There is provided a blood pump. An exemplary blood pump comprises an impeller with a rotational axis in a pump housing. The exemplary blood pump also comprises a first element that comprises a Lomakin bearing, and a second element physically separated from the first element, the second element comprising a radial magnetic bearing.

A vertical shaft with a slide bearing for a turbine or generator. The invention relates to a vertical shaft (1) with a hydrodynamic slide bearing (2) comprising the following features or components: an annular fixed bearing housing (3) which surrounds the shaft (1); a plurality of bearing segments (4) which are fixed components of the bearing housing (3), surround and support the shaft (1) and form a bearing gap (5) therewith; the shaft (1) has a radially inner oil trough (1.2) and radially outer oil trough (1.3) communicating therewith; an oil lubrication system in which the oil flows through the following components: the bearing housing (3); a first connection line from the bearing housing (3) to the inner oil trough (1.2); an overflow channel (1.4) from the upper end of the radially inner oil trough (1.2) to the upper end of the radially outer oil trough (1.3); bores (7) from the radially outer oil trough (1.3) to the bearing housing (3); and a cooling device (10) with connections to the bearing housing (3). The invention is characterised by the following features: a scoop shovel is provided, which is a component of the guide pipe; the guide pipe (9) is a component of a conducting connection between the bores (7) and the cooling device (10).

A method is described for operating a refrigerant circuit that includes a compressor with a driveshaft and one or more gas bearings for supporting the driveshaft. The method includes operating the refrigerant circuit in a first mode which includes supplying gaseous working fluid compressed by the compressor to the one or more gas bearings of the compressor, and the one or more gas bearings using the compressed gaseous working fluid to support the driveshaft. The method includes operating the refrigerant circuit in a second mode which includes supplying liquid working fluid to the one or more gas bearings of the compressor, and the one or more gas bearings using the liquid working fluid to support the driveshaft. A refrigerant circuit includes a compressor, a condenser, an expander, an evaporator, and a controller configured to selectively operate the refrigerant circuit in a least a first mode and a second mode.