CN117352346A - Auxiliary thermal fuse and manufacturing method thereof - Google Patents
Auxiliary thermal fuse and manufacturing method thereof Download PDFInfo
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- CN117352346A CN117352346A CN202311653864.9A CN202311653864A CN117352346A CN 117352346 A CN117352346 A CN 117352346A CN 202311653864 A CN202311653864 A CN 202311653864A CN 117352346 A CN117352346 A CN 117352346A
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- 229910000743 fusible alloy Inorganic materials 0.000 claims abstract description 66
- 239000004033 plastic Substances 0.000 claims abstract description 46
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 19
- 238000002844 melting Methods 0.000 claims abstract description 10
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- 238000000034 method Methods 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 13
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- 238000012545 processing Methods 0.000 claims description 9
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- 239000000956 alloy Substances 0.000 claims description 8
- 239000012943 hotmelt Substances 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- 239000004519 grease Substances 0.000 claims description 6
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- 239000000565 sealant Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000005476 soldering Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 description 8
- 150000002739 metals Chemical class 0.000 description 7
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Classifications
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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
- H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
-
- 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
-
- 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
- H01H85/0241—Structural association of a fuse and another component or apparatus
-
- 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
-
- 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
- H01H85/055—Fusible members
- H01H85/06—Fusible members characterised by the fusible material
-
- 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
- H01H85/055—Fusible members
- H01H85/12—Two or more separate fusible members in parallel
-
- 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
- H01H85/165—Casings
- H01H85/175—Casings characterised by the casing shape or form
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Fuses (AREA)
Abstract
The invention discloses an auxiliary thermal fuse and a manufacturing method thereof, wherein the auxiliary thermal fuse comprises a high-insulation shell, a hardware terminal electrode block, a ceramic cover plate, a hot melting assembly and a plastic shell cover, wherein the high-insulation shell is hollow and is provided with an opening at the top end; a plurality of heat-sensitive fusible alloys are arranged between the two hardware terminal electrode blocks, the heat-sensitive fusible alloys are inserted into the inner side of the high-insulation shell, and a fluxing agent is injected into the high-insulation shell and covers the heat-sensitive fusible alloys; the ceramic cover plate covers the solidified fluxing agent; the hot melting assembly comprises ceramic heating plates, an over-temperature fuse and high-insulation wires, wherein the ceramic heating plates are vertically and relatively flatly attached to two side surfaces of the inner portion of the hardware terminal electrode block, the two ceramic heating plates are provided with the over-temperature fuse, the over-temperature fuse is connected with the ceramic heating plates, the two high-insulation wires are arranged, and the two high-insulation wires are respectively connected with the two ceramic heating plates.
Description
Technical Field
The invention relates to the technical field of fuses, in particular to an auxiliary thermal fuse and a manufacturing method thereof.
Background
The over-temperature fuse of single-group circuit design occupies more than about 95% of the current over-temperature fuse market, and the over-temperature fuse of single-group circuit design always has the phenomenon of slow response in the protection process, so that the temperature of the protected components is raised too fast under the protection effect of the fuse, and the burning phenomenon is caused.
Thus, some fast-breaking fuses are now on the market, for example, chinese patent application publication No. CN108987210a discloses a fast-breaking high-current controlled fuse, which includes a heat generating device and a current passing device; the through-flow device comprises two electrode pins which are separated from each other, and one or more first fusing devices connected between the two electrode pins, wherein the first fusing devices have a first action temperature; the first fusing device is arranged adjacent to the heating device and is insulated from the heating device. Because the fusing device in the through-flow device is tightly attached to the heating device, the heat conduction path is shortened, the power loss caused by heat diffusion is reduced, therefore, when the system detects that the fault starts heating, the system can quickly execute a cutting instruction and has self-overheat protection, the thermal runaway of the heating plate is prevented, the increased remote signaling function is realized, a remote signaling signal can be provided, and the system is informed that the cutting instruction is executed.
The patent provides a quick-break type fuse, but the existing quick-break type fuse has high production and welding difficulty, and the heating sheet is easy to generate impact force fragments due to expansion of a cosolvent, so that the problem of scrapping of the heating sheet is caused.
Disclosure of Invention
The invention aims to provide an auxiliary thermal fuse and a manufacturing method thereof, and aims to solve the problems that the conventional quick-break fuse is high in production and welding difficulty, and a heating sheet is easy to generate impact force fragments due to expansion of a cosolvent, so that the heating sheet is scrapped.
In order to achieve the above object, according to one aspect of the present invention, there is provided an auxiliary thermal fuse comprising a high insulation housing having a hollow interior and an open top;
the heat-sensitive fusible alloy is inserted into the inner side of the high-insulation shell, and a fluxing agent is injected into the high-insulation shell and covers the heat-sensitive fusible alloy;
the ceramic cover plate covers the solidified fluxing agent;
the hot melting assembly comprises ceramic heating plates, an over-temperature fuse and high-insulation wires, wherein the ceramic heating plates are vertically and relatively flatly attached to two side surfaces of the inner part of the hardware terminal electrode block, the over-temperature fuse is arranged between the two ceramic heating plates and connected with the ceramic heating plates, the two high-insulation wires are arranged, and the two high-insulation wires are respectively connected with the two ceramic heating plates;
and the plastic shell cover is arranged at the top end opening of the high-insulation shell.
Still further, high insulating housing both sides top is equipped with the bayonet socket, just high insulating housing front end is equipped with two draw-in grooves, the inside bottom of high insulating housing evenly is equipped with a plurality of partition walls, the partition wall separates the inboard bottom of high insulating housing into a plurality of spaces, every heat-sensitive fusible alloy of five metals terminal electrode piece imbeds in every space respectively.
Still further, two the relative one side of five metals terminal electrode piece is even to be equipped with a plurality of welded junctions, the quick alloy card of thermal sensitive fuse is in the welded junction and welded on the five metals terminal electrode piece, five metals terminal electrode piece kink department is equipped with the through-hole, just the position that the five metals terminal stretches out high insulating housing is equipped with the pin, the pin middle part is equipped with external hole, the quick alloy of thermal sensitive fuse is cylindric.
Furthermore, the ceramic heating plates are of sheet-shaped structures, the surfaces of the ceramic heating plates are coated with heat-conducting silicone grease, the heat-conducting silicone grease is low in thermal resistance and viscosity, and wiring grooves are formed in the front ends of the two opposite surfaces of the ceramic heating plates and are used for being connected with high-insulation wires.
Furthermore, the over-temperature fuse and the ceramic heating sheet are connected in series and welded through connecting wires, and the high insulating wire is wrapped with a high insulating sheath for ensuring that the high insulating wire has a better insulating effect.
Still further, the plastic case lid evenly is equipped with a plurality of teeth towards the inside one side of high insulating housing, just plastic case lid is to Ji Gao insulating housing inboard corner position all is equipped with the corner cylinder, be equipped with a plurality of perforation on the high insulating housing.
According to a second aspect of the present invention, there is provided a method for manufacturing an auxiliary thermal fuse for manufacturing the auxiliary thermal fuse, the method comprising the following specific steps:
s1: processing high insulation shell and plastic shell cover
Processing the high-insulation shell and the plastic shell cover according to a drawing, effectively removing burrs on the surface of the high-insulation shell and burrs on the plastic shell cover, ensuring that the high-insulation shell meets the production standard, and simultaneously ensuring that the high-insulation shell and the plastic shell cover can be mutually matched for effective matching;
s2: processing hardware terminal electrode block
The two hardware terminal electrode blocks are oppositely placed, two ends of the heat-sensitive fusible alloy are respectively clamped on the two hardware terminal electrode blocks, and then the heat-sensitive fusible alloy is welded on the hardware terminal electrode blocks in a current welding or laser welding mode;
s3: assembly hot melt assembly
Connecting the two ceramic heating plates with the over-temperature fuse, and then connecting the high-insulation wires with the ceramic heating plates respectively;
s4: assembled auxiliary thermal fuse
Inserting the structure of the hardware terminal electrode block matched with the heat-sensitive fusible alloy into the high-insulation shell, and enabling the heat-sensitive fusible alloy to be close to the bottom end of the high-insulation shell; then injecting the flux dissolved in liquid state into the high-insulation shell, and covering the ceramic cover plate on the solidified flux after the flux is solidified; then the assembled hot melting assembly is arranged on the inner side of the high-insulation shell, and the ceramic heating sheet is vertically and relatively flatly attached to the inner side surface of the hardware terminal electrode block;
s5: plastic shell cover packaging
Coating a prepared epoxy resin sealant on the edge of the top opening of the high-insulation shell, and fastening a plastic shell cover at the top opening of the high-insulation shell so that the plastic shell is tightly adhered and connected with the high-insulation shell;
s6: different test currents are respectively applied to the assembled auxiliary thermal fuse, the average melt temperature of the auxiliary thermal fuse at the same moment is measured, and the average running time of the auxiliary thermal fuse is predicted through a running time estimation model, wherein the running time estimation model specifically comprises the following steps:，
wherein,for average run time, +.>For undetermined coefficients, +.>Is Boltzmann constant, & gt>For the average melt temperature, +.>Activation energy for the solution to be determined;
s7: calculating the coefficient to be determined of the running time estimation model according to a least square methodActivation energy with undetermined solutionCalculated +.>、/>Substituting the operation time estimation model to determine the average operation time t of the auxiliary thermal fuse, so as to judge whether the auxiliary thermal fuse meets the standard according to the average operation time t.
Furthermore, in step S2, the soldering flux needs to be dipped at both ends of the heat-sensitive fusible alloy before welding the heat-sensitive fusible alloy, so as to facilitate better connection between the heat-sensitive fusible alloy and the hardware terminal electrode block.
Further, in the step S4, the flux is required to be covered with the heat-sensitive fusible alloy, and the heat-sensitive Yi Rong alloy cannot be exposed.
Furthermore, in step S5, the plastic shell cover and the high-temperature insulating shell are bonded by using the epoxy resin sealant and then are baked and cured at a low temperature, so that the bonding between the plastic shell cover and the high-temperature insulating shell is more stable.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention greatly improves the defect of slow response of the traditional single-group circuit design, effectively and quickly responds and protects components from being burnt, achieves the real quick protection effect, and ensures that the heat-sensitive fusible alloy is convenient to melt and weld by current welding or laser welding, and has simple and convenient operation. Meanwhile, the ceramic heating plate is vertically installed, and the high impact force of the fluxing agent in thermal expansion can be effectively reduced in comparison with the flat mounting, so that the failure of the fragments can be avoided.
2. The main path alloy wire groove inside the high-insulation shell is provided with the multi-component partition wall, so that the multi-component flow distribution effect is carried out on the heavy current, and the explosion phenomenon of single-group heavy current breaking test is avoided.
3. The plastic shell cover adopts tooth, perforation and corner column designs, so that the adhesive force between the plastic shell cover and epoxy resin is effectively increased in a tooth shape; the perforation plays an exhaust role in the production of dispensing; and the corner column body effectively increases the binding force with the four corners of the shell.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the structure of the high insulation housing of the present invention;
FIG. 3 is a schematic view of the structure of the hardware terminal electrode block of the present invention;
FIG. 4 is a schematic view of the structure of the hot melt assembly of the present invention;
FIG. 5 is a schematic view of the structure of the plastic case cover of the present invention;
fig. 6 is a flowchart of a method for manufacturing an auxiliary thermal fuse according to the present invention.
In the figure: 1. a high insulation housing; 11. a bayonet; 12. a clamping groove; 13. a partition wall; 2. a hardware terminal electrode block; 21. a welding port; 22. a heat sensitive fusible alloy; 23. a through hole; 24. pins; 25. an external hole; 3. a hot melt assembly; 31. a ceramic heating sheet; 311. wiring grooves; 32. an over-temperature fuse; 33. connecting wires; 34. a high insulation wire; 4. a ceramic cover plate; 5. a plastic shell cover; 51. perforating; 52. corner columns; 53. teeth.
Detailed Description
The following is further described with reference to the accompanying drawings and specific examples:
example 1
As shown in fig. 1 and 2, the present embodiment provides an auxiliary thermal fuse, which includes a high insulation housing 1, a hardware terminal electrode block 2, a ceramic cover plate 4, a heat fusion module 3, and a plastic housing cover 5; the inside of the high-insulation shell 1 is hollow and the top end of the high-insulation shell is provided with an opening; the bayonet 11 is arranged at the tops of the two sides of the high-insulation shell 1, the bayonet 11 is convenient to match with the hardware terminal electrode block 2, and accurate installation of the hardware terminal electrode block 2 is guaranteed. And the front end of the high-insulation shell 1 is provided with two clamping grooves 12, and the clamping grooves 12 are convenient for clamping the high-insulation wires 34, so that the high-insulation wires 34 conveniently extend out of the high-insulation shell 1. The inside bottom of high insulating housing 1 evenly is equipped with a plurality of partition walls 13, and partition wall 13 separates the inboard bottom of high insulating housing 1 into a plurality of spaces, and every heat-sensitive fusible alloy 22 of five metals terminal electrode piece 2 imbeds in every space respectively, and this kind of structure carries out the multiunit effect of shunting to the heavy current, avoids single big electric current of group to break up the test and appears the explosion phenomenon.
As shown in fig. 3, two metal terminal electrodes are provided, a plurality of heat-sensitive fusible alloy 22 is provided between two metal terminal electrode blocks 2, the heat-sensitive fusible alloy 22 is inserted into the inside of the high insulating case 1, and a flux is injected into the high insulating case 1, and covers the heat-sensitive fusible alloy 22; the structure can be effectively matched with the thermosensitive fusible alloy 22 to be used, and the thermosensitive fusible alloy 22 is prevented from stably playing a role. A plurality of welding ports 21 are uniformly formed on the opposite surfaces of the two hardware terminal electrode blocks 2, and the welding ports 21 are convenient for welding the heat-sensitive fusible alloy 22. The heat-sensitive fusible alloy 22 is clamped in the welding port 21 and welded on the hardware terminal electrode block 2, a through hole 23 is formed in the bending position of the hardware terminal electrode block 2, a pin 24 is arranged at the position of the hardware terminal, which protrudes out of the high-insulation shell 1, an external hole 25 is formed in the middle of the pin 24, the heat-sensitive fusible alloy 22 is cylindrical, meanwhile, the hardware terminal electrode block 2 with the structure reduces the production welding difficulty, the shrinkage space of alloy wires during main road fusing is expanded, the design of the bending position through hole 23 is adopted for the hardware terminal, epoxy resin is filled and sealed rapidly, the production efficiency is improved, the electrode plate is firmly stressed and is not loosened, and the sealing effect is better. A ceramic cover plate 4 is placed over the cured flux to facilitate separation of the hot melt assembly 3 from the heat sensitive fusible alloy 22.
As shown in fig. 4, the hot melting assembly 3 includes a ceramic heating plate 31, an overheat fuse 32 and a high insulation wire 34, where the ceramic heating plate 31 is vertically and relatively flatly attached to two sides of the inside of the hardware terminal electrode block 2, the ceramic heating plate 31 is installed in a vertical manner, and the relatively flatly attached installation can effectively reduce the high impact force of the fluxing agent during thermal expansion without occurrence of a failure phenomenon of the fragments, and of course, the ceramic heating plate 31 is in a sheet structure, such as a cylindrical, polygonal diamond or toothed structure, so that the impact preventing effect is better. An over-temperature fuse 32 is arranged between the two ceramic heating plates 31, the over-temperature fuse 32 is connected with the ceramic heating plates 31, and the over-temperature fuse 32 is conveniently triggered after the fluxing agent is heated and expanded, so that the purpose of breaking circuit is achieved, and components are effectively protected. The two high-insulation wires 34 are arranged, and the two high-insulation wires 34 are respectively connected with the two ceramic heating plates 31; this structure is convenient for the main circuit and the whole auxiliary thermal fuse. The ceramic heating plate 31 is of a sheet-shaped structure, and the ceramic heating plate 31 is of a sheet-shaped structure, so that the stress of the ceramic heating plate 31 is conveniently reduced. The surface of the ceramic heating sheet 31 is coated with heat-conducting silicone grease, which is low in thermal resistance and viscosity, and can reduce heat transfer, when the heat is large, the heat can trigger the heat-sensitive fusible alloy 22 through the hardware terminal electrode block 2, the heat-sensitive fusible alloy 22 can expand a fluxing agent, and after the fluxing agent collides, the over-temperature fuse 32 is fused. And the front ends of the two opposite ceramic heating plates 31 are respectively provided with a wiring groove 311, the wiring grooves 311 are used for being connected with the high-insulation wires 34, the over-temperature fuses 32 and the ceramic heating plates 31 are connected in series and welded through the connection wires 33, and the high-insulation wires 34 are wrapped with high-insulation leather outside and used for ensuring that the high-insulation wires 34 have better insulation effects.
Example two
As shown in fig. 1 and 2, the present embodiment provides an auxiliary thermal fuse, which includes a high insulation housing 1, a hardware terminal electrode block 2, a ceramic cover plate 4, a heat fusion module 3, and a plastic housing cover 5; the inside of the high-insulation shell 1 is hollow and the top end of the high-insulation shell is provided with an opening; the bayonet 11 is arranged at the tops of the two sides of the high-insulation shell 1, the bayonet 11 is convenient to match with the hardware terminal electrode block 2, and accurate installation of the hardware terminal electrode block 2 is guaranteed. And the front end of the high-insulation shell 1 is provided with two clamping grooves 12, and the clamping grooves 12 are convenient for clamping the high-insulation wires 34, so that the high-insulation wires 34 conveniently extend out of the high-insulation shell 1. The inside bottom of high insulating housing 1 evenly is equipped with a plurality of partition walls 13, and partition wall 13 separates the inboard bottom of high insulating housing 1 into a plurality of spaces, and every heat-sensitive fusible alloy 22 of five metals terminal electrode piece 2 imbeds in every space respectively, and this kind of structure carries out the multiunit effect of shunting to the heavy current, avoids single big electric current of group to break up the test and appears the explosion phenomenon.
As shown in fig. 3, two metal terminal electrodes are provided, a plurality of heat-sensitive fusible alloy 22 is provided between two metal terminal electrode blocks 2, the heat-sensitive fusible alloy 22 is inserted into the inside of the high insulating case 1, and a flux is injected into the high insulating case 1, and covers the heat-sensitive fusible alloy 22; the structure can be effectively matched with the thermosensitive fusible alloy 22 to be used, and the thermosensitive fusible alloy 22 is prevented from stably playing a role. A plurality of welding ports 21 are uniformly formed on the opposite surfaces of the two hardware terminal electrode blocks 2, and the welding ports 21 are convenient for welding the heat-sensitive fusible alloy 22. The heat-sensitive fusible alloy 22 is clamped in the welding port 21 and welded on the hardware terminal electrode block 2, a through hole 23 is formed in the bending position of the hardware terminal electrode block 2, a pin 24 is arranged at the position of the hardware terminal, which protrudes out of the high-insulation shell 1, an external hole 25 is formed in the middle of the pin 24, the heat-sensitive fusible alloy 22 is cylindrical, meanwhile, the hardware terminal electrode block 2 with the structure reduces the production welding difficulty, the shrinkage space of alloy wires during main road fusing is expanded, the design of the bending position through hole 23 is adopted for the hardware terminal, epoxy resin is filled and sealed rapidly, the production efficiency is improved, the electrode plate is firmly stressed and is not loosened, and the sealing effect is better. A ceramic cover plate 4 is placed over the cured flux to facilitate separation of the hot melt assembly 3 from the heat sensitive fusible alloy 22.
As shown in fig. 4, the hot melting assembly 3 includes a ceramic heating plate 31, an overheat fuse 32 and a high insulation wire 34, where the ceramic heating plate 31 is vertically and relatively flatly attached to two sides of the inside of the hardware terminal electrode block 2, the ceramic heating plate 31 is installed in a vertical manner, and the relatively flatly attached installation can effectively reduce the high impact force of the fluxing agent during thermal expansion without occurrence of a failure phenomenon of the fragments, and of course, the ceramic heating plate 31 is in a sheet structure, such as a cylindrical, polygonal diamond or toothed structure, so that the impact preventing effect is better. An over-temperature fuse 32 is arranged between the two ceramic heating plates 31, the over-temperature fuse 32 is connected with the ceramic heating plates 31, and the over-temperature fuse 32 is conveniently triggered after the fluxing agent is heated and expanded, so that the purpose of breaking circuit is achieved, and components are effectively protected. The two high-insulation wires 34 are arranged, and the two high-insulation wires 34 are respectively connected with the two ceramic heating plates 31; this structure is convenient for the main circuit and the whole auxiliary thermal fuse. The ceramic heating plate 31 is of a sheet-shaped structure, and the ceramic heating plate 31 is of a sheet-shaped structure, so that the stress of the ceramic heating plate 31 is conveniently reduced. The surface of the ceramic heating sheet 31 is coated with heat-conducting silicone grease, which is low in thermal resistance and viscosity, and can reduce heat transfer, when the heat is large, the heat can trigger the heat-sensitive fusible alloy 22 through the hardware terminal electrode block 2, the heat-sensitive fusible alloy 22 can expand a fluxing agent, and after the fluxing agent collides, the over-temperature fuse 32 is fused. And the front ends of the two opposite ceramic heating plates 31 are respectively provided with a wiring groove 311, the wiring grooves 311 are used for being connected with the high-insulation wires 34, the over-temperature fuses 32 and the ceramic heating plates 31 are connected in series and welded through the connection wires 33, and the high-insulation wires 34 are wrapped with high-insulation leather outside and used for ensuring that the high-insulation wires 34 have better insulation effects.
As shown in fig. 5, a plastic case cover 5 is provided to cover the top opening of the high insulation case 1, which is each part for facilitating the installation of the flux. The plastic shell cover 5 is uniformly provided with a plurality of teeth 53 on one surface facing the inside of the high-insulation shell 1, the plastic shell cover 5 is aligned with corner columns 52 on the inner side corner position of the high-insulation shell 1, a plurality of perforations 51 are formed in the high-insulation shell 1, the plastic shell cover 5 adopts the design of the teeth 53, the perforations 51 and the corner columns 52, and the adhesive force between the plastic shell cover 5 and epoxy resin is effectively increased in a tooth shape; the perforation 51 plays a role of exhausting air during the production of dispensing; and the corner posts 52 effectively increase the binding force with the four corners of the housing.
Working principle: when the thermal fuse is used, the whole auxiliary thermal fuse is connected with a component to be protected, when the temperature of the protected component rises faster, the hardware terminal electrode block 2 can transfer heat to the heat-sensitive fusible alloy 22, the heat-sensitive fusible alloy 22 can trigger the fluxing agent after being heated, so that the fluxing agent is heated and expanded, the ceramic cover plate 4 can be extruded and damaged by the fluxing agent after being heated and expanded, and meanwhile, the over-temperature fuse 32 is fused, so that the purpose of protecting a circuit and preventing the protected component from being damaged is achieved.
In summary, the application combines practical application, has improved the shortcoming that former traditional single group circuit design response is slow greatly, and effective quick response protection components and parts are not burnt, reach the quick guard action in the true sense, and the quick fusible alloy of heat-sensitive is convenient to melt welding through electric current welding or laser welding with heat-sensitive fusible alloy 22, easy operation is convenient. Meanwhile, the ceramic heating plate 31 is installed vertically, so that the high impact force of the fluxing agent in thermal expansion can be effectively reduced in comparison with the flat mounting, and the failure of the fragments can be avoided.
Example III
As shown in fig. 6, the embodiment provides a method for manufacturing an auxiliary thermal fuse, which is used for manufacturing the auxiliary thermal fuse, and the method specifically includes the following steps:
s1: processing high insulation shell and plastic shell cover
According to the drawing, processing is carried out to high insulating housing 1 and plastic cap 5 to carry out effectual getting rid of high insulating housing 1 surface and plastic cap 5's burr, guarantee that high insulating housing 1 satisfies the production that standard, also guarantee simultaneously that high insulating housing 1 and plastic cap 5 can mutually support effectual cooperation and use.
S2: processing hardware terminal electrode block
The two hardware terminal electrode blocks 2 are oppositely placed, two ends of the thermosensitive fusible alloy 22 are respectively clamped on the two hardware terminal electrode blocks 2, and then the thermosensitive fusible alloy 22 is welded on the hardware terminal electrode blocks 2 in a current welding or laser welding mode; before welding the heat-sensitive fusible alloy 22, the two ends of the heat-sensitive fusible alloy 22 are required to be dipped with soldering flux, so that the heat-sensitive fusible alloy 22 can be conveniently welded to be better connected with the hardware terminal electrode block 2.
S3: assembly hot melt assembly
The two ceramic heat generating plates 31 are connected to the thermal fuse 32, and then the high-insulation wires 34 are connected to the ceramic heat generating plates 31, respectively.
S4: assembled auxiliary thermal fuse
Inserting the structure of the hardware terminal electrode block 2 matched with the heat-sensitive fusible alloy 22 into the high-insulation shell 1, and enabling the heat-sensitive fusible alloy 22 to be close to the bottom end of the high-insulation shell 1; then, injecting the flux dissolved in liquid state into the high-insulation shell 1, and covering the ceramic cover plate 4 on the solidified flux after the flux is solidified; then the assembled hot melting assembly 3 is arranged on the inner side of the high-insulation shell 1, and the ceramic heating plate 31 is ensured to be vertically and relatively flatly attached to the inner side surface of the hardware terminal electrode block 2; the flux is required to cover the heat sensitive fusible alloy 22 and the heat sensitive Yi Rong alloy cannot be exposed.
S5: plastic shell cover packaging
Coating a prepared epoxy resin sealant on the edge of the top opening of the high-insulation shell 1, and fastening a plastic shell cover 5 at the top opening of the high-insulation shell 1 so that the plastic shell is tightly adhered and connected with the high-insulation shell 1; after the plastic cover 5 and the high-temperature insulating shell are adhered by the epoxy resin sealant, low-temperature baking and curing are needed, so that the adhesion between the plastic cover 5 and the high-temperature insulating shell is ensured to be more stable.
S6: different test currents are respectively applied to the assembled auxiliary thermal fuse, the average melt temperature of the auxiliary thermal fuse at the same moment is measured, and the average running time of the auxiliary thermal fuse is predicted through a running time estimation model, wherein the running time estimation model specifically comprises the following steps:，
wherein,for average run time, +.>For undetermined coefficients, +.>Is Boltzmann constant, & gt>For the average melt temperature, +.>Is the activation energy of the undetermined solution. The activation energy is the energy required for transferring the crystal atoms away from the equilibrium position to another new equilibrium or non-equilibrium position, also called activation energy, and the energy required for overcoming the action of starting a certain physicochemical process (such as plastic flow, atomic diffusion, chemical reaction, vacancy formation, etc.), which can be provided by the fluctuation of the energy of the system itself or by the outside, the smaller the activation energy, the easier the process is. That is to sayThe activation energy is the energy required by atoms on a lattice in a crystal to move to another lattice or gap position, and is an index reflecting the influence of temperature stress on the service life of a product. There is a potential barrier (activation energy) for the material in its transition from the normal, non-deactivated state to the deactivated state. The smaller the activation energy, the easier the physical process of failure will be; the larger the activation energy, the larger the acceleration coefficient, and the more likely it is to be accelerated to fail. In this embodiment, by applying different test currents to the assembled auxiliary thermal fuses, the average melt temperature of the auxiliary thermal fuses at the same time is measured, and the activation energy is used to predict the operation time (product service life) of the auxiliary thermal fuses.
S7: calculating the coefficient to be determined of the running time estimation model according to a least square methodActivation energy with undetermined solutionCalculated +.>、/>Substituting the operation time estimation model to determine the average operation time t of the auxiliary thermal fuse, so as to judge whether the auxiliary thermal fuse meets the standard according to the average operation time t.
In the embodiment, the weight coefficient a and the bias term b are fitted by a least square method, and the activation energy of the undetermined solution is calculated according to the weight coefficient a and the bias term bAnd pending coefficient->Calculated +.>And->Substituting the average running time into the running time estimation model to obtain the average running time +.>And further obtaining the running time of the auxiliary thermal fuse so as to judge whether the manufactured predicted auxiliary thermal fuse is qualified or not.
Specifically, it is provided with,x=1/T,/>,/>Then y=ax+b can be obtained, and curve fitting is performed by using a least square method, so that a and b are obtained, and the calculation formulas of a and b are as follows:
；/> 。
the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The auxiliary thermal fuse is characterized by comprising a high-insulation shell (1), wherein the high-insulation shell (1) is hollow and is provided with an opening at the top end;
the metal terminal electrode blocks (2) are arranged, a plurality of heat-sensitive fusible alloys (22) are arranged between the two metal terminal electrode blocks (2), the heat-sensitive fusible alloys (22) are inserted into the inner side of the high-insulation shell (1), and a fluxing agent is injected into the high-insulation shell (1) and covers the heat-sensitive fusible alloys (22);
a ceramic cover plate (4), wherein the ceramic cover plate (4) covers the solidified fluxing agent;
the hot melting assembly (3), the hot melting assembly (3) comprises ceramic heating plates (31), an over-temperature fuse (32) and high-insulation wires (34), wherein the ceramic heating plates (31) are vertically and relatively flatly attached to two inner side surfaces of the hardware terminal electrode block (2), the over-temperature fuse (32) is arranged between the two ceramic heating plates (31), the over-temperature fuse (32) is connected with the ceramic heating plates (31), the two high-insulation wires (34) are arranged, and the two high-insulation wires (34) are respectively connected with the two ceramic heating plates (31);
and the plastic shell cover (5) is arranged at the top end opening of the high-insulation shell (1) in a covering mode.
2. An auxiliary thermal fuse according to claim 1, wherein bayonets (11) are arranged at the tops of two sides of the high-insulation shell (1), two clamping grooves (12) are formed in the front end of the high-insulation shell (1), a plurality of partition walls (13) are uniformly arranged at the bottom end inside the high-insulation shell (1), the partition walls (13) divide the bottom inside the high-insulation shell (1) into a plurality of spaces, and each heat-sensitive fusible alloy (22) of the hardware terminal electrode block (2) is embedded into each space respectively.
3. The auxiliary thermal fuse according to claim 1, wherein two opposite surfaces of the hardware terminal electrode block (2) are uniformly provided with a plurality of welding ports (21), the heat-sensitive fusible alloy (22) is clamped in the welding ports (21) and welded on the hardware terminal electrode block (2), a through hole (23) is formed in the bent part of the hardware terminal electrode block (2), a pin (24) is arranged at the position of the hardware terminal, which protrudes out of the high-insulation shell (1), an external hole (25) is formed in the middle of the pin (24), and the heat-sensitive fusible alloy (22) is cylindrical.
4. An auxiliary thermal fuse according to claim 1, wherein the ceramic heating plates (31) are of a sheet-like structure, the surfaces of the ceramic heating plates (31) are coated with heat-conducting silicone grease, the heat-conducting silicone grease is low in thermal resistance and viscosity, and the front ends of the two opposite ceramic heating plates (31) are respectively provided with a wiring groove (311), and the wiring grooves (311) are used for being connected with high-insulation wires (34).
5. An auxiliary thermal fuse as claimed in claim 4, wherein said thermal fuse (32) and said ceramic heat generating plate (31) are connected in series and welded by a connecting wire (33), and said high-insulation wire (34) is covered with a high-insulation sheath for ensuring a better insulation effect of said high-insulation wire (34).
6. An auxiliary thermal fuse according to claim 1, wherein a plurality of teeth (53) are uniformly arranged on one surface of the plastic shell cover (5) facing the inside of the high-insulation shell (1), corner columns (52) are arranged on the plastic shell cover (5) at the inner side corner positions of the Ji Gao insulation shell (1), and a plurality of through holes (51) are formed in the high-insulation shell (1).
7. A method for manufacturing an auxiliary thermal fuse according to any one of claims 1 to 6, comprising the following specific steps:
s1: processing high insulation shell and plastic shell cover
Processing the high-insulation shell (1) and the plastic shell cover (5) according to a drawing, effectively removing burrs on the surface of the high-insulation shell (1) and the plastic shell cover (5), ensuring that the high-insulation shell (1) meets the production standard, and simultaneously ensuring that the high-insulation shell (1) and the plastic shell cover (5) can be mutually matched for effective matching;
s2: processing hardware terminal electrode block
The two hardware terminal electrode blocks (2) are oppositely placed, two ends of the heat-sensitive fusible alloy (22) are respectively clamped on the two hardware terminal electrode blocks (2), and then the heat-sensitive fusible alloy (22) is welded on the hardware terminal electrode blocks (2) in a current welding or laser welding mode;
s3: assembly hot melt assembly
Two ceramic heating plates (31) are connected with an overheat fuse (32), and then high-insulation wires (34) are respectively connected with the ceramic heating plates (31);
s4: assembled auxiliary thermal fuse
Inserting the structure of the hardware terminal electrode block (2) matched with the heat-sensitive fusible alloy (22) into the high-insulation shell (1), and enabling the heat-sensitive fusible alloy (22) to be close to the bottom end of the high-insulation shell (1); then, injecting the flux dissolved in a liquid state into the high-insulation shell (1), and covering the ceramic cover plate (4) on the solidified flux after the flux is solidified; then, the assembled hot melting assembly (3) is arranged on the inner side of the high-insulation shell (1), and the ceramic heating plate (31) is vertically and relatively flatly attached to the inner side surface of the hardware terminal electrode block (2);
s5: plastic shell cover packaging
Coating a prepared epoxy resin sealant on the edge of the top end opening of the high-insulation shell (1), and then fastening a plastic shell cover (5) at the top end opening of the high-insulation shell (1) so that the plastic shell is tightly adhered and connected with the high-insulation shell (1);
s6: different test currents are respectively applied to the assembled auxiliary thermal fuse, the average melt temperature of the auxiliary thermal fuse at the same moment is measured, and the average running time of the auxiliary thermal fuse is predicted through a running time estimation model, wherein the running time estimation model specifically comprises the following steps:
wherein->For average run time, +.>For undetermined coefficients, +.>Is Boltzmann constant, & gt>For the average melt temperature, +.>Activation energy for the solution to be determined;
s7: calculating the coefficient to be determined of the running time estimation model according to a least square methodActivation energy with pending solution->Calculated +.>、/>Substituting the operation time estimation model to determine the average operation time t of the auxiliary thermal fuse, so as to judge whether the auxiliary thermal fuse meets the standard according to the average operation time t.
8. The method for manufacturing the auxiliary thermal fuse according to claim 7, wherein in the step S2, soldering flux is required to be applied to both ends of the heat-sensitive fusible alloy (22) before the heat-sensitive fusible alloy (22) is soldered, so that the heat-sensitive fusible alloy (22) can be conveniently soldered to the hardware terminal electrode block (2) better.
9. The method of manufacturing a secondary thermal fuse according to claim 7, wherein in said step S4, the flux is covered with a thermosensitive fusible alloy (22), and the thermosensitive Yi Rong alloy cannot be exposed.
10. The method for manufacturing the auxiliary thermal fuse according to claim 7, wherein in the step S5, the plastic cover (5) and the high-temperature insulating housing are bonded by using the epoxy resin sealant and then are baked and cured at a low temperature, so that the bonding between the plastic cover (5) and the high-temperature insulating housing is more stable.
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| CN202311653864.9A CN117352346B (en) | 2023-12-05 | 2023-12-05 | Auxiliary thermal fuse and manufacturing method thereof |
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| CN202311653864.9A CN117352346B (en) | 2023-12-05 | 2023-12-05 | Auxiliary thermal fuse and manufacturing method thereof |
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| JP2005026188A (en) * | 2003-07-03 | 2005-01-27 | Koa Corp | Current fuse and manufacturing method of current fuse |
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| CN205900482U (en) * | 2016-06-07 | 2017-01-18 | 厦门赛尔特电子有限公司 | Lamination type temperature safeties |
| CN108987210A (en) * | 2017-05-31 | 2018-12-11 | 厦门赛尔特电子有限公司 | A kind of controlled fuse of type high current disconnected fastly |
| CN216487519U (en) * | 2021-11-12 | 2022-05-10 | 李燕君 | Composite resistor |
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- 2023-12-05 CN CN202311653864.9A patent/CN117352346B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005026188A (en) * | 2003-07-03 | 2005-01-27 | Koa Corp | Current fuse and manufacturing method of current fuse |
| CN202210498U (en) * | 2011-04-08 | 2012-05-02 | 厦门赛尔特电子有限公司 | Controlled fusing current protector |
| CN205900482U (en) * | 2016-06-07 | 2017-01-18 | 厦门赛尔特电子有限公司 | Lamination type temperature safeties |
| WO2017211295A1 (en) * | 2016-06-07 | 2017-12-14 | 厦门赛尔特电子有限公司 | Stack-type temperature safety device |
| CN108987210A (en) * | 2017-05-31 | 2018-12-11 | 厦门赛尔特电子有限公司 | A kind of controlled fuse of type high current disconnected fastly |
| CN216487519U (en) * | 2021-11-12 | 2022-05-10 | 李燕君 | Composite resistor |
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| CN117352346B (en) | 2024-02-23 |
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