Dust explosion device

Abstract

The invention relates to a dust explosion device comprising a container and an ignition device, wherein the container is used for loading powdery combustible materials, provided with an opened upper end and cooperatively provided with an outer cover. The dust explosion device is characterized in that the ignition device comprises a spiral-shaped electric heating wire and an electric connecting wire which connects the spiral-shaped electric heating wire with a low-voltage power supply positioned outside the container. By adopting the structure, the spiral-shaped electric heating wire emits heat to ignite a match head by only inserting the match head into an inner cavity of the spiral-shaped electric heating wire, tightly closing the outer cover, shaking the container loaded with the combustible materials up and down and connecting an externally connecting wire of the spiral-shaped electric heating wire with the low-voltage power supply, and the match head can ignite dust so as to explode the outer cover upwards. The invention has the benefits that: a plurality of experiments can be carried out within one or two days by drying starch and flour for one time, and the experiment success rate approaches to 100 percent. The invention has the advantages of low dryness requirement, good repeatability and convenient and safe operation without causing power failure accidents.

Description

Technical field [0001] The invention relates to a teaching instrument, in particular to a dust explosion device. Background technique [0002] Dry dust will burn when exposed to an open flame, and an explosion will occur if it burns violently in a limited space. There is such a dust explosion experiment in the junior high school chemistry course: cut off the upper part of the empty metal can and the small plastic bottle, and punch a small hole slightly smaller than the outer diameter of the rubber tube on the bottom side of the metal can and the small plastic bottle, and connect them well. To make the device, put flour in a small plastic bottle, light a candle, and cover the mouth of the jar with a plastic lid. Blow air from one end of the rubber tube to fill the empty tank with flour, then observe the phenomenon and analyze the cause. But the experiment was not easy to succeed, so the following improvements were made: [0003] Improvement 1: In the experiment, put the dr...

AI Technical Summary

Problems solved by technology

[0005] Improvement 3: Change the above-mentioned candle ignition to short-circuit fire: put a small piece of copper wire (or a thinner fuse) in the dust container, connect it to the 220V power supply through the connecting line, press the lighting circuit switch, the copper wire ( or fuse) will immediately detonate the dust with high heat, the disadvantage is that the side effects are too large, often artificially causing many power outages

This device has caused several power outages in public classes at the local, city, and county levels, making it impossible for teachers to use computers and multimedia in subsequent classes.

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