I have a bug vacuum (toy) and it doesn't work very well. The vacuum has 3 power settings and is turned on by pressing a trigger. I was gonna just pull out the circuit board and add more batteries, but it seemed like a good idea to ask on the internet first, because I know very little about electronics and stuff. Some advice from somebody who knows what they're doing would be much appreciated.
I don't think the seal between the impeller blades and the side of the enclosure is very good. This is a toy, after all. It looks like air is sucked into the middle and pushed outwards. You may be able to do something with some caulk. It looks like it uses 2 C or D cells now for 3 volts, you could up it to 3 cells for 4.5 volts. The motor may burn out. .
Don't waste your time on it. With both the small size and design of that BI fan you are not going to get a vacuum of more than a couple inches of water. It is designed more for volume than for suction. In comparison, none of the hand- held so called vacuum cleaners are much better and they usually have better impellers.
The best way to make a vacuum stronger is to make a best valve.
