Novel small tubular fuse holder

Abstract

The utility model relates to a fuse technology field discloses a novel small -size tubular fuse holder, including the shell, the inside of shell is provided with tubular fuse, the bottom of tubular fuse is provided with the second electrically conductive part, is provided with the spring between the second electrically conductive part and shell bottom, the top of shell is connected with the upper cover of screw thread, is provided with the elastic clamp between the upper cover and tubular fuse, the outside of elastic clamp is equipped with the first electrically conductive part. The utility model is applicable to a novel small -size tubular fuse holder, through the inside and outside thread connection of upper cover and shell, has reduced copper stud and copper nut, and the shell mould structure design optimization is improved simultaneously, the traditional internal thread demolding structure is improved, realizes batch production manufacturing feasibility, also is convenient for automatic injection moulding production, improves production efficiency, reduces material and artificial cost, reduces quality control difficulty simultaneously, improves product quality.

Description

Technical Field

[0001] This utility model relates to the field of fuse technology, specifically a novel small tubular fuse holder. Background Technology

[0002] Miniature tubular fuse holders (fuse supports for miniature tubular fuse elements) are widely used in various industries, including industrial equipment, instruments, medical devices, and household appliances. Existing miniature tubular fuse holders mostly use phenolic resin for the housing and top cover, with embedded copper nuts and studs. This results in high material costs, low insert processing efficiency, high material and labor costs, and is also unfavorable for automated production.

[0003] In recent years, with increasingly fierce competition in domestic and international markets, the market demand for low-cost, high-quality products has grown stronger. Innovation and cost reduction are the eternal goals of enterprises. This project will upgrade and improve existing products in terms of structural design, material selection, and processing technology to meet market demands and enhance product competitiveness. Utility Model Content

[0004] This invention provides a novel small tubular fuse holder, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A novel small tubular fuse holder includes a housing, inside which a tubular fuse is disposed, and at the bottom of the tubular fuse is a second conductive element. A spring is disposed between the second conductive element and the bottom of the housing. A top cover is threaded to the top of the housing, and an elastic clip is disposed between the top cover and the tubular fuse. A first conductive element is sleeved on the outside of the elastic clip.

[0007] As a preferred embodiment of this utility model, an O-ring is provided between the top cover and the outer shell.

[0008] As a preferred embodiment of this utility model, a thrust nut is threadedly connected to the bottom of the outer shell, and a plastic washer that mates with the thrust nut is fitted on the outer side of the outer shell.

[0009] As a preferred technical solution of this utility model, the top of the elastic clip is provided with an elastic arm that cooperates with the upper cover, the two sides of the elastic arm are provided with anti-rotation protrusions, the middle of the elastic clip is provided with a pre-tightening clip that cooperates with the tubular fuse, and the outer side of the elastic clip is provided with an anti-disengagement clip.

[0010] As a preferred embodiment of this utility model, the top cover, outer shell, thrust nut, and plastic washer are all made of thermoplastic plastic.

[0011] The present invention has the following advantages:

[0012] This utility model applies to a novel small tubular fuse holder. By connecting the upper cover and the outer shell with internal and external threads, the number of copper studs and copper nuts is reduced. At the same time, the design of the outer shell mold structure is optimized, improving the traditional internal thread demolding structure, realizing the feasibility of mass production, facilitating automated injection molding production, improving production efficiency, reducing material and labor costs, reducing the difficulty of quality control, and improving product quality. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of a novel small tubular fuse holder.

[0015] Figure 2 This is an exploded view of a novel small tubular fuse holder.

[0016] Figure 3 This is a cross-sectional view of a novel small tubular fuse holder.

[0017] Figure 4 This is a schematic diagram of the structure of a novel small tubular fuse holder in which a tubular fuse and an elastic clip are fitted together.

[0018] In the diagram: 1. Top cover; 2. O-ring seal; 3. Elastic clip; 4. Tubular fuse; 5. First conductive element; 6. Second conductive element; 7. Spring; 8. Outer shell; 9. Plastic washer; 10. Thrust nut; 11. Anti-rotation bulge; 12. Preload clip; 13. Anti-disengagement clip; 14. Elastic arm. Detailed Implementation

[0019] 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.

[0020] In one embodiment, see Figures 1-4A novel miniature tubular fuse holder includes a housing 8, inside which a tubular fuse 4 is housed. A second conductive element 6 is located at the bottom of the tubular fuse 4. A spring 7 is positioned between the second conductive element 6 and the bottom of the housing 8. The housing 8 is made of reinforced nylon and is a stepped cylindrical shape with a circular stepped hole inside. The first conductive element 5, spring 7, and second conductive element 6 are respectively installed in this hole. An internal thread at the top of the circular hole matches the external thread of a top cover 1. After the top cover 1 is locked, an O-ring seal 2 is pre-pressed against the upper end face of the stepped inner circle of the housing 8 to achieve IPX5 waterproofing. An external thread on the outside of the housing 8 matches and locks in place with a mounting nut. The second conductive element 6 is made of brass with a tin-plated surface and has a snap-fit ​​structure. It is installed at the bottom of the housing 8 together with the spring 7. Under the elastic force of the spring 7, it achieves Z-axis elastic movement and elastically contacts the end of the tubular fuse 4. The exposed pins can be connected to external input / output current. The spring 7 and the second conductive element 6 are installed together at the bottom of the stepped hole in the housing 8. The spring force ensures reliable and secure contact between the second conductive element 6 and the tubular fuse 4 without any loosening. The tubular fuse 4 is a standard part, and the corresponding specifications and models can be purchased on the market as needed.

[0021] In one embodiment, the top of the outer casing 8 is threadedly connected to a top cover 1. An elastic clip 3 is provided between the top cover 1 and the tubular fuse 4. A first conductive element 5 is sleeved on the outer side of the elastic clip 3. The top cover 1 is made of reinforced nylon material, with a circular cap shape at the top, straight teeth on the outer circle, and characters printed on the surface. The lower cylindrical part has a circular central hole, and there are snap-fit ​​holes on both sides of the circular hole. The elastic clip 3 is installed in the circular hole. The elastic snaps on both sides of the elastic clip 3 lock with the snap-fit ​​holes to prevent it from falling off. The outer circle of the cylindrical part has an external thread, which can be connected to the internal thread of the outer casing 8. An O-ring mounting groove is provided at the root of the external thread, and an O-ring 2 is installed in the groove. The elastic clip 3 is made of elastic tin bronze with a tin-plated surface. It is a circular tubular shape and serves as the movable carrier for installing the tubular fuse 4. Elastic clips on both sides of the inner circle prevent the tubular fuse 4 from falling off. Two elastic arms 14 with a stroke of 0.8mm are located at the upper end, ensuring that after the upper cover 1 and the outer shell 8 are threaded together, the elastic clip 3 makes elastic contact with the first conductive component 5 reliably without loosening. The lower end of the elastic clip 3 has six contact feet, ensuring a sufficiently large contact area between the elastic clip 3 and the first conductive component 5 after the upper cover 1 and the outer shell 8 are threaded together. Simultaneously, elastic buckles are located on both sides of the lower part of the elastic clip 3, which, when engaged with the buckle holes of the upper cover 1, prevent the elastic clip 3 from falling off after pre-installation. The first conductive component 5 is made of brass with a tin-plated surface. Through a buckle structure and a barbed structure, it is installed in the center of the inner circular hole of the stepped outer shell 8. The circular end face can contact the six contact feet at the lower end of the elastic clip 3, and the exposed pins can be connected to external input / output current.

[0022] In one embodiment, an O-ring 2 is provided between the upper cover 1 and the outer shell 8. The O-ring 2 is installed at the root of the external thread of the upper cover 1. After the upper cover 1 and the outer shell 8 are locked together, the fuse holder can achieve an IPX5 waterproof rating, meeting the requirements for long-term use of the product in humid and hot environments.

[0023] In one embodiment, a thrust nut 10 is threaded to the bottom of the outer casing 8, and a plastic washer 9 that mates with the thrust nut 10 is fitted onto the outer side of the outer casing 8. The plastic washer 9 is fitted onto the threads of the fuse holder outer casing 8 and installed on the outside of the instrument housing, ensuring that the fuse holder head has IPX5 waterproof performance, preventing external water from entering the instrument interior, and is suitable for humid and hot environments. The thrust nut 10 is made of reinforced nylon and has an anti-rotation wedge at its end, enabling the fuse holder to be fixed to the instrument housing, and can replace metal nuts and metal washers.

[0024] In one embodiment, the top cover 1, outer shell 8, thrust nut 10, and plastic washer 9 are all made of flame-retardant reinforced nylon that meets the UL94-V0 flame-retardant standard and does not ignite at 750°C on a glow wire. This material is a thermoplastic, and its injection molding gate material can be reused, resulting in high material utilization, reduced costs, and the product can also be recycled and reused. This meets the flame-retardant and environmental protection requirements of relevant international and national environmental regulations such as RoHS and REACH, and also meets the electrical performance requirements of the product in GBT 9364.6-2023 "Miniature Fuses Part 6: Fuse Supports for Miniature Fuses".

[0025] In one embodiment, the top of the elastic clip 3 is provided with an elastic arm 14 that cooperates with the upper cover 1, and anti-rotation protrusions 11 are provided on both sides of the elastic arm 14. The middle part of the elastic clip 3 is provided with a pre-tightening clip 12 that cooperates with the tubular fuse 4, and the outer side of the elastic clip 3 is provided with an anti-disengagement clip 13. The elastic clip 3 has two guide anti-rotation protrusions 11 at its top, which have axial guidance and radial anti-rotation functions to ensure that the elastic clip 3 maintains Z-direction elastic movement; the elastic clip 3 has two elastic arms 14 at its top, with an elastic stroke of 0.8-1.0mm. After the upper cover 1 and the outer shell 8 are locked, it can effectively ensure that the elastic clip 3 and the first conductive component 5 are in elastic contact without loosening; the elastic clip 3 has two pre-tightening clips 12, which will not fall off under the pre-tightening force after the fuse is pre-installed; two anti-disengagement buckles 13 are set on both sides of the outer circle of the elastic clip 3 to ensure that the elastic clip 3 and the fuse will not fall off after being pre-installed in the center hole of the upper cover 1, which is convenient for assembly; therefore, the elastic clip 3 can replace the copper stud + copper nut + elastic clip in the existing structure, realize the three functions in one, and reduce material costs and production time costs.

[0026] In this embodiment, the tubular fuse 4 is pre-installed in the elastic clip 3 inside the upper cover 1, with one end of the tubular fuse 4 in elastic contact with the elastic clip 3. The O-ring 2 is pre-installed at the root of the thread on the upper cover 1. When the upper cover 1 is locked to the internal thread of the outer shell 8, the elastic clip 3 is in elastic contact with the first conductive element 5, and the O-ring 2 is compressed to achieve waterproofing. At the same time, the second conductive element 6 is in elastic contact with the other end of the tubular fuse 4 under the elastic force of the spring 7, forming a circuit: first conductive element 5 → elastic clip 3 → tubular fuse 4 → second conductive element 6. The exposed pins of the first conductive element 5 and the second conductive element 6 are connected to the external circuit, and the current flows through the fuse to achieve melting under circuit overload conditions, protecting the relevant electrical appliances.

[0027] This utility model applies to a novel small tubular fuse holder. By connecting the upper cover 1 and the outer shell 8 with internal and external threads, the number of copper studs and copper nuts is reduced. At the same time, the mold structure design of the outer shell 8 is optimized, improving the traditional internal thread demolding structure, realizing the feasibility of mass production, facilitating automated injection molding production, improving production efficiency, reducing material and labor costs, reducing the difficulty of quality control, and improving product quality.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A novel small tubular fuse holder, characterized in that, The device includes an outer casing, inside which is a tubular fuse. At the bottom of the tubular fuse is a second conductive element. A spring is provided between the second conductive element and the bottom of the outer casing. A top cover is threaded to the top of the outer casing. An elastic clip is provided between the top cover and the tubular fuse. A first conductive element is sleeved on the outside of the elastic clip.

2. The novel miniature tubular fuse holder according to claim 1, characterized in that, An O-ring is provided between the top cover and the outer shell.

3. A novel miniature tubular fuse holder according to claim 1, characterized in that, The bottom of the outer casing is threaded with a thrust nut, and a plastic washer that mates with the thrust nut is fitted on the outside of the outer casing.

4. A novel miniature tubular fuse holder according to claim 1, characterized in that, The elastic clip has an elastic arm at the top that mates with the top cover, anti-rotation protrusions on both sides of the elastic arm, a pre-tightening clip in the middle that mates with the tubular fuse, and an anti-disengagement clip on the outer side of the elastic clip.

5. A novel miniature tubular fuse holder according to claim 3, characterized in that, The top cover, outer shell, thrust nut, and plastic washer are all made of thermoplastic plastic.

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