The high-pressure pump will be more labor-saving and safer. The principle is the same. Only the so-called high-pressure pump usually refers to the cylinder wall, piston and so on. Can withstand greater pressure and inject high pressure into inflatable objects.
The difference between high-pressure pump and low-pressure pump is that the diameter of the pump is different. If the diameter of the air pump is small, the gas pressure will be high (the same handle thrust), and the amount of compressed gas will be small at a time, but it can save labor.
High-pressure pump: In a broad sense, the pump connected with the air storage chamber is called high-pressure pump. Working principle: the air forced downward by the pipe of the air pump first enters the air storage chamber, and an air check valve is installed in the air storage chamber to store the gas entering the air chamber to form high pressure. One end of the air belt is connected to the high-pressure air storage chamber, and the other end is connected to the tire, so that people can save much effort when inflating after secondary compression.
In a narrow sense, a high-pressure pump is a pump that can pump more than 30 kilograms of air pressure. It is called high-pressure pump, which is specially used to pump up some professional equipment, such as shooting air guns.
Second, how to choose a bicycle pump
1, the concept of pump and pressure
The thicker the diameter of the cylinder (long tubular part perpendicular to the ground) of the inflator, the greater the gas output, but the smaller the pressure generated; Conversely, the smaller the inner diameter of the cylinder, the smaller the gas output, but the higher the pressure can be. The structure and principle of pumps are basically the same, and all kinds of pumps have overlapping functions. There is no absolute standard for which pump to use, depending on personal needs and usage habits.
Generally speaking, the tire pressure of road vehicles is about 90~ 100Psi under normal conditions, and it will be about110 ~120 psi during the race to increase the pedaling efficiency. The best tire pressure of mountain bikes (including BMX, cross-country and downhill) is about 45Psi; . City cars are about 60Psi; ; Car and motorcycle tires are less than 40Psi；; The shock absorber is about 230Psi, but it needs to be slightly adjusted according to the rider's weight.
2. The style and multi-performance of the pump are different.
At present, the pumps on the market can be divided into the following categories:
(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 are MIMIPUMP specially designed for road vehicles. The cylinder has a small inner diameter and a small gas volume, 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 the volume 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) Hand-held pump: The appearance is similar to MIMIPUMP, and some of them are designed to be put in the car. Because there is no special emphasis on volume, it is longer than MIMIPUMP, easier to hold and hit, and has many functions, such as air hose 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 required by 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 the most common traditional pump design, with large air volume, which is quite stable and labor-saving, but the disadvantage is its large volume. In addition, there is a pedal type, which is the easiest and most labor-saving with the foot, with low unit price but low efficiency.
3. Make choices according to personal needs.
When choosing a pump, you should consider your own needs and choose according to your own use direction, instead of blindly pursuing light, small or high pumping capacity.
Motorists who ride highways need higher tire pressure, so they need to pay attention to the tire pressure that the pump can reach when purchasing. Take the ordinary MIMI pump as an example, even if the product can meet the tire pressure required by road vehicles, it is still necessary to consider whether the arm strength is enough to cope with it. After all, the handheld MIMIPUMP is not very good, especially for female riders.
In addition, road vehicles need more accurate tire pressure, and choosing a hand-held pump with a tire pressure gauge can meet the demand. It will be more labor-saving if you can step on it, but the weight will be heavier. If the economic situation permits, high-pressure gas cylinders will be a better choice for road riders who pursue lightweight.
Mountaineers don't have the problem of high tire pressure and accurate tire pressure, so the portable MIMI pump is very easy to use.
Motorcycle tires, ball games, inflatable toys, etc. It is still easy to be used as a floor pump with large air output. MIMIPUMP, hose-less pump and road bike are available, and a floor-mounted pump should be prepared at home every day, because the hose-less pump is directly connected to the tire valve, and the joint between the valve and the inner tube is easily broken due to stress when inflating; Because of the high tire pressure, road riders have to pump up every time they ride, so a traditional floor-mounted pump with ease and labor can be used for almost all purposes except the shortcomings of carrying.
Three. Matters needing attention when purchasing bicycle pump
What details should I pay attention to when buying a pump? Generally, bicycle valves are divided into American valves and French valves, so most of the valves sold in the market are made into "smart valves" suitable for two kinds of valves, or dual-purpose valves with two holes at both ends. If the pump only has an American valve, the cyclist must prepare an adapter for the American-French valve.
The pipes of the pump are mostly plastic and aluminum alloy. The pump made of plastic pipe is light and cheap, but it is easy to deform due to the high temperature caused by friction. Aluminum alloy is still the mainstream in the market at present.
Whether it is a smart mouth or a traditional wind mouth, it will break down after a long time. The grip is also a very important factor for the pump. MIMIPUMP, in particular, must pay special attention to ergonomics. For example, some grips will get stuck on the other hand of the pump body when inflating, which will cause inconvenience in operation. Generally, the grip is folded 90 degrees, and some manufacturers have introduced the design of bilateral grip and two-way inflation. Before buying, riders must actually operate it and try to see which one is more convenient to use.