Hydraulic system is the use of hydrostatics in PASCAL's law, the use of oil or other liquids, the pressure in the liquid transfer, so as to achieve small pressure control of large pressure, somewhat similar to the lever principle.
The compressibility of liquid is generally very small, so in hydrostatics, liquid is considered to be incompressible; In an incompressible stationary liquid, the effect of an external force at any point will be instantly transmitted to all points of the fluid, which is PASCAL's law.
According to PASCAL's law, for the above two connected water cylinders, the pressure at any level must be equal, if the two pistons are at the same level, then the pressure of the piston is:
P1=P2;
According to the pressure formula:
F1/S1=F2/S2;
Both:
F1/F2=S1/S2=C;
It can be seen that the ratio of the pressure on the two pistons is equal to the ratio of the area of the piston, and is independent of the size of the pressure; Using this principle, we can use a smaller force to generate a larger force, and the price we pay is that the smaller force moves more, similar to the lever principle.
For example, if we take a syringe with a needle, remove the needle, and gently block the air outlet with our hand, we need to use more force to push the piston forward, which is the same principle as the hydraulic system.
In the hydraulic system, the water as the medium is called the hydraulic press, the oil as the medium is called the hydraulic press, because the pressure in the hydraulic press is very high, so the pressure difference caused by gravity can be ignored.
Hydraulic systems have applications in many places, and it is easy to achieve stepless control and high-precision control, such as one of the jacks, which uses the hydraulic principle.
Hydraulic press is a major application of hydraulic principle, can produce more than 100Mpa of ultra-high pressure, as well as hundreds of tons of pressure, is an important equipment in heavy industry production.