Medical, in particular dental-medical, fan

Medical fan for extracting or compressing a gaseous working fluid, comprising:

• a) a compressor unit with an outer housing, which comprises an inlet opening for the working fluid and an outlet opening for the working fluid, which are fluidically connected to one another, and which defines a compressor sector and a drive sector;
• b) a fan unit with a radial impeller in a spiral housing, which is kept in the compressor sector and by which working fluid can be fed from the inlet opening to the outlet opening, wherein the axis of rotation of the radial impeller defines the longitudinal axis and an axial direction of the compressor unit, wherein the fan unit comprises a cooling system, for which
• a) a first drive absorption space is formed as a through-flow space and a first compressor absorption space is formed as a closed space;
• or
• the first drive absorption space is formed as a closed space and the first compressor absorption space is formed as a through-flow space;
• or
• the first drive absorption space and the first compressor absorption space are formed as a through-flow space;
• b) the through-flow space is connected to an inflow connection and an outflow connection, which for their part are connected to an inflow line and an outflow line to a cooling circuit, in which the liquid flowing through the through-flow space provides a cooling liquid, wherein the inlet opening is connected to an intake line and in that the cooling system comprises a heat exchanger which is connected to the intake line and the outflow line of the cooling circuit in such a way that the heat exchanger is flowed through by the working fluid and the cooling liquid in such a way that heat is transferred from the cooling liquid to the working fluid and the cooling liquid is cooled;
• c) an electric motor which is kept in the drive sector and by which the radial impeller can be driven;
• d) a soundproofing absorption system;
• wherein:
• e) the soundproofing absorption system in the compressor sector defines a first and a second compressor absorption space, which at least partially surround the spiral housing in the radial direction, wherein, in the radial direction, in the first compressor absorption space there is a first liquid volume of a first liquid and in the second compressor absorption space there is a solid absorber;
• f) the soundproofing absorption system in the drive sector defines a first and a second drive absorption space, which at least partially surround the electric motor in the radial direction, wherein, in the radial direction, in the first drive absorption space there is a second liquid volume of a second liquid and in the second drive absorption space there is a solid absorbing layer.