Resettable fuse with protective shell

Abstract

The utility model relates to the technical field of resettable fuses, and discloses a resettable fuse with a protective shell, which comprises a first base, a fuse body is fixedly connected in the first base, a shell is slidably connected to the top of the first base, a clamping groove is formed in the shell, and a locking assembly is arranged on the outer wall of the first base. And the locking assembly comprises a second base, the bottom of the second base is fixedly connected to the outer wall of the first base, the interior of the second base is slidably connected with a limiting column, and the outer wall of the limiting column is fixedly connected with a supporting column. According to the utility model, the dismounting column is pulled to drive the supporting column to slide in the base II through the limiting column, so that the clamping block is separated from the clamping groove, and then the shell can be separated from the base I, thereby achieving the effect of facilitating the dismounting and mounting of the shell, and solving the problem that a conventional protection shell is buckled through a buckle, and the internal fuse is not damaged when being dismounted and maintained. Therefore, the convenience of the resettable fuse is improved.

Description

Technical Field

[0001] This utility model relates to the field of self-resetting fuse technology, and in particular to a self-resetting fuse with a protective shell. Background Technology

[0002] A resettable fuse, also known as a polymer resettable fuse or a PTC (positive temperature coefficient) fuse, is a component used in circuits to protect electrical equipment from overload or short circuit damage. Unlike traditional fuses, resettable fuses automatically disconnect the circuit when the current exceeds a safe limit and automatically return to normal operation after the problem is resolved, requiring no replacement. To effectively prevent direct physical damage from the external environment, resettable fuses with protective housings are necessary.

[0003] Resettable fuses with protective housings come in various types, including plastic-cased, metal-cased, and ceramic-cased resettable fuses. Depending on the housing material and application, they can be categorized into plastic-cased, metal-cased, ceramic-cased, waterproof, high-temperature, and miniaturized surface-mount types. Metal-cased resettable fuses, in particular, utilize a metal housing, typically made of steel, aluminum, or nickel alloy. The metal housing provides higher heat resistance and mechanical strength, better protecting internal components from external impacts, vibrations, and chemical corrosion.

[0004] In existing technologies, traditional resettable fuses with protective housings often have a problem: when the fuse needs to be removed and maintained, the removal process is cumbersome due to the housing's snap-fit ​​structure or other fixing methods, requiring operators to use tools, increasing maintenance time and complexity. This not only reduces maintenance efficiency but also leads to damage to the fuse and other components during removal. Therefore, simplifying the disassembly and installation process while ensuring the protective function of the housing has become a major design challenge. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a self-resetting fuse with a protective shell, which aims to improve the problem of the traditional protective shell being cumbersome to disassemble for maintenance of the internal fuse by means of a snap-fit.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a self-resetting fuse with a protective shell, comprising a base, a fuse body fixedly connected inside the base, a shell slidably connected to the top of the base, a slot provided inside the shell, and a locking component provided on the outer wall of the base.

[0007] The locking assembly includes a second base, the bottom of which is fixedly connected to the outer wall of a first base. A limiting post is slidably connected inside the second base, and a support post is fixedly connected to the outer wall of the limiting post. A locking block is fixedly connected to one side of the support post, and the locking block engages with a slot. A reset assembly is provided between the support post and the second base.

[0008] As a further description of the above technical solution:

[0009] The reset assembly includes a first spring, which is disposed between the support column and the base two. One end of the first spring is fixedly connected to the other side of the support column, and the other end of the first spring is fixedly connected to the inside of the base two. A disassembly column is fixedly connected to the other side of the support column, and the disassembly column is slidably connected to the inside of the base two.

[0010] As a further description of the above technical solution:

[0011] The housing has a locking groove inside, and a support frame is fixedly connected inside the housing.

[0012] As a further description of the above technical solution:

[0013] A frame is slidably connected inside the housing, and a locking block is fixedly connected to the outer wall of the frame.

[0014] As a further description of the above technical solution:

[0015] The locking blocks are symmetrically arranged on one side and fixedly connected to the outer wall of the frame, and the locking blocks are slidably connected inside the locking groove.

[0016] As a further description of the above technical solution:

[0017] A breathable and waterproof membrane is slidably connected inside the frame, and a second spring is provided inside the frame.

[0018] As a further description of the above technical solution:

[0019] One end of the second spring is fixedly connected inside the frame, and the other end of the second spring is fixedly connected to the top of the support frame.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, firstly, pulling the disassembly column causes the support column to slide within the base two through the limiting column, so that the locking block separates from the locking groove. Then, the housing can be separated from the base one, achieving the effect of facilitating the disassembly and installation of the housing. This solves the problem that traditional protective housings are relatively cumbersome when disassembling and maintaining the internal fuses by using buckles, and improves the convenience of self-resetting fuses.

[0022] 2. In this utility model, the breathable and waterproof membrane is limited by the frame, and the frame is locked to the shell by the locking block sliding into the locking groove. At the same time, the frame is supported by the tension of the second spring, which achieves the effect of breathability and waterproofness. This solves the problem that the inside of the shell is not breathable, which prevents the internal moisture from spreading quickly, and improves the practicality of the self-resetting fuse with a protective shell. Attached Figure Description

[0023] Figure 1 A perspective view of a self-resetting fuse with a protective casing proposed in this utility model;

[0024] Figure 2 This is a schematic diagram of the housing structure of a self-resetting fuse with a protective outer shell proposed in this utility model;

[0025] Figure 3 This is a schematic diagram of a support frame structure for a self-resetting fuse with a protective shell proposed in this utility model.

[0026] Figure 4 This is a schematic diagram of the frame structure of a self-resetting fuse with a protective shell proposed in this utility model;

[0027] Figure 5 for Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0028] Legend:

[0029] 1. Base 1; 2. Housing; 3. Base 2; 4. Slot; 5. Fuse body; 6. Limiting post; 7. Support post; 8. Locking block; 9. First spring; 10. Removal post; 11. Support frame; 12. Locking slot; 13. Frame; 14. Locking block; 15. Breathable and waterproof membrane; 16. Second spring. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Reference Figure 1 , Figure 2 and Figure 5This utility model provides an embodiment of a self-resetting fuse with a protective shell, comprising a base 1, inside which a fuse body 5 is fixedly connected. The fuse body 5 is used to implement circuit overload protection. When the current exceeds a set value, the fuse automatically disconnects the circuit and automatically resets after the fault is cleared. A housing 2 is slidably connected to the top of the base 1. The housing 2 protects the fuse body 5 from damage by the external environment and provides support and stability for the fuse body 5. A slot 4 is provided inside the housing 2, which cooperates with a locking block 8 to lock and fix the position of the housing 2, preventing displacement of the housing 2 during use and ensuring overall stability. A locking component is provided on the outer wall of the base 1 to ensure the stability of the housing 2.

[0032] The locking assembly includes a base 2 (3), whose bottom is fixedly connected to the outer wall of base 1 (1), serving to support and strengthen the connection between base 1 (1) and housing 2, thereby enhancing structural stability. A limit post 6 is slidably connected inside base 2 (3), and a support post 7 is fixedly connected to the outer wall of the limit post 6. The support post 7 provides a support structure to prevent excessive displacement of housing 2 during operation, ensuring safety. A locking block 8 is fixedly connected to one side of the support post 7, engaging with a slot 4 inside housing 2 to lock and secure housing 2, preventing loosening. A reset assembly is provided between the support post 7 and base 2 (3) to automatically restore the structure to its original position after disassembly or loosening. The reset assembly includes a first spring 9, which is positioned between the support post 7 and base 2 (3) to restore the position of the support post 7. One end of the first spring 9 is fixedly connected to the other side of the support post 7, and the other end is fixedly connected inside base 2 (3), ensuring the spring tension remains effective and providing sufficient rebound force. A disassembly post 10 is fixedly connected to the other side of the support post 7, slidably connected inside base 2 (3). The disassembly column 10 can easily control the disassembly process of the housing 2. When it is necessary to repair or replace the fuse, the operator can pull the disassembly column 10 to drive the support column 7 to slide within the base 2 3 through the limit column 6, thereby realizing the disassembly and replacement of the housing 2.

[0033] Specifically, when installing housing 2, first, housing 2 is firmly placed on top of base 1, ensuring its correct position. Then, housing 2 is precisely engaged and embedded in the slot 4 on the inner wall of base 1 via the locking block 8 on the outer wall of base 1, thus achieving a secure lock. This structural design ensures the stability and safety of housing 2 after installation, preventing loosening due to vibration or external force. If housing 2 needs to be disassembled, simply pull the disassembly column 10. While pulling the disassembly column 10, the support column 7 is guided by the limiting column 6 and slides smoothly inside base 3, effectively releasing the connection between the locking block 8 and the slot 4, completing the separation from base 1. The disassembly process is smooth and efficient, avoiding cumbersome disassembly steps and facilitating quick maintenance and replacement. After releasing the disassembly column 10, the locking block 8 will quickly reset under the tension of the first spring 9, automatically returning to its original position, ensuring stability and safety during disassembly and installation. This design greatly improves the ease of installation and disassembly of the housing 2, solves the problem of requiring multiple tools and taking a long time in traditional installation methods, and greatly improves work efficiency.

[0034] Reference Figure 3 and Figure 4The housing 2 has a locking groove 12 inside, which engages with a locking block 14 to ensure the frame 13 is stably positioned inside the housing 2. A support frame 11 is fixedly connected inside the housing 2, supporting and fixing the position of the frame 13, providing the necessary support force for the frame 13 to slide smoothly inside the housing 2. The frame 13 is slidably connected inside the housing 2 to accommodate the breathable and waterproof membrane 15. The sliding design of the frame 13 allows it to be adjusted as needed to achieve different sealing and ventilation effects. A locking block 14 is fixedly connected to the outer wall of the frame 13, engaging with the locking groove 12 inside the housing 2 to fix and lock the frame 13, preventing it from shifting or falling off during use. The locking blocks 14 are symmetrically arranged on one side and fixedly connected to the outer wall of the frame 13, ensuring their even distribution and allowing the frame 13 to slide stably and lock within the housing 2, increasing the overall stability and safety of the structure. The locking block 14 is slidably connected inside the locking groove 12, allowing the frame 13 to move when needed. However, when the frame 13 is in the appropriate position, the locking block 14 can be tightly engaged in the locking groove 12, thereby preventing accidental displacement of the frame 13. A breathable and waterproof membrane 15 is slidably connected inside the frame 13. The breathable and waterproof membrane 15 prevents water from entering the housing 2 while allowing air circulation. This prevents the intrusion of external moisture or humidity, avoiding affecting the normal operation of the resettable fuse, while keeping the internal environment dry and reducing electrical faults caused by moisture. A second spring 16 is provided inside the frame 13. The second spring 16 provides a certain elastic force to the frame 13, allowing the frame 13 to move smoothly when locking or disengaging. One end of the second spring 16 is fixedly connected inside the frame 13, and the other end is fixedly connected to the top of the support frame 11, ensuring that the spring tension is always effective, helping the frame 13 to spring back to its original position when needed, maintaining the sealing performance and protective effect of the housing 2.

[0035] Specifically, the breathable and waterproof membrane 15 installed inside the housing 2 is breathable to allow air circulation while effectively preventing moisture from entering the housing 2, ensuring that the electronic components inside the housing 2 are protected from moisture damage, thereby improving the overall service life and reliability of the equipment. The breathable and waterproof membrane 15 is securely positioned by the frame 13, which ensures the stable positioning of the membrane 15 within the housing 2 and prevents displacement or damage during use. The frame 13 precisely aligns with the locking groove 12 via the locking block 14, ensuring a firm connection between the waterproof membrane 15 and the housing 2 and preventing external moisture penetration. The locking block 14 slides into the locking groove 12, forming a tight connection with the housing 2, thereby ensuring that the breathable and waterproof membrane 15 always remains in the predetermined position and preventing loosening due to external force or operational errors. At the same time, the design of the frame 13 incorporates a second spring 16, which provides additional support to the frame 13 through its tension, enabling the frame 13 to be securely connected to the locking block 14 and the locking groove 12, enhancing the stability and reliability of the structure. This design not only ensures both breathability and waterproofness, but also guarantees the durability and stability of the shell 2 during long-term use, effectively avoiding the potential risks caused by moisture intrusion.

[0036] Working principle: When using this self-resetting fuse with a protective shell, when installing the shell 2, the shell 2 is placed directly on top of the base 1. Then, the shell 2 is locked into the slot 4 by the locking block 8 on the outer wall of the base 1. When it is necessary to remove the shell 2, pull the removal column 10 to drive the support column 7 to slide in the base 2 3 through the limiting column 6, so that the locking block 8 is separated from the slot 4. Then the shell 2 can be separated from the base 1. When the removal column 10 is released, the locking block 8 will be pushed back to its original position by the tension of the first spring 9, which achieves the effect of facilitating the installation and removal of the shell 2.

[0037] Subsequently, a breathable and waterproof membrane 15 is installed inside the housing 2. It is breathable but prevents water from entering the interior of the housing 2. The breathable and waterproof membrane 15 is limited by the frame 13. The frame 13 slides into the locking groove 12 through the locking block 14 and locks with the housing 2. At the same time, the frame 13 is supported by the tension of the second spring 16, so that the frame 13 can be firmly connected to the locking groove 12 through the locking block 14, thus achieving the effect of breathability and waterproofness.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A self-resetting fuse with a protective casing, comprising a base (1), characterized in that: A fuse body (5) is fixedly connected inside the base (1), a housing (2) is slidably connected to the top of the base (1), a slot (4) is provided inside the housing (2), and a locking component is provided on the outer wall of the base (1). The locking assembly includes a second base (3), the bottom of which is fixedly connected to the outer wall of a first base (1). A limiting post (6) is slidably connected inside the second base (3). A support post (7) is fixedly connected to the outer wall of the limiting post (6). A locking block (8) is fixedly connected to one side of the support post (7). The locking block (8) is engaged with the locking groove (4). A reset assembly is provided between the support post (7) and the second base (3).

2. A self-resetting fuse with a protective casing according to claim 1, characterized in that: The reset assembly includes a first spring (9), which is disposed between the support column (7) and the base (3). One end of the first spring (9) is fixedly connected to the other side of the support column (7), and the other end of the first spring (9) is fixedly connected to the inside of the base (3). A disassembly column (10) is fixedly connected to the other side of the support column (7), and the disassembly column (10) is slidably connected to the inside of the base (3).

3. A self-resetting fuse with a protective casing according to claim 1, characterized in that: The housing (2) has a locking groove (12) inside, and a support frame (11) is fixedly connected inside the housing (2).

4. A self-resetting fuse with a protective casing according to claim 1, characterized in that: The housing (2) has a frame (13) slidably connected inside, and a locking block (14) is fixedly connected to the outer wall of the frame (13).

5. A self-resetting fuse with a protective casing according to claim 4, characterized in that: The locking block (14) is symmetrically arranged on one side and fixedly connected to the outer wall of the frame (13). The locking block (14) is slidably connected inside the locking groove (12).

6. A self-resetting fuse with a protective casing according to claim 4, characterized in that: The frame (13) is slidably connected to a breathable and waterproof membrane (15), and a second spring (16) is provided inside the frame (13).

7. A self-resetting fuse with a protective casing according to claim 6, characterized in that: One end of the second spring (16) is fixedly connected inside the frame (13), and the other end of the second spring (16) is fixedly connected to the top of the support frame (11).

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