Pompe à vide sèche complexe dotée de rotors à vis et de type Roots- Brevets EP1882856 (A1)

Pompe à vide sèche complexe dotée de rotors à vis et de type Roots

N° de brevet:	EP1882856 (A1)
Date de publication:	2008-01-30
Inventeur(s):	HWANG TAE KYONG [KR];NOH MYUNG KEUN [KR];OH HEAUNG SHIG [KR];
Demandeur(s):	LOT VACUUM CO LTD [KR];
Classification:	F04C18/08;F04C18/12;F04C18/16;F04C23/00;
N° de demande:	EP20070252967 20070727
Numéro(s) de priorité:	KR20060071730 20060728;KR20060096281 20060929;KR20060113370 20061116

A complex dry vacuum pump including a root rotor and a screw rotor, comprising: a housing having an interior receiving space, an suction opening at one side of the housing, and a discharge opening at another side of the housing; first and second root rotors (31,32) which are located in the interior receiving space of the housing and are installed in such a manner as to be engaged with each other; first and second screw rotors (41,42) which are received in the interior receiving space of the housing and are installed in such a manner as to be engaged with each other adjacent to the first and second root rotors; first and second power transmission shafts extending through each center of the first and second root rotors and the first and second screw rotors; and a motor which is able to rotate the first and second power transmission shafts; wherein the first and second root rotors include three lobes (31a,31b,31c).