Arc extinguish chamber for circuit breaker

Abstract

An arc extinguishing chamber for a circuit breaker comprises two mounting grid plates, arc extinguishing grid sheets and an arc isolating cover, the two mounting grid plates are distributed left and right, a plurality of groups of first slots are arranged on the mounting grid plates, corresponding first pins are arranged on the arc extinguishing grid sheets, and the first pins and the first slots are matched in an inserted and fixed manner, so that the arc extinguishing grid sheets are arranged at a certain inclination; the arc isolation cover is provided with a bottom cover plate used for shielding the bottom side of the arc extinguish chamber and a rear cover plate used for shielding the rear side of the arc extinguish chamber, the bottom cover plate and the rear cover plate are of an integrally-formed plate-sheet-shaped structure, a connecting plate is further attached to the inner side of the rear cover plate, stacked second plug pins are arranged on the two sides of the connecting plate and the two sides of the rear cover plate, an extending convex part is formed at the rear end of the mounting grid plate, and the extending convex part is provided with a through hole. The extending convex part is provided with a second slot, and the second pin and the second slot are matched in an inserted and fixed mode, so that the arc isolating cover, the connecting plate and the mounting grid plate are of an integrated structure. According to the utility model, the modularized installation is convenient, the assembly is simplified, and the overall structure is simple and reasonable.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to an arc extinguishing chamber for a circuit breaker. Background Art

[0002] Molded case circuit breakers are also called device-type circuit breakers. All parts are sealed in a plastic casing. Auxiliary contacts, undervoltage releases, and shunt releases are mostly modularized. Molded case circuit breakers usually include contact systems, arc extinguishing systems, operating mechanisms, tripping mechanisms, overload protection systems, and short-circuit protection systems. Existing molded case circuit breakers are equipped with arc-isolating parts on the arc-extinguishing chamber to prevent the metal particles melted by the arc from flying out of the arc-extinguishing chamber and entering other mechanisms of the molded case circuit breaker. However, the existing arc-isolating parts adopt a split structure and need to be assembled independently from the arc-extinguishing chamber, which is more troublesome. Utility Model Content

[0003] In view of the shortcomings of the prior art mentioned above, the purpose of the utility model is to provide an arc extinguishing chamber for a circuit breaker which can realize modular installation, simplifies assembly, and has a simple and reasonable overall structure.

[0004] The utility model adopts a technical solution to solve its technical problems. An arc extinguishing chamber for a circuit breaker comprises a mounting grid, an arc extinguishing grid sheet, and an arc shield. The mounting grid is provided with two and distributed in left and right directions. The mounting grid is provided with a plurality of groups of first slots. The arc extinguishing grid sheet is provided with corresponding first pins. The first pins and the first slots are inserted and fixedly matched so that the arc extinguishing grid sheet is arranged at a certain inclination. The arc shield is provided with a bottom cover plate for shielding the bottom side of the arc extinguishing chamber and a rear cover plate for shielding the rear side of the arc extinguishing chamber. The bottom cover plate and the rear cover plate are integrally formed plate-like structures, and a connecting plate is also attached to the inner side of the rear cover plate. The connecting plate and the rear cover plate are provided with stacked second pins on both sides. An extended protrusion is formed at the rear end of the mounting grid. The extended protrusion is provided with a second slot. The second pin and the second slot are inserted and fixedly matched so that the arc shield, the connecting plate, and the mounting grid sheet are an integral structure.

[0005] The advantages of adopting the above technical solution are as follows: by arranging an arc-isolating cover composed of a bottom cover plate and a rear cover plate on the mounting grid, when the circuit breaker is disconnected, the arc is not easy to splash into other mechanisms of the circuit breaker, thereby preventing the partial failure of the movable mechanism during the disconnection process of the circuit breaker, and having higher safety. The rear cover plate and the bottom cover plate are an integrally formed plate-like structure, so it is only necessary to process and manufacture the arc-isolating cover as a whole, and the processing cost of the component is low. The arc-isolating cover cooperates with the second slot on the extended protrusion of the mounting grid through the second pins superimposed on the rear cover plate and the connecting plate, thereby realizing the integrated assembly of the arc-isolating cover, the connecting plate and the mounting grid. Since the arc-isolating cover is relatively thin, it can be quickly and stably installed by setting a connecting plate, and the installation method is also reasonable. Therefore, the arc-extinguishing chamber of this structure is convenient for modular installation, and the assembly is simplified. The overall structure is simple and reasonable.

[0006] Furthermore, the connecting plate is provided with a plurality of through holes for heat dissipation, and the rear cover plate is also cut to form a flippable baffle, which is directly opposite to the through holes.

[0007] The advantages of adopting the above technical solution are as follows: after the arc shield and the connecting plate are installed in place, the relative position of the baffle can be changed by flipping the baffle. Under the premise of effectively blocking the arc from being emitted, the arc extinguishing chamber can achieve a better heat dissipation effect through the through hole, the arc extinguishing chamber is safer to use, and the structural design is reasonable.

[0008] Furthermore, the arc-extinguishing grid includes a plurality of first arc-extinguishing plates and a plurality of second arc-extinguishing plates, the first arc-extinguishing plates are provided with first legs on both sides of the front end, the second arc-extinguishing plates are arranged above the first arc-extinguishing plates and are provided with second legs on both sides of the front end, and the extension length of the first legs is greater than the extension length of the second legs.

[0009] The advantages of adopting the above technical solution are as follows: by providing a first arc-extinguishing plate with a first leg and a second arc-extinguishing plate with a second leg, the arc can be quickly introduced into the arc-extinguishing grid for arc extinguishing, and more arcs are generated at the bottom of the arc-extinguishing chamber, so the length of the first leg is increased, so that the arc at the bottom of the arc-extinguishing chamber can enter the arc-extinguishing chamber more easily, thereby enhancing the arc extinguishing effect and having a reasonable structural design.

[0010] Furthermore, the front ends of the first arc-extinguishing piece and the second arc-extinguishing piece are provided with arc entry grooves matching the corresponding first support leg and the second support leg, the bottom surface of the arc entry groove is set to be a V-shaped surface or a concave arc surface, and a groove is also provided at the lowest point of the arc entry groove.

[0011] The advantages of adopting the above technical solution are as follows: by arranging arc entry grooves with special structures at the front ends of the first arc extinguishing plate and the second arc extinguishing plate, better guidance can be provided for the introduced arc, so that the arc can be better introduced into the arc extinguishing grid for arc extinguishing. The setting of the groove can temporarily store part of the arc that has not been extinguished, thereby avoiding the arc from escaping inside the circuit breaker.

[0012] Furthermore, the arc-extinguishing grid also includes a third arc-extinguishing plate arranged below the first arc-extinguishing plate, and the front end of the third arc-extinguishing plate is also provided with a first arc-starting plate and the first support leg, and the first arc-starting plate is bent downward.

[0013] The advantages of adopting the above technical solution are: by arranging a third arc extinguishing plate below the first arc extinguishing plate, the arc generated at the bottom can be guided more fully and accurately into the arc extinguishing chamber through the first arc-starting plate and the first support leg on the third arc extinguishing plate to achieve arc extinguishing.

[0014] Furthermore, the arc-extinguishing grid also includes a fourth arc-extinguishing plate arranged above the second arc-extinguishing plate, and the front end of the fourth arc-extinguishing plate is also provided with a second arc-starting plate and the second support leg, and the second arc-starting plate is bent downward.

[0015] The advantages of adopting the above technical solution are as follows: by arranging a fourth arc-extinguishing plate above the second arc-extinguishing plate, the arc generated at the top can be guided more fully and accurately into the arc-extinguishing chamber to achieve arc extinguishing through the second arc-starting plate and the second support leg on the fourth arc-extinguishing plate.

[0016] Furthermore, the arc-extinguishing grid also includes a fifth arc-extinguishing plate, which is arranged between the third arc-extinguishing plate and the first arc-extinguishing plate at the bottom, and the fifth arc-extinguishing plate is formed by superimposing two of the first arc-extinguishing plates.

[0017] The advantages of adopting the above technical solution are as follows: by arranging a thicker fifth arc-extinguishing plate at the bottom of the arc-extinguishing chamber, the arcing time at the bottom is long when the switch is opened. Since the fifth arc-extinguishing plate is thicker, it is not easy to burn out, thereby increasing the service life of the arc-extinguishing chamber. In addition, the fifth arc-extinguishing plate is composed of two first arc-extinguishing plates stacked together, so that the types of parts of the arc-extinguishing chamber will not increase, and production is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the arc-extinguishing grid structure of the utility model;

[0020] Figure 3 This is a schematic diagram of the installation grid structure of the utility model;

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

[0022] Figure 5 This is a schematic diagram of the connecting plate structure of the utility model.

[0023] In the figure: 1-arc extinguishing chamber, 2-mounting grid, 3-arc extinguishing grid, 4-arc isolation cover, 5-first slot, 6-first pin, 7-bottom cover plate, 8-rear cover plate, 9-connecting plate, 10-second pin, 11-extended protrusion, 12-second slot, 13-through hole, 14-blocking plate, 15-first arc extinguishing plate, 16-second arc extinguishing plate, 17-first support leg, 18-second support leg, 19-arc entry groove, 20-groove, 21-third arc extinguishing plate, 22-first arc starting plate, 23-fourth arc extinguishing plate, 24-second arc starting plate, 25-fifth arc extinguishing plate. DETAILED DESCRIPTION

[0024] In order to more clearly illustrate the embodiments of the utility model and / or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work. In addition, the orientation only represents the relative position relationship between the components, not the absolute position relationship.

[0025] See also Figures 1 to 5As shown, an arc extinguishing chamber for a circuit breaker includes a mounting grid plate 2, an arc extinguishing grid piece 3, and an arc shield 4, wherein two mounting grid plates 2 are provided and are distributed left and right, and multiple groups of vertically distributed first slots 5 are provided on the two mounting grid plates 2, and the number of groups of the first slots 5 is consistent with the number of arc extinguishing grid pieces 3, and corresponding first pins 6 are provided on the arc extinguishing grid pieces 3. The arc extinguishing grid piece 3 and the mounting grid plate 2 are integrally installed and fixed by the first pins 6 and the first slots 5 through the plug-in cooperation, which generally increases the gap width, facilitates the arc to enter the gap, and is beneficial to the arc extinguishing effect However, increasing the slit width will reduce the number of grids within a certain height, and the arc will not be blocked. Therefore, the first slot 5 is arranged at a certain angle so that the installed arc extinguishing grid 3 is also arranged at a certain angle. In this way, without reducing the number of arc extinguishing grids 3, the ability of the arc to enter the arc extinguishing grid 3 is greatly improved, which has an unexpected effect. The arc shield 4 is provided with a bottom cover plate 7 for shielding the bottom side of the arc extinguishing chamber 1 and a rear cover plate 8 for shielding the rear side of the arc extinguishing chamber 1. This arrangement makes it difficult for the arc to splash onto the circuit breaker when the circuit breaker is disconnected. The bottom cover plate 7 and the rear cover plate 8 are integrally formed plate-shaped structures. With this arrangement, only the arc shield 4 needs to be processed and manufactured as a whole, and the processing cost of the components is low. A connecting plate 9 is also attached to the inner side of the rear cover plate 8. Both sides of the connecting plate 9 and the rear cover plate 8 are provided with stacked second pins 10. An extended protrusion 11 is formed at the rear end of the mounting grid plate 2. A second slot 12 is provided on the extended protrusion 11. The second pin 10 and the second pin 12 are connected to the rear side of the mounting grid plate 2. The slots 12 are inserted and fixedly matched to make the arc shield 4, the connecting plate 9, and the mounting grid 2 an integrated structure, that is, the second pin 10 on the rear cover plate 8 and the second pin 10 on the connecting plate 9 are inserted into the second slot 12 together. This arrangement realizes the integrated assembly of the arc shield 4, the connecting plate 9 and the mounting grid 2. Since the arc shield 4 is relatively thin, fast and stable installation can be achieved by setting the connecting plate 9, and the installation method is also reasonable. Therefore, the arc extinguishing chamber of this structure is convenient for modular installation, and the assembly is simplified. The overall structure is simple and reasonable.

[0026] In this embodiment, a plurality of through holes 13 for heat dissipation are provided on the connecting plate 9, and a reversible baffle 14 is cut on the rear cover plate 8, and the baffle 14 is opposite to the through hole 13. After the arc isolation cover 4 and the connecting plate 9 are installed in place, the baffle 14 can be flipped to change the relative position of the baffle 14. Under the premise of effectively blocking the arc string out, the arc extinguishing chamber 1 can achieve a better heat dissipation effect through the through hole 13, and the arc extinguishing chamber 1 is safer to use and has a reasonable structural design.

[0027] In this embodiment, the arc extinguishing grid 3 includes a plurality of first arc extinguishing plates 15 and a plurality of second arc extinguishing plates 16. First legs 17 are provided on both sides of the front end of the first arc extinguishing plate 15. The second arc extinguishing plate 16 is provided above the first arc extinguishing plate 15 and has second legs 18 on both sides of the front end. The extension length of the first leg 17 is greater than the extension length of the second leg 18. By providing the first arc extinguishing plate 15 with the first leg 17 and the second arc extinguishing plate 16 with the second leg 18, the arc can be quickly introduced into the arc extinguishing grid 3 for arc extinguishing, and more arcs are generated at the bottom of the arc extinguishing chamber 1. Therefore, the length of the first leg 17 is increased, so that the arc at the bottom of the arc extinguishing chamber 1 can be more easily entered into the arc extinguishing chamber 1, thereby enhancing the arc extinguishing effect and having a reasonable structural design.

[0028] In this embodiment, the front ends of the first arc extinguishing sheet 15 and the second arc extinguishing sheet 16 are provided with arc entry grooves 19 matching the corresponding first legs 17 and the second legs 18. The bottom surface of the arc entry grooves 19 is set as a V-shaped surface or a concave arc surface. A groove 20 is also provided at the lowest point of the arc entry grooves 19. By setting arc entry grooves 19 with special structures at the front ends of the first arc extinguishing sheet 15 and the second arc extinguishing sheet 16, better guidance can be provided for the introduced arc, so that the arc can be better introduced into the arc extinguishing grid 3 for arc extinguishing. The setting of the grooves 20 can realize temporary storage of part of the arc that has not been extinguished, thereby avoiding the arc from escaping inside the circuit breaker.

[0029] In this embodiment, the arc extinguishing grid 3 also includes a third arc extinguishing plate 21 arranged below the first arc extinguishing plate 15, and the front end of the third arc extinguishing plate 21 is also provided with a first arc-starting plate 22 and a first support leg 17, and the first arc-starting plate 22 is bent downward. By arranging the third arc extinguishing plate 21 below the first arc extinguishing plate 15, through the first arc-starting plate 22 and the first support leg 17 on the third arc extinguishing plate 21, the arc generated at the bottom can be guided more fully and accurately into the arc extinguishing chamber 1 to achieve arc extinguishing.

[0030] In this embodiment, the arc extinguishing grid 3 also includes a fourth arc extinguishing plate 23 arranged above the second arc extinguishing plate 16, and the front end of the fourth arc extinguishing plate 23 is also provided with a second arc-starting plate 24 and a second support leg 18, and the second arc-starting plate 24 is bent downward. By arranging the fourth arc extinguishing plate 23 above the second arc extinguishing plate, through the second arc-starting plate 24 and the second support leg 18 on the fourth arc extinguishing plate 23, the arc generated at the top can be guided more fully and accurately into the arc extinguishing chamber 1 to achieve arc extinguishing.

[0031] In this embodiment, the arc extinguishing grid 3 also includes a fifth arc extinguishing plate 25, which is arranged between the third arc extinguishing plate 21 and the first arc extinguishing plate 15 at the bottom, and the fifth arc extinguishing plate 25 is formed by stacking two first arc extinguishing plates 15. By arranging a thicker fifth arc extinguishing plate 25 at the bottom of the arc extinguishing chamber 1, when the switch is opened, the arcing time at the bottom is long. Since the fifth arc extinguishing plate 25 is thicker and is not easily burned, the service life of the arc extinguishing chamber 1 is increased. Moreover, the fifth arc extinguishing plate 25 is formed by stacking two first arc extinguishing plates 15, so that the types of parts of the arc extinguishing chamber 1 will not increase, and production is convenient.

[0032] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An arc extinguishing chamber for a circuit breaker, comprising a mounting grid (2), an arc extinguishing grid (3), and an arc shield (4), wherein the mounting grid (2) is provided with two and is distributed in the left and right directions, the mounting grid (2) is provided with a plurality of groups of first slots (5), the arc extinguishing grid (3) is provided with corresponding first pins (6), the first pins (6) and the first slots (5) are inserted and fixedly matched so that the arc extinguishing grid (3) is arranged at a certain inclination, the arc shield (4) is provided with a bottom cover plate (7) for shielding the bottom side of the arc extinguishing chamber (1), and a rear cover plate (8) for shielding the rear side of the arc extinguishing chamber (1), Features: The bottom cover plate (7) and the rear cover plate (8) are integrally formed plate-like structures, and a connecting plate (9) is also attached to the inner side of the rear cover plate (8). The connecting plate (9) and the rear cover plate (8) are provided with stacked second plug pins (10) on both sides. An extended protrusion (11) is formed at the rear end of the mounting grid plate (2). A second slot (12) is provided on the extended protrusion (11). The second plug pin (10) and the second slot (12) are inserted and fixedly matched so that the arc shield (4), the connecting plate (9), and the mounting grid plate (2) are in an integral structure.

2. An arc extinguishing chamber for a circuit breaker according to claim 1, Features: The connecting plate (9) is provided with a plurality of through holes (13) for heat dissipation, and the rear cover plate (8) is also cut to form a flippable baffle (14), wherein the baffle (14) faces the through holes (13).

3. The arc extinguishing chamber for a circuit breaker according to claim 1, Features: The arc extinguishing grid (3) comprises a plurality of first arc extinguishing plates (15) and a plurality of second arc extinguishing plates (16), wherein the first arc extinguishing plates (15) are provided with first legs (17) at both sides of the front end, and the second arc extinguishing plates (16) are arranged above the first arc extinguishing plates (15) and are provided with second legs (18) at both sides of the front end, and the extension length of the first legs (17) is greater than the extension length of the second legs (18).

4. An arc extinguishing chamber for a circuit breaker according to claim 3, Features: The front ends of the first arc-extinguishing piece (15) and the second arc-extinguishing piece (16) are provided with arc entry grooves (19) matching the first supporting leg (17) and the second supporting leg (18) respectively; the bottom surface of the arc entry groove (19) is set as a V-shaped surface or a concave arc surface; and a groove (20) is also provided at the lowest point of the arc entry groove (19).

5. The arc extinguishing chamber for a circuit breaker according to claim 3, Features: The arc-extinguishing grid (3) further comprises a third arc-extinguishing plate (21) arranged below the first arc-extinguishing plate (15); a first arc-starting plate (22) and the first support leg (17) are further arranged at the front end of the third arc-extinguishing plate (21); the first arc-starting plate (22) is bent downward.

6. An arc extinguishing chamber for a circuit breaker according to claim 5, Features: The arc-extinguishing grid (3) further comprises a fourth arc-extinguishing plate (23) arranged above the second arc-extinguishing plate (16); a second arc-starting plate (24) and the second support leg (18) are also arranged at the front end of the fourth arc-extinguishing plate (23); the second arc-starting plate (24) is bent downward.

7. An arc extinguishing chamber for a circuit breaker according to claim 6, Features: The arc-extinguishing grid (3) further comprises a fifth arc-extinguishing plate (25), wherein the fifth arc-extinguishing plate (25) is arranged between the third arc-extinguishing plate (21) and the first arc-extinguishing plate (15) at the bottom, and the fifth arc-extinguishing plate (25) is formed by stacking two of the first arc-extinguishing plates (15).

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