The invention relates to a mechanically driven coolant pump having a controllable delivery rate for a main delivery circuit from a first outlet and for a secondary delivery circuit from a second outlet of the coolant pump, said coolant pump comprising, among other things, a hydraulic control circuit which is derived from the coolant pump and has an input-side auxiliary pump, an output-side proportional valve, and a regulating slide as a hydraulic actuator for limiting the flow of the main delivery circuit, wherein a cylindrical portion of the regulating slide can be axially displaced in the pump chamber in order to radially shield the pump impeller, specifically by means of a pressure in the hydraulic control circuit counter to a restoring force. The coolant pump is characterised in particular in that a regulating valve is connected to the hydraulic control circuit as a hydraulic actuator in order to limit the flow of the secondary delivery circuit, wherein actuations of the regulating slide and of the regulating valve are associated with pressure ranges in the hydraulic control circuit.

A coolant pump for a vehicle includes an impeller mounted at one side of a shaft and configured to pump a coolant, a pulley mounted at the other side of the shaft and configured to receive torque, a pump housing including an inlet into which the coolant inflows and an outlet of which the coolant flows out, a slider disposed to be movable in a longitudinal direction of the shaft so as to selectively block or open the outlet and a driver configured to move the slider, where a passage which supplies the coolant to at least one heat exchange element is formed on the pump housing.

A coolant pump for a vehicle may include an impeller mounted at one side of a shaft and pumping a coolant, a pulley mounted at the other side of the shaft and receiving a torque, a pump housing of which an outlet for the coolant to flow out therethrough is formed thereto, an inflow portion including a first inlet and a second inlet configured for receiving coolant, a slider of which a first closing portion selectively closing or opening the outlet and a second closing portion selectively closing or opening the second inlet are formed thereto, and the slider disposed slidable along longitudinal direction of the shaft and a driver moving the slider.

An electric water pump having a motor with an axially moveable rotor unit. A rotary pump member is fixed for axial movement with the rotor unit to vary its position within a pump chamber so as to vary the flow rate through the pump chamber.

A coolant pump for an internal combustion engine. The coolant pump includes a delivery duct, a drive shaft, a coolant pump impeller arranged on the drive shaft to rotate therewith and to convey a coolant, and an adjustable control slide which controls a throughflow cross-section of an annular gap arranged between an outlet of the coolant pump impeller and the surrounding delivery duct. The control slide comprises a first pressure chamber arranged on a side of the control slide facing away from the coolant pump impeller and a second pressure chamber arranged opposite thereto. A control pump includes a control pump impeller arranged at the drive shaft to rotate therewith. A connecting duct fluidically connects the flow duct to the second pressure chamber. A pressure duct fluidically connects the flow duct outlet to the first pressure chamber. A valve opens and closes a throughflow cross-section of the pressure duct.

A centrifugal pump with adaptive pump stages includes an impeller configured to provide kinetic energy to fluid flow through the pump. The impeller has multiple geometric dimensions. The pump includes a diffuser connected to the impeller that is configured to convert the kinetic energy provided by the impeller into static pressure energy to flow the fluid through the pump. The pump includes an adaptive material attached to the impeller that is configured to modify, during operation of the pump, a geometric dimension to modify fluid flow through the pump.

A centrifugal pump with adaptive pump stages includes an impeller configured to provide kinetic energy to fluid flow through the pump. The impeller has multiple geometric dimensions. The pump includes a diffuser connected to the impeller that is configured to convert the kinetic energy provided by the impeller into static pressure energy to flow the fluid through the pump. The pump includes an adaptive material attached to the impeller that is configured to modify, during operation of the pump, a geometric dimension to modify fluid flow through the pump.

A system having a variable diameter impeller device that is operable for reducing an energy consumption of a rotating fluid or gas pump by increasing said impeller diameter as a speed of said rotating fluid or gas pump increases and decreasing said impeller diameter as the speed decreases. An extendable vane mechanism is configured to move along an elongated curved or sloping slot, said movement along said elongated curved or sloping slot is operable for increasing and decreasing a diameter of said impeller device. A spring mechanism having a first end and a second end extends and retracts to dynamically increase or decrease a diameter of the impeller device.

A water pump includes: a body portion including a housing where an inlet port and a discharge port, an impeller accommodated inside the housing and introducing or discharging the cooling water, a rotation shaft coupled to the impeller and rotating the impeller, and a cooling water flow rate control unit arranged above the impeller and operating to selectively open or close the discharge port; a cylinder portion provided above the cooling water flow rate control unit and formed therein a hydraulic space accommodating cooling water that applies pressure to the cooling water flow rate control unit; a piston located inside the hydraulic space and pressurizing the cooling water present inside the hydraulic space; a driving unit coupled to a side surface of the cylinder portion; and a lock preventing member located at an inner surface of the cylinder portion.

A centrifugal pump assembly includes an electrical drive motor (4, 6), an impeller (14) which is driven by the electrical drive motor (4, 6) as well as with at least one valve element (18) which is directly or indirectly movable along a first movement path between at least two switching positions, by the electrical drive motor (4, 6). At least a part of the valve element (18) is additionally movable along a second movement path which is different to the first movement path, between a released position, in which the valve element is distanced to at least one contact surface and a bearing position, in which the valve element bears on the at least one contact surface.