Low-noise vacuum pump

Claim 1

A vacuum pump comprising (a) a first pump housing defining a pumping chamber; (b) a pump rotor received in the pumping chamber; (c) a drive motor operatively connected to said pump rotor and having an outer surface; (d) an oil casing receiving said first pump housing and having an outer surface; (e) a second pump housing surrounding said first pump housing and said drive motor; said second pump housing having inner wall faces and an air inlet opening; (f) a blower operatively connected to said drive motor and being arranged at a side thereof facing away from said first pump housing; said air inlet opening of said second pump housing facing said blower; (g) cooling ribs provided on said outer surfaces of said drive motor and said oil casing; said cooling ribs forming, with said inner wall faces of said second pump housing, channels for guiding cooling air drawn in through said inlet opening by said blower; and (h) a shaped component disposed about said blower and surrounded by said second pump housing; said shaped component including means for positively guiding cooling air drawn in through said inlet opening by said blower; said shaped component being of an electrically insulating material and comprising cutouts for accommodating electric components; said cutouts, together with said inner wall faces of said second pump housing, defining cavities for form-fittingly receiving and supporting electric components therein.