Principle and structure of inflator

A pump is a tool that can inject air into an object. Its principle is to combine the exhaust valve, screw, connecting rod and piston to form a closed container with vent. With the pump, we can inject air into the object, thus improving the environment and keeping the temperature and pressure balance between gas and liquid in the object.

Principle and structure of inflator

Principle of pump

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. There is an open space between the piston and the cylinder wall of the pump, and there is a concave rubber bowl on the piston. When the piston is pulled up, the air volume below the piston increases and the pressure decreases; when the piston is pressed down, the air volume below the piston decreases and the pressure increases, so that the rubber bowl abuts against the cylinder wall to prevent the air above the piston from leaking, and the piston continues to press down. When the air pressure is enough to push open the tire valve core, compressed air enters the tire. The air outside the cylinder enters the piston from the open space at the upper end of the cylinder.

In fact, the pump is a simple one-way valve. When the pull rod is lifted, the cup installed at the lower end of the pull rod becomes shorter, and air enters the pump from the small hole in the pump cover (some of them have no hole, but enter from the larger 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 pump, and the air is pressed 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) in the rubber pipe. When the pull rod was lifted for the second time, the cup was shortened again. Just then, the small iron ball fell and blocked the small hole, so that the air in the tire was not completely injected for the first time and was pulled out.

Structure of inflator

Comprise a piston rod, a connecting rod, a screw and an exhaust valve, wherein one end of that exhaust valve is connected with a contain, and the other end is connected with an external air port as an outlet; In addition, the inflator is also equipped with pressure gauges, safety valves, pressure regulating valves and other components that meet the safety requirements to ensure the safety of operation.

Classification of pumps

1)MIMI pump: light, short and small are emphasized, so the air intake nozzle generally has no hose and tire pressure gauge, and can be placed on the frame or in a buffer bag. Although it is not easy to inflate, it is light in weight and convenient to carry, and it can be used for other vehicles except road vehicles because of its high tire pressure. Now there is MIMI specially designed for road vehicles.

Pump, the cylinder diameter is small, the gas volume is small, but it is easy to apply high pressure.

2) High-pressure gas cylinder: Because the gas cylinder is filled with nitrogen, it does not need to be knocked by hand, so it is even smaller than MIMIPUMP, which is easy to carry and inflate; But a bottle of steel cylinder can only be used once, and it can only be used for other purposes when it is used up. This is a very convenient but expensive way to inflate, and it is currently loved by many road riders who pursue timeliness and lightweight.

3) Handheld pump: Appearance and MIMI

The pump is similar, and some designs are put on the car. Because it doesn't emphasize volume, it is longer than MIMIPUMP, easier to grip and has more functions, such as hose with air nozzle and tire pressure gauge. There is also foot pedal fixed deformation, which can not only be inflated manually, but also be fixed by foot pedal like a common floor pump, increasing stability and facilitating stress.

4) High-pressure pump: The pressure of the shock absorber is much higher than that of ordinary tires, so ordinary pumps cannot be used. High-pressure pump is thin, with small gas output and high pressure, and is specially used for shock absorber.

5)

Large floor pump: this is a common traditional pump design, which has the disadvantages of large air volume, considerable stability and labor saving, and large volume. In addition, there are pedal-driven ones, which are naturally easy and labor-saving, with low unit price but low efficiency.