A water pump with an impeller driven by an electrical machine comprising a housing cap and a volute with an inlet) and an outlet and a boot hosting a stator and a rotor of the electrical machine, wherein the rotor is mounted on a fixed shaft in the water pump having a bushing rotatable mounted on the shaft.

A closed impeller includes an impeller body including a plurality of blade portions, and a shroud fitted on the impeller body. The shroud is press formed into a curved shape along end portions of the blade portions. The shroud includes a plurality of protrusions protruding from a surface facing the impeller body and extending, and curved, along the end portions of the plurality of blade portions. An amount of protrusion of each of the protrusions is less than a thickness of the shroud. A brazing material is provided at least on end portions of the protrusions.

A pump front chamber automatic compensation device for improving closed impeller backflow is provided. The automatic compensation device is mounted on the inner wall surface of the pump body front chamber, extending from the inner wall surface of the pump body front chamber to the impeller front cover plate, stopping the flow of fluid from the impeller outlet to the pump front chamber. The automatic compensation device includes a spacer plate and a compensation feedback device. One end of the spacer plate extends into the pump front chamber, and the other end is connected to the automatic compensation assembly, through which the length of the spacer extension is automatically compensated. The pump front chamber automatic compensation device can prevent the fluid flowing out of the impeller outlet from entering the front chamber of the centrifugal pump, thus improving the operating efficiency and stability of the centrifugal pump.

A method of manufacturing a pump inlet housing and filter for a pump assembly, wherein the pump inlet housing and filter are monolithic, the method has the steps of: defining a pump inlet housing as a housing tubular shape with an inlet aperture boundary at a housing top end, and an outlet aperture boundary at a housing bottom end; defining a lattice filter between the inlet and outlet aperture boundaries; and performing an additive manufacturing (AM) process to additively manufacture the pump inlet housing and the lattice filter such that the lattice filter is integral with the pump inlet housing.

An electric submersible pump (ESP) seal section assembly. The assembly comprises a seal section filled with dielectric oil; a coupling body partially inserted into the seal section, and a coupling body, wherein the coupling body is substantially cylindrical and has a first outside diameter at an upper end of the coupling body, has a second outside diameter smaller than the first diameter below the first outside diameter, has a circumferential tapered shoulder between the portion of the coupling body having the first diameter and the portion of the coupling body having the second diameter; a service-less flange coupled to the seal section, wherein the service-less flange defines a circumferential opening having a circumferential tapered shoulder on an upper edge that contacts the circumferential tapered shoulder of the coupling body.

A high-lift shielded permanent magnet multistage water pump includes a pump shell, a motor assembly and an impeller. The motor assembly includes a motor barrel, a stator, a rotor and a rotor shaft. The pump shell is sleeved on an outside of motor barrel. An upper and a lower connection base for fixing the motor barrel is provided in the pump shell. A waterway cavity is formed between the pump shell and motor barrel. An upper and a lower impeller cavities are respectively formed at an upper and a lower ends of the pump shell. The lower impeller cavity, water passing cavity and upper impeller cavity are in sequential fluid communication. Both ends of the rotor shaft with an axel provided on pass through the upper and the lower connection bases respectively. The impeller is a multistage structure and mounted on the axle at both ends respectively.

To provide a rotor for electric water pumps in which a sliding bearing formed of a thermoplastic resin composition can be produced at a low cost and has superior low friction and low wear property, and an inner diameter of the sliding bearing is hardly contracted by the insert-molding. A rotor 1 used for electric water pumps has a main body 2 that supports an impeller of the pump, a sliding bearing 3 that rotatably supports a shaft, and a magnet 4 disposed to face a stator. The sliding bearing 3 is an annealing treated body of a polyphenylene sulfide resin composition. The polyphenylene sulfide resin composition contains 5-30 vol % of carbon fiber, 1-20 vol % of polytetrafluoroethylene resin and 1-30 vol % of graphite relative to the whole volume of the polyphenylene sulfide resin composition. The main body 2 is an injection-molded body disposed by insert-molding a thermoplastic resin composition, which is different from the polyphenylene sulfide resin composition, at an outer diameter side of the sliding bearing 3.

A method of manufacturing an impeller includes attaching blades to a hub. The impeller includes the blades, the hub, and a shroud. The blades each include a tip, and the shroud includes an inner surface and at least one ring extending from the inner surface. The method also includes applying a brazing compound to the tips of the blades and to the inner surface of the shroud. The method includes inserting the blades and the hub into the shroud such that the tips of the blades press against the rings. The rings and the tips of the blades form an interference fit between the rings and the tips of the blades that maintains a consistent gap between the shroud and the blades during manufacture of the impeller. A compressor including the impeller is also disclosed.

The present disclosure relates to an electric pump including a housing defining an inlet and an outlet. The electric pump includes a rotor and stator within the housing. The rotor is liquid cooled by working fluid of the pump and the stator is positioned in a dry chamber that is sealed to prevent the working fluid from entering the dry chamber. A heat exchanger is used to cool the stator. An impeller driven by the rotor draws working fluid into the housing through the inlet. The working fluid passes through the heat exchanger to draw heat from the stator before reaching the impeller. The working fluid is discharged from the housing through the outlet by the impeller.

An electric coolant pump includes a pump house, a motor connected to the pump house, and an impeller housed in the pump house and driven by the motor. The motor includes a stator and a movable unit rotatably mounted within the stator. The stator is provided with a central shaft. The movable unit includes a support body, a bearing assembly fixedly embedded in the support body, a rotor core fixed to the support body, and a plurality of permanent magnets attached to the rotor core. The bearing assembly includes at least one bearing rotatably sleeved on the central shaft. The support body is formed by an injection-molding process to wrap the bearing assembly and fixed connecting bearing assembly and the rotor core.