Rotary vacuum pump
a vacuum pump and rotary technology, applied in the direction of rotary/oscillating piston pump components, machines/engines, liquid fuel engines, etc., can solve the problems of foreign matter in the clearance, rotors and rotary shafts disposed within the housing are not directly cooled, and rotors and rotary shafts may not return to their original positions
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[0021]The following will describe the multistage roots pump according to the first embodiment of the present invention with reference to FIGS. 1 to 6. The multistage roots pump will be referred to merely as roots pump hereinafter. It is noted that the left-hand side and the right-hand side of the roots pump as viewed in FIGS. 1 to 4 correspond to the front and the rear of the roots pump, respectively. It is also noted that the upper side and the lower side of the roots pump as viewed in FIGS. 1 to 4 correspond to the upper side and the lower side of the roots pump, respectively, when installed in place.
[0022]Referring to FIG. 1, the roots pump shown in its longitudinal sectional view has a pump housing indicated generally by reference numeral 1 and including a front housing 2, a rotor housing 3, a rear housing 4 and a gear housing 5 which are joined sealingly together by a plurality of bolts (not shown). As shown in FIGS. 5 and 6, the rotor housing 3 is formed by two upper and lower...
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