CN112768323A - Expansion type fuse and manufacturing method thereof - Google Patents
Expansion type fuse and manufacturing method thereof Download PDFInfo
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- CN112768323A CN112768323A CN202011578673.7A CN202011578673A CN112768323A CN 112768323 A CN112768323 A CN 112768323A CN 202011578673 A CN202011578673 A CN 202011578673A CN 112768323 A CN112768323 A CN 112768323A
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- cavity
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/05—Component parts thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H69/00—Apparatus or processes for the manufacture of emergency protective devices
- H01H69/02—Manufacture of fuses
Abstract
The present invention discloses an expansion type fuse, including: the fuse comprises a fuse body and a filler, wherein the insulating shell is internally provided with an accommodating cavity, at least one part of the outer electrode is positioned outside the insulating shell, the fuse body is electrically connected with the outer electrode, the fuse body comprises a fuse part, the fuse part is positioned in the accommodating cavity, the filler is filled in the accommodating cavity, and the filler comprises an expansion type filler and a gas generation type filler; the invention also discloses a manufacturing method of the expansion type fuse; the expansion type fuse has good sealing performance, can effectively solve the problem of infiltration of the pouring sealant, and simultaneously ensures the yield of the expansion type fuse.
Description
Technical Field
The invention relates to the field of electrical protection elements, in particular to an expansion type fuse and a manufacturing method thereof.
Background
The fuse is widely applied to overcurrent protection of various electronic components. The metal conductor is used as a melt to be connected in series in the circuit, when the circuit is abnormal, the melt of the fuse can be automatically melted after the current exceeds a specified value, and the effects of disconnecting the circuit and protecting an electric appliance are achieved.
In the electronic industry, electronic components are often required to be encapsulated and isolated from the outside, so that the shock resistance, the severe environment resistance, the dust prevention, the moisture prevention and the corrosion prevention of the electronic components are improved, the electrical insulation and the heat dissipation performance are improved, and the high-voltage components can be assembled in a short distance. However, the potting compound may generate bubbles during filling, which results in voids after curing. In order to avoid the problem, a vacuum encapsulation process is mostly adopted in the prior art, which puts requirements on the tightness of the components.
The patch hollow fuse in the prior art is generally not sealed due to small volume, such as a ceramic tube, a glass tube and other fuses, a copper cap is directly sleeved on the tube, and the sealing property is not available; the size of the patch fuse is smaller, particularly 2410 and 1206 are selected in the embodiment, and the size of the hole wall is 0.1-0.2 mm; therefore, the E2 cannot be closed 100% only by the glue layer E1, and pores are inevitably generated. Under vacuum encapsulation, the encapsulation adhesive permeates into an inner cavity to cause the reduction of the breaking capacity and the resistance of a fuse after breaking, and the safety of a product is influenced. Vacuum is also achieved in the prior art by means of an envelope or glass-to-metal encapsulation, but the above method is costly.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an expansion type fuse and a manufacturing method thereof, which can effectively solve the problem of infiltration of pouring sealant.
In one aspect, the present invention provides an expansion type fuse including:
the insulation shell is internally provided with an accommodating cavity;
an outer electrode, at least a portion of the outer electrode being located outside the insulating housing;
the fuse link is electrically connected with the outer electrode and comprises a fusing part, and the fusing part is positioned in the accommodating cavity;
the filler is filled in the accommodating cavity, the filler comprises an expansion type filler and a gas generation type filler, the expansion type filler expands after being filled, and the gas generation type filler is heated and decomposed to form gas when the fusing part is fused.
Further, the intumescent filler is selected from one or more of gypsum or calcium oxide.
Further: the gas-generating type filler is selected from one or more of metal hydrate/melamine salt/hydrous silicate mineral/hydrous aluminosilicate mineral.
Further, the mass percentage of the expanded filler in the filler is 50-90%.
Further, the mass percentage of the gas generation type filler in the filler is 0-20%.
Furthermore, the insulating housing comprises a first cavity and a second cavity, the first cavity and the second cavity are fixedly connected through a glue layer to form the accommodating cavity in a surrounding mode, and the filler is filled in gaps of the glue layer.
In another aspect, the present invention provides an expansion type fuse characterized by comprising:
the insulation shell is internally provided with an accommodating cavity;
an outer electrode, at least a portion of the outer electrode being located outside the insulating housing;
the fuse link is electrically connected with the outer electrode and comprises a fusing part, and the fusing part is positioned in the accommodating cavity;
the filler is filled in the accommodating cavity and consists of an expansion type filler and a gas generation type filler, the expansion type filler expands after being filled, and the gas generation type filler is heated and decomposed to form gas when the fusing part is fused.
Further, the intumescent filler is selected from one or more of gypsum or calcium oxide.
Further, the mass percentage of the gas generating type filler in the filler is less than or equal to 20%, and the mass percentage of the expansion type filler in the filler is greater than or equal to 80%.
The present invention also provides an expansion fuse, comprising:
the insulating shell comprises a first cavity, a second cavity and a cover plate which are sequentially overlapped from top to bottom, cavities are formed in the first cavity and the second cavity, the first cavity and the second cavity are fixedly connected through a glue layer to form an accommodating cavity in a surrounding mode, and the cover plate is fixedly connected with the lower surface of the second cavity through the glue layer; the insulating shell is provided with a blind hole, the side wall of the blind hole is positioned on the first cavity, and the bottom wall of the blind hole is positioned on the second cavity;
the outer electrode comprises an upper surface electrode arranged on the upper surface of the first cavity, a lower surface electrode positioned on the lower surface of the cover plate, a side electrode positioned on the side wall of the insulating shell and electrically connected with the upper surface electrode and the lower surface electrode at corresponding positions, and a blind hole electrode positioned on the side wall and the bottom wall of the blind hole, wherein the blind hole electrode is electrically connected with the upper surface electrode, the lower surface electrode and the side electrode at corresponding positions;
the fuse link is electrically connected with the blind hole electrode and comprises a fusing part, the fusing part is positioned in the accommodating cavity, and the fuse link is attached to the bottom wall of the blind hole;
the filler is filled in the accommodating cavity, the filler comprises an expansion type filler and a gas generation type filler, the expansion type filler expands after being filled, and the gas generation type filler is heated and decomposed to form gas when the fusing part is fused;
in another aspect, the present invention provides a method of manufacturing an expansion type fuse, including the steps of:
processing the surface of the insulating base material to form a surface electrode, and forming the cover plate and the first cavity body;
forming cavities on the first cavity substrate and the insulating substrate to form the first cavity and the second cavity;
manufacturing a fuse link, arranging the fuse link on the bottom wall of the first cavity, and fixedly connecting the first cavity and the second cavity through a glue layer to form an accommodating cavity;
uniformly and mechanically mixing the filler containing the expansion type filler and the gas generation type filler, and filling the mixture into the accommodating cavity;
fixedly connecting the cover plate with the bottom wall of the second cavity through a glue layer;
the blind hole is formed in the upper surface of the first cavity;
electroplating to form the blind hole electrode and the side electrode;
cutting to form individual expansion type fuses.
In another aspect, the present invention also provides a method of manufacturing an expansion type fuse, including:
the insulating shell comprises a first cavity, a second cavity and a cover plate which are sequentially overlapped from top to bottom, cavities are formed in the first cavity and the second cavity, the first cavity and the second cavity are fixedly connected through a glue layer to form an accommodating cavity in a surrounding mode, and the cover plate is fixedly connected with the lower surface of the second cavity through the glue layer; the insulating shell is provided with a blind hole, the side wall of the blind hole is positioned on the first cavity, and the bottom wall of the blind hole is positioned on the second cavity;
the outer electrode comprises an upper surface electrode arranged on the upper surface of the first cavity, a lower surface electrode positioned on the lower surface of the cover plate, a side electrode positioned on the side wall of the insulating shell and electrically connected with the upper surface electrode and the lower surface electrode at corresponding positions, and a blind hole electrode positioned on the side wall and the bottom wall of the blind hole, wherein the blind hole electrode is electrically connected with the upper surface electrode, the lower surface electrode and the side electrode at corresponding positions;
the fuse link is electrically connected with the blind hole electrode and comprises a fusing part, the fusing part is positioned in the accommodating cavity, and the fuse link is attached to the bottom wall of the blind hole;
the filler is filled in the accommodating cavity, the filler comprises an expansion type filler and a gas generation type filler, the expansion type filler expands after being filled, and the gas generation type filler is heated and decomposed to form gas when the fusing part is fused;
the manufacturing method comprises the following steps:
processing the surface of the insulating base material to form a surface electrode, and forming the cover plate and the first cavity body;
forming cavities on the first cavity substrate and the insulating substrate to form the first cavity and the second cavity;
manufacturing a fuse link, arranging the fuse link on the top wall of the second cavity, and fixedly connecting the first cavity and the second cavity through a glue layer to form an accommodating cavity;
firstly filling the filling material which does not contain the gas generation type filling material and contains the expansion type filling material into the accommodating cavity, then filling the filling material which contains the gas generation type filling material to the position near the fuse link, and then filling the filling material which does not contain the gas generation type filling material and contains the expansion type filling material into the residual space of the accommodating cavity;
fixedly connecting the cover plate with the bottom wall of the second cavity through a glue layer;
the blind hole is formed in the upper surface of the first cavity;
electroplating to form the blind hole electrode and the side electrode;
cutting to form individual expansion type fuses.
The invention has the following beneficial effects:
compared with the prior art, the expansion type fuse provided by the invention has the following technical effects:
this technical scheme design, through filling expanded filler and inflatable filler in the inner chamber at the fuse, utilize expanded filler contact air promptly expansible characteristic to prevent the holding chamber in the pouring sealant infiltration fuse among the fuse assembling process, improved the leakproofness of fuse, still added inflatable filler simultaneously for the higher resistance after still can be guaranteed to cut off when the leakproofness is guaranteed to the fuse, improved the yields of fuse, make the fuse have very high security.
The invention will be further described with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a schematic perspective sectional view of an expansion type fuse according to a first embodiment of the present invention;
fig. 2 is a schematic sectional view of an expansion type fuse provided in a second embodiment of the present invention;
FIG. 3 is a photograph of potting a fuse;
FIG. 4 is an X-RAY diagram of a prior art encapsulated fuse;
fig. 5 is an X-RAY diagram of the expansion fuse provided by the present invention after encapsulation.
Reference numerals:
11-a first cavity; 12-a second cavity; 13-a cover plate; 21-upper surface electrode; 22-lower surface electrode; 23-side electrode; 24-a blind hole electrode; 31-a fusing part; 41-intumescent filler; 42-gas generating type filler; 43-small molecule; 5-an accommodating cavity; 6-blind hole.
Detailed Description
The present invention will be further understood from the specific examples given below, which are not intended to limit the present invention.
Example one
The embodiment provides an expansion type fuse, which includes an insulating housing with an accommodating cavity 5 inside, an external electrode at least a part of which is located outside the insulating housing, a fuse link 3 electrically connected with the external electrode, and a filler 4 filled in the accommodating cavity 5, wherein the fuse link 3 includes a fusing part 31 located in the accommodating cavity. The filler 4 includes an expansion type filler 41 whose volume expands after filling and a gas generation type filler 42 which is decomposed to generate gas when the fusing part 31 is fused.
As shown in fig. 1, in the expansion type fuse in this embodiment, the insulating housing includes a first cavity 11, a second cavity 12, and a cover plate 13 that are sequentially stacked from top to bottom, wherein cavities are both formed inside the first cavity 11 and inside the second cavity 12, specifically, the cavity inside the first cavity 11 is a blind cavity (having a bottom wall, a side wall, and an opening), the cavity inside the second cavity 12 is a through cavity (having only a side wall without a bottom wall and having two opposite openings), the opening of the blind cavity is opposite to the opening of the through cavity, and the first cavity 11 and the second cavity 12 are fixedly connected by a glue layer 7 to form an accommodating cavity 5 (formed after the blind cavity is communicated with the through cavity). The cover plate 13 and the second cavity 12 may be integrally formed or may be fixedly connected. In this embodiment, the cover plate 13 is fixedly connected to the lower surface of the second cavity 12 through the glue layer 7, that is, the cover plate 13 closes another opening of the through cavity to form the complete closed accommodating cavity 5. The insulating housing further has a blind hole 6, in this embodiment, a side wall of the blind hole 6 is located on the first cavity 11, and a bottom wall of the blind hole 6 is located on a top wall of the second cavity 12.
The external electrode in this embodiment includes an upper surface electrode 21 disposed on the upper surface of the first cavity 11, a lower surface electrode 22 disposed on the lower surface of the cover plate 3, a side electrode 23 located on the side wall of the insulating housing and electrically connected to the upper surface electrode 21 and the lower surface electrode 22 at corresponding positions, and a blind hole electrode 24 located on the side wall and the bottom wall of the blind hole 6, wherein the blind hole electrode 24 is electrically connected to the side electrode 23 of the upper surface electrode 21 and the lower surface electrode 22 at corresponding positions. In this embodiment, the sidewalls of the two sides of the first cavity 11 and the second cavity 12 in the length direction are completely coated with a conductive material to form the side electrodes 23, and the upper surface electrode 21 and the lower surface electrode 22 are respectively disposed on the upper surface of the first cavity 11 and the two ends of the upper surface of the second cavity 12 in the length direction.
The fuse element 3 may be provided in any conventional manner, for example, in a sheet-like, plate-like, spiral shape, or the like. The fuse link 3 in this embodiment is a linear fuse link, and both ends of the fuse link 3 are respectively attached to the bottom wall of the blind hole 6, and are further electrically connected to the blind hole electrode 24.
The intumescent filler 41 of filler 4 may be selected from one or a mixture of gypsum or calcium oxide. After the filling material is filled into the accommodating cavity, the expansion type filling material in the filling material can adsorb H in the atmosphere2O，CO2The small molecules 43 expand the volume of the filling material, fill gaps generated in production, prevent the pouring sealant from permeating into the accommodating cavity, and enable the filling material to meet the requirements of vacuum pouring and sealing, and particularly, when gaps occur in the pouring sealant layer (the pouring sealant layer is difficult to have no gaps completely), the gaps can be quickly filled with the expansion type filling material.
As shown in the comparative example in table 1, when the filler 4 only includes the intumescent filler 41, the filler is agglomerated after expansion, the filling effect in the accommodating cavity 5 is dense, and in some cases, after the fuse link 3 is fused, the space at the corresponding position of the fusing part 31 is too small, and metal vapor cannot diffuse in time, so that the resistance of the fuse link 3 after being broken is relatively low, and some of the metal vapor is only 0.01M Ω, which is lower than the requirement of 0.1M Ω of UL safety standard.
Therefore, the filler 4 also comprises the gas generation type filler 42, the gas generation type filler 42 is decomposed by utilizing high temperature generated when the fuse link 3 is fused, the generated gas washes away the agglomerated filler 4, at least a larger gas chamber or space is formed at the fused part of the fusing part 31, and metal vapor generated after the fuse link 3 is fused is taken away or dispersed in a larger area, so that the resistance of the expanded fuse after the fuse is broken is improved, the stability of the internal tightness and the resistance value of the fuse during normal use is ensured, the fuse effectively breaks the circuit after the fuse is fused, and the condition that the circuit is still closed and further dangerous due to the fact that the fuse link 3 is fused because of overhigh voltage or current is avoided. The gas generating filler 42 may be selected from materials that can be decomposed to generate gas after being heated in the prior art, and in this embodiment, it is selected from one or a mixture of several of metal hydrate/melamine salt/hydrous silicate mineral/hydrous aluminosilicate mineral. The metal hydrate can be magnesium hydroxide, aluminum hydroxide and the like, and can also be a mixture of a plurality of metal hydrates according to a certain proportion; the specific proportion of each component of the mixture can be obtained by experiments to adapt to different actual requirements (such as the model of an expansion type fuse, the use environment and the like), for example, a material with high gas production rate and high gas production speed when being heated is selected.
Table 1 comparative example and example a resistance analysis table after fuse-link (fuse-link performance is unstable and defective rate is high when only expanding filler is filled, and yield of fuse-link is greatly improved when gas generating filler is added.)
The filler 4 may include other materials such as quartz sand, resin, etc. in addition to the intumescent filler 41 and the gas generating filler 42, so as to control the degree of expansion of the fuse. A suitable proportion of the composition of the filler 4 is: the mass percentage of the expansion type filler 41 in the filler 4 is 50-90%, the mass percentage of the gas generation type filler 42 in the filler 4 is 0-20%, and the rest is quartz sand. In the present embodiment, the mass percentage of the gas generation type filler 42 is 10%, and as shown in table 1, the resistance of the expansion type fuse of the present embodiment reaches 2.00M Ω after the fuse link 3 is fused.
The manufacturing method of the expansion type fuse in the present embodiment includes the steps of:
processing (such as electroplating) the surface of the insulating substrate to form a surface electrode 21, and manufacturing a cover plate 13 and a first cavity body;
processing a blind cavity formed on the first cavity substrate in a milling mechanical mode to form a first cavity 11, and forming a through cavity on an insulating substrate to form a second cavity 12;
manufacturing a fuse to form a fuse link 3, arranging the fuse link 3 on the top wall of the second cavity 12, fixedly connecting the first cavity 11 and the second cavity 12 through a glue layer 4 to form an accommodating cavity 5, and positioning a fusing part 51 of the fuse in the accommodating cavity 5;
uniformly and mechanically mixing the filler 4 containing the expansion type filler 41 and the gas generation type filler 42, and filling the mixture into the accommodating cavity 5;
fixedly connecting the cover plate 13 with the bottom wall of the second cavity 12 through the glue layer 7;
a blind hole 6 is formed in the upper surface of the first cavity 12;
respectively forming a blind hole electrode 24 and a side electrode 23 on the surfaces of the bottom wall and the side wall of the blind hole 6 and the surfaces of the two side walls of the first cavity 11 and the second cavity 12 in the length direction in an electroplating way;
cut to make individual expansion fuses.
In order to verify the sealing effect of the expansion fuse of the present invention, as shown in fig. 3, a potting test was performed on the expansion fuse provided in this embodiment and the fuse in the prior art in which the filler only contains quartz sand. As shown in fig. 4, in the fuse in the prior art, due to poor sealing performance, after vacuum potting, black potting adhesive permeates into the accommodating cavity 5. As shown in fig. 5, after vacuum potting, no black potting compound permeates into the accommodating cavity 5 in the expansion fuse of the present invention.
Example two
As shown in fig. 2, the difference between the first embodiment and the second embodiment is that the cover plate 13, the first cavity 11 and the second cavity 12 are sequentially disposed from top to bottom, and all the components are fixedly connected by the adhesive layer 7, which is not additionally labeled in the drawing. The cavity in the first cavity 11 is a through cavity, and the cavity in the second cavity 12 is a blind cavity. The cover plate 13 and the first cavity 11 may be integrally formed, and the cavity in the first cavity 11 is also a blind cavity. The cover plate 13 in this embodiment is fixedly connected to the first cavity 11.
In addition, the filler 4 in this embodiment is composed of an expansion type filler 41 and a gas generation type filler 42, the mass percentage of the gas generation type filler 42 in the filler 4 is less than or equal to 20%, and the mass percentage of the expansion type filler 41 in the filler 4 is greater than or equal to 80%, and the filler can achieve better sealing performance and prevent the permeation of the potting adhesive in this proportion.
EXAMPLE III
This example differs from example one in that the filler 4 is not a completely homogeneous mechanically mixed product, but is a layered structure. In this embodiment, the gas generating type filler 42 is filled only in the accommodating cavity 5 adjacent to the fusing part 31, and the expansion type filler 41 and other fillers are filled in other positions of the accommodating cavity 5. The embodiment can maximize the function of the gas generation type filler 42, thereby improving the effective use efficiency of the expansion type filler 41, reducing the total use amount of the expansion type filler 41 and reducing the filler cost.
The method for manufacturing the expansion fuse of the present embodiment adopts a stepwise filling (for example, a layered filling) manner when filling the accommodating cavity 5 with the filler 4: filling part of the expansion type filler and/or other quartz sand fillers, filling the gas generation type filler 42 near the fusing part 31, and finally filling the rest part of the accommodating cavity 5 with the expansion type filler and/or other quartz sand fillers. Of course, the mixed filler with the higher gas generating type filler 42 ratio filled near the fusing part 31 also belongs to a specific embodiment of the inventive concept of the present invention, and also belongs toWithin the scope of the invention. If the glue layer 7 near the fuse link 3 is porous, the filler absorbs H in the air2O，CO2And the like, to cause the expansion and block the gaps in the glue layer 7, thereby ensuring the sealing property.
Specifically, the manufacturing method includes the steps of:
processing (such as electroplating) the surface of the insulating substrate to form a surface electrode 21, and manufacturing a cover plate 13 and a first cavity body;
processing a blind cavity formed on the first cavity substrate in a milling mechanical mode to form a first cavity 11, and forming a through cavity on an insulating substrate to form a second cavity 12;
manufacturing a fuse to form a fuse link 3, arranging the fuse link 3 on the top wall of the second cavity 12, fixedly connecting the first cavity 11 and the second cavity 12 through a glue layer 4 to form an accommodating cavity 5, and positioning a fusing part 51 of the fuse in the accommodating cavity 5;
firstly, filling the filling material 4 which does not contain the gas generation type filling material 42 and contains the expansion type filling material 41 into the accommodating cavity 5, then filling the filling material 4 which contains the gas generation type filling material 42 to the vicinity of the fuse link 3, and then filling the filling material 4 which does not contain the gas generation type filling material 42 and contains the expansion type filling material 41 into the residual space of the accommodating cavity 3;
fixedly connecting the cover plate 13 with the bottom wall of the second cavity 12 through the glue layer 7;
a blind hole 6 is formed in the upper surface of the first cavity 12;
respectively forming a blind hole electrode 24 and a side electrode 23 on the surfaces of the bottom wall and the side wall of the blind hole 6 and the surfaces of the two side walls of the first cavity 11 and the second cavity 12 in the length direction in an electroplating way;
cut to make individual expansion fuses.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention.
Claims (10)
1. An expansion type fuse, characterized by comprising:
the insulation shell is internally provided with an accommodating cavity;
an outer electrode, at least a portion of the outer electrode being located outside the insulating housing;
the fuse link is electrically connected with the outer electrode and comprises a fusing part, and the fusing part is positioned in the accommodating cavity;
the filler is filled in the accommodating cavity, the filler comprises an expansion type filler and a gas generation type filler, the expansion type filler expands after being filled, and the gas generation type filler is heated and decomposed to form gas when the fusing part is fused.
2. An intumescent fuse as claimed in claim 1, characterized in that: the intumescent filler is selected from one or more of gypsum or calcium oxide.
3. An intumescent fuse as claimed in claim 1, characterized in that: the gas-generating type filler is selected from one or more of metal hydrate, melamine salt, hydrous silicate mineral or hydrous aluminosilicate mineral.
4. An intumescent fuse as claimed in claim 1, characterized in that: the mass percentage of the expansion type filler in the filler is 50-90%.
5. An intumescent fuse as claimed in claim 1, characterized in that: the mass percentage of the gas production type filler in the filler is 0-20%.
6. An intumescent fuse as claimed in claim 1, characterized in that: the insulation shell comprises a first cavity and a second cavity, the first cavity and the second cavity are fixedly connected through a glue layer to form the accommodating cavity in a surrounding mode, and the filler is filled in gaps of the glue layer.
7. An expansion type fuse, characterized by comprising:
the insulation shell is internally provided with an accommodating cavity;
an outer electrode, at least a portion of the outer electrode being located outside the insulating housing;
the fuse link is electrically connected with the outer electrode and comprises a fusing part, and the fusing part is positioned in the accommodating cavity;
the filler is filled in the accommodating cavity,
the filler is composed of an expansion type filler and a gas generation type filler, the expansion type filler expands in volume after being filled, and the gas generation type filler is heated and decomposed to form gas when the fusing part is fused.
8. An intumescent fuse as claimed in claim 7, characterized in that: the mass percentage of the gas generation type filler in the filler is less than or equal to 20 percent, and the mass percentage of the expansion type filler in the filler is more than or equal to 80 percent.
9. An expansion type fuse, characterized in that,
the expansion type fuse includes:
the insulating shell comprises a first cavity, a second cavity and a cover plate which are sequentially overlapped from top to bottom, cavities are formed in the first cavity and the second cavity, the first cavity and the second cavity are fixedly connected through a glue layer to form an accommodating cavity in a surrounding mode, and the cover plate is fixedly connected with the lower surface of the second cavity through the glue layer; the insulating shell is provided with a blind hole, the side wall of the blind hole is positioned on the first cavity, and the bottom wall of the blind hole is positioned on the second cavity;
the outer electrode comprises an upper surface electrode arranged on the upper surface of the first cavity, a lower surface electrode positioned on the lower surface of the cover plate, a side electrode positioned on the side wall of the insulating shell and electrically connected with the upper surface electrode and the lower surface electrode at corresponding positions, and a blind hole electrode positioned on the side wall and the bottom wall of the blind hole, wherein the blind hole electrode is electrically connected with the upper surface electrode, the lower surface electrode and the side electrode at corresponding positions;
the fuse link is electrically connected with the blind hole electrode and comprises a fusing part, the fusing part is positioned in the accommodating cavity, and the fuse link is attached to the bottom wall of the blind hole;
the filler is filled in the accommodating cavity, the filler comprises an expansion type filler and a gas generation type filler, the expansion type filler expands after being filled, and the gas generation type filler is heated and decomposed to form gas when the fusing part is fused.
10. A method of manufacturing an intumescent fuse as claimed in claim 9, characterized in that said method of manufacturing comprises the steps of:
processing the surface of the insulating base material to form a surface electrode, and forming the cover plate and the first cavity body;
forming cavities on the first cavity substrate and the insulating substrate to form the first cavity and the second cavity;
manufacturing a fuse link, arranging the fuse link on the top wall of the second cavity, and fixedly connecting the first cavity and the second cavity through a glue layer to form an accommodating cavity;
uniformly and mechanically mixing the filler containing the expansion type filler and the gas generation type filler, and filling the mixture into the accommodating cavity;
fixedly connecting the cover plate with the bottom wall of the second cavity through a glue layer;
the blind hole is formed in the upper surface of the first cavity;
electroplating to form the blind hole electrode and the side electrode;
cutting to form individual expansion type fuses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011578673.7A CN112768323B (en) | 2020-12-28 | 2020-12-28 | Expansion type fuse and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011578673.7A CN112768323B (en) | 2020-12-28 | 2020-12-28 | Expansion type fuse and manufacturing method thereof |
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| CN112768323A true CN112768323A (en) | 2021-05-07 |
| CN112768323B CN112768323B (en) | 2022-09-06 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106663567A (en) * | 2014-08-26 | 2017-05-10 | 迪睿合株式会社 | Circuit board and method for mounting electronic component |
| CN107610988A (en) * | 2017-10-30 | 2018-01-19 | Aem科技(苏州)股份有限公司 | A kind of microsuper surface mounting fuse protector and its manufacture method |
| CN209912829U (en) * | 2019-04-19 | 2020-01-07 | 宁波芯合动力锂电池科技有限公司 | Overheating self-breaking fuse |
-
2020
- 2020-12-28 CN CN202011578673.7A patent/CN112768323B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106663567A (en) * | 2014-08-26 | 2017-05-10 | 迪睿合株式会社 | Circuit board and method for mounting electronic component |
| CN107610988A (en) * | 2017-10-30 | 2018-01-19 | Aem科技(苏州)股份有限公司 | A kind of microsuper surface mounting fuse protector and its manufacture method |
| CN209912829U (en) * | 2019-04-19 | 2020-01-07 | 宁波芯合动力锂电池科技有限公司 | Overheating self-breaking fuse |
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| CN112768323B (en) | 2022-09-06 |
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