| 摘要 |
PURPOSE:To reduce the mechanical loss and the thermal loss by sealing the fluid which is same as or different from hydraulic liquid into the inside of a compression or an expansion piston which is always kept in high or low temperature, by use of a valve equipped with a piston element built-in. CONSTITUTION:A piston element 43 is fixed onto the flange part 42 of a piston cap 40 made of thin ceramic or heat-resisting alloy, by use of bolts. Onto said piston element 43, a valve 45 for sealing hydraulic liquid into a cap 50, and a small hole 49 for fixing a piston rod are provided. Said cap 50 is filled with composite plates each consisting of heat insulating material 55 and a thin metal plate 54 having a number of small holes, and thus the heat transnfer from a piston head 53 reaching high temperature to the piston element 43 staying at normal temperature due to heat radiation and convection can be obstructed. Therefore, the internal and the external pressures are balanced with each other and the cap 40 is made thin and lightweighted thus the mechanical loss can be reduced. Further, the thermal loss can be suppressed to the minimum, because of a heat insulating structure, thus the thermal efficiency of a gas engine can be increased. |
