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Gas sealing mechanism
Jan 06, 2017

The fundamental way to prevent gas leakage in the cylinder is to reduce the leakage path as much as possible to increase the leakage resistance. To this end, a piston ring (gas ring) by the circumferential surface and the cylinder wall close fit to form the so-called first sealing surface (Figure 10-43, I), two to rely on one side of the ring and the ring groove And the side faces are closely fitted to form a so-called second sealing surface (I in the figure).

In this case, the in-cylinder gas can only pass through a labyrinthine passage and can only be leaked through a small opening of Δ d · Sw at the piston ring cut-out (where Δd is the ring of the piston The gap between the shore and the cylinder, and Sw is the piston ring in the cylinder in the end of the gap, the hot state △ d and Sw are very small.) As a piston with 2-3 air ring, it is tandem 2- 3 throttle, equivalent path area is even smaller. If the first sealing surface is not closed, or if there is no airtight sealing surface (Figure 10-43 (b)), then the air and air leaks along the entire annulus of the piston and the cylinder wall, so that there is no large amount of air leakage Address on the more.


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