CN212783356U - Temperature fuse - Google Patents
Temperature fuse Download PDFInfo
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- CN212783356U CN212783356U CN202021667693.7U CN202021667693U CN212783356U CN 212783356 U CN212783356 U CN 212783356U CN 202021667693 U CN202021667693 U CN 202021667693U CN 212783356 U CN212783356 U CN 212783356U
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- end cover
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Abstract
The utility model discloses a temperature fuse, which comprises an insulating shell, two inner end covers, an fusible alloy wire, a fluxing fusing agent and two outer end covers, wherein the inner end covers and the outer end covers are made of conductive materials, and the outer end covers are leadless electrodes of the temperature fuse; the insulating shell is provided with an axial through hole; the two inner end covers are fixedly arranged at two ends of an axial through hole of the insulating shell, the fusible alloy wire is arranged in the axial through hole, and two ends of the fusible alloy wire are respectively connected with the two inner end covers in a welding way; the fusing assistant agent covers the fusible alloy wire and the welding points of the two inner end covers; the outer end cover and the inner end cover are fixedly connected and conducted in a conductive mode. The utility model discloses a temperature fuse adopts the design of leadless, can install in the fuse cassette with the form of cassette, and the installation is convenient with the change, also can weld on the PCB board through surface patch technology, reduces temperature fuse's occupation space, applies to in components and parts compact and the limited equipment in space.
Description
Technical Field
The utility model relates to a temperature protection device field especially relates to a leadless temperature fuse.
Background
The alloy type temperature fuse is an over-temperature protection component, and when the electronic equipment to be protected generates heat due to abnormal faults and the temperature reaches the fusing temperature of the temperature fuse, the fuse can be fused, so that a circuit is cut off. The alloy type thermal fuse is composed of fusible alloy, electrodes, a shell and sealing resin, and is low in fusing temperature and incapable of being subjected to wave soldering and reflow soldering. The electrode types are mainly circular lead electrodes or sheet electrodes, such as: the application numbers are: the application date of CN201920354677.3 is: 2019.03.20 discloses a temperature fuse using a lead electrode, which is a temperature fuse using a lead electrode; the application numbers are: the application date of CN200910048999.6 is: 2009.04.09 discloses a thermal fuse and a method for manufacturing the same, wherein the thermal fuse is a thermal fuse using a sheet electrode. Lead electrodes or tab electrodes are generally connected to electrical and electronic devices by spot welding or riveting, and are inconvenient to replace.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a leadless temperature fuse is applicable to the cassette formula installation to the maintenance is changed.
In order to achieve the above object, the present invention provides a temperature fuse, which comprises an insulating housing, two inner end caps, an fusible alloy wire, a fluxing fusing agent and two outer end caps, wherein the inner end caps and the outer end caps are made of conductive materials;
the insulating shell is provided with an axial through hole;
the two inner end covers are fixedly arranged at two ends of an axial through hole of the insulating shell, the fusible alloy wire is arranged in the axial through hole, and two ends of the fusible alloy wire are respectively connected with the two inner end covers in a welding mode;
the fusing assistant agent covers the fusible alloy wire and the welding points of the two inner end covers;
the outer end cover and the inner end cover are fixedly connected and conducted in a conductive mode.
Furthermore, the two inner end covers are respectively provided with a sunken area positioned in the middle and a U-shaped structure positioned on the outer side; the recessed area is embedded into the axial through hole of the shell, and the U-shaped structure is matched with the side wall of the shell.
Furthermore, the fusing assistant agent is arranged at the welding spots of the fusible alloy wires on the outer sides of the inner end covers at two ends of the insulating shell and the inner end covers, and covers the welding spots.
Further, the welding device further comprises sealing resin, wherein the sealing resin is arranged in the concave area and covers the welding spot or the fusing assistant agent.
Further, the fusing assistant agent fills the axial through hole of the insulating shell.
Furthermore, a lateral through hole communicated with the axial through hole is formed in the side wall of the insulating shell, the lateral through hole is used for filling the fusing assistant agent into the axial through hole of the fusible alloy wire, and the lateral through hole is sealed through sealing resin.
Furthermore, a through hole is formed in the center of the inner end cover, and the fusible alloy wire is connected with the inner end cover in a welding mode at the through hole of the inner end cover.
Furthermore, the inner diameter of the inner end cover and the outer diameter of the insulating shell are fixedly arranged through interference fit, and the outer diameter of the inner end cover and the inner diameter of the outer end cover are fixedly connected and conducted through interference fit.
Further, the interference fit between the inner end cover and the outer end cover is specifically as follows: the inner end cover is provided with a convex hull/open pore, and the corresponding position of the outer end cover is provided with an open pore/convex hull to form a snap fit; or the following steps: and the inner end cover is bent, so that the inner diameter of the opening of the inner end cover is smaller than the maximum inner diameter of the inner cavity of the inner end cover, and the corresponding position of the outer end cover is bent correspondingly to form matching.
Further, the cross sections of the inner end cover, the outer end cover and the insulating shell are circular or square.
Compared with the prior art, the utility model, its apparent characteristics do:
the utility model discloses a temperature fuse adopts the outer end cover as the leadless design of electrode, can install in the fuse cassette with the form of cassette, and the installation is convenient with the change, and the temperature fuse of having avoided partial specification has expanded the application scene of temperature fuse at the impaired phenomenon with the disconnection of fuse that wave-soldering or reflow soldering in-process arouse. When the fuse is disconnected due to abnormal heating inside the electronic equipment, the electronic equipment can work normally again after the internal circuit of the equipment is checked and repaired and the temperature fuse in the seat is replaced again. Meanwhile, the temperature fuse can be welded on the PCB through a surface mounting process, so that the occupied space of the temperature fuse is reduced, and the temperature fuse is applied to equipment with compact components and limited space.
Drawings
Fig. 1 is an exploded view of embodiment 1 of the present invention;
fig. 2 is a sectional view of embodiment 1 of the present invention;
fig. 3 is an exploded view of embodiment 2 of the present invention;
fig. 4 is a sectional view of embodiment 2 of the present invention;
fig. 5 is an exploded view of embodiment 3 of the present invention;
fig. 6 is a sectional view of embodiment 3 of the present invention;
FIG. 7 is a schematic view of the installation of the thermal fuse holder of the present invention;
fig. 8a, 8b and 8c are schematic diagrams of interference fit structures of the inner end cover and the outer end cover.
Wherein: 1a, 1 b-inner end cap; 2-a housing; 3-fusible alloy wire; 4a, 4b, 4 c-fluxing agent; 5a, 5 b-outer end caps; 6a, 6b, 6 c-sealing resin; 11a, 51 b-convex hull; 11b, 51 a-openings; 11c, 51 c-bending treatment; 21-axial through hole; 22-lateral through hole.
Detailed Description
To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The present invention will now be further described with reference to the accompanying drawings and detailed description.
Example one
In this embodiment, fig. 1 and fig. 2 are an exploded view and a cross-sectional view of a first embodiment of the present invention, respectively.
The utility model discloses in, the temperature fuse includes insulating shell 2, two interior end caps 1a, 1b, fusible alloy silk 3, helps fusing agent 4a, 4b and two outer end caps 5a, 5b, and interior end cap 1a, 1b and outer end cap 5a, 5b are electrically conductive material, and outer end cap 5a, 5b do the leadless electrode of temperature fuse.
In this embodiment, the inner end caps 1a and 1b are circular, the centers of the inner end caps 1a and 1b are recessed inward to form a recessed region in the center and a U-shaped structure on the outer side (formed by the recessed region and the outer edge of the inner end cap), the end surfaces of the inner end caps may also be square or other shapes, the housing 2 is provided with an axial through hole 21, the two inner end caps 1a and 1b are respectively installed at two ends of the axial through hole 21 of the insulating circular housing 2, and the recessed direction of the recessed region faces the housing 2. The housing 2 may also be square or in other shapes, and the side wall of the housing 2 and the U-shaped structure of the inner end caps 1a and 1b cooperate to form a stable snap-fit structure. The fusible alloy wire 3 is arranged in an axial through hole 21 of the shell 2, passes through the openings of the two inner end covers 1a and 1b and is welded; the fusible alloy wire 3 and the welding spots of the two inner end covers 1a and 1b are covered with fusing assistant agents 4a and 4 b; the outer end cover 5a is sleeved on the inner end cover 1a, the outer end cover 5b is sleeved on the inner end cover 1b, the shapes of the outer end covers 5a and 5b are consistent with those of the inner end covers 1a and 1b and the shell 2, and the outer end covers can be circular, square or other shapes; the outer end caps 5a and 5b and the inner end caps 1a and 1b are in interference fit to form leadless electrodes of the thermal fuse, and the outer end caps 5a and 5b can also play a role in sealing the two port parts of the housing 2.
Example two
In this embodiment, fig. 3 and 4 are an exploded view and a cross-sectional view of the second embodiment, respectively.
In this example, unlike example 1, there are: the two inner end caps 1a, 1b are formed by bending a metal sheet to form a recessed area in the middle and a U-shaped structure on the outer side, the two inner end caps 1a, 1b are mounted at two ends of an axial through hole 21 of the square housing 2, and the recessed direction of the recessed area faces the housing 2. The housing 2 may have other shapes, and the side wall of the housing 2 and the U-shaped structure of the inner end caps 1a and 1b cooperate to form a stable snap-fit structure. The fusible alloy wire 3 passes through the holes of the two inner end covers 1a and 1b and is welded; the fusible alloy wire 3 and welding points of the two inner end covers 1a and 1b are covered with fusing assistant agents 4a and 4b, sealing resins 6a and 6b are covered on the fusing assistant agents 4a and 4b to play a role in sealing, the inner end covers 1a and 1b are respectively sleeved with the square outer end covers 5a and 5b, the outer end covers 5a and 5b form leadless electrodes of the temperature fuse, and the function of sealing two ends of the axial through hole 21 of the shell can also be played.
EXAMPLE III
In this embodiment, fig. 5 and 6 are a perspective exploded view and a cross-sectional view of the third embodiment, respectively.
In this embodiment, the two inner end caps 1a and 1b are formed by bending a metal sheet to form a recessed area in the middle and U-shaped structures at both ends, the two inner end caps 1a and 1b are mounted at both ends of the axial through hole 21 of the square housing 2, the housing 2 may have other shapes, and the side wall of the housing and the U-shaped structures of the inner end caps 1a and 1b cooperate to form a stable snap mounting structure. The fusible alloy wire 3 is passed through the openings of the two inner end caps 1a, 1b and welded. Sealing resins 6a and 6b are placed on the welding points of the fusible alloy wire 3 and the inner end caps 1a and 1b to perform a sealing function, but the sealing resins may not be placed. The square outer end covers 5a and 5b respectively sleeve the inner end covers 1a and 1b, the inner diameters of the outer end covers 5a and 5b and the outer diameters of the inner end covers 1a and 1b are in interference fit to form a leadless electrode of a temperature fuse, and the outer end covers 5a and 5b can also play a role in sealing the openings at two ends of the shell. The lateral through hole 22 is arranged on the side wall of the shell 2, the lateral through hole 22 can be in a circular shape, a square shape or other shapes, the number of the holes can be one or more, the lateral through hole 22 on the side wall of the shell 2 is communicated with the axial through hole 21 of the shell 2 and used for injecting the fluxing medium 4c into a gap between the fusible alloy wire 3 and the axial hole of the shell, and the fusible alloy wire 3 is wrapped or partially wrapped by the fluxing medium 4 c. The lateral through-hole 22 of the housing 2 is sealed by the sealing resin 6 c.
The function of the fuse aids 4a, 4b, 4c is to help the melted alloy to shrink onto the two inner end caps 1a, 1 b. When the temperature of the thermal fuse reaches its fusing temperature, the internal fusible alloy wire 3 fuses and contracts on the two metal inner end caps 1a, 1b, thereby cutting off the circuit.
The outer end caps 5a and 5b seal openings at two ends of the housing 2, and the outer end caps 5a and 5b and the inner end caps 1a and 1b are in interference fit to play roles in sealing and connecting.
To achieve the sealing, fixing connection and conductive conduction of the outer end caps 5a, 5b and the inner end caps 1a, 1b, as shown in fig. 8a, 8b and 8c, three preferred structural forms of interference fit between the inner end cap 1a and the outer end cap 5a are given:
in fig. 8a, the inner end cap 1a is provided with a convex hull 11a and the corresponding position of the outer end cap 5a is provided with an aperture 51a forming a snap fit.
In fig. 8b, the inner end cap 1a is provided with an aperture 11b and the corresponding position of the outer end cap 5a is provided with a convex hull 51b, forming a snap fit.
In fig. 8c, the inner end cap 1a is bent by a small angle 11c so that the inner diameter of the opening of the inner end cap is smaller than the maximum inner diameter of the inner cavity thereof, and the corresponding position of the outer end cap 5a is bent by the same small angle 51c to form a fit.
In the present embodiment, the housing 2 is a ceramic shell (e.g., sintered by using 95% alumina powder), and has insulating, high temperature resistant and anti-explosion properties.
As shown in fig. 7, the thermal fuse 100 can be installed on a fuse holder, the fuse holder includes a base 200 and two metal brackets 300a, 300b, the thermal fuse 100 is clamped on the fuse holder, and the outer end caps 5a, 5b of the thermal fuse 100 respectively abut against the two metal brackets 300a, 300b to form an electrical connection.
The thermal fuse 100 may be soldered to a pad of a PCB by spot welding, like a chip fuse.
The utility model discloses following technological effect has:
1. the temperature fuse is arranged in the fuse clamping seat in a clamping seat mode, the installation and the replacement are convenient, the phenomena of fuse damage and disconnection caused by the temperature fuse with partial specification in the wave soldering or reflow soldering process are avoided, and the application scene of the temperature fuse is expanded. When the fuse is disconnected due to abnormal heating inside the electronic equipment, the electronic equipment can work normally again after the internal circuit of the equipment is checked and repaired and the temperature fuse in the seat is replaced again.
2. The temperature fuse is welded on the PCB through a surface mounting process, so that the occupied space of the temperature fuse is reduced, and the temperature fuse is applied to equipment with compact components and limited space.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A thermal fuse, characterized by: the fuse comprises an insulating shell, two inner end covers, fusible alloy wires, fluxing agent and two outer end covers, wherein the inner end covers and the outer end covers are made of conductive materials, and the outer end covers are electrodes of the temperature fuse;
the insulating shell is provided with an axial through hole;
the two inner end covers are fixedly arranged at two ends of an axial through hole of the insulating shell, the fusible alloy wire is arranged in the axial through hole, and two ends of the fusible alloy wire are respectively connected with the two inner end covers in a welding mode;
the fusing assistant agent covers the fusible alloy wire and the welding points of the two inner end covers;
the outer end cover and the inner end cover are fixedly connected and conducted in a conductive mode.
2. The thermal fuse of claim 1, wherein: the two inner end covers are respectively provided with a sunken area positioned in the middle and a U-shaped structure positioned on the outer side; the recessed area is embedded into the axial through hole of the shell, and the U-shaped structure is matched with the side wall of the shell.
3. The thermal fuse of claim 2, wherein: the fusing assistant agent is arranged at the welding spots of the fusible alloy wires on the outer sides of the inner end covers at two ends of the insulating shell and the inner end covers, and covers the welding spots.
4. The thermal fuse according to claim 3, wherein: the sealing resin is arranged in the sunken area and covers the welding spot or the fusing assistant agent.
5. The thermal fuse of claim 2, wherein: and the fusing assistant agent is filled in the axial through hole of the insulating shell.
6. The thermal fuse according to claim 5, wherein: and a lateral through hole communicated with the axial through hole is formed in the side wall of the insulating shell, the lateral through hole is used for filling the fusing assistant agent into the axial through hole of the fusible alloy wire, and the lateral through hole is sealed by sealing resin.
7. The thermal fuse of claim 1, wherein: the center of the inner end cover is provided with a through hole, and the fusible alloy wire is connected with the inner end cover in a welding mode at the through hole of the inner end cover.
8. The thermal fuse of claim 1, wherein: the inner diameter of the inner end cover and the outer diameter of the insulating shell are fixedly arranged through interference fit, and the outer diameter of the inner end cover and the inner diameter of the outer end cover are fixedly connected and conducted through interference fit.
9. The thermal fuse of claim 8, wherein: the interference fit of the inner end cover and the outer end cover is as follows: the inner end cover is provided with a convex hull/open pore, and the corresponding position of the outer end cover is provided with an open pore/convex hull to form a snap fit; or the following steps: and the inner end cover is bent, so that the inner diameter of the opening of the inner end cover is smaller than the maximum inner diameter of the inner cavity of the inner end cover, and the corresponding position of the outer end cover is bent correspondingly to form matching.
10. The thermal fuse of claim 1, wherein: the sections of the inner end cover, the outer end cover and the insulating shell are circular or square.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021667693.7U CN212783356U (en) | 2020-08-12 | 2020-08-12 | Temperature fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021667693.7U CN212783356U (en) | 2020-08-12 | 2020-08-12 | Temperature fuse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212783356U true CN212783356U (en) | 2021-03-23 |
Family
ID=75051962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021667693.7U Active CN212783356U (en) | 2020-08-12 | 2020-08-12 | Temperature fuse |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212783356U (en) |
-
2020
- 2020-08-12 CN CN202021667693.7U patent/CN212783356U/en active Active
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