Arc extinction slurry for fuse protector

A fuse and arc extinguishing technology, applied in electrical components, circuits, emergency protection devices, etc., can solve the problems of difficult to paste surface mount micro fuses, limited application scope, loss, etc., to quickly absorb or transmit arcs The effect of energy, low production cost and simple operation

Active Publication Date: 2014-02-26
NANJING SART SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since surface mount miniature fuses all have halogen-free requirements, and halogen salts have strong moisture absorption properties, they have a greater impact on the reliability of metal melts during long-term use, so the application range of this improvement is extremely limited. big limit
Patents FR2927465A1, US8089023B2, CA101503540A, etc. disclose a circuit breaker housing made of arc-extinguishing resin processed products with excellent arc-extinguishing performance, heat resistance, pressure resistance and molding processability, including polyolefin resin, There are three parts of crosslinking agent and metal hydroxide. Patents US2008237194A1, CN101615525A, etc. also disclose a bushing or liner for a fuse made of arc-extinguishing materials such as metal hydroxide or melamine and an adhesive. When the material contacts the arc, water vapor is generated to extinguish the arc, and the residue formed by the remaining solid composition does not reduce the dielectric strength of the composition. However, although such arc extinguishing materials have relatively high arc extinguishing properties, they are usually molded, Extruded into a fuse body, it is difficult to make a paste form and apply it to a surface mount miniature fuse
CN202977346U discloses a high-voltage surface-mounted tubular fuse, by filling a silicone layer around the melt in the insulating tube, using the high insulation and high voltage breakdown capability of the silicone to extinguish the arc, and utilizing the elasticity of the silicone itself To absorb the energy generated during the melting process of the fuse, however, in actual operation, this structure loses its expected effect when the rated breaking capacity of the fuse exceeds 250VAC / 50A

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The preparation method of the arc extinguishing slurry for the above-mentioned fuse comprises the following steps:

[0023] 1) Weigh and mix the phenolic resin and the organic solvent respectively according to the weight ratio, and stir at a temperature of 20-80°C to completely dissolve the phenolic resin particles;

[0024] 2) Weigh the gas-producing material and quartz sand respectively by weight, and add them to the mixed solution obtained in step 1;

[0025] 3) Adding deionized water to adjust the viscosity of the slurry to a viscosity range that can be potted or printed, so as to obtain an arc-extinguishing slurry for surface mount miniature fuses with high breaking capacity.

Embodiment 1

[0027] Take by weighing 0.128g of phenolic resin, 0.646g of dehydrated alcohol, heat and stir in 40 ℃ of water baths, make phenolic resin dissolve completely; In the solution that obtains, add 1.067g urea-formaldehyde resin powder, 0.326g coarse quartz sand (particle size is 200 mesh), 0.200g fine quartz sand (grain size is 500 mesh), and then add 0.767g deionized water to adjust its viscosity to 10 Pa·s potting slurry.

[0028] Form a rectangular opening of 0.3mm*0.05mm in the middle of one side of the ceramic tube, and assemble it into a surface mount fuse with a rated current of 2A and a size of 6.1mm*2.5mm*2.5mm according to the normal process. And put it in the potting slurry obtained above, vacuumize the slurry for 10 minutes, make the arc extinguishing slurry potted inside the shell, then use tap water to clean the surface of the fuse, and press 50°C / 20minà80°C / 20minà100°C / 30min drying process to obtain a high-voltage fuse with a breaking capacity of 250VAC / 100A.

[0...

Embodiment 2

[0031]Take boron modified high temperature resistant phenolic resin 0.089g, DMF 0.356g, stir at room temperature until resin dissolves completely, then add 0.601g urea-formaldehyde resin, 1.499g coarse quartz sand (particle size is 250 orders), 1.052g fine quartz sand (particle size 800 mesh), and 1.075g of deionized water was added to adjust the viscosity of the slurry to obtain the arc extinguishing slurry for the surface mount miniature fuse with high breaking capacity of the present invention.

[0032] According to the assembly process of Example 1, a surface-mount fuse with a rated current of 4A and a size of 6.1mm*2.5mm*2.5mm was obtained, and placed in the potting slurry obtained above, and the slurry was vacuumed for 10 minutes, so that The arc extinguishing slurry is filled into the inside of the shell, and then the surface of the fuse is cleaned with tap water, and cured according to the drying process of 50°C / 20min→80°C / 20min→100°C / 30min to obtain a high-voltage fuse...

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PUM

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Abstract

The invention relates to arc extinction slurry for a fuse protector. The arc extinction slurry comprises, by weight, 5-40 parts of gas production materials, 0-10 parts of phenol formaldehyde resin, 20-60 parts of quartz sand, 0.6-10 parts of organic solvents and15-30 parts of deionized water. The gas production materials are mainly urea-formaldehyde resin and other powder materials; the phenol formaldehyde resin can be boron-modified phenol formaldehyde resin and other high-temperature-resistant resin which is soluble in organic solvents, and the main effect of the phenol formaldehyde resin is to improve the heat-resistant performance of urea-formaldehyde resin; the periphery of a melt is covered with the arc extinction slurry in a filling mode or a thick film printing mode or the like, and gas will be produced under the action of an electric arc so as to extinguish the electric arc; fast cooling of the metallic melt is guaranteed by adding the quartz sand, and therefore the arc extinction slurry can be used on the breaking occasion of high voltage and great current of more than 250VAC/100A. The arc extinction slurry has the predominant advantages of being low in production cost, easy to operate, free of halogen, friendly to environment, high in arc extinction ability and the like, thereby being suitable for being used in a current common tube shell type or thick film printing type surface-mounted miniature fuse protector.

Description

technical field [0001] The invention relates to an arc extinguishing slurry for a surface-mounted miniature fuse with a breaking capacity of 250VAC / 100A or more, in particular to an arc extinguishing slurry with a gas-generating arc extinguishing material as a base, and a preparation method of the slurry. Background technique [0002] The fuse is mainly composed of a melt and an insulator that supports or protects the melt. It uses a metal material or paste with a lower melting point to make a metal wire or a sheet electrode as a melt, which is connected in series in the protected circuit. When the circuit or When the equipment in the circuit is overloaded or fails, the melt is instantly fused due to heat, thereby cutting off the circuit and achieving the purpose of protecting the circuit or equipment. With the development of miniaturization of fuses, the breaking safety of fuses has gradually become an important factor to be considered in high-voltage and high-current appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H85/42
Inventor 南式荣刘明龙
Owner NANJING SART SCI & TECH DEV
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