To provide a roots type fluid machine capable of reducing the leak of a gas from an axial gap.
In the roots type pump having slight axial gaps between the rotor axial end surfaces 36AB and 36BB of a pair of rotors 36 and the internal wall of a case 2 opposite to the rotor axial end surfaces 36AB and 36BB, guide grooves 50 comprising an arclike groove 50A and a radial groove 50B and communicating with a transfer chamber 40 are provided opposite to the rotors 36A and 36B on the internal wall of the case 2 to introduce a gas flowing in the axial gaps to the transfer chamber 40. A pair of the rotors 36 are also provided with communication grooves 55 extending radially from the center of the rotation shafts 8A and 8B on the rotor axial end surfaces 36AB and 36BB to enable wider range communication with the transfer chamber 40 to introduce the gas flowing in the axial gaps to the transfer chamber 40.
JP2008281003 | DRY VACUUM PUMP |
JPH01167485 | ROOT'S PUMP PROVIDED WITH MAGNETIC SEAL |
YAMAMOTO SHINYA
BAN TAKASHI
IMAI TAKAYUKI
YAMASHITA KATSUMI
HANAOKA YASUNAKA
JPS6390690A | 1988-04-21 | |||
JP2002221177A | 2002-08-09 | |||
JP2004270545A | 2004-09-30 |
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