In various embodiments, a catheter pump is disclosed herein. The catheter pump can include an elongated catheter body having a distal portion including an expandable cannula having an inlet and an outlet. The expandable cannula can have a delivery profile and an operational profile larger than the delivery profile. An impeller assembly can include an impeller shaft, and an impeller body can include one or more blades. The impeller blades can draw blood into the cannula when rotated. Further, an expandable support can have a mounting portion disposed on the impeller shaft distal of the impeller body and a cannula contact portion for reducing a change in tip gap due to bending of the cannula. The cannula contact portion can be disposed distal of the mounting portion.

The invention relates to a pump arrangement (1) with at least one temperature-controllable housing part, wherein at least one temperature-controllable housing part (3) comprises a first wall (27) that is in contact with the temperature-controllable medium and a second wall (28) that is at a distance from the first wall (27). The first wall (27) and the second wall (28) form a temperature control chamber (29).

The invention relates to a pump arrangement (1) with at least one temperature-controllable housing part, wherein at least one temperature-controllable housing part (3) comprises a first wall (27) that is in contact with the temperature-controllable medium and a second wall (28) that is at a distance from the first wall (27). The first wall (27) and the second wall (28) form a temperature control chamber (29).

A downhole gas separator fluid mover assembly comprising a fluid mover having an inlet and an outlet, a separation device, a separation chamber, and a flow path separator located downstream of the fluid mover. The fluid mover comprising a centrifugal pump stage with an impeller and a diffuser moves production fluid comprising a high viscosity fluid portion and a gas portion to the separation device. The separation device produces a fluid motion that separates the gas phase from the liquid phase in response to the flow rate of production fluid from the fluid mover. A portion of the high viscosity fluid passes through the gas phase discharge port in response to the over-supply of high viscosity fluid to the liquid discharge port in response to the flow rate of the production fluid through the fluid mover.

A downhole gas separator fluid mover assembly comprising a fluid mover having an inlet and an outlet, a separation device, a separation chamber, and a flow path separator located downstream of the fluid mover. The fluid mover comprising a centrifugal pump stage with an impeller and a diffuser moves production fluid comprising a high viscosity fluid portion and a gas portion to the separation device. The separation device produces a fluid motion that separates the gas phase from the liquid phase in response to the flow rate of production fluid from the fluid mover. A portion of the high viscosity fluid passes through the gas phase discharge port in response to the over-supply of high viscosity fluid to the liquid discharge port in response to the flow rate of the production fluid through the fluid mover.

The invention relates to a mechanical seal arrangement for sealing on a rotating component (21), comprising a slide ring seal (2) having a rotating slide ring (3) and a stationary slide ring (4), which define a sealing gap (5) between the sliding surfaces (3a, 4a) thereof, a recirculation conveyor (7) arranged adjacent to the rotating slide ring (3) wherein the recirculation conveyor (7) comprises a recirculation line (19) in which a cooling device (20) for cooling the recirculated fluid is arranged, a recirculation rotor (8) and a hollow cylindrical housing (9), wherein the recirculation line (19) leads to a cavity (6) in the region of the sealing gap (5) of the sliding ring seal (2), wherein the hollow cylindrical housing (9) comprises an inner shell surface (11) and an outer shell surface (12) and wherein a conveyor channel (10) is provided on the outer shell surface (12), which conveyor channel (10) is formed along the outer shell surface (12) from a start portion (13) to an end portion (14) wherein the start portion (13) of the conveyor channel (10) is separated from the end portion (14) by a separating web (15), wherein a plurality of feed openings (16) are provided in the hollow cylindrical housing (9), which open from the inner shell surface (11) into the conveyor channel (10), and wherein a single outlet opening (17) is provided at the end portion (14). (FIG. 1)

The invention relates to a mechanical seal arrangement for sealing on a rotating component (21), comprising a slide ring seal (2) having a rotating slide ring (3) and a stationary slide ring (4), which define a sealing gap (5) between the sliding surfaces (3a, 4a) thereof, a recirculation conveyor (7) arranged adjacent to the rotating slide ring (3) wherein the recirculation conveyor (7) comprises a recirculation line (19) in which a cooling device (20) for cooling the recirculated fluid is arranged, a recirculation rotor (8) and a hollow cylindrical housing (9), wherein the recirculation line (19) leads to a cavity (6) in the region of the sealing gap (5) of the sliding ring seal (2), wherein the hollow cylindrical housing (9) comprises an inner shell surface (11) and an outer shell surface (12) and wherein a conveyor channel (10) is provided on the outer shell surface (12), which conveyor channel (10) is formed along the outer shell surface (12) from a start portion (13) to an end portion (14) wherein the start portion (13) of the conveyor channel (10) is separated from the end portion (14) by a separating web (15), wherein a plurality of feed openings (16) are provided in the hollow cylindrical housing (9), which open from the inner shell surface (11) into the conveyor channel (10), and wherein a single outlet opening (17) is provided at the end portion (14). (FIG. 1)

A liquid-cooling pump and a flow channel structure thereof are disclosed. The flow channel structure includes a liquid pump mounting chamber. A bottom of the liquid pump mounting chamber is centrally formed with a liquid inlet. A peripheral side of the liquid pump mounting chamber is formed with a liquid outlet. An inner wall of the peripheral side of the liquid pump mounting chamber is convexly provided with a protruding boss corresponding to one side of the liquid outlet and surrounding an impeller, and is concavely provided with a guide groove corresponding to another side of the liquid outlet and surrounding the impeller. The protruding boss is gradually thinned along a rotating direction of the impeller. The guide groove is gradually deepened along the rotating direction of the impeller and communicates with the liquid outlet.

A liquid-cooling pump and a flow channel structure thereof are disclosed. The flow channel structure includes a liquid pump mounting chamber. A bottom of the liquid pump mounting chamber is centrally formed with a liquid inlet. A peripheral side of the liquid pump mounting chamber is formed with a liquid outlet. An inner wall of the peripheral side of the liquid pump mounting chamber is convexly provided with a protruding boss corresponding to one side of the liquid outlet and surrounding an impeller, and is concavely provided with a guide groove corresponding to another side of the liquid outlet and surrounding the impeller. The protruding boss is gradually thinned along a rotating direction of the impeller. The guide groove is gradually deepened along the rotating direction of the impeller and communicates with the liquid outlet.

A multistage centrifugal pump for conveying a fluid includes a pump housing, two first stage impellers, a last stage impeller and a shaft. The two first stage impellers and the last stage impeller convey the fluid from a housing inlet to a housing outlet. The shaft rotates each impeller about an axial direction, each impeller comprising a suction side to receive the fluid and a discharge side to discharge the fluid. The last stage impeller is a double suction impeller, having a first suction side and a second suction side, and the last stage impeller is arranged between the two first stage impellers with respect to the axial direction. Each impeller of the two first stage impellers is arranged with the suction side of a respective first stage impeller facing one of the first and second suction sides of the last stage impeller.