A handle structure for a miniature circuit breaker

Abstract

This utility model discloses a handle structure for a miniature circuit breaker. The key technical features include a base and a cover plate, which together form a mounting cavity. An operating mechanism is installed within the mounting cavity, comprising an operating handle and a return spring. One side of the operating handle has a mounting groove for the return spring, and the operating handle is rotatably connected to the base. A sealing plate is provided on the cover plate, and when the cover plate is installed on the base, a gap is left between the sealing plate and the operating handle for the end of the return spring to extend out. The base includes a handle operating surface, with one end of the operating handle extending from the handle operating surface. A limiting plate is provided inside the base, and a limiting groove is left between the limiting plate and the handle operating surface for the return spring to extend into. This handle structure allows for convenient assembly of the spring and handle, improving operational convenience.

Description

Technical Field

[0001] This utility model relates to a circuit breaker, and more specifically, to a handle structure for a miniature circuit breaker. Background Technology

[0002] Miniature circuit breakers (MCBs) are the most widely used terminal protection devices in building electrical terminal distribution equipment. They are mainly used for short circuit, overload, and overvoltage protection of single-phase and three-phase circuits below 125A.

[0003] In the initial stage of production and assembly, the circuit breaker springs need to be installed into the housing (i.e., the circuit breaker base), ensuring that the spring ends fit tightly against the corresponding structures on the housing. However, due to the strong torsional force of the springs, they are prone to bouncing during assembly, which poses a significant assembly difficulty for new operators.

[0004] Furthermore, even if the spring is successfully installed into the housing, there is still a risk that the spring may detach during the period between installing the handle onto the base and before the product is fully riveted. If the spring detaches, the product will be unable to close properly, affecting its functionality.

[0005] In addition, during installation, the spring may shift or not be installed correctly. These problems must be identified and repaired promptly through inspection; otherwise, they may pose safety hazards during product use. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a handle structure for a miniature circuit breaker. This handle structure can be easily assembled with springs and handles, thereby improving the ease of operation.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a handle structure for a miniature circuit breaker, comprising a base and a cover plate, the base and the cover plate forming an installation cavity, an operating mechanism being provided inside the installation cavity, the operating mechanism comprising an operating handle and a return spring, a mounting groove for mounting the return spring being provided on one side of the operating handle, and the operating handle being rotatably connected to the base.

[0008] A sealing plate is provided on the cover plate. When the cover plate is installed on the base, there is a gap between the sealing plate and the operating handle for the end of the reset spring to extend out.

[0009] The base includes a handle operating surface, and one end of the operating handle extends from the handle operating surface;

[0010] A limit plate is installed inside the base, and a limit groove is left between the limit plate and the operating surface of the handle for the reset spring to extend into.

[0011] The present invention is further configured such that: the operating handle includes a handle body, a push block, and a columnar part; the handle body is connected to the upper end of the columnar part; the mounting groove is disposed in the middle of the columnar part; and the push block is disposed on the columnar part.

[0012] The present invention is further configured such that: the push block, the columnar part and the sealing plate surround and form a gap, the gap being located on the side of the columnar part near the handle body;

[0013] A gear set is provided on the side of the columnar part away from the handle body.

[0014] The present invention is further configured such that: an electromagnetic tripping assembly and a motor tripping assembly are provided on the side of the gear set away from the columnar part.

[0015] The present invention is further configured such that: an abutment block is provided on the cover plate, and when the cover plate is installed on the base, the abutment block abuts against the lower end of the limiting plate.

[0016] The present invention is further configured such that: the reset spring includes a first end and a second end, the first end is abutting against the push block, and the second end is used to be inserted into the limiting groove.

[0017] The present invention is further configured such that: a reinforcing plate is provided at the position of the limit plate corresponding to the operating surface of the handle, and a limit groove is formed between the reinforcing plate and the limit plate.

[0018] The present invention is further configured such that: a cylindrical gear is provided on the columnar part, and the cylindrical gear is linked with the gear set.

[0019] In summary, this utility model has the following beneficial effects: by designing the limiting plate, the installation position of the reset spring is changed, and the reset card can be easily embedded into the limiting groove while maintaining the function of the reset spring. Furthermore, when the cover plate is installed on the base, the sealing plate plays a limiting and fixing role for the reset spring, preventing the reset spring from shifting. Attached Figure Description

[0020] Figure 1 A three-dimensional structural diagram of a circuit breaker;

[0021] Figure 2 This is a schematic diagram of the base structure;

[0022] Figure 3 This is a schematic diagram of the cover plate structure;

[0023] Figure 4 This is a schematic diagram of the three-dimensional structure of the base;

[0024] Figure 5 for Figure 4 Enlarged view of point A;

[0025] Figure 6 This is a three-dimensional structural diagram of the operating mechanism.

[0026] Reference numerals: 1. Base; 11. Handle operating surface; 12. Limiting plate; 13. Limiting groove; 14. Reinforcing plate; 2. Cover plate; 21. Sealing plate; 22. Abutting block; 3. Mounting cavity; 4. Operating mechanism; 5. Operating handle; 51. Mounting groove; 52. Handle body; 53. Pushing block; 54. Columnar part; 55. Cylindrical gear; 6. Return spring; 61. First end; 62. Second end; 7. Gear set; 8. Electromagnetic tripping assembly; 9. Motor tripping assembly. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0028] Reference Figures 1 to 6 As shown, in order to achieve the above objectives, the present invention provides the following technical solution: a handle structure for a miniature circuit breaker, including a base 1 and a cover plate 2, the base 1 and the cover plate 2 together form an installation cavity 3, an operating mechanism 4 is provided in the installation cavity 3, the operating mechanism 4 includes an operating handle 5 and a return spring 6, one side of the operating handle 5 is provided with an installation groove 51 for the return spring 6 to be installed, and the operating handle 5 is rotatably connected to the base 1;

[0029] A sealing plate 21 is provided on the cover plate 2. When the cover plate 2 is installed on the base 1, a gap is left between the sealing plate 21 and the operating handle 5 for the end of the reset spring 6 to extend out.

[0030] The base 1 includes a handle operating surface 11, and one end of the operating handle 5 extends from the handle operating surface 11;

[0031] A limiting plate 12 is provided inside the base 1, and a limiting groove 13 is provided between the limiting plate 12 and the operating surface of the handle for the reset spring 6 to extend into.

[0032] The design of this utility model, through the design of the limiting plate 12, changes the installation position of the reset spring 6, which can maintain the function of the reset spring 6 and conveniently embed the reset card into the limiting groove 13. Furthermore, when the cover plate 2 is installed on the base 1, the sealing plate 21 plays a role in limiting and fixing the reset spring 6, preventing the reset spring 6 from shifting.

[0033] The present invention is further configured such that: the operating handle 5 includes a handle body 52, a push block 53, and a columnar part 54, the handle body 52 is connected to the upper end of the columnar part 54, the mounting groove 51 is disposed in the middle of the columnar part 54, and the push block 53 is disposed on the columnar part 54.

[0034] The present invention is further configured such that: the push block 53, the columnar part 54 and the sealing plate 21 surround and form a gap, the gap being located on the side of the columnar part 54 near the handle body 52;

[0035] A gear set 7 is provided on the side of the columnar part 54 away from the handle body 52.

[0036] The present invention is further configured such that: an electromagnetic tripping assembly 8 and a motor tripping assembly 9 are provided on the side of the gear set 7 away from the columnar part 54.

[0037] like Figure 2 and Figure 4 as well as Figure 6 As shown, the circuit breaker in this application adds electromagnetic tripping function and remote control tripping function. The two corresponding mechanisms will occupy most of the internal space of the circuit breaker. While keeping the size of the housing unchanged, the structure of the operating mechanism 4 needs to be optimized.

[0038] Therefore, this application designs the end of the return spring 6 at the upper end of the columnar portion 54, rather than the lower end of the columnar portion 54, because the lower end of the columnar portion 54 is affected by the gear set 7 and does not have effective installation space.

[0039] The casing is subject to market standards, and its size is relatively fixed and cannot be changed.

[0040] Electromagnetic tripping principle: When leakage occurs inside the circuit breaker, the moving iron core is connected to the electromagnetic tripping part through the reset spring 6. When the live wire leaks current, part of the current forms a loop through the ground, causing the vector sum of the currents in the live wire and the neutral wire to be non-zero (i.e., residual current). At this time, a zero-sequence magnetic flux is generated in the transformer core. When the leakage current coil frame is energized, the moving iron core moves, overcoming the resistance of the reset spring 6 and pushing the tripping part to achieve the tripping operation.

[0041] Motor tripping principle: When a remote signal is sent to the built-in motor, the motor rotates. Through the action of the worm gear, worm wheel, and gear set 7, the tripping block on the tripping gear pushes the tripping component to achieve the tripping operation. The specific structure can be referenced. Figure 6 As shown, since this specific detail is not the main content of protection in this application, it will not be elaborated upon.

[0042] The present invention is further configured such that: an abutment block 22 is provided on the cover plate 2, and when the cover plate 2 is installed on the base 1, the abutment block 22 abuts against the lower end of the limiting plate 12. The design of the abutment block 22 enables it to abut against the lower end of the limiting plate 12, thereby improving the stability of the device.

[0043] The present invention is further configured such that: the reset spring 6 includes a first end 61 and a second end 62, the first end 61 is abutting against the push block 53, and the second end 62 is used to be inserted into the limiting groove 13.

[0044] The present invention is further configured such that: a reinforcing plate 14 is provided on the handle operating surface 11 at the position corresponding to the limiting plate 12, and a limiting groove 13 is formed between the reinforcing plate 14 and the limiting plate 12. This structural design can increase the thickness of the limiting groove 13 area.

[0045] This utility model is further configured such that a cylindrical gear 55 is provided on the columnar portion 54, and the cylindrical gear 55 is linked with the gear set 7. With this structure, when the remote-controlled motor is started, the gear set 7 will drive the operating handle 5 to rotate, thereby allowing the circuit breaker's status to be known by observing its external condition. This structure is prior art and will not be described in detail.

[0046] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A handle structure for a miniature circuit breaker, comprising a base (1) and a cover plate (2), wherein the base (1) and the cover plate (2) together form a mounting cavity (3), and an operating mechanism (4) is provided within the mounting cavity (3), characterized in that: The operating mechanism (4) includes an operating handle (5) and a reset spring (6). The operating handle (5) has a mounting groove (51) for the reset spring (6) to be installed on one side. The operating handle (5) is rotatably connected to the base (1). A sealing plate (21) is provided on the cover plate (2). When the cover plate (2) is installed on the base (1), a gap is left between the sealing plate (21) and the operating handle (5) for the end of the reset spring (6) to extend out. The base (1) includes a handle operating surface (11), and one end of the operating handle (5) extends from the handle operating surface (11); A limiting plate (12) is provided inside the base (1), and a limiting groove (13) is provided between the limiting plate (12) and the handle operating surface (11) for the reset spring (6) to extend into.

2. The handle structure of a miniature circuit breaker according to claim 1, characterized in that: The operating handle (5) includes a handle body (52), a push block (53), and a columnar part (54). The handle body (52) is connected to the upper end of the columnar part (54), the mounting groove (51) is disposed in the middle of the columnar part (54), and the push block (53) is disposed on the columnar part (54).

3. The handle structure of a miniature circuit breaker according to claim 2, characterized in that: The push block (53), the columnar part (54) and the sealing plate (21) together form a gap, which is located on the side of the columnar part (54) near the handle body (52); A gear set (7) is provided on the side of the columnar part (54) away from the handle body (52).

4. The handle structure of a miniature circuit breaker according to claim 3, characterized in that: An electromagnetic trip assembly (8) and a motor trip assembly (9) are provided on the side of the gear set (7) away from the columnar part (54).

5. The handle structure of a miniature circuit breaker according to claim 1, characterized in that: The cover plate (2) is provided with an abutment block (22). When the cover plate (2) is installed on the base (1), the abutment block (22) abuts against the lower end of the limiting plate (12).

6. The handle structure of a miniature circuit breaker according to claim 2, characterized in that: The reset spring (6) includes a first end (61) and a second end (62). The first end (61) is abutted against the push block (53), and the second end (62) is used to be inserted into the limiting groove (13).

7. The handle structure of a miniature circuit breaker according to claim 1, characterized in that: The handle operating surface (11) is provided with a reinforcing plate (14) at the position corresponding to the limiting plate (12), and a limiting groove (13) is formed between the reinforcing plate (14) and the limiting plate (12).

8. The handle structure of a miniature circuit breaker according to claim 3, characterized in that: A cylindrical gear (55) is provided on the columnar part (54), and the cylindrical gear (55) is linked with the gear set (7).

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