A compressor and an air conditioner including the same having an improved structure capable of decreasing a discharge temperature of the compressor. The compressor which compresses and discharges refrigerant includes a casing defining an external appearance thereof, at least one cylinder including an inner space, a rolling piston which eccentrically turns in the inner space, a vane which radially abuts the rolling piston and divides the inner space into a suction chamber and a compression chamber, and a vane chamber recessed outward of the inner space such that the vane advances and retreats, a plurality of plates disposed above and below the at least one cylinder so as to define the inner space, an injection line provided in one of the at least one cylinder and the plural plates, and a check valve installed on the injection line.

A gas pump including a first housing part (1) comprising a sealing surface (6); a second housing part (2) comprising a sealing surface (7); a delivery chamber (3) comprising an inlet (4) and an outlet (5) for a gas; and a delivery device (11, 12), which can be moved within the delivery chamber (3), for delivering the gas, wherein the housing parts (1, 2) are joined to each other such that they at least partially enclose the delivery chamber (3) over a circumference of the chamber, and such that their sealing surfaces (6, 7) abut each other in order to seal off the delivery chamber (3), and wherein a sealing recess (9) extends in at least one of the sealing surfaces (6, 7) around the delivery chamber (3) and is filled with a sealing liquid when the gas pump is in operation.

A gas pump including a first housing part (1) comprising a sealing surface (6); a second housing part (2) comprising a sealing surface (7); a delivery chamber (3) comprising an inlet (4) and an outlet (5) for a gas; and a delivery device (11, 12), which can be moved within the delivery chamber (3), for delivering the gas, wherein the housing parts (1, 2) are joined to each other such that they at least partially enclose the delivery chamber (3) over a circumference of the chamber, and such that their sealing surfaces (6, 7) abut each other in order to seal off the delivery chamber (3), and wherein a sealing recess (9) extends in at least one of the sealing surfaces (6, 7) around the delivery chamber (3) and is filled with a sealing liquid when the gas pump is in operation.

A hydraulic pump is described comprising a rotor provided for rotation about a longitudinal axis (X-X) within a housing. The pump comprises a plurality of chambers for pumping a fluid that are provided by longitudinally extending recesses in a circumferential outer surface of the rotor. During use the recesses are moved across a circumferential inner surface of the housing, and in so doing, are moved over an inlet port in the housing to draw fluid into the chamber and then over an outlet port in the housing to discharge the fluid. The hydraulic pump further comprises a roller that is mounted in a longitudinally extending pocket of the housing. The roller is positioned after the outlet port in a direction of the rotor's rotation and is arranged to follow the outer surface of the rotor and seal against each recess as it is drawn past the roller, thereby directing fluid from the chamber into the outlet port.

A vacuum pump for generating a negative pressure includes a pump housing having a pump chamber with a rotor and a motor for driving the rotor with a drive shaft rotatable about a longitudinal axis, a first and a second inlet line. The second inlet line leads through the pump housing into the pump chamber. A first outlet line leads from the pump chamber through the pump housing. The pump has a first outlet valve and a second outlet line connected to the pump housing. A connecting part is attached to a connecting surface running circumferentially to the longitudinal axis, and the outlet valve with the second outlet line is formed in the connecting part. The connecting part further has the first inlet line, with a first connecting opening formed in the connecting part housing, via which the first inlet line is connected to the second inlet line.