CN211265400U

CN211265400U - Surface-mounted miniature fuse

Info

Publication number: CN211265400U
Application number: CN202020042622.1U
Authority: CN
Inventors: 邱鸿智; 邱柏硕
Original assignee: Conquer Electronics Co Ltd
Current assignee: Conquer Electronics Co Ltd
Priority date: 2020-01-09
Filing date: 2020-01-09
Publication date: 2020-08-14
Anticipated expiration: 2030-01-09

Abstract

The utility model relates to a surface mounting formula miniature fuse, it has the conductive fuse who sets up in the casing, this conductive fuse has fusing portion and connects in the intermediary portion at fusing portion both ends, fusing portion has the clearance with intermediary portion department of meeting, when making conductive fuse melt because of abnormal current in the twinkling of an eye, produce great interval in the twinkling of an eye because of the setting in clearance between the two intermediary portions to prevent the production of electric arc, and then effectively ensure whole circuit's safety in utilization.

Description

Surface-mounted miniature fuse

Technical Field

The present invention relates to a micro fuse, and more particularly to a micro fuse using surface mount technology.

Background

The fuse, also called fuse or fuse link, is installed in the circuit, and the fuse has a conductive fuse wire to form a series connection with the protected circuit, when the current in the circuit abnormally rises and exceeds the rated current, the conductive fuse wire is blown out due to overheating, and the circuit operation is interrupted, thereby ensuring the electricity safety. When the conductive fuse is blown, because the electric field intensity at the two ends of the break point is still large, the air which is originally an insulating medium can be punctured, and an electric arc can be generated, so that the circuit is not interrupted and the due effect of the fuse is lost. In the prior art, arc extinguishing materials are arranged outside the conductive fuse, which all reduce the probability of generating an arc by the conductive fuse under the influence of external influences or can quickly extinguish the arc effect when the arc is generated, but when the electric field intensity is too high, the external arc extinguishing is still slow and inconvenient, so that the fusing of the conductive fuse cannot immediately form circuit interruption.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a surface mounting type miniature fuse is provided, the structure to the conductive fuse is researched and developed to make the structure of conductive fuse itself have the efficiency of arc extinguishing promptly.

In order to achieve the above object, the utility model provides a surface mounting type miniature fuse, it includes:

a housing having an interior space;

the conductive fuse wire is arranged in the shell and provided with a fusing part, two intermediary parts and two conductive parts, the fusing part is arranged in the inner space of the shell, two ends of the fusing part are respectively connected with the intermediary parts, each intermediary part is connected between the fusing part and the corresponding conductive part, each end face of the fusing part is provided with a first section and at least one second section, the first section of the fusing part is not connected with the end face of the corresponding intermediary part and is provided with a gap, the second section of the fusing part is connected with the end face of the corresponding intermediary part, and the conductive parts extend out of the shell;

a first packaging material, which is made of flame-retardant material and filled in the inner space of the housing, and covers the fusing part of the conductive fuse and at least part of the intermediate part.

The utility model has the beneficial effects that: the gap between the fusing part and the intermediate part of the conductive fuse is arranged, so that when the conductive fuse is fused, the distance between the two intermediate parts can be instantly increased through the gap to immediately prevent the generation of electric arcs, and therefore, the purpose of effectively preventing the generation of the electric arcs can be achieved through the structural design of the conductive fuse, and the final purpose of maintaining the safety of circuits is achieved.

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.

Drawings

FIG. 1 is a perspective view of the present invention;

fig. 2 is another perspective view of the present invention;

fig. 3 is a perspective sectional view of the present invention;

fig. 4 is a top view of the conductive fuse of the present invention;

fig. 5 is a perspective cross-sectional view of another embodiment of the present invention;

FIG. 6 is a top sectional view of the present invention;

fig. 7 is a top sectional view of the conductive fuse of the present invention when blown.

Wherein, the reference numbers:

10: housing 11: inner space

12 annular wall 121 main wall

122 side wall face 123 end wall face

13, opening 20, conductive fuse

21 fusing part 211 first segment

212 second section 22 intermediate section

23 conductive parts 24 gaps

30 first sealing material 40 second sealing material

Detailed Description

The following describes the structural and operational principles of the present invention in detail with reference to the accompanying drawings:

the technical solutions adopted by the present invention to achieve the intended purpose are further illustrated below in conjunction with the accompanying drawings and embodiments of the present invention, wherein the drawings have been simplified for illustrative purposes only, and the structure or method of the present invention is illustrated by describing the relationship between the elements and components of the present invention, so that the elements shown in the drawings are not presented in actual number, actual shape, actual size, and actual proportion, and the size or size proportion has been enlarged or simplified, thereby providing a better illustration, and the actual number, actual shape, or actual size proportion has been selectively designed and configured, and the detailed layout of the elements may be more complicated.

Referring to fig. 1 to 3, the present invention includes a housing 10, a conductive fuse 20, a first packaging material 30, and a second packaging material 40.

The housing 10 is hollow and has an inner space 11, a ring wall 12 and an opening 13, the ring wall 12 surrounds the inner space 11 and has a main wall 121, two side walls 122 and two end walls 123, the two side walls 122 are disposed on two opposite edges of the main wall 121, the two end walls 123 are disposed on the other two opposite edges of the main wall, the two side walls 122 and the two end walls 123 surround the inner space 11, and the opening 13 is communicated with the inner space 11 and is located between the end edges of the side walls 122 and the end walls 123. In one embodiment, the housing 10 is made of ceramic.

Referring to fig. 3 and 4, the conductive fuse 20 is disposed in the housing 10, the conductive fuse 20 includes a fuse portion 21, two intermediate portions 22 and two conductive portions 23, the fuse portion 21 is disposed in the internal space 11 of the housing 10, two ends of the fuse portion 21 are respectively connected to the intermediate portions 22, each intermediate portion 22 is connected between the fuse portion 21 and the corresponding conductive portion 23, at least a portion of each intermediate portion 22 is disposed in the internal space 11 of the housing 10, each end surface of the fuse portion 21 has a first section 211 and at least a second section 212, the first section 211 of the fuse portion 21 is not connected to the end surface of the corresponding intermediate portion 22 and has a gap 24, and the second section 212 of the fuse portion 21 is connected to the end surface of the corresponding intermediate portion 22. In one embodiment, the fuse portion 21 has two second segments 212, and the second segments 212 are respectively located at two sides of the first segment 211, so that two ends of the fuse portion 21 are connected to the end surfaces of the intermediate portion 22 through the second segments 212 at two sides, and the first segment 211 located at the middle portion is separated from the intermediate portion 22 to form the gap 24. The conductive portions 23 extend from the opening 13 of the housing 10 to the outside of the housing 10 and respectively abut against the end wall surfaces of the housing 10. In one embodiment, the intermediate portion 22 is inclined, i.e. not parallel to the end wall surface 123 of the housing 10, so that the fuse portion 21 is spaced apart from the opening 13 of the housing 10. In one embodiment, the conductive fuse 20 may be integrally formed, or the fusing portion 21 may be made of different materials. In another embodiment (as shown in fig. 5), a metal layer with a lower melting point may be plated outside the conductive fuse 20, and the fusing portion 21 starts to generate a fusing effect at a lower temperature than that of the general fusing condition by the arrangement of the metal layer with the lower melting point, so that the overall energy is also smaller due to the lower fusing temperature, and the electric field strength is lower, thereby reducing the probability of generating an arc.

Referring to fig. 3, the first encapsulant 30 is filled in the housing 10 and covers the fusing portion 21 of the conductive fuse 20 and at least a portion of the intermediate portion 22, and the first encapsulant 30 has flame retardant and arc extinguishing properties. In one embodiment, the first sealing material 30 may be quartz sand, explosion-proof sand, or a mixture of a flame retardant and an epoxy resin, and the flame retardant may be melamine, magnesium hydroxide, aluminum hydroxide, or the like.

The second encapsulant 40 is disposed at the opening 13 of the housing 10 for blocking the space between the first encapsulant 30 and the outside, and the second encapsulant 40 and the first encapsulant 30 are made of different materials, and the second encapsulant 40 has a heat-resistant property. In one embodiment, the second encapsulant 40 may be silicon gel, Polyimide (PI), or the like.

Referring to fig. 6 and 7, in normal use, the fuse portion 21 of the conductive fuse 20 maintains its integrity, so that the series circuit can keep normal operation, but when the current abnormally rises to exceed the rated current, the fusing part 21 of the conductive fuse 20 is overheated and fused, based on the gap 24 between the first segment 211 of the fusing part 21 and the interposing part 22, when the fuse is blown, the distance between the two intermediate portions 22, in addition to the distance generated by the blowing of the fuse portion 21, is also increased by the provision of the gap 24, the distance between the two intermediate portions 22 is increased instantaneously, and the probability of arc generation is reduced as the distance is increased, so that the generation of arc is prevented by the structure of the conductive fuse 20 itself, and on the other hand, the generation of flame which may be caused by instantaneous high heat is effectively prevented by the first packaging material 30.

Therefore, the utility model discloses a characteristics lie in by the structural feature of conductive fuse 20 itself, come when conductive fuse 20 fuses because of too big electric current, can prevent the production of electric arc the very first time, cooperate the characteristic of the arc extinguishing that second packaging material 30 had simultaneously, can reach the purpose that effectively prevents that stifled electric arc produces, and then reach the efficiency of maintaining circuit safety.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention in any way, and the present invention has been disclosed in the above embodiments, but not limited to the above embodiments, and any person who knows commonly in any technical field can make modifications or equivalent changes within the scope of the technical solution of the present invention.

Claims

1. A surface-mount micro fuse, comprising:

a housing having an interior space;

the first packaging material is made of flame-retardant material, is filled in the inner space of the shell and covers the fusing part of the conductive fuse and at least part of the intermediate part.

2. The surface-mount micro fuse as claimed in claim 1, wherein the fuse portion of the conductive fuse has two second sections, the second sections are respectively located at two sides of the first section, two ends of the fuse portion are connected to the end surfaces of the intermediate portion by the two second sections, and the first section located at the middle portion is separated from the intermediate portion to form the gap.

3. The surface-mount micro fuse according to claim 1 or 2, wherein the housing has a ring wall surrounding the inner space and having two opposite end walls, and the conductive portions of the conductive fuse extend out of the housing from the opening of the housing and respectively abut against the corresponding end walls.

4. The surface-mount micro fuse according to claim 3, further comprising a second encapsulant, which is a heat-resistant material and seals the opening of the housing, wherein the second encapsulant and the first encapsulant are different materials.

5. The surface mount micro fuse as recited in claim 3, wherein the intermediate portion of the conductive fuse is not parallel to the end wall of the housing such that the fuse portion is spaced apart from the opening of the housing.

6. The surface-mount micro fuse according to claim 1 or 2, wherein the first encapsulating material is quartz sand, explosion-proof sand, or a mixture of flame retardant and epoxy resin.

7. The surface-mount micro fuse as claimed in claim 6, wherein the flame retardant is melamine, magnesium hydroxide, or aluminum hydroxide.

8. The surface-mount micro fuse according to claim 4, wherein the second encapsulant is silicone or polyimide.

9. The surface-mount micro fuse as claimed in claim 1 or 2, wherein the surface of the conductive fuse is plated with a metal layer, and the melting point of the metal layer is lower than the melting point of the conductive fuse.

10. The surface-mount micro fuse as claimed in claim 1 or 2, wherein the fusing portion of the conductive fuse is made of a first material, the intermediate portion and the conductive portion of the conductive fuse are made of a second material, and the first material is different from the second material.