Vacuum pump to generate a negative pressure

A vacuum pump (1) for generating a negative pressure, comprising:

• a pump housing (4) having a pump chamber (5) with a rotor (9) and a motor (3) for driving the rotor (9) by means of a drive shaft (10) rotatable about a longitudinal axis (x),
• a first and a second inlet line (40, 18), wherein the second inlet line (18) as a continuation of the first inlet line (40) leads through the pump housing (4) into the pump chamber (5),
• a first outlet line (19) leading from the pump chamber (5) through the pump housing (4),
• a first outlet valve (48),
• a second outlet line (45) adjoining the pump housing (4),
• wherein on the pump housing (4) a connecting part (6) with a connecting part housing (7) is attached to a connecting surface (17) running circumferentially to the longitudinal axis (x) and the first outlet valve (48) with the second outlet line (45) is formed in the connecting part (6),
• wherein the connecting part (6) further comprises the first inlet line (40), with a first connecting opening (20′) formed in the connecting part (6) via which the first inlet line (40) is connected to the second inlet line (18).