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Come on, come on, Soso Soso! ! ! ! ! ! ! Science! ! ! ! ! ! ! ! Principle of balloon pump
1. One-way joint, when inflating, the valve of the joint is pushed open by atmospheric pressure, and the gas enters the air pump, while when inflating the tire, the valve is closed by the air pressure in the air pump, and the gas enters the tire.

It also uses atmospheric pressure.

2. The principle of balloon pump

In fact, the balloon pump is the simplest one-way valve! When the pull rod is lifted, the cup installed at the lower end of the pull rod contracts, so that air enters the air pump from the small hole on the cover of the air pump (some have no hole, but enter from the big gap between the pull rod and the cover). When the pull rod is pressed down, the cup expands and sticks to the inner wall of the air pump, pressing the air down! Gas can only enter the tire valve from the small hole at the bottom of the pump along the small iron beads (some with small iron sheets) of the rubber hose!

When the pull rod was lifted for the second time, the cup contracted again. At this time, the small iron ball falls to block the small hole, so that the air in the tire that was not completely filled for the first time will not be pumped out!

This is the process of going back and forth.

1 or 2, choose one.

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