A high breaking, high current chip fuse

Abstract

The utility model relates to fuse technology field especially relates to a high breaking, high current paster fuse, including upper casing, lower casing and install between upper and lower casing's fuse body, upper casing and lower casing all adopt ceramic material to make, and the fuse body adopts the integral type bending stamping of conductive material and makes, and the internal cavity of upper casing and lower casing after installation has filled arc extinguishing filler. In the scheme, the upper and lower casing are assembled and fixed as a whole through the mortise and tenon structure, the mortise and tenon structure makes the upper and lower casing firmly combine, and can guarantee the connecting strength of upper and lower casing, reduces the complexity of process connection, can bear greater internal pressure under the breaking condition without separating, increases the breaking performance of product. Compared with the upper and lower casing connection mode of prior art fuse, the connecting strength of the upper and lower casing of mortise and tenon structure is high, and the strength of mechanical connection is more firm than that of adhesive, and the long-term service life is not affected under high temperature. In the breaking test process, stronger internal pressure can be resisted, and the lower casing is not prone to displacement.

Description

Technical Field

[0001] This utility model relates to the field of fuse technology, and in particular to a high breaking capacity, high current patch fuse. Background Technology

[0002] Existing surface mount fuses use a rivet-point design for both the upper and lower housings. This design is complex to manufacture and carries the risk of arc leakage during breaking tests. Another option is a cover-plate design, where the lower and upper housings are connected by adhesive. However, this type of fuse has a small contact area with the fusible element, resulting in insufficient connection strength. This makes it prone to arc leakage or cover plate displacement during breaking. Since adhesives are often organic materials, their temperature resistance is relatively low. However, high-current fuses operate at high temperatures, and prolonged use at these temperatures can lead to adhesive aging, decreased bond strength, cover plate loosening or detachment, and arc-extinguishing medium leakage. In the event of a short circuit, this can prevent safe arc interruption and may even cause a fire. Furthermore, the fusible element is suspended in the upper housing, with a small contact area with the cover-plate lower housing, hindering heat dissipation. Insufficient bond strength also contributes to arcing during breaking, and the adhesive encapsulation can easily leak arcs. Insufficient arc extinguishing capability can also lead to breaking failure and safety accidents. The arc-extinguishing material is applied before the lower housing is installed. This avoids air bubbles being generated during the curing process after filling the arc-extinguishing medium with glue, which would affect the installation and reduce the sealing strength. Utility Model Content

[0003] The purpose of this invention is to provide a high breaking capacity, high current patch fuse to solve the problems encountered in the background art.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A high breaking capacity, high current patch fuse includes an upper housing, a lower housing, and a fusible element installed between the upper and lower housings. Both the upper and lower housings are made of insulating material, and the fusible element is integrally bent and stamped from conductive material. The internal cavity of the upper and lower housings after installation is filled with arc-extinguishing filler.

[0005] In the above scheme, the upper shell and the lower shell are connected by a tenon and mortise structure, and after the upper shell and the lower shell are installed, the melt is sealed in the inner cavity.

[0006] In the above design, a mortise is provided on one side of the top of the upper housing, and a tenon that mates with the mortise is provided on one side of the top of the lower housing. A step is provided on the other side of the top of the upper housing, and a plug that mates with the step is provided on one side of the top of the lower housing; both the step and the mortise are located on the adjacent wall of the upper housing.

[0007] In the above solution, the top of the lower housing is provided with a cover plate, the top of the mortise is provided with a cavity to accommodate the cover plate, and the top of the step is provided with a slot to accommodate the cover plate. As a preferred embodiment, the step is a groove-shaped structure, and the plug is a boss-shaped strip structure; the mortise is a trapezoidal cavity structure, and the tenon is a trapezoidal structure. Limiting blocks are provided on both sides of the mortise, and the limiting blocks are triangular in structure.

[0008] In practice, to secure the mortise and tenon structure, in the above solution, a limiting pin is installed on the top side of the cover plate near the tenon, and the limiting pin passes through the tenon and is fixedly connected to the mortise.

[0009] In the above scheme, positioning grooves are respectively provided on the upper inner sides of the two side walls of the upper shell, and the two sides of the melt are installed in the positioning grooves and hung on the top of the two side walls.

[0010] In the above scheme, the melt includes a connecting part and an electrode part. There is at least one connecting part, which is connected in the middle through a narrow section. The outer side of the connecting part is integrally connected to the electrode part, and the electrode part is closely attached to the inner side of the positioning groove.

[0011] In the above scheme, a suspension part is provided on the outer side of the electrode part, and the suspension part is hung on the top of the two side walls. The suspension part has a U-shaped structure, and an integrally connected terminal part is provided on the outer end of the suspension part. At least one slot is opened in the narrow section, and the edge of the slot is bounded by the inner side of the rod-shaped narrow section and the connecting part. A clearance groove is provided on the outer side of the narrow section. The thickness of the narrow section is not greater than the thickness of the connecting part.

[0012] Compared with existing technologies, the beneficial effects of this utility model are as follows: In this solution, the upper and lower shells are assembled and fixed as a whole by a mortise and tenon structure. The mortise and tenon structure ensures a firm connection between the upper and lower shells and guarantees the connection strength, reducing the complexity of the process connection. It can withstand greater internal pressure under short-circuit conditions without separation, thus increasing the product's breaking performance. Compared with the existing upper and lower shell connection methods of fuses, the mortise and tenon structure has higher connection strength, the mechanical connection is stronger than adhesive, and it has higher temperature resistance. In actual breaking tests, it can withstand stronger internal pressure, and under long-term high-temperature application environments, there will be no loosening or displacement of the lower shell, significantly improving the product's breaking capacity and reliability. Attached Figure Description

[0013] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is an exploded view of the present invention; Figure 3 This is a schematic diagram of the upper shell structure in this utility model; Figure 4 This is a top view of the upper shell of this utility model; Figure 5 This is a schematic diagram of the lower shell structure of this utility model; Figure 6 This is a schematic diagram of the melt structure in this utility model; Figure 7 for Figure 1 Schematic diagram of section aa; Figure 8 for Figure 1 Schematic diagram of the bb section structure.

[0014] The following numbers are used in the diagram: 1-Upper shell; 11-Tongue; 12-Positioning groove; 13-Limiting block; 14-Side wall; 15-Step; 16-Slot; 17-Adjacent wall; 2-Lower shell; 21-Tongue; 22-Plug; 23-Cover plate; 3-Melted material; 31-Connecting part; 32-Narrow section; 33-Electrode part; 34-Suspension part; 35-Terminal part; 36-Slot; 37-Allowing groove. Detailed Implementation

[0015] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the utility model will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of this utility model, and therefore only show the relevant components of this utility model.

[0016] Based on the technical solution of this utility model, without changing the essential spirit of this utility model, those skilled in the art can propose various interchangeable structural methods and implementation methods. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model, and should not be regarded as the entirety of this utility model or as a limitation or restriction of the technical solution of this utility model.

[0017] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0018] Example 1, as Figure 1 , Figure 2 , Figure 7 , Figure 8As shown, a high breaking capacity, high current surface mount fuse includes an upper housing 1, a lower housing 2, and a fusible element 3 installed between the upper housing 1 and the lower housing 2. When the upper housing 1 and the lower housing 2 are fixedly installed, the fusible element 3 is pressed tightly into the cavity. Both the upper housing 1 and the lower housing 2 are made of insulating material, which can be ceramic, plastic, glass, bakelite, or other inorganic insulating materials. The preferred material for both housings is ceramic, such as alumina or alumina-toughened ceramic.

[0019] The melt 3 is made of conductive material through a one-piece bending and stamping process, typically using copper or aluminum sheets. It melts during operation, thus protecting the stability of the circuit. The internal cavity of the upper housing 1 and lower housing 2 after installation is filled with arc-extinguishing filler, typically silica sand (silicon dioxide), a common type of arc-extinguishing material. This filler is also used to protect the circuit and reduce the damage caused by electric arcs.

[0020] In this design, the upper shell 1 and the lower shell 2 are connected by a mortise and tenon structure. After installation, the upper shell 1 and the lower shell 2 seal the melt 3 within the inner cavity. In this design, the upper and lower shells are assembled and fixed as a whole by the mortise and tenon structure. The mortise and tenon structure ensures a firm connection between the upper and lower shells and guarantees the connection strength, reduces the complexity of the process connection, and can withstand greater internal pressure under fracture conditions without separation, thus increasing the product's fracture performance.

[0021] Compared to existing fuse connections, the mortise and tenon joint structure offers higher strength, with the mechanical connection being more robust than adhesive bonding. It can withstand greater internal pressure during breakage tests, and the lower shell is less prone to displacement.

[0022] The upper shell 1 has a mortise 11 on one side of its top, and the lower shell 2 has a tenon 21 on one side of its top that mates with the mortise 11. During assembly, the molten body 3 is suspended above the upper shell 1, and the lower shell 2 is connected to the structure by inserting the tenon 21 into the mortise 11.

[0023] A step 15 is provided on the other side of the top of the upper housing 1, and a plug 22 that mates with the step 15 is provided on one side of the top of the lower housing 2. During installation, an adhesive layer is applied to the step 15, and the plug 22 is inserted into the step 15. Both the step 15 and the mortise 11 are located on the adjacent wall 17 of the upper housing 1. For example, if the mortise 11 is provided at the front of the adjacent wall 17, then the step 15 is provided on the adjacent wall 17 on the other side.

[0024] In this design, the melt 3 is suspended above the upper shell 1, and the upper and lower shells are connected by a tenon and mortise structure. The upper shell 1 has adhesive and steps 15 on both sides to increase the bonding strength and contact area of ​​the upper and lower shells, which can effectively prevent arc leakage during the breaking test and achieve higher breaking capacity.

[0025] Example 2, based on Example 1, please refer to... Figure 5 A cover plate 23 is provided on the top of the lower housing 2, and the cover plate 23 is the main body of the lower housing 2. The plug 22 is located on one side of the bottom of the cover plate 23, and the tenon 21 is located on the other side of the bottom of the cover plate 23. The top of the mortise 11 has a cavity to accommodate the cover plate 23, and the top of the step 15 has a slot 16 to accommodate the cover plate 23. When the lower housing 2 is installed, the cover plate 23 is first inserted into the mortise 11, and then pushed flat into the step 15, and the end is pressed against the slot 16.

[0026] As a preferred embodiment, step 15 has a groove-like structure, and plug 22 has a boss-like strip structure. Step 15 is provided at the connection between the upper housing 1 and the lower housing 2. After the upper and lower housings fit together, their concave and convex shapes overlap, sealing the connection and preventing arc leakage. Adhesive is applied to both sides of step 15 on the upper housing 1, and the lower housing 2 is bonded to it using the adhesive, enhancing the bonding strength at the connection and improving the service life of the fuse.

[0027] Example 3, please refer to Figure 3 Based on Example 1, the mortise and tenon structure can be a commonly used structure. For ease of implementation, the following design can be adopted: the mortise 11 is a trapezoidal cavity structure, and the tenon 21 is a trapezoidal structure. By setting the mortise 11 and tenon 21 to be trapezoidal, the movement of the upper and lower shells in the vertical direction is restricted by the two sides of the trapezoid. Combined with the cooperation of the step 16 and the plug 22, the movement of the upper and lower shells in the vertical direction is further restricted, which can improve the installation strength of both and restrict the forward and backward movement after installation.

[0028] As a preferred solution, limiting blocks 13 are provided on both sides of the tenon 11. The limiting blocks 13 have a triangular structure and are used to restrict the lower housing 2 from continuing to push inward. When the inner side of the tenon 21 contacts the limiting block 13, it means that the installation is in place. Therefore, the fuse is very easy to install, which has the functions of high stability and preventing displacement, as well as the technical effect of convenient assembly, thus improving assembly efficiency.

[0029] Although inserting the upper housing 1 into the lower housing 2 can be accomplished by pushing it horizontally, and during use, adhesive is also provided at the step 16 to prevent the lower housing 2 from moving out of the mortise and tenon structure, as a preferred solution, a limiting pin (not shown) is installed on the top of the cover plate 23 near the tenon 21. The limiting pin passes through the tenon 21 and is fixedly connected to the mortise 11. A cylindrical limiting pin is inserted into the tenon 21 and extends to the mortise 11, thereby preventing the lower housing 2 from moving out of the mortise and tenon structure and improving the stability after the upper and lower housings are assembled by pushing.

[0030] Example 4, based on Example 1, please refer to... Figure 3 and Figure 4The upper inner sides of the two side walls 14 of the upper housing 1 are respectively provided with positioning grooves 12. The two sides of the melt 3 are installed in the positioning grooves 12 and hung on the top of the two side walls 14. During installation, in order to improve stability, the melt 3 is fixed to the upper housing 1 with adhesive.

[0031] Please refer to Figure 6 The melt 3 includes a connecting portion 31 and an electrode portion 33. At least one connecting portion 31 is provided, connected in the middle by a narrow section 32. The outer side of the connecting portion 31 is integrally connected to the electrode portion 33, which is tightly fitted to the inner side of the positioning groove 12. The positioning groove 12 restricts the installation position of the melt 3, placing it in the center position, and the melt 3 can be fixed by applying an adhesive layer to the positioning groove 12. The melt 3 adopts an integrated fuse design, eliminating the need for solder welding, and can pass AECQ testing, demonstrating high reliability.

[0032] A suspension part 34 is provided on the outer side of the electrode part 33, and the suspension part 34 is hung on the top of the two side walls 14. The suspension part 34 has a U-shaped structure, and an integrally connected terminal part 35 is provided on the outer end of the suspension part 34. The terminal part 35 is used to connect the power supply. When a short circuit occurs, the narrow diameter part 32 of the fuse 3 melts, thereby protecting the circuit system.

[0033] As a preferred embodiment, at least one slot 36 is formed in the narrow section 32. The edge of the slot 36 is bounded by the inner side of the rod-shaped narrow section 32 and the connecting section 31. The narrow section 32 is rod-shaped at this point to facilitate subsequent overload fusing. A clearance groove 37 is provided on the outer side of the narrow section 32 to further reduce the width of the narrow section 32 and enable it to better protect the circuit. The thickness of the narrow section 32 is not greater than the thickness of the connecting section 31, thereby allowing the fuse 10 to act more quickly against fault current and to fuse when the rated current exceeds the current, thus having a high segmentation function.

[0034] This design uses a mortise and tenon joint to connect the upper and lower shells, increasing the connection strength and reducing the use of adhesives. The arc-extinguishing material filler is completed before the lower shell 2 is installed, preventing air bubbles from forming after filling the sand holes and reducing manufacturing risks.

[0035] By using a mortise and tenon structure for the upper and lower housings, the connection strength is increased. The breaking capacity, achieved through a combination of structure and arc-extinguishing materials, is increased from the existing 2KA at 80V to 25KA at 80V; the voltage is increased from 80V to 125V; the breaking capacity at 125V reaches 10KA; and the rated current is increased from the existing 125A to 300A. Therefore, this invention can be used in circuit protection applications requiring higher current and higher breaking capacity. It effectively avoids housing displacement and arc leakage risks during short-circuit protection, reducing damage to surrounding components. The ceramic mortise and tenon structure increases the connection strength between the upper and lower housings, increasing the tensile strength from 150N to over 450N. Furthermore, it improves the product's reliability at high temperatures.

[0036] In summary, in this design, the upper and lower shells are assembled and fixed together using a mortise and tenon structure. This structure ensures a firm connection between the upper and lower shells, guarantees their connection strength, reduces the complexity of the manufacturing process, and allows the fuse to withstand greater internal pressure under short-circuit conditions without separation, thus increasing the product's breaking capacity. Compared to existing fuse connection methods, the mortise and tenon structure offers higher connection strength, with mechanical connections being stronger than adhesives and exhibiting higher temperature resistance. During actual breaking, it can withstand stronger internal pressure, and under long-term high-temperature applications, there will be no loosening or displacement of the lower shell, significantly improving the product's breaking capacity and reliability.

[0037] In terms of application, the surface mount fuse in this application has a high breaking capacity and can be used for overcurrent protection in power distribution units of high-power data center computer rooms, new energy vehicles, power tools and other low-voltage high-current scenarios.

[0038] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. These undisclosed elements are all prior art known to those skilled in the art.

[0039] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A high breaking, high current chip fuse comprising an upper housing (1), a lower housing (2) and a fuse body (3) mounted between the upper housing (1) and the lower housing (2), characterized in that: The upper shell (1) and the lower shell (2) are connected by a tenon and mortise structure. After the upper shell (1) and the lower shell (2) are installed, the melt (3) is sealed in the inner cavity.

2. A high interrupting, high current chip fuse according to claim 1, characterized in that: The upper shell (1) has a mortise (11) on one side of its top, and the lower shell (2) has a tenon (21) on one side of its top that matches the mortise (11).

3. A high interrupting, high current chip fuse according to claim 2, characterized in that: A step (15) is provided on the other side of the top of the upper housing (1), and a plug (22) that matches the step (15) is provided on one side of the top of the lower housing (2); the step (15) and the mortise (11) are both located on the adjacent wall (17) of the upper housing (1).

4. A high interrupting, high current chip fuse according to claim 3, wherein: The lower housing (2) is provided with a cover plate (23) on the top, the mortise (11) is provided with a cavity to accommodate the cover plate (23) on the top, and the step (15) is provided with a slot (16) to accommodate the cover plate (23) on the top.

5. A high interrupting, high current chip fuse according to claim 3, wherein: The step (15) is a groove-shaped structure, the plug (22) is a boss-shaped strip structure, and an adhesive is coated on the step (15).

6. A high interrupting, high current chip fuse according to claim 2, wherein: The mortise (11) is a trapezoidal hollow structure, and the tenon (21) is a trapezoidal structure.

7. A high interrupting, high current chip fuse according to claim 6, wherein: The mortise (11) is provided with limiting blocks (13) on both sides, and the limiting blocks (13) are triangular in structure.

8. A high interrupting, high current chip fuse according to claim 4, wherein: A limiting pin is installed on the top side of the cover plate (23) near the tenon (21), and the limiting pin passes through the tenon (21) and is fixedly connected to the mortise (11).

9. A high interrupting, high current chip fuse according to claim 1, wherein: The upper part of the inner side of the two side walls (14) of the upper shell (1) is provided with positioning grooves (12), and the two sides of the melt (3) are installed in the positioning grooves (12) and hung on the top of the two side walls (14).

10. A high interrupting, high current chip fuse according to claim 9, wherein: The melt (3) includes a connecting part (31) and an electrode part (33). The connecting part (31) has at least one part and is connected in the middle by a narrow section (32). The outer side of the connecting part (31) is integrally connected with the electrode part (33). The electrode part (33) is closely attached to the inner side of the positioning groove (12).

11. A high interrupting, high current chip fuse according to claim 10, wherein: The electrode part (33) is provided with a suspension part (34) on the outside, and the suspension part (34) is hung on the top of the two side walls (14).

12. A high interrupting, high current chip fuse according to claim 11, wherein: The suspension part (34) has a U-shaped structure, and the outer end of the suspension part (34) is provided with an integrally connected terminal part (35).

13. A high interrupting, high current chip fuse according to claim 10, wherein: At least one slot (36) is provided in the narrow section (32), and the edge of the slot (36) is bounded by the inner side of the rod-shaped narrow section (32) and the connecting part (31).

14. A high interrupting, high current chip fuse according to claim 13, wherein: The narrow section (32) is provided with a clearance groove (37) on its outer side.

15. A high interrupting, high current chip fuse according to claim 10, wherein: The thickness of the narrow portion (32) is not greater than the thickness of the connecting portion (31).

16. A high interrupting, high current chip fuse according to claim 1, wherein: The upper shell (1) and the lower shell (2) are both made of ceramic material. The melt (3) is made of conductive material by integral bending and stamping. The internal cavity of the upper shell (1) and the lower shell (2) after installation is filled with arc-extinguishing filler.

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