A casing for circuit breaker accessories
By adopting a snap structure in the circuit breaker accessory housing and improving the wall thickness and glass fiber content of the material, the problems of large gaps and shell bulge after wiring are solved, which significantly improves structural stability and impact resistance.
Patent Information
- Application Number
- CN202421711484.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-07-18
AI Technical Summary
The shell of the circuit breaker attachment is prone to problems such as large gaps and bulging shells after wiring, mainly due to insufficient assembly accuracy and stability, inappropriate wall thickness and structural strength, and poor raw material characteristics and environmental adaptability.
A circuit breaker attachment housing including an upper cover and a lower cover is designed, and a snap-on structure is used to enhance the mechanical strength, and the PA66 nylon material that moderately increases the wall thickness and increases the glass fiber content, thereby enhancing the mechanical strength of the material and the hardness after water absorption.
Through the design of the snap structure, the tight connection between the upper cover and the lower cover is ensured, which reduces gaps and shaking, and improves the overall structural stability of the shell. At the same time, the enhanced wall thickness and material properties reduce surface whitening and bulging, and improve the wear and impact resistance of the shell.
Smart Images
Figure CN222705408U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuit breaker accessories, in particular to a housing of a circuit breaker accessory. Background Art
[0002] Circuit breaker accessories include auxiliary accessories, alarm accessories, undervoltage accessories, shunt accessories, etc. Although the shell design of circuit breaker accessories usually follows industry standards and does not require additional customization, we encountered some problems in actual operation. Specifically, the upper and lower covers of the shell had significant cracks when tightening the torque wiring, and white marks appeared on the surface of the shell (mainly at the corresponding positions on both sides of the screw tile). In order to deeply understand this phenomenon, we conducted the following cause analysis:
[0003] 1. Assembly accuracy and stability issues: During the assembly process, if the seal between the upper and lower covers of the housing is not tight enough and there is an obvious gap, this will directly affect the overall stability and durability of the product. Especially during the wiring test phase, if the shaking space of the wiring board is too large, it may aggravate the stress concentration of the housing and cause structural damage.
[0004] 2. Relationship between wall thickness and structural strength: The wall thickness of the product shell is designed to be 0.80mm±0.10mm, which is relatively thin. When wiring the terminals, especially when tightening the screws with a tightening torque of 2N.m, the shell must withstand the impact force brought by the screws. For shells with thinner walls, this impact may cause local areas to be unable to withstand pressure, resulting in bulging, whitening of the surface, and enlarged gaps.
[0005] 3. Raw material characteristics and environmental adaptability: The outer shell of the circuit breaker accessories is made of PA66 nylon material, which contains 30% glass fiber. This material will show the characteristics of increased toughness but decreased hardness after absorbing water. This means that in a humid environment, the outer shell may become more flexible, but at the same time it is more susceptible to external forces, thus affecting its structural integrity. Summary of the invention
[0006] Purpose of the utility model: In order to overcome the defects of the prior art, the utility model provides a shell of a circuit breaker accessory to solve the problems of large shell gap and bulging shell after wiring.
[0007] The technical solution of the utility model comprises an upper cover and a lower cover, a terminal installation area is arranged between the upper cover and the lower cover, and buckle structures are arranged on the upper cover and the lower cover, and each buckle structure is arranged at a corresponding peripheral position of the terminal installation area.
[0008] By adopting the above technical solution, the snap-fit structure not only enhances the mechanical strength of the housing, but also ensures a tight connection between the upper cover and the lower cover, thereby reducing gaps and shaking caused by improper assembly or external force.
[0009] In a possible design, the buckle structure includes a buckle piece and a buckle hole. One of the upper cover and the lower cover is integrally provided with the buckle piece, and the other forms the buckle hole. The buckle piece includes an elastic part and a wedge-shaped buckle head at the end of the elastic part. The elastic part passes through the buckle hole, and the wedge-shaped buckle head rests against the edge of the buckle hole.
[0010] By adopting the above design, a firm connection between the upper cover and the lower cover is achieved by accurately inserting the buckle piece into the buckle hole, which can significantly improve the overall structural stability of the shell and reduce shell deformation and gap expansion caused by external forces or vibrations. At the same time, the quick docking of the buckle piece and the buckle hole makes the assembly process more efficient and quick, simplifying the assembly process of circuit breaker accessories.
[0011] In one possible design, the terminal mounting areas of the upper cover and the lower cover form a right-angle step, the side of the right-angle step is provided with a socket for inserting an external wire, the top surface of the right-angle step is provided with a mounting hole for inserting a tool, and the snap-fit structure is located above the socket near the right-angle corner.
[0012] With the above design, the buckle structure is arranged at a position where the gap is likely to expand, and the layout is more reasonable and effective, ensuring the structural stability of the buckle structure when subjected to external force.
[0013] In a possible design, the wall thickness of the right-angle step is between 0.95 mm and 1.05 mm.
[0014] With the above design, a moderate increase in wall thickness provides stronger structural support for the right-angle step, which can maintain its shape without deformation even under high-intensity tightening torque, thus avoiding the occurrence of bulging. At the same time, it improves the impact resistance of the screw tile on the outer shell during wiring, disperses the local pressure of the screw gasket on the wiring point, and reduces surface whitening and other forms of surface damage.
[0015] In one possible design, the upper cover and the lower cover are made of PA66 nylon material, which has a glass fiber content of 37%-42%.
[0016] With the above design, the high content of glass fiber significantly improves the mechanical strength and rigidity of the PA66 nylon material, especially improves the hardness of the shell after absorbing water, making it more wear-resistant and impact-resistant, and further reducing the occurrence of surface whitening and bulging. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the appearance structure of a specific embodiment of the utility model;
[0018] Figure 2 The structure diagram of the utility model with the upper cover opened Figure 1 ;
[0019] Figure 3 The structure diagram of the utility model with the upper cover opened Figure 2 ;
[0020] Among them, 1. upper cover; 2. lower cover; 3. terminal installation area; 4. wiring terminal; 5. snap-on structure; 51. snap piece; 511. elastic part; 512. wedge-shaped snap-on head; 52. snap hole; 6. right-angle step; 61. jack; 62. installation hole. DETAILED DESCRIPTION
[0021] like Figure 1-Figure 3 The housing of a circuit breaker accessory shown in the figure includes an upper cover 1 and a lower cover 2, and a plurality of terminal installation areas 3 are arranged between the upper cover 1 and the lower cover 2, and the terminal installation areas 3 are used to install connection terminals 4 such as screws, screw tiles, etc. The upper cover 1 and the lower cover 2 are provided with snap structures 5, and each snap structure 5 is correspondingly arranged at the outer position of the terminal installation area 3. The snap structure 5 includes a snap piece 51 and a snap hole 52, and the snap piece 51 is inserted into the snap hole 52 to form a snap fit. Specifically, the upper cover 1 is integrally provided with the snap piece 51, and the snap piece 51 includes an elastic part 511 and a wedge-shaped snap head 512 at the end of the elastic part 511, and the elastic part 511 passes through the snap hole 52, and the wedge-shaped snap head 512 is pressed against the edge of the snap hole 52, thereby forming a snap fit. The elastic part 511 has a certain elasticity due to the material. The wedge-shaped buckle head 512 utilizes the inclined surface principle. When the buckle piece 51 is inserted into the buckle hole 52 , the inclined surface forces the elastic part 511 to bend to one side. After the elastic part 511 completely passes through the buckle hole 52 , the wedge-shaped buckle head 512 presses against the edge of the buckle hole 52 .
[0022] A right-angle step 6 is formed at the terminal installation area 3 of the upper cover 1 and the lower cover 2. A plug hole 61 is provided on the side of the right-angle step 6. A mounting hole 62 is provided on the top surface of the right-angle step 6. The buckle structure 5 is located above the plug hole 61 and near the right-angle corner. When connecting an external wire, the external wire is inserted into the plug hole 61 and connected to the terminal 4 of the terminal installation area 3. Then a tool is inserted into the mounting hole 62 to tighten the terminal 4 to fix the external wire. Depending on the usage, the right-angle corner of the right-angle step 6 is prone to the problem of gap expansion. The buckle structure 5 is set at this position to more effectively ensure the reliability of the structure.
[0023] The wall thickness of the right-angle step 6 is between 0.95 mm and 1.05 mm, which is equivalent to an increase of 0.15 mm to 0.25 mm in wall thickness. The moderate increase in wall thickness not only enhances the mechanical strength of the right-angle step 6, but also effectively buffers the impact force generated when the screw gasket is connected to the wire.
[0024] The upper cover 1 and the lower cover 2 are made of PA66 nylon material, and the glass fiber content is increased from 30% to 40%, thereby increasing the hardness of the product after absorbing water and further reducing the occurrence of whitening and bulging on the surface.
Claims
1. A housing of a circuit breaker accessory, comprising an upper cover (1) and a lower cover (2), wherein a terminal installation area (3) is provided between the upper cover (1) and the lower cover (2), characterized in that: The upper cover (1) and the lower cover (2) are provided with buckle structures (5), and each buckle structure (5) is correspondingly arranged at a peripheral position of the terminal installation area (3).
2. The housing of the circuit breaker accessory according to claim 1, characterized in that: The buckle structure (5) comprises a buckle piece (51) and a buckle hole (52); one of the upper cover (1) and the lower cover (2) is integrally provided with the buckle piece (51), and the other forms the buckle hole (52); the buckle piece (51) comprises an elastic portion (511) and a wedge-shaped buckle head (512) at the end of the elastic portion (511); the elastic portion (511) passes through the buckle hole (52), and the wedge-shaped buckle head (512) abuts against the edge of the buckle hole (52).
3. The housing of the circuit breaker accessory according to claim 2, characterized in that: The terminal installation areas (3) of the upper cover (1) and the lower cover (2) form a right-angle step (6), a side surface of the right-angle step (6) is provided with a plug hole (61) for inserting an external wire, a top surface of the right-angle step (6) is provided with a mounting hole (62) for inserting a tool, and the buckle structure (5) is located above the plug hole (61) and near the right-angle corner.
4. The housing of the circuit breaker accessory according to claim 3, characterized in that: The wall thickness of the right-angle step (6) is between 0.95 mm and 1.05 mm.
5. The housing of the circuit breaker accessory according to claim 1 or 3, characterized in that: The upper cover (1) and the lower cover (2) are made of PA66 nylon material.