A water pump structure and a rotor thereof are provided. The water pump structure includes a housing, a rotor, a stator, and an isolation component. The rotor is disposed in the housing. The rotor includes an impeller. The impeller has a central hole, an outer edge and at least one groove. The at least one groove is in communication with the central hole. The at least one groove extends outward from an inner edge of the central hole to the outer edge of the impeller. The stator is disposed around a periphery of the rotor. The isolation component is disposed between the rotor and the stator and configured to isolate the rotor from the stator.

An impeller includes: main vanes which are provided in a front stage section of a hub so as to connect an outer surface of the front stage section and an inner surface of a shroud, and are arranged at intervals in a circumferential direction of the hub, wherein the main vanes generate an oblique flow of crude oil; and splitter vanes which are provided in a rear stage section of the hub so as to be connected to an outer surface of the rear stage section, and are arranged at intervals in the circumferential direction, wherein the splitter vanes generate an axial flow of the crude oil.

An impeller may include a hub section, a plurality of blades, and a shroud. The hub section may be mounted on a rotatable shaft. The hub section may define a central opening for the rotatable shaft to extend therethrough and may define a plurality of holes disposed in a circular manner about the central opening. The plurality of blades may be connected to or integral with the hub section. The shroud may be connected to or integral with the hub section and the plurality of blades. The plurality of holes may be either through holes or partially drilled holes. A bottom of some or all of the partially drilled holes may be flat, conical, or rounded. Some or all of the partially drilled holes may have one or more bleed holes that may permit quenching material to flow therethrough and prevent the quenching material from stagnating therein.

An impeller spinner for a fuel pump can include a head and a shank. The head can have a base at one end and a tip at an opposite end. The shank can have a body portion nearest the head with a first diameter and a fastener portion adjacent to the body portion at an end opposite the head with a second diameter.

Impeller bearings for pumps are disclosed. An example fluid pump includes a motor, a shaft coupled to a rotor of the motor, an impeller coupled to the shaft forward of the motor, the impeller including blades to pump a fluid, a first radial bearing positioned around the shaft aft of the motor, a second radial bearing positioned around the impeller, and guide vanes extending radially from the second radial bearing upstream of the blades of the impeller.

A method for controlling a pump unit includes controlling the pump unit based on a determination of a combination of an inducer and a centrifugal pump at least on parameters of total volumetric flow rate and pressure difference over the pump unit, and controlling the pump unit based on a surface level on a suction side of the pump unit, and an NPSHaA at an inlet before the pump unit is measured, calculated or otherwise determined, and, the output power of the inducer is increased or decreased to affect a NPSHaB at the flow channel before the impeller, so that during operation of the pump unit the NPSHaB is greater than a NPSHr of the centrifugal pump.

A method for controlling a pump unit for pumping liquid or suspension includes controlling a pump unit based on a determination of a combination of an inducer and a centrifugal pump at least on parameters of a total volumetric flow rate and pressure difference over the pump unit, and controlling the pump unit based on a rheology of a fluid to be pumped so that necessary fluidization parameters of the fluid are predetermined to enable operation of the pump unit, and the rotation speed of the inducer rotor or an output power of the inducer rotor is controlled to a desired volumetric flow rate.

A water pump structure and a rotor thereof are provided. The water pump structure includes a housing, a rotor, a stator, and an isolation component. The rotor is disposed in the housing. The rotor includes an impeller. The impeller has a central hole, an outer edge and at least one groove. The at least one groove is in communication with the central hole. The at least one groove extends outward from an inner edge of the central hole to the outer edge of the impeller. The stator is disposed around a periphery of the rotor. The isolation component is disposed between the rotor and the stator and configured to isolate the rotor from the stator.

A method for controlling a pump unit includes controlling the pump unit based on a determination of a combination of an inducer and a centrifugal pump at least on parameters of total volumetric flow rate and pressure difference over the pump unit, and controlling the pump unit based on a surface level on a suction side of the pump unit, and an NPSHaA at an inlet before the pump unit is measured, calculated or otherwise determined, and, the output power of the inducer is increased or decreased to affect a NPSHaB at the flow channel before the impeller, so that during operation of the pump unit the NPSHaB is greater than a NPSHr of the centrifugal pump.

The present invention relates to a motor pump. The motor pump (MP) includes a rotor holder (200) holding a rotor (2) and an impeller (1) which is a press-molded product, and the rotor holder (200) is fixed to the impeller (1).