A housing for a circuit breaker accessory

Abstract

The utility model discloses a kind of housings of circuit breaker accessories, it is related to circuit breaker accessory technical field, solve the problem that its buckle position faces root easy to break, unreliable connection. The position of the root of buckle is provided with the T-shaped through-hole of the thickness direction of shell main body, and T-shaped through-hole includes the upper horizontal part and lower vertical part connected;Upper horizontal part is closely arranged with the edge of buckle root, and the width direction of upper horizontal part is parallel with the width direction of buckle root, and the width size of upper horizontal part is consistent with the width size of buckle root;Lower vertical part extends to the inside direction of shell main body in the direction of buckle back. The upper horizontal part of T-shaped through-hole is closely arranged with the edge of buckle root and width matching, so that through-hole covers stress concentration zone, effectively disperses the stress concentration of buckle root, by removing root adjacent material directly reduces the rigidity of this area, reduce fatigue damage, reduce the risk of root breakage;Avoid local stress accumulation, further improve the fatigue resistance of buckle.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker accessory technology, and in particular to a housing for a circuit breaker accessory. Background Technology

[0002] In power systems and electrical equipment, circuit breakers are important protective devices. Their stable operation depends on the coordinated work of various supporting accessories. Circuit breaker accessories include protectors, trip units, auxiliary accessories, alarm accessories, etc. These accessories, in conjunction with circuit breakers, realize functions such as monitoring, protection and status feedback of circuits.

[0003] To ensure the stability and ease of connection between circuit breaker accessories and circuit breakers, a snap-fit ​​structure is typically installed on the accessory's housing. This snap-fit ​​engages with corresponding slots on the circuit breaker, enabling quick assembly and fixation. However, in practical use, the snap-fit ​​joints on the circuit breaker accessory housing often suffer from insufficient toughness due to improper structural design. The base of the latch in existing housings is typically a solid structure. During repeated insertion and removal or assembly stress, stress concentration easily occurs at the connection between the latch base and the housing body. Since the housing is mostly made of engineering plastics, its toughness is limited. This makes the base of the latch prone to fatigue damage due to stress concentration during repeated engagement and disengagement operations, easily leading to micro-cracks or even fracture at the base, causing connection failure between the accessory and the circuit breaker. To ensure structural strength, the latch area of ​​traditional housings is often designed with a uniform thickness (typically about 2.5mm). Excessive thickness results in high bending stiffness in this area, making it difficult to release energy through elastic deformation under stress, thus accelerating brittle fracture. Utility Model Content

[0004] The purpose of this utility model is to overcome the defects of the prior art by providing a housing for a circuit breaker accessory that solves the problems of easy breakage at the root and unreliable connection at its snap-fit ​​position.

[0005] The technical solution of this utility model includes a housing body and a buckle disposed on the housing body. The buckle is used to engage with a slot on the circuit breaker housing. A T-shaped through hole penetrating the thickness direction of the housing body is provided on one side of the root of the buckle. The T-shaped through hole includes an upper horizontal part and a lower vertical part connected together. The upper horizontal part is disposed close to the edge of the root of the buckle, and the width direction of the upper horizontal part is parallel to the width direction of the root of the buckle. The width dimension of the upper horizontal part is the same as the width dimension of the root of the buckle. The lower vertical part extends inward toward the inside of the housing body away from the buckle.

[0006] Using the above technical solution, the upper horizontal part of the T-shaped through hole is closely attached to the edge of the buckle root and the width matches, so that the through hole covers the stress concentration area and effectively disperses the stress concentration at the buckle root. By removing the adjacent material at the root, the rigidity of this area is directly reduced, thus providing the buckle with a certain elastic deformation space. This allows the buckle to release stress through moderate deformation during the buckling and disengagement process, reducing fatigue damage and lowering the risk of root fracture. The lower vertical part extends inward to form a stress diffusion channel. When the buckle is bent under force, the root material undergoes elastic deformation along the T-shaped hole instead of brittle fracture. At the same time, the through hole structure that runs through the thickness direction ensures that the stress release path runs through the shell thickness, avoiding local stress accumulation and further improving the buckle's fatigue resistance.

[0007] In one possible design, the area where the T-shaped through-hole is located is a locally thinned area of ​​the outer shell body, and the thickness of this locally thinned area is less than the thickness of other areas of the outer shell body.

[0008] With the above design, the local thinning area overlaps with the T-shaped through hole space. In fact, through the dual effects of reducing the moment of inertia of the cross section and optimizing the stress flow generated by the thickness reduction and the through hole guidance, the flexibility of this area is multiplied, the bending stiffness of this area is reduced, and the buckle is more likely to undergo elastic deformation when under stress, thereby better releasing energy and avoiding brittle fracture caused by high stiffness.

[0009] In one possible design, the thickness of the locally thinned area is 1.2 mm to 1.8 mm.

[0010] Using the above design, experimental verification shows that this thickness range avoids both insufficient structural strength due to excessive thinness and the impact of excessive thickness on elastic deformation, ensuring that the buckle can work reliably during repeated stress and effectively reducing the risk of breakage.

[0011] In one possible design, the localized thinning zone covers an area at least 2 mm wide around the T-shaped through-hole.

[0012] With the above design, the thinning zone covers an area of ​​≥2mm around the through hole, ensuring that the surrounding material participates in the elastic response synchronously when the T-hole deforms, and preventing stress from concentrating again at the thinning boundary.

[0013] In one possible design, the lower vertical part of the T-shaped through hole is connected to the upper horizontal part, and the axis of the lower vertical part is perpendicular to the axis of the upper horizontal part, and the width of the lower vertical part is smaller than the width of the upper horizontal part.

[0014] With the above design, the width of the lower vertical section is smaller than that of the upper horizontal section and they are orthogonally connected, which forces the stress to be dispersed to both sides along the upper horizontal section, avoids the stress from converging at the end of the lower vertical section, and optimizes the stress transmission path.

[0015] In one possible design, the buckle is a flexible cantilever beam structure with a root width of 3mm to 8mm.

[0016] The above design limits the buckle to an elastic cantilever beam structure. This solution is universally applicable. The cantilever beam structure within the aforementioned width range can produce moderate elastic deformation under stress. Combined with the through-hole and thinning design, stress concentration is further reduced, enhancing the buckle's fatigue resistance and service life, and ensuring the long-term stability of the connection. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external structure of this utility model; Figure 2 This utility model Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a partial structural diagram of the interior of the outer shell of this utility model; Among them, 1. Outer shell body; 2. Buckle; 3. T-shaped through hole; 31. Upper horizontal part; 32. Lower vertical part; 4. Local thinning area. Detailed Implementation

[0018] like Figures 1 to 3 The diagram shows the housing of a circuit breaker accessory, comprising a housing body 1 and a latch 2 disposed on the housing body 1. The latch 2 is used to engage with a slot on the circuit breaker housing. The latch 2 is an elastic cantilever beam structure with a root width of 5mm. This size design allows the latch 2 to produce moderate elastic deformation under stress, which is beneficial for reducing stress concentration when used with other structures. A T-shaped through-hole 3, penetrating the thickness direction of the outer shell body 1, is provided on one side of the base of the buckle 2. The T-shaped through-hole 3 includes an upper horizontal portion 31 and a lower vertical portion 32 connected together. The upper horizontal portion 31 is set close to the edge of the base of the buckle 2, and its width direction is parallel to the width direction of the base of the buckle 2. The width dimension of the upper horizontal portion 31 is the same as that of the base of the buckle 2, both being 5mm. The lower vertical portion 32 extends inward toward the inner side of the outer shell body 1, away from the buckle 2. The lower vertical portion 32 is connected to the upper horizontal portion 31, and its axis is perpendicular to the axis of the upper horizontal portion 31. The width of the lower vertical portion 32 is 3mm, which is smaller than the width of the upper horizontal portion 31. This structural design of the T-shaped through-hole 3, with the upper horizontal portion 31 matching the width of the base of the buckle 2 and set close to it, can effectively disperse the stress at the base of the buckle 2. The size and orientation design of the lower vertical portion 32 optimizes the stress dispersion path and avoids excessive weakening of the key stress-bearing area at the base of the buckle 2. The area of ​​the outer shell body 1 containing the T-shaped through-hole 3 is a locally thinned region 4. The thickness of this locally thinned region 4 is less than the thickness of other areas of the outer shell body 1, and the thickness of the locally thinned region 4 is 1.5 mm. The range of the locally thinned region 4 covers an area 2 mm wide around the T-shaped through-hole 3. Experiments show that this range can reduce the bending stiffness by more than 30%, while avoiding strength collapse caused by excessive thinning. This design expands the effective range of elastic deformation, makes stress distribution more uniform, and ensures the basic structural strength of the shell, achieving a balance between toughness and strength. In addition, the sufficient thinning range allows a larger area of ​​flexible deformation band to be formed when the root of the buckle is under stress, absorbing more mechanical energy. Moreover, only the area around the through-hole is thinned, while other parts of the shell maintain their original thickness, balancing the improvement of toughness and the overall structural integrity.

[0019] In practical use, when the clip 2 engages or disengages from the slot on the circuit breaker housing, the T-shaped through hole 3 provides a certain elastic deformation space for the clip 2. Furthermore, the locally thinned area 4 reduces the bending stiffness of this region, allowing the clip 2 to release stress through moderate deformation, thus reducing fatigue damage. Moreover, the dimensions and fit of each structural component further enhance the toughness of the clip 2, reducing the risk of root fracture and ensuring the reliability and long-term stability of the connection between the housing and the circuit breaker.

Claims

1. A housing for a circuit breaker accessory, comprising a housing body (1) and a snap fastener (2) disposed on the housing body (1), the snap fastener (2) being used to engage with a slot on a circuit breaker housing; characterized in that: A T-shaped through hole (3) penetrating the thickness direction of the outer shell body (1) is provided on one side of the root of the buckle (2). The T-shaped through hole (3) includes an upper horizontal part (31) and a lower vertical part (32) connected together. The upper horizontal part (31) is set close to the edge of the root of the buckle (2), and the width direction of the upper horizontal part (31) is parallel to the width direction of the root of the buckle (2). The width dimension of the upper horizontal part (31) is the same as the width dimension of the root of the buckle (2). The lower vertical part (32) extends inward from the buckle (2) toward the inner side of the outer shell body (1).

2. The housing of the circuit breaker accessory according to claim 1, characterized in that: The area where the T-shaped through hole (3) is located is a local thinning area (4), and the thickness of the local thinning area (4) is less than the thickness of other areas of the outer shell body (1).

3. The housing of the circuit breaker accessory according to claim 2, characterized in that: The thickness of the local thinning zone (4) is 1.2 mm to 1.8 mm.

4. The housing of the circuit breaker accessory according to claim 2, characterized in that: The extent of the local thinning zone (4) covers an area at least 2 mm wide around the T-shaped through hole (3).

5. The housing of the circuit breaker accessory according to claim 1 or 2, characterized in that: The lower vertical part (32) of the T-shaped through hole (3) is connected to the upper horizontal part (31), and the axis of the lower vertical part (32) is perpendicular to the axis of the upper horizontal part (31). The width of the lower vertical part (32) is smaller than the width of the upper horizontal part (31).

6. The housing of the circuit breaker accessory according to claim 1 or 2, characterized in that: The buckle (2) is an elastic cantilever beam structure with a root width of 3mm to 8mm.

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