Abstract: A pump (12) for generating pressure and/or negative pressure comprises a pump chamber having a high-pressure port (16) and a low-pressure port (14), and two at least two-blade rotors which are mounted in the pump chamber on two parallel shafts offset in relation to each other. The rotors roll off onto each other free of contact during rotation while forming cells with an internal compression. Provision is made for a supply of a cooling agent (21) into the pump chamber, the supply being closed-loop controlled depending on the temperature on the side of the high-pressure port (16).

Abstract: An oil separator for oil-flooded rotary vane vacuum pumps has a filter housing (10) and a plurality of filter cartridges (14) disposed therein through which the pumping medium flows. The filter cartridges (14) are each inserted through a respective opening (16) in an outer housing wall (12) of the filter housing (10) and are secured to the housing wall (12) so as to be detachable and tight with respect to media.

Abstract: The compressor has two rotors (14, 16), which are rotatably mounted in a housing (10) by means of a shaft each, the rotors (14, 16) rotating without contact with the housing. The rotors (14, 16) consist of a powder-metallurgical Al—Si alloy, and the housing (10) consists essentially of aluminum.

Abstract: The pump for generating pressure or negative pressure comprises a pump chamber (32) which has a high-pressure port and a low-pressure port. Two rotors (28, 30) having at least two blades are fitted to two parallel shafts (20, 22) in the pump chamber (32) that are offset to each other, the shafts defining an axial direction. A drive (10) is arranged on an end face of the rotors (28, 30) and a housing cover (34) is arranged on the opposite side. The housing cover (34) is configured cup-shaped and the high-pressure port (42) as well as the low-pressure port (40) are integrated in the housing cover (34). The inner wall (44) of the housing cover (34) delimits the pump chamber (32) on an end face and has two axial openings (46, 48) one each adjoining by one channel (40, 42) which is integrated in the body of the housing cover (34). The axial opening (48) for the high-pressure port, in operation of the pump, is covered by one of the rotors (28, 30) for a time to enable inner compression of the delivered medium.

Abstract: The pump for generating pressure or negative pressure comprises a pump chamber (32) which has a high-pressure port and a low-pressure port. Two rotors (28, 30) having at least two blades are fitted to two parallel shafts (20, 22) in the pump chamber (32) that are offset to each other, the shafts defining an axial direction. A drive (10) is arranged on an end face of the rotors (28, 30) and a housing cover (34) is arranged on the opposite side. The housing cover (34) is configured cup-shaped and the high-pressure port (42) as well as the low-pressure port (40) are integrated in the housing cover (34). The inner wall (44) of the housing cover (34) delimits the pump chamber (32) on an end face and has two axial openings (46, 48) one each adjoining by one channel (40, 42) which is integrated in the body of the housing cover (34).

Abstract: In order to simultaneously generate pressure and negative pressure with a single-stage pump, said pump has a pump chamber (18) that is formed in a housing and that is provided with a suction port, a pressure port and a charging port. There is a pair of rotors (30, 32) in the pump chamber (18) that has at least three blades and that rotates in opposite directions around parallel spaced axes and the rotors intermesh free of contact and, together with the peripheral wall of the pump chamber (18), they define cells (60, 62a, 62b, 64) that are separate from each other.

Abstract: In order to simultaneously generate pressure and negative pressure with a single-stage rotary piston machine, said machine has a chamber (18) that is formed in a housing and that is provided with a suction connection, a pressure port and a charging port. In the pump chamber (18), there are two three-blade rotors (30, 32) that work with internal compression and internal expansion and that rotate in opposite directions around parallel spaced axes and these rotors intermesh so as to be free of contact so that, together with the peripheral wall of the pump chamber (18), they define cells (60, 62a, 62b, 64) that are separate from each other.