Vacuum exhausting apparatus
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United States of America Patent
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May 30, 2006
Grant Date -
Aug 28, 2003
app pub date -
Feb 28, 2003
filing date -
Feb 28, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a screw type vacuum pump which includes a housing provided with a rotor chamber, a pair of screw rotors in mesh with each other rotably provided in the rotor chamber, a transfer chamber of gas formed between an inner wall of the housing and flutes of the aforesaid pair of screw rotors, and a suction port and an exhaust port communicated to the transfer chamber, the gas being sucked from the suction port into the transfer chamber and exhausted from the exhaust port, by providing the aforesaid exhaust port in a side face of the housing, it is possible to form a larger exhaust port, and a time until the port is blocked with deposits can be prolonged.
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