Structural foundation
The pressure bar is mainly composed of cylinder, piston, piston rod, sealing ring and filled gas. The cylinder is a sealed chamber filled with a certain amount of inert gas (such as nitrogen), the piston separates the cylinder into two chambers, one end of the piston rod is connected to the piston, the other end is connected to the seat and other parts that need to be adjusted. The sealing ring is used to ensure the sealing between the piston and the cylinder to prevent gas leakage.
Working process
Rise principle: When the seat needs to be raised, the user operates the control device to make the chamber below the piston communicate with the outside atmosphere. Because the external atmospheric pressure is greater than the gas pressure in the cylinder, under the action of the pressure difference, the piston moves upward, driving the piston rod to rise, thus achieving the elevation of the seat. At the same time, the gas in the chamber above the piston is compressed, and the pressure rises, but due to the tightness of the cylinder and the compressibility of the gas, the gas can withstand this pressure change without causing damage to the pressure rod.
Descent principle: When the height of the seat needs to be lowered, the operating control device makes the chamber above the piston communicate with the outside atmosphere. At this time, the gas pressure above the piston decreases, while the gas pressure in the lower chamber is relatively large. Under the action of the pressure difference, the piston moves downward, the piston rod also drops, and the seat height is reduced. In this process, the volume of gas in the chamber below the piston increases and the pressure decreases, but it still remains within the range that the pressure rod can withstand.
Height locking principle: When the seat is adjusted to the appropriate height, the control device is used to close the passage between the upper and lower chambers of the piston and the outside world, so that the gas pressure in the cylinder barrel remains stable, and the piston is locked in the current position, so as to achieve the fixed height of the seat. This takes advantage of PASCAL’s law, which states that the pressure applied to a closed liquid or gas can be transferred in all directions by the liquid or gas with constant magnitude. Because the gas in the cylinder is in a closed state, when the pressure is stabilized, the pressure on the upper and lower surfaces of the piston is equal, and the piston will remain in a fixed position, so that the seat height can be locked.
Post time: Feb-13-2025