A small circuit breaker

Abstract

The present invention discloses a small circuit breaker, comprising a first housing and a second housing, a fixing plate is provided on the first housing, a fixing sleeve is provided on the fixing plate, a handle, a static contact, and an arc extinguishing cover are provided between the first housing and the second housing, the handle is connected to a transmission mechanism, the transmission mechanism is connected to a moving contact, the arc extinguishing cover comprises a plurality of arc extinguishing grids, a back plate is provided at the tail of the arc extinguishing grid, a limiting hole is provided on the back plate, an adjusting column is provided between the fixing sleeve and the back plate, one end of the adjusting column is threadedly connected to the fixing sleeve, and the other end is movably connected to the limiting hole, after the adjusting rod rotates in the fixing sleeve, its end rotates in the limiting hole and is limited by the limiting hole, thereby driving the arc extinguishing cover to move. The beneficial effect of the present invention is that the position of the arc extinguishing cover can be adjusted according to the specific use scenario of the circuit breaker to improve the arc extinguishing effect.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit breakers, and in particular relates to a miniature circuit breaker. Background Art

[0002] A miniature circuit breaker is a device used to protect electrical circuits and equipment from overload and short circuit damage. It monitors the current and automatically cuts off the circuit once it detects that the current exceeds its rated value, thereby preventing the wires from overheating or other potential dangers. Currently, miniature circuit breakers are widely used in power distribution systems in homes, companies, and shopping malls.

[0003] When the moving contact and the static contact inside the small circuit breaker are separated, an arc will be generated. The high temperature generated by the arc will damage the insulating material inside the circuit breaker and increase the risk of short circuit. At the same time, the arc discharge will also generate strong electromagnetic pulses, which will interfere with nearby electronic equipment and affect their normal operation. To solve these problems, it is usually necessary to set an arc extinguishing hood inside the circuit breaker. After the arc is generated and enters the arc extinguishing hood, it will be divided and cooled by the arc extinguishing grid and quickly extinguished.

[0004] In actual use, the distance between the arc extinguishing hood and the moving contact and the static contact is a key factor affecting the arc extinguishing effect. When the arc extinguishing hood is too close, the arc is easily disturbed by the circuit breaker's breaking process, becoming less stable and prone to insufficient arc extinguishing. In addition, a too close arc extinguishing hood distance may also cause arc splashes to directly pass through the arc extinguishing hood; when the arc extinguishing hood is too far, it means that the distance between the arc and the arc extinguishing grid increases, resulting in the arc failing to quickly contact the arc extinguishing grid after it is generated and being separated and cooled, prolonging the existence time of the arc, thereby increasing the arc extinguishing time.

[0005] Depending on the working voltage or usage scenario connected to the circuit breaker, the optimal distance between the arc extinguishing hood and the moving contact and the static contact will also change accordingly. However, in existing small circuit breakers, the position of the arc extinguishing hood inside is pre-set and cannot be changed. Operators cannot achieve the best arc extinguishing effect by adjusting the position of the arc extinguishing hood. Summary of the invention

[0006] In the existing small circuit breaker, the distance between the arc extinguishing hood and the moving contact and the static contact inside the arc extinguishing hood cannot be adjusted, and the arc extinguishing effect of the arc extinguishing hood cannot be optimized according to the actual working voltage and usage scenario of the small circuit breaker. For this purpose, the following invention is proposed:

[0007] A small circuit breaker comprises a first shell and a second shell, a handle, a static contact and an arc extinguishing cover are arranged between the first shell and the second shell, the handle is connected to a transmission mechanism, the transmission mechanism is connected to a moving contact, a plurality of arc extinguishing grids are arranged in the arc extinguishing cover, a wall plate is fixedly installed on both sides of the arc extinguishing grid, a back plate located outside the tail of the arc extinguishing grid is fixedly arranged between the wall plates, an opening facing the static contact is arranged at the head of the arc extinguishing grid, a limiting hole is arranged on the back plate, a fixing plate is also arranged on the first shell, a fixing sleeve is arranged on the fixing plate, an adjusting column is arranged between the fixing sleeve and the back plate, one end of the adjusting column is threadedly connected to the fixing sleeve, and the other end is movably connected to the limiting hole, after the adjusting rod is rotated in the fixing sleeve, the end portion of the adjusting rod rotates in the limiting hole and is limited by the limiting hole, thereby driving the arc extinguishing cover to move horizontally.

[0008] The back plate is also provided with a through slot, the limiting hole is connected with the slot, one end of the adjusting column inserted into the limiting hole is provided with an annular groove connected with the slot, the first plug plate and the second plug plate are fixedly inserted in the slot and are located at the upper and lower sides of the limiting hole, the first plug plate and the second plug plate are respectively provided with a first clamping head and a second clamping head, and the first clamping head and the second clamping head are formed with a clamping hole that is movably engaged with the annular groove. The clamping hole is movably engaged with the annular groove, and during the rotation of the adjusting column, the adjusting column also rotates in the limiting hole, which will not drive the back plate to rotate, but will drive the back plate to move horizontally, so that the arc extinguishing cover also moves horizontally.

[0009] A guide plate and a limit plate at the bottom of the guide plate are also provided on the wall plate, and guide grooves matching the guide plates are provided on both sides of the back plate. During the fixed connection between the back plate and the wall plate, the guide grooves move from top to bottom along the guide plate, and finally the back plate contacts the limit plate.

[0010] A matching groove is provided at the openings on the upper and lower sides of the slot, and the first plug board and the second plug board are both provided with matching plates that are inserted into the matching grooves. When the first plug board and the second plug board are inserted into the slot, the matching plates match the matching grooves, which means that the plug boards are inserted into place.

[0011] A connection terminal is also provided between the first shell and the second shell. The connection terminal is provided with a terminal hole connected to the outside world. The fixing sleeve is connected to the terminal hole to allow one end of the adjustment column to contact the outside world.

[0012] The end of the adjusting column that contacts the outside is provided with a cross groove, and the adjusting column can be screwed in or out directly from the outside by using a tool that matches the cross groove.

[0013] An upper baffle and an arc baffle are respectively provided at the top and bottom of the arc extinguishing cover, the upper baffle blocks the first plug-in plate from escaping from the slot, and the arc baffle blocks the second plug-in plate from escaping from the slot. The arc baffle is provided with an arc-strike plate extending toward the moving contact. After the arc is generated, it enters above the arc baffle through the arc-strike plate and is divided by the arc extinguishing grid.

[0014] The back plate is provided with a plurality of first through holes, and the first plug plate and the second plug plate are provided with a plurality of second through holes connected to the first through holes. The hole-shaped structure after the first through holes and the second through holes are connected allows air to flow through the arc extinguishing cover and take away the heat generated by the arc.

[0015] The present invention proposes a small circuit breaker, wherein an arc extinguishing hood is arranged inside the small circuit breaker, comprising an arc extinguishing grid and a back plate on which the tail of the arc extinguishing grid is fixedly arranged, an adjusting column is arranged between the back plate and a fixing sleeve arranged on a first shell, one end of the adjusting column is threadedly connected to the fixing sleeve, and the other end is connected to a movable limit connection of the back plate, and the position of the arc extinguishing hood can be quickly adjusted by screwing the adjusting column in and out, and an operator can also select a suitable setting position of the arc extinguishing hood according to actual needs to achieve the best arc extinguishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of a small and medium-sized circuit breaker of the present invention;

[0017] Figure 2 It is a schematic diagram of the internal structure of a small and medium-sized circuit breaker of the present invention;

[0018] Figure 3 It is a side view structural schematic diagram of a small and medium-sized circuit breaker of the present invention;

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the arc extinguishing cover in the present invention;

[0020] Figure 5 It is a partial structural schematic diagram of the arc extinguishing cover in the present invention;

[0021] Figure 6 It is a schematic diagram of the combination of the backplane and the plugboard in the present invention;

[0022] Figure 7 It is a schematic diagram of the combination of the adjustment column and the plug plate in the present invention;

[0023] Figure 8 It is a schematic diagram of the three-dimensional structure of the back plate in the present invention.

[0024] The corresponding relationship between the illustrations and component names in the figure is as follows:

[0025] 1. First shell; 2. Second shell; 3. Arc extinguishing cover; 4. Adjusting column; 5. First plug board; 6. Second plug board; 7. Upper baffle plate; 8. Wiring terminal; 11. Handle; 12. Transmission mechanism; 13. Moving contact; 14. Static contact; 15. Arc striking piece; 16. Fixed plate; 17. Fixed sleeve; 18. Arc baffle plate; 31. Arc extinguishing grid; 32. Wall plate; 33. Back plate; 34. Limiting hole; 35. Slot; 36. Guide plate; 37. Guide groove; 38. Matching groove; 39. Limiting plate; 40. First through hole; 41. Annular groove; 42. Cross groove; 51. First clamp; 52. Clamping hole; 53. Matching plate; 54. Second through hole; 61. Second clamp; 81. Terminal hole. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be clearly and completely described below in conjunction with embodiments.

[0027] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work should fall within the scope of protection of this application.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so as to describe the embodiments of the present application described herein.

[0029] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0030] In addition to being used to indicate a position or location relationship, some of the above terms may also be used to indicate other meanings. For example, the term "on" may also be used to indicate a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0031] like Figure 1-Figure 5As shown, it is a preferred embodiment of the present invention, a miniature circuit breaker, including a first housing 1 and a second housing 2, between which a handle 11, a transmission mechanism 12, a static contact 14, a moving contact 13, an arc extinguishing cover 3, and a terminal 8 are arranged, the handle 11 is connected to the transmission mechanism 12, the transmission mechanism 12 is connected to the moving contact 13, the arc extinguishing cover 3 includes an arc extinguishing grid 31, a wall plate 32, and a back plate 33, the arc extinguishing grid 31 is divided into a head and a tail, wherein the head is facing the static contact 14 A V-shaped opening is formed, and a wall plate 32 is fixedly provided on each side of the arc extinguishing grid 31. A back plate 33 located on the outer side of the tail of the arc extinguishing grid 31 is fixedly provided between the wall plates 32. After the handle 11 is rotated, the transmission mechanism 12 drives the moving contact 13 to rotate and contact with the static contact 14. After the handle 11 is rotated in the opposite direction, the transmission mechanism 12 drives the moving contact 13 to rotate and separate from the static contact 14. The arc generated by the contact or separation between the moving contact 13 and the static contact 14 will enter the arc extinguishing cover 3, and will be divided and cooled by the arc extinguishing grid 31 and extinguished.

[0032] Furthermore, a vertically extending fixing plate 16 is provided on the first shell 1, a fixing sleeve 17 is provided on the fixing plate 16, an adjusting column 4 is provided between the fixing sleeve 17 and the back plate 33, a limiting hole 34 located on the same axis as the fixing sleeve 17 is provided on the back plate 33, one end of the adjusting column 4 is threadedly connected to the fixing sleeve 17, and the other end is movably and limitatively connected to the limiting hole 34.

[0033] After the arc extinguishing cover 3 is installed, the adjusting column 4 is threadedly connected to the fixing sleeve 17. The adjusting column 4 can be moved horizontally by screwing the adjusting column 4 in or out of the fixing sleeve 17. Since the end of the adjusting column 4 is movably connected to the limiting hole 34 on the back plate 33, the rotation of the adjusting column 4 will not drive the back plate 33 to rotate, and since the end of the adjusting column 4 is also limitedly connected to the limiting hole 34, the horizontal movement of the adjusting column 4 will also drive the arc extinguishing cover 3 to move horizontally. The technicians can test the arc extinguishing effects of different positions of the arc extinguishing cover 3 in different usage scenarios in advance to facilitate subsequent use.

[0034] Specifically, Figure 6-Figure 8As shown, a vertically penetrating slot 35 is further provided on the back plate 33, the limiting hole 34 is connected to the slot 35, an annular groove 41 is provided on one end of the adjusting column 4 inserted into the limiting hole 34, the annular groove 41 is connected to the slot 35, and a first plug plate 5 and a second plug plate 6 are fixedly inserted in the slot 35, the first plug plate 5 is located on the upper side of the limiting hole 34, the second plug plate 6 is located on the lower side of the limiting hole 34, the first plug plate 5 is provided with a first clamp 51, and the second plug plate 6 is provided with a first clamp 52. A second clamping head 61 is provided. After the first plug plate 5 and the second plug plate 6 are fully inserted into the slot 35, the first clamping head 51 and the second clamping head 61 will contact each other, and a clamping hole 52 with a radius smaller than the limiting hole 34 is formed therebetween. The annular groove 41 is movably engaged with the clamping hole 52. After the adjusting column 4 is screwed in and out, the annular groove 41 rotates in the clamping hole 52 and contacts the clamping hole 52 to drive the back plate 33 to move, thereby realizing a movable limiting connection between the adjusting column 4 and the back plate 33.

[0035] Furthermore, if Figure 5 As shown, the wall plate 32 is also provided with a guide plate 36 and a stop plate 39 at the bottom of the guide plate 36, and the back plate 33 is provided with guide grooves 37 matching the guide plate 36 on both sides. When installing, it is only necessary to place the back plate 33 above the wall plate 32, and align the guide grooves 37 with the guide plate 36 and move downward until the back plate 33 contacts the stop plate 39, so as to complete the fixed connection of the back plate 33. Furthermore, a matching groove 38 is respectively provided at the openings on the upper and lower sides of the slot 35, and a matching plate 53 is provided on the first plug plate 5 and the second plug plate 6. After the end of the stop column is inserted into the stop hole 34, the first plug plate 5 or the second plug plate 6 is inserted into the slot 35 in a matching manner. When the matching plate 53 is fully matched with the matching groove 38, it means that the plug plate is inserted in place.

[0036] like Figure 2 As shown, in this embodiment, the wiring terminals 8 are provided with two, each of which is provided with a terminal hole 81 connected to the outside, and the fixing sleeve 17 is connected to the terminal hole 81 of one of the wiring terminals 8, so that one end of the adjustment column 4 is also in contact with the outside; further, as Figure 3 As shown, the end of the adjusting column 4 that contacts the outside world is provided with a cross groove 42. When the terminal block 8 is not connected, the adjusting column 4 can be quickly screwed in and out from the outside using a tool that is compatible with the cross groove 42, so as to achieve the purpose of adjusting the position of the arc extinguishing cover 3. After the terminal block 8 is connected, the cross groove 42 will be separated from the outside world.

[0037] In this embodiment, if Figure 2As shown, an upper baffle 7 and an arc baffle 18 are respectively provided on the top and bottom of the arc extinguishing cover 3. When the arc extinguishing cover 3 moves or the adjusting column 4 is screwed in, the upper baffle 7 and the arc baffle 18 respectively prevent the first plug-in plate 5 and the second plug-in plate 6 from being separated from the slot 35. The arc baffle 18 is also provided with an arc-shaped arc-starting piece 15 extending toward the moving contact 13. After the arc extinguishing cover 3 moves, the arc-starting piece 15 can always guide the arc to the top of the arc baffle 18 and finally enter the arc extinguishing cover 3. In addition, as shown in FIG. Figure 6 As shown, a plurality of first through holes 40 are also provided on the back plate 33, and a plurality of second through holes 54 connected to the first through holes 40 are provided on the first plug plate 5 and the second plug plate 6. The hole-like structure composed of the first through holes 40 and the second through holes 54 connects the gaps between the arc-extinguishing grid plates 31 with the outside world to ensure that the air can smoothly pass through the arc-extinguishing cover 3 and take away the arc heat.

[0038] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A miniature circuit breaker, comprising a first housing (1) and a second housing (2), wherein a handle (11), a stationary contact (14), and an arc extinguishing hood (3) are provided between the first housing (1) and the second housing (2), wherein the handle (11) is connected to a transmission mechanism (12), and the transmission mechanism (12) is connected to a moving contact (13), and a plurality of arc extinguishing grids (31) are provided in the arc extinguishing hood (3), and the heads of the arc extinguishing grids (31) are provided with openings facing the stationary contact (14), and characterized in that: A wall plate (32) is fixedly mounted on each side of the arc extinguishing grid (31); a back plate (33) located outside the rear end of the arc extinguishing grid (31) is fixedly mounted between the wall plates (32); a limiting hole (34) is provided on the back plate (33); a fixing plate (16) is further provided on the first housing (1); a fixing sleeve (17) is provided on the fixing plate (16); an adjusting column (4) is provided between the fixing sleeve (17) and the back plate (33); one end of the adjusting column (4) is threadedly connected to the fixing sleeve (17); and the other end is movably connected to the limiting hole (34); after the adjusting column (4) rotates in the fixing sleeve (17), its end rotates in the limiting hole (34) and is limited by the limiting hole (34), thereby driving the arc extinguishing cover (3) to move; The back plate (33) is also provided with a through slot (35), the limiting hole (34) is connected to the slot (35), one end of the adjusting column (4) inserted into the limiting hole (34) is provided with an annular groove (41) connected to the slot (35), a first plug plate (5) and a second plug plate (6) located at the upper and lower sides of the limiting hole (34) are fixedly inserted into the slot (35), a first clamping head (51) and a second clamping head (61) are respectively provided on the first clamping head (51) and the second clamping head (61), and a clamping hole (52) is formed on the first clamping head (51) and the second clamping head (61) to be movably engaged with the annular groove (41).

2. The miniature circuit breaker according to claim 1, characterized in that: A guide plate (36) and a limit plate (39) located at the bottom of the guide plate (36) are also provided on the wall plate (32), and guide grooves (37) matching the guide plate (36) are provided on both sides of the back plate (33).

3. The miniature circuit breaker according to claim 2, characterized in that: A matching groove (38) is also provided at the openings on the upper and lower sides of the slot (35), and a matching plate (53) is provided on the first plug plate (5) and the second plug plate (6) to be inserted into the matching groove (38).

4. The miniature circuit breaker according to claim 1, characterized in that: A wiring terminal (8) is also provided between the first housing (1) and the second housing (2), the wiring terminal (8) being provided with a terminal hole (81) connected to the outside, and the fixing sleeve (17) being connected to the terminal hole (81) so that one end of the adjusting column (4) is in contact with the outside.

5. The miniature circuit breaker according to claim 4, characterized in that: The end of the adjustment column (4) in contact with the outside world is provided with a cross groove (42).

6. The miniature circuit breaker according to claim 1, characterized in that: An upper baffle (7) and an arc baffle (18) are respectively provided at the top and bottom of the arc extinguishing cover (3); the arc baffle (18) is also provided with an arc striking piece (15) extending toward the moving contact (13).

7. The miniature circuit breaker according to claim 1, characterized in that: The back plate (33) is provided with a plurality of first through holes (40) extending therethrough, and the first plug plate (5) and the second plug plate (6) are provided with a plurality of second through holes (54) extending therethrough and communicating with the first through holes (40).

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