottom plate 20 .

[0035] During specific use, through the arrangement of the positioning holes 21 , four groups of positioning holes 21 are opened at the four corners of the upper surface of the bottom plate 20 , which facilitates the installation of the device and ensures the firmness of the installation.

[0036] In this embodiment, a first support plate 22 is fixedly connected to one side of the upper surface of the bottom plate 20 , and a bolt 23 is movably connected to the top of the outer surface of the first support plate 22 .

[0037] During specific use, one end of the contact 24 is placed between the two first support plates 22 by setting the bolt 23, and it is installed by the bolt 23, so that it is more convenient to install and disassemble and easy to maintain.

[0038] In this embodiment, a contact 24 is rotatably connected to the middle portion of the outer surface of the bolt 23 .

[0039] During specific use, through the arrangement of the contact 24 , when the circuit breaker is opened, the other side of the contact 24 is separated from the second support plate 25 , so that the contact 24 rotates a certain angle with the bolt 23 as the center, and the generated arc is introduced into the interior of the arc extinguishing cover 1 .

[0040] In this embodiment, a second support plate 25 is fixedly connected to the other side of the upper surface of the bottom plate 20 .

[0041] During specific use, by setting the second support plate 25, the second support plate 25 limits the other side of the contact 24 to prevent the contact 24 from rotating when the circuit is normal, thereby improving the reliability of the device.

[0042] Working principle: In use, one end of the contact 24 is placed between the two first support plates 22 and installed by the bolt 23. The second support plate 25 limits the other side of the contact 24 to prevent the contact 24 from rotating when the circuit is normal. First, the two legs 11 on the right side of the arc extinguishing grid 3 are bent inward at a certain angle, and then inserted into the inside of the mounting groove 12 along the first slot 2. The baffle 9 is inserted into the inner side of the extension plate 6 through the second slot 8, and the limiting column 18 is pressed to shrink it and the spring 17 to the inside of the groove 16. Then the clamping strip 14 is inserted into the inside of the third slot 15. The limiting column 18 is reset under the elastic action of the spring 17, so that it is clamped in the inside of the limiting hole 19, and the arc extinguishing cover 1 is limited and fixed to the mounting seat 13. When the circuit breaker is opened, the other side of the contact 24 is separated from the second support plate 25, and the generated arc drives the contact 2 under the contraction of the magnetic line of force. 4 is rotated at a certain angle to evenly disperse the arc inside the arc extinguishing hood 1. Under the segmentation effect of multiple arc extinguishing grids 3, the arc is divided into multiple short arcs. When the AC current passes through zero, all short arcs will be extinguished. At the same time, the arc extinguishing grids 3 will dissipate heat, and the arc will quickly cool down, thereby achieving the effect of arc extinguishing. The notch 4 reduces the resistance of the arc when entering the arc extinguishing hood 1. The heat dissipated by the arc extinguishing grids 3 and the high-pressure gas generated when the arc is extinguished will be discharged to the right side of the arc extinguishing hood 1 through multiple pressure relief grooves 5. Multiple rubber columns 7 are staggered and fixed between two extension plates 6 to facilitate gas discharge. At the same time, part of the gas pressure is buffered and reduced, thereby increasing the ability to resist arcs and gas pressure and effectively preventing arcs from flying out. Multiple exhaust holes 10 are opened on the surface of the baffle plate 9 to further prevent arcs from flying out, and the reduced gas is discharged to ensure the rapid and efficient decompression of the arc gas in the arc extinguishing hood 1, thereby improving the reliability of arc extinguishing of the circuit breaker.

[0043] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A circuit breaker arc extinguishing device, comprising an arc extinguishing hood (1), characterized in that: The inner side surface of the arc extinguishing hood (1) is provided with a first clamping groove (2), an arc extinguishing grid (3) is clamped inside the first clamping groove (2), a notch (4) is provided in the middle of the upper surface of the arc extinguishing grid (3), and a pressure relief groove (5) is provided in the middle of the outer surface of the arc extinguishing hood (1); Extension plates (6) are fixedly connected to both sides of the right side of the arc extinguishing cover (1), a rubber column (7) is fixedly connected to one side of the inner side of the extension plate (6), a second slot (8) is provided at the edge of the inner side of the extension plate (6), a baffle (9) is clamped inside the second slot (8), and an exhaust hole (10) is provided on the outer surface of the baffle (9).

2. The circuit breaker arc extinguishing device according to claim 1, characterized in that: Support legs (11) are fixedly connected to both sides of the right side surface of the arc-extinguishing grid (3), and a mounting groove (12) is provided on a side of the outer surface of the arc-extinguishing cover (1) close to the support legs (11).

3. The arc extinguishing device for circuit breaker according to claim 1, characterized in that: The outer surface of the arc extinguishing hood (1) is movably connected to a mounting seat (13), the inner side surface of the mounting seat (13) is fixedly connected to a clamping strip (14), and a third clamping groove (15) is provided on a side of the outer surface of the arc extinguishing hood (1) close to the clamping strip (14).

4. The arc extinguishing device for circuit breaker according to claim 3, characterized in that: A groove (16) is provided at the top of the inner side surface of the clamping strip (14), a spring (17) is fixedly connected inside the groove (16), one end of the spring (17) is fixedly connected to a limiting column (18), and a limiting hole (19) is provided on a side of the inner side surface of the third clamping slot (15) close to the limiting column (18).

5. The arc extinguishing device for circuit breaker according to claim 3, characterized in that: The lower surface of the mounting seat (13) is fixedly connected to a bottom plate (20), and positioning holes (21) are provided at four corners of the upper surface of the bottom plate (20).

6. The arc extinguishing device for circuit breaker according to claim 5, characterized in that: A first support plate (22) is fixedly connected to one side of the upper surface of the bottom plate (20), and a bolt (23) is movably connected to the top of the outer surface of the first support plate (22).

7. The arc extinguishing device for circuit breaker according to claim 6, characterized in that: A contact (24) is rotatably connected to the middle portion of the outer surface of the bolt (23).

8. The arc extinguishing device for circuit breaker according to claim 6, characterized in that: A second support plate (25) is fixedly connected to the other side of the upper surface of the bottom plate (20).

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