How to use the bicycle pump?

The head of the tracheal clamp needs to be inserted into the inflation interface, the foot should be stepped on the bottom pedal, the pneumatic rod should be manually inserted up and down, and then the air pressure should be injected.

principle

When using the pump, connect the air outlet pipe to the valve of the bicycle tire. The function of this valve is to only allow air to enter the tire from the pump, but not allow air to flow back from the tire to the pump.

The principle of the old leather cup inflator: there is a gap between the piston of the inflator and the cylinder wall, and there is a downward concave rubber bowl on the piston. When the piston is pulled up, the air volume under the piston increases and the pressure decreases, and the air above the piston is squeezed to the bottom from around the rubber bowl. When the piston is pressed down, the amount of air under the piston decreases and the pressure increases.

Make the rubber bowl close to the cylinder wall to prevent air from leaking from above the piston, and continue to press the piston downward. When the air pressure is enough to open the valve core of the tire, compressed air will enter the tire. At the same time, the air outside the cylinder will enter the piston from the gap at the upper end of the cylinder.

The new pump with sliding outer tube is the simplest one-way valve. When the outer tube is lifted, air enters the air pump from the small hole in the middle sleeve at the lower end of the outer tube. Press the handle, the air will enter the inner tube of the air pump through the one-way valve at the top of the inner tube, and enter the valve of the tire along the hose!