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The sealing mechanism of the gas ring

2020-12-21

The piston ring has a notch and is not a circular ring in the free state. Its outer dimension is larger than the inner diameter of the cylinder. Therefore, after it is installed in the cylinder together with the piston, it generates elastic force and clings to the cylinder wall.

The piston ring is pressed against the lower end surface of the ring groove under the action of gas pressure, so the gas flows around to the back of the ring and expands, and its pressure drops. At the same time, the force of the gas pressure on the ring back makes the piston ring more closely adhere to the cylinder wall. When the gas whose pressure has been lowered leaks from the incision of the first gas ring to the upper plane of the second gas ring, the gas ring is pressed against the lower end surface of the second ring groove. It flows around to the back of the ring and expands again, and its pressure is further reduced.

If this continues, the pressure and flow rate of the gas leaking from the last gas ring have been greatly reduced, so the amount of gas leaking is very small. Therefore, a "labyrinth" sealing device composed of a few gas rings with staggered cuts is sufficient to effectively seal the high-pressure gas in the cylinder.