Inside a Poundland bubble bear

They may just be kids (or adults) toys, but some of the bubble blowing machines are very clever.

It makes me think that there might be someone whose full time job is designing mechanisms for these things.

This one is very neat. It has a motor with the fan on one end and the other end geared to turn a peristaltic pump and also a wiper arm. The pump uses rotating rollers to squeeze liquid through a tube to a port in the bubble producing section, and the arm then wipes that around the perimeter to create a film that the air then blows into bubbles.

Because the feed and drain tubes are sealed into the bubble fluid reservoir, and because some of the fluid is being blown out as bubbles, there is a net difference that results in the drain tube pulling the excess liquid back down into the reservoir.

The bubble fluid is mainly water with a small percentage of surfactant and a tiny amount of a thickening agent to make the bubbles stronger.



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