Circuit breaker

Abstract

A circuit breaker belongs to the technical field of low-voltage apparatuses. Comprising a base, a tripping mechanism, an operating mechanism and a traction rod, a mounting hole is formed in the draw bar, a hinge shaft penetrates through the mounting hole and hinge holes of a pair of clamping plates of the operating mechanism to enable the draw bar to be hinged to the operating mechanism, and a first matching portion is arranged at one end of the draw bar. A deformable first limiting part is arranged at the position, corresponding to the first matching part and close to the opening, of the insulating part, one end of the mounting hole of the traction rod is closed after the insulating part is mounted to the first matching part, and meanwhile the first limiting part is matched with the first matching part to fix the insulating part. The circuit breaker has the advantages of simple structure, convenience in installation and replacement of insulation parts, good sealing performance and improvement of the insulation protection capability of the circuit breaker.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and in particular relates to a circuit breaker. Background Art

[0002] As is known in the industry, molded case circuit breakers are indispensable protective devices in low-voltage power distribution systems. They can not only connect and disconnect normal load current and overload current, but also connect and disconnect short-circuit current, that is, they can quickly and automatically cut off the fault current when a circuit fault occurs.

[0003] Molded case circuit breakers usually include functional mechanisms such as contact arc extinguishing system, operating mechanism and tripping mechanism, and many parts span across several phases of the circuit breaker. When moving, these parts spanning the phases must be flexible and have necessary insulation performance. The aforementioned typical example is that the traction rod of the structural system of the operating mechanism is a very important component of the lock connected to the structural system of the aforementioned tripping mechanism. It is usually hingedly arranged on the mechanism bracket, and the operating mechanism realizes the closing and opening actions through the cooperation of the traction rod with the lock and the tripping buckle. However, since the aforementioned traction rod is arranged across multiple phases, it is easy to reduce the desired phase-to-phase insulation performance. Therefore, the above problem is usually solved by sealing the traction rod with an insulating component on the traction rod. However, in the existing solution, the insulating component is fixed to the traction rod by glue, which brings the disadvantage of being difficult to disassemble and replace the insulating component after sealing.

[0004] In view of the above situation, it is necessary to reasonably improve the sealing structure on the traction rod of the existing operating mechanism to solve the above problems. For this reason, the applicant has made a useful design, and the technical solution to be introduced below is produced under this background. Utility Model Content

[0005] The utility model aims to provide a circuit breaker, wherein an insulating component is arranged on a traction rod, and the insulating component can be freely disassembled and replaced while sealing the traction rod.

[0006] The purpose of the utility model is achieved in this way. A circuit breaker includes a base, a tripping mechanism, an operating mechanism and a traction rod; a mounting hole is formed on the traction rod, and a hinge shaft passes through the mounting hole and the hinge holes of a pair of clamping plates of the operating mechanism to hinge the traction rod to the operating mechanism, and a first matching portion is provided at one end of the traction rod. The characteristic is that the circuit breaker also includes an insulating component, and a deformable first limiting portion is provided at a position of the insulating component corresponding to the first matching portion close to the opening. After the insulating component is installed to the first matching portion, one end of the mounting hole of the traction rod is closed, and at the same time, the first limiting portion cooperates with the first matching portion to fix the insulating component.

[0007] In a specific embodiment of the utility model, the first limiting portion includes a recess and an elastic protrusion arranged on the outside of the recess, and the elastic protrusion protrudes from the insulating component body; the first matching portion includes an opening that matches the elastic protrusion, and when the insulating component is installed, the elastic protrusion is offset to one side of the recess. When the insulating component is installed in place, the elastic protrusion protrudes out of the opening to fix the insulating component along the axial direction of the traction rod.

[0008] In another specific embodiment of the utility model, the first limiting portion includes a recess and an elastic recess arranged on the outside of the recess and recessed toward the inside of the insulating component; the first matching portion includes a boss matching with the elastic recess, and when the insulating component is installed, the elastic recess is offset to one side of the recess, and when the insulating component is installed in place, the boss probes into the elastic recess to fix the insulating component along the axial direction of the traction rod.

[0009] In another specific embodiment of the utility model, a second limiting portion is provided on the insulating component, and a second matching portion is provided on the inner wall of the corresponding mounting hole on the traction rod, and the second limiting portion is arranged in the second matching portion to prevent the insulating component from rotating in the mounting hole.

[0010] In yet another specific embodiment of the present invention, a receiving portion is provided on the insulating component at one end facing the hinge shaft, and one end of the hinge shaft extends into the receiving portion.

[0011] In another specific embodiment of the utility model, the opening of the first matching portion is a circular opening or a square opening. When the opening is a circular opening, the elastic protrusion is a circular boss corresponding to the opening; when the opening is a square opening, the elastic protrusion is a wedge-shaped boss and the wedge-shaped side is close to the hinge shaft side.

[0012] In a further specific embodiment of the present invention, the boss of the first matching portion is a circular boss or a square boss. When the boss is a circular boss, the elastic recess is a circular groove corresponding to the circular boss; when the boss is a square boss, the elastic recess is a square groove.

[0013] In a more specific embodiment of the present utility model, the second limiting portion is a boss or a groove, and the second matching portion is a groove or a boss matching with the second limiting portion.

[0014] In yet another specific embodiment of the present invention, the recess is a closed groove or an open groove perpendicular to the opening, and the opening of the open groove faces the outside of the mounting hole.

[0015] In yet another specific embodiment of the present invention, the insulating component is made of thermoplastic plastic.

[0016] The utility model adopts the above structure, which has the beneficial effect: an insulating component is arranged on the traction rod, and the insulating component can be freely disassembled and replaced while sealing the traction rod. This technical solution is not only simple in structure and convenient for installation and replacement of the insulating component, but also has good sealing performance, thereby further improving the insulation protection capability of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the assembly of the operating mechanism, base, tripping mechanism and traction rod of the molded case circuit breaker of the utility model;

[0018] Figure 2 It is a schematic diagram of the operating mechanism and the traction rod of the utility model;

[0019] Figure 3 It is a schematic diagram of the assembly of the first embodiment of the traction rod and the insulating component of the utility model;

[0020] Figure 4 It is a cross-sectional view of a first embodiment of the traction rod of the utility model;

[0021] Figure 5 It is a cross-sectional view of a second embodiment of the traction rod of the utility model;

[0022] Figure 6 It is a schematic diagram of the assembly of the second embodiment of the traction rod and the insulating component of the utility model;

[0023] Figure 7 It is a structural diagram of the first embodiment of the insulating part of the utility model;

[0024] Figure 8 It is a structural diagram of a second embodiment of the insulating component of the utility model;

[0025] Fig. 9 This is a structural diagram of the third embodiment of the insulating component of the utility model.

[0026] In the figure: 1. traction rod, 11. mounting hole, 12. first matching part, 13. second matching part, 14. opening, 15. boss; 2. hinge shaft; 3. insulating component, 31. first limiting part, 311. elastic protrusion, 312. recess, 313. elastic cavity, 32. second limiting part, 33. accommodating cavity; 4. operating mechanism, 41. splint; 5. base; 6. release mechanism. DETAILED DESCRIPTION

[0027] The following is a detailed description in the form of embodiments, but the description of the embodiments is not a limitation on the technical solution of the utility model. Any equivalent changes made based on the concept of the utility model that are merely formal but not substantial should be regarded as within the scope of the technical solution of the utility model.

[0028] In the following description, all concepts related to directionality or orientation such as up, down, left, right, front and back refer to the position states of the corresponding drawings, and therefore cannot be understood as special limitations on the technical solutions provided by the present utility model. Example 1

[0029] See also Figure 2 And combined with Figure 1 , shows a molded case circuit breaker, which includes a base 5, a tripping mechanism 6, an operating mechanism 4 and a traction rod 1. The traction rod structure 4 of the utility model is supported between a pair of clamping plates 41 arranged face to face with each other. The traction rod 1 spans multiple phases and is rotatably arranged on the operating mechanism 4 through a hinge shaft 2. The operating mechanism 4 is arranged in the base 5 of the molded case circuit breaker when in use. The function of the traction rod 1 is to drive the operating mechanism 4 of the circuit breaker to open and close, that is, the rotation of the traction rod 1 drives the operating mechanism 4 to move.

[0030] See also Figure 3 , Figure 4 , Figure 7 And combined with Figure 2 , which is the technical point of the utility model and is composed of Figure 7 The material shown is a thermoplastic, preferably nylon insulating component 3; the insulating component 3 is arranged at one end of the traction rod 1, and the traction rod 1 is formed with (can also be called "opened with") a mounting hole 11 for setting the hinge shaft 2, and the hinge shaft 2 passes through the mounting hole 11 and the hinge holes of a pair of clamping plates 41 of the operating mechanism 4 to hinge the traction rod 1 to the operating mechanism 4. Figure 3As shown, in this embodiment, since the insulating component 3 is arranged at one end of the traction rod 1, a first matching portion 12 is arranged at one end of the traction rod 1, and a deformable first limiting portion 31 is arranged at a position close to the opening of the first matching portion 12 of the insulating component 3, after the insulating component 3 is installed to the traction rod 1, one end of the mounting hole 11 of the traction rod 1 is closed, thereby improving the insulation protection capability of the hinge shaft 2. Specifically, the first limiting portion 31 includes a recess 312 and an elastic protrusion 311 arranged outside the recess 312, and the elastic protrusion 311 protrudes from the body of the insulating component 3; the first matching portion 12 includes an opening 14 matched with the elastic protrusion 311, when the insulating component 3 is installed, the elastic protrusion 311 deviates to one side of the recess 312, and when the insulating component 3 is installed in place, the elastic protrusion 311 protrudes out of the opening 14, and fixes the insulating component 3 along the axial direction of the traction rod 1. The insulating component 3 is provided with a second limit portion 32, and the inner wall of the corresponding mounting hole 11 on the traction rod 1 is provided with a second matching portion 13, and the second limit portion 32 is arranged in the second matching portion 13 to prevent the insulating component 2 from rotating in the mounting hole 11. The insulating component 3 is provided with a receiving portion 33 at one end facing the hinge shaft 2, and one end of the hinge shaft 2 is inserted into the receiving portion 33 to limit the axial movement of the hinge shaft 2.

[0031] In this embodiment, the opening 14 of the first matching portion 12 is a square opening, the elastic protrusion 311 is a wedge-shaped boss corresponding to the opening 14, and the wedge-shaped side is close to the side of the hinge shaft 2. The second limiting portion 32 is a boss, and the second matching portion 13 is a groove matched with the second limiting portion 32. The recess 312 is a closed groove perpendicular to the opening 14.

[0032] The insulating component 3 is cylindrical in structure and is inserted into the mounting hole 11 on the traction rod 1 to close the opening of the mounting hole 11 at one end of the traction rod 1 , thereby improving the insulation protection capability of the articulated shaft 2 .

[0033] When the insulating component 3 needs to be removed, the elastic protrusion 311 on the first limiting portion 31 is pressed to elastically deform the first limiting portion 31 and break away from the limiting position of the opening 14 , so that the insulating component 3 can be removed from the traction rod 1 . Example 2

[0034] See also Figure 5 , Figure 6 , Figure 8 And combined with Figure 2, a first matching portion 12 is provided at one end of the aforementioned traction rod 1, and a deformable first limiting portion 31 is provided at a position close to the opening of the aforementioned insulating component 3 corresponding to the first matching portion 12. After the aforementioned insulating component 3 is installed to the aforementioned first matching portion 12, one end of the mounting hole 11 of the traction rod 1 is closed, and at the same time, the aforementioned first limiting portion 31 cooperates with the first matching portion 12 to fix the insulating component 3, thereby improving the insulation protection capability of the hinge shaft 2. Specifically, the aforementioned first limiting portion 31 includes a recess 312 and an elastic recess 313 disposed outside the recess 312 and recessed toward the inside of the insulating component 3; the aforementioned first matching portion 12 includes a boss 15 that cooperates with the elastic recess 313. When the insulating component 3 is installed, the elastic recess 313 is offset to one side of the recess 312. When the insulating component 3 is installed in place, the aforementioned boss 15 penetrates into the elastic recess 313 to fix the insulating component 3 along the axial direction of the traction rod 1. The insulating component 3 is provided with a second limiting portion 32 , and the inner wall of the corresponding mounting hole 11 on the traction rod 1 is provided with a second matching portion 13 . The second limiting portion 32 is arranged in the second matching portion 13 to prevent the insulating component 2 from rotating in the mounting hole 11 .

[0035] In this embodiment, the boss 15 is a circular boss, the elastic recess 313 is a groove, the second position-limiting portion 32 is a groove, and the second matching portion 13 is a boss matching the second position-limiting portion 32. The recess 312 is a closed groove perpendicular to the opening 14.

[0036] When the insulating component 3 needs to be removed, the first limiting portion 31 only needs to be pressed to disengage the elastic cavity 313 from the limiting position of the boss 15 on the traction rod 1 , and the insulating component 3 can be removed from the traction rod 1 . Example 3

[0037] like Fig. 9 As shown, the recess 312 on the insulating component 3 is an open groove parallel to the opening 14, and the opening of the open groove faces the outside of the mounting hole 11. The rest is the same as the description of embodiment 1.

Claims

1. A circuit breaker, comprising a base (5), a tripping mechanism (6), an operating mechanism (4) and a traction rod (1); a mounting hole (11) is formed on the traction rod (1), a hinge shaft (2) passes through the mounting hole (11) and hinge holes of a pair of clamping plates (41) of the operating mechanism (4) to hinge the traction rod (1) on the operating mechanism (4), a first matching portion (12) is provided at one end of the traction rod (1), and the characteristics are: The circuit breaker further comprises an insulating component (3), wherein the insulating component (3) is provided with a deformable first limiting portion (31) at a position corresponding to the first matching portion (12) close to the opening, and after the insulating component (3) is mounted to the first matching portion (12), one end of the mounting hole (11) of the traction rod (1) is closed, and at the same time, the first limiting portion (31) cooperates with the first matching portion (12) to fix the insulating component (3).

2. A circuit breaker according to claim 1, characterized in that: The first limiting portion (31) includes a recess (312) and an elastic protrusion (311) arranged on the outside of the recess (312), and the elastic protrusion (311) protrudes from the insulating component (3) body; the first matching portion (12) includes an opening (14) matching with the elastic protrusion (311), and when the insulating component (3) is installed, the elastic protrusion (311) is offset to one side of the recess (312), and when the insulating component (3) is installed in place, the elastic protrusion (311) protrudes out of the opening (14) to fix the insulating component (3) axially along the traction rod (1).

3. A circuit breaker according to claim 1, characterized in that: The first limiting portion (31) includes a recess (312) and an elastic recess (313) arranged on the outside of the recess (312) and recessed toward the inside of the insulating component (3); the first matching portion (12) includes a boss (15) matching with the elastic recess (313); when the insulating component (3) is installed, the elastic recess (313) is offset toward one side of the recess (312); when the insulating component (3) is installed in place, the boss (15) penetrates into the elastic recess (313) to fix the insulating component (3) axially along the traction rod (1).

4. A circuit breaker according to claim 1, characterized in that: The insulating component (3) is provided with a second limiting portion (32), and the inner wall of the corresponding mounting hole (11) on the traction rod (1) is provided with a second matching portion (13), and the second limiting portion (32) is arranged in the second matching portion (13) to prevent the insulating component (3) from rotating in the mounting hole (11).

5. A circuit breaker according to claim 1, characterized in that: The insulating component (3) is provided with a receiving portion (33) at one end facing the hinge shaft (2), and one end of the hinge shaft (2) extends into the receiving portion (33).

6. A circuit breaker according to claim 2, characterized in that: The opening (14) of the first matching portion (12) is a circular opening or a square opening. When the opening (14) is a circular opening, the elastic protrusion (311) is a circular boss corresponding to the opening (14); when the opening (14) is a square opening, the elastic protrusion (311) is a wedge-shaped boss and one side of the wedge is close to the side of the hinge shaft (2).

7. A circuit breaker according to claim 3, characterized in that: The boss (15) of the first matching portion (12) is a circular boss or a square boss. When the boss (15) is a circular boss, the elastic recess (313) is a circular groove corresponding to the circular boss; when the boss (15) is a square boss, the elastic recess (313) is a square groove.

8. A circuit breaker according to claim 4, characterized in that: The second limiting portion (32) is a boss or a groove, and the second matching portion (13) is a groove or a boss that matches with the second limiting portion (32).

9. A circuit breaker according to claim 2, characterized in that: The recess (312) is a closed groove or an open groove perpendicular to the opening (14), and the opening of the open groove faces the outside of the mounting hole (11).

10. A circuit breaker according to claim 1, characterized in that: The insulating component (3) is made of thermoplastic plastic.

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