Abstract: In order to improve a refrigerant compressor system, comprising at least one low-pressure stage and at least one high-pressure stage, a suction duct leading from a suction connection for the refrigerant to the low-pressure stage, an intermediate-pressure duct leading from the low-pressure stage to the high-pressure stage, a high-pressure connection connected to the high-pressure stage, and a lubricant bath to which the intermediate pressure in the intermediate-pressure duct is applied, in such a way that there is always an adequate supply of lubricant for the low-pressure stage, it is proposed that a lubricant feed device draws lubricant from the lubricant reservoir and feeds said lubricant to the induced refrigerant flowing to the low-pressure stage in an intake path.

Abstract: A refrigerant compressor that includes a compressor housing enclosing an outlet chamber and an outlet passage leading from the outlet chamber to an external high pressure connection, such that the pulsations in it are damped as much as possible. The refrigerant compressor includes a pulsation damping element inserted into the outlet passage of the compressor housing following the outlet chamber. The pulsation damping element has an inlet baffle which faces the outlet chamber and extends over a cross section of the outlet passage and, located opposite to the inlet baffle is an outlet baffle which extends over the cross section of the outlet passage. At least one reflection chamber is provided between the inlet baffle and the outlet baffle. The inlet baffle and the outlet baffle each have at least one passage which faces a reflection surface on the respectively other baffle.

Abstract: A fuel pump has a housing (6), an electric motor (1) arranged in the housing (6) and is provided with a stator (7) and a rotor (8) having a shaft (9). The shaft (9) extends to the area of a pump stage (2) and passes therethrough. The pump stage (2) is configured as a G-rotor stage. The shaft (9) of the electric motor (1) has, on its periphery, at least two flattened portions (16, 17) at least in the area (10) in which the shaft (9) passes through an inner rotor (15) of the G-rotor stage (2), whilst the inner rotor (15) of the rotor stage (2) has an identically configured recess (18).

Abstract: To improve a refrigerant compressor, in particular, displacement compressor, comprising a compressor housing enclosing an outlet chamber and an outlet passage leading from the outlet chamber to an external high pressure connection, such that the pulsations in it are damped as much as possible it is suggested that a pulsation damping element be inserted into the outlet passage of the compressor housing following the outlet chamber, that the pulsation damping element have an inlet baffle which faces the outlet chamber and extends over a cross section of the outlet passage and, located opposite thereto, an outlet baffle which extends over the cross section of the outlet passage, that at least one reflection chamber be provided between the inlet baffle and the outlet baffle and that the inlet baffle and the outlet baffle each have at least one passage which faces a reflection surface on the respectively other baffle.

Abstract: The invention relates to a gerotor fuel pump (2) comprising ribs (18, 19), which are located in channels (16, 17) that are configured as inlets and outlets and that are situated in housing parts (8, 9). The ribs (18, 19) are positioned transversely to the maximal extension of the cross-sections of the channels (16, 17), producing a high degree of stability in the channels (16, 17). The housing parts (8, 9) are composed of plastic.

Abstract: In a feed pump designed as a side-channel pump, a blade chamber of an impeller has a contour which is formed by a radius and in which, as seen from the contour, the origin of the radius is located behind a center line of the blade chamber. A circulation flow thereby passes into the blade chamber with particularly low turbulences. The feed pump has particularly high efficiency as a result.

Abstract: A feed pump includes an impeller with two rings of guide blades delimiting blade chambers. The rings of guide blades concentrically surrounding one another and have different angular intervals between guide blades. The angular intervals between the guide blades of each ring vary within a range of values and ranges of values of each ring of guide blades is different to avoid the additions of noise emissions the feed pump consequently has noises which cause particularly little disturbance.

Abstract: A feed pump includes an impeller with two rings of guide blades delimiting blade chambers. The rings of guide blades concentrically surrounding one another and have different angular intervals between guide blades. The angular intervals between the guide blades of each ring vary within a range of values and ranges of values of each ring of guide blades is different to avoid the additions of noise emissions the feed pump consequently has noises which cause particularly little disturbance.