ROTOR SHAFT SEALING STRUCTURE FOR OIL-FREE ROTARY COMPRESSOR
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United States of America Patent
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Issued Date -
Oct 2, 2008
app pub date -
Mar 31, 2008
filing date -
Mar 30, 2007
priority date (Note) -
Abandoned
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Abstract
A rotor shaft sealing structure of an oil-free rotary compressor is provided, with which is reduced a risk of occurrence of lubrication oil intrusion into the compression chamber (9) of the compressor which is liable to occur when negative pressure is produced in the compression chamber (9). The rotor shaft sealing structure is composed such that two shaft seal means (20, 30) are provided in the rotor casing (1) between the oil lubricated bearing (10, 10') and the compression chamber (9) such that an annular airspace (24) is formed between the two shaft seal means (20,31), at least one communicating hole (34,34') is provided to communicate the annular airspace (24) to the outside of the rotor casing (1), and the annular airspace (24) of the male rotor shaft (6) sealing part and the annular airspace (24) of the female rotor shaft (7) sealing part are connected by a between-rotor shaft communication passage (35).
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