Pump

Pump comprising:

• a rotor that is rotatable about a rotation axis and comprises a rotor hub and a rotor collar that extends from the rotor hub in the radial direction and encircles it in an undulating manner, and
• a pump housing which comprises a first axial housing component, a central annular housing component and a second axial housing component,
• wherein a pump duct is formed in the axial direction by the first and second housing components and in the radial direction by the central annular housing component and the rotor.

Pump according to claim 1, wherein the annular pump duct has a constant cross section and connects a first radially external inlet/outlet space to a second radially external inlet/outlet space, and the pump furthermore has a blocking device which is arranged between the first radially external inlet/outlet space and the second radially external inlet/outlet space and which comprises a blocking element which blocks the pump duct in the axial direction on both sides of the rotor collar.

Pump comprising:

• a rotor that is rotatable about a rotation axis and comprises a rotor hub and a rotor collar that extends from the rotor hub in the radial direction and encircles it in an undulating manner,
• a pump housing which forms an annular pump duct with the rotor, said pump duct having a constant cross section and connecting a first radially external inlet/outlet space to a second radially external inlet/outlet space,
• a blocking device which is arranged between the first radially external inlet/outlet space and the second radially external inlet/outlet space and which comprises a blocking element which blocks the pump duct in the axial direction on both sides of the rotor collar.

Pump according to claim 3, wherein the pump housing comprises a first axial housing component, a central annular housing component and a second axial housing component and the pump duct is formed in the axial direction by the first and second housing components and in the radial direction by the central annular housing component and the rotor.

Pump according to claim 2, wherein the pump housing forms a seat for the blocking element of the blocking device.

Pump according to claim 5, wherein the seat for the blocking element is formed in a chamber of the pump housing, wherein the chamber is formed in a sector of the annular pump duct and extends on both sides in the axial direction and outwards beyond the cross section of the annular pump duct in the radial direction.

Pump according to claim 1, wherein the rotor collar of the rotor that encircles the latter in an undulating manner has flat end faces in the axial end positions.

Pump according to claim 1, wherein the rotor and the pump housing are made of metal.

Pump according to claim 1, wherein at least one of the rotor and the housing are/is made of an anti-seizure alloy.

Pump according to claim 3, wherein the pump housing forms a seat for the blocking element of the blocking device.

Pump according to claim 3, wherein the rotor collar of the rotor that encircles the latter in an undulating manner has flat end faces in the axial end positions.

Pump according to claim 3, wherein the rotor and the pump housing are made of metal.

Pump according to claim 3, wherein at least one of the rotor and the housing are/is made of an anti-seizure alloy.