초록 ▼

In Stirling engines the high pressure of the cycle requires special seals on the piston rod to prevent leakage of gas out of the high pressure cylinder into lower pressure regions such as a crankcase. A liquid oil seal is developed in a chamber around the piston rod by movement of the piston rod to

In Stirling engines the high pressure of the cycle requires special seals on the piston rod to prevent leakage of gas out of the high pressure cylinder into lower pressure regions such as a crankcase. A liquid oil seal is developed in a chamber around the piston rod by movement of the piston rod to carry oil into the chamber which is limited by an upper scraper member and a lower sealing gland. The chamber leads to a membrane operated pressure comparison valve releasing oil from the chamber when its pressure exceeds that of the gas in the high pressure cylinder. No gas need be pumped back into the high pressure chamber and thus no separation of gas and oil is necessary.

대표청구항 ▼

Sealing means for preventing gas leakage out of a high pressure chamber in a path around a rectilinearly reciprocating piston rod into a lower pressure region comprising in combination means for conveying into a groove surrounding said rod in the lower pressure region oil forming a film of oil on sa

Sealing means for preventing gas leakage out of a high pressure chamber in a path around a rectilinearly reciprocating piston rod into a lower pressure region comprising in combination means for conveying into a groove surrounding said rod in the lower pressure region oil forming a film of oil on said rod, a sealing gland about the rod in a low pressure region between said groove and the high pressure chamber, means for scraping the oil from said rod, a reservoir accumulating a store of oil scraped from the film of oil carried by the rod from the lower pressure groove in the direction toward the higher pressure chamber, said oil reservoir having a groove positioned about said rod in a position between said high pressure chamber and said sealing gland, an outlet path to remove oil from said reservoir, and a pressure responsive valve controlling said outlet path by monitoring respecting pressures of said high pressure chamber and said oil reservoir to release oil from said reservoir chamber when the reservoir pressure exceeds that of the high pressure chamber, whereby the liquid oil in said reservoir seals said gas leakage path around the piston rod.