In the reciprocating piston internal
combustion engine, compressors and pumps and other machinery within the
cylinder block along the cylinder axis of the mechanical parts. Pistons are
disc-shaped, cylindrical and cylindrical three kinds of forms. In the internal
combustion engine, the engine piston
in the high temperature and high pressure gas driven by the work. In
compressors and pumps, the piston exerts pressure on the fluid in the cylinder
under external forces to cause fluid flow and increase its pressure. In the
hydraulic cylinder, the piston in the pressure of the oil under the action. The
closed end of the piston is subjected to the pressure of the working fluid and
forms a combustion chamber or compression volume with the cylinder head and
cylinder wall. The piston is fitted with a piston ring or a gum seal to prevent
fluid leakage. Engine piston
can be cast iron, forged steel, cast steel or aluminum alloy and other
materials.
The contact pressure between the piston
ring and the cylinder liner and the sliding speed are very high, so there is a
need for adequate lubrication. Leakage can damage the oil film, in today's
large diesel engine, even more so. Therefore, in order to make the diesel
engine work steadily, a good seal is very important. The sealing effect of a
group of piston rings (which are generally grouped) can be treated as a
labyrinth seal. At the interface, the side and the circumference can produce
leakage across the piston ring. The most important leak is due to thermal
deformation caused by some deformation can be automatically corrected by the
role of heat; other deformation is caused by the instability of the diesel
engine work. The small defect on the contact surface can also be corrected by
the gas to press the piston ring against its contact surface. The magnitude of
the force produced by the corrective gas depends primarily on the magnitude of
the pressure drop produced by a single piston ring in a set of piston rings.
Which in turn depends on the instantaneous leakage area between a group of
piston rings.
A variety of changes in pressure
distribution can lead to stability of the diesel engine or not. The seal of the
circumferential surface of the piston ring can be improved by pre-correcting
the shape of the piston ring. A simple tool can be used to determine the
correct shape of the piston ring by measuring the local radius of curvature.
Most of the contents of this report, due to the use of wear in the practice,
manufacturing defects, etc. may have been recognized by most people. Wear can
correct some minor defects. So enough to run is very important, the use of a
slight wear will also make the diesel engine work stabilized. Rotating the engine
piston about its axis also improves its operation.
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