Cylinder sealing principle

The seal of the device is to prevent the leakage of the material medium and the entry of the dust and small particles in the surrounding environment, prevent the damage of the components and reduce the service life.

1. Sealing principle of piston rod: the purpose is to prevent or limit the air flow into the atmosphere or isolation chamber. Each set of sealing ring is installed in a separate packing box. Each sealing ring is tightly clamped on the piston rod to achieve the sealing effect.

In addition to sealing the stuffing box of the cylinder, there is an oil scraper ring on the piston rod, which can prevent the oil from escaping from the crankcase along the piston rod.

2. Sealing principle of piston ring: its function is to seal the gas and heat conduction after fuel explosion. The sealing is realized by the tangential elastic force of the piston ring. The piston ring is elliptical in the free state and is round in the working state. This creates elasticity. There are many kinds of oil rings. The combination oil ring is the function of the spring, which is supported by the lining ring after the combination of the scraper and the lining ring.

The sealing principle of piston ring is throttling and blocking. The outer diameter of the ring and the cylinder wall are blocked, and the end face of the ring and the ring groove are throttled by the gas, which together play a sealing role.

3. O-ring principle: O-ring is a common static seal ring, which is simple in structure, convenient in installation, light in weight, good in sealing performance, cheap in price and short in service life. It needs frequent inspection and replacement.