A pump in which an electric motor which is connected to a rotor provided with at least one pump vane is integrated into a pump casing. The electric motor is a ring motor surrounding at least a portion of a fluid flow path through the pump. A stator is arranged internally in an intermediate section of the pump casing and surrounds the rotor. The rotor, which is supported in the pump casing, is cylinder-shaped and forms an intermediate portion of the fluid flow path, and the at least one pump vane is attached internally in the rotor.

The present invention relates to kits and methods for calibrating a pump through performance of a thermal knockdown process including demagnetization of an impeller of the pump where the impeller is separate from the pump. By heat treating the impeller, a property of magnetic interaction of the pump is reduced in a repeatable manner. A kit includes a pump with impeller, a controller and an oven. The method generally involves an iterative process of testing the pump for a property related to magnetic interaction of the elements of the pump, removing the impeller from the pump, heating the impeller under controlled conditions, then placing the impeller back into the pump to repeat the test performed initially.

A method includes placing an apparatus in a subsea wellbore (102), and hydraulically connecting the apparatus with an external hydraulic fluid source (107). The apparatus of this method includes a pump (103), a motor (105), a pressure intensifier (109), and a hydraulic fluid port (110). The motor (105) is configured to drive the pump (103). The pressure intensifier (109) is configured to maintain pressure of the hydraulic fluid in the motor at a predetermined level. The hydraulic fluid port (110) is configured to provide hydraulic fluid to the pressure intensifier (109) by mating with the external hydraulic fluid source (107) when the apparatus is in a hydrocarbon producing wellbore. The apparatus is dimensioned for lowering and retrieving through the string of production tubing (112).

Water pump with an impeller driven by an electrical machine comprising a housing cap and a volute with an input and an output and a boot hosting a stator and a rotor of the electrical machine and an electronic board mounted at the side apart from the impeller and covered by the cap housing, characterized in that the stator stack is over molded with a first plastic material and at least the stator stack, the wires and pins are over molded with a second plastic material to form a cylindrical ring boot and a heat sink that seals a cylindrical opening of the boot.

The present invention relates to kits and methods for calibrating a pump through performance of a thermal knockdown process including demagnetization of an impeller of the pump where the impeller is separate from the pump. By heat treating the impeller, a property of magnetic interaction of the pump is reduced in a repeatable manner. A kit includes a pump with impeller, a controller and an oven. The method generally involves an iterative process of testing the pump for a property related to magnetic interaction of the elements of the pump, removing the impeller from the pump, heating the impeller under controlled conditions, then placing the impeller back into the pump to repeat the test performed initially.

An axial flow pump for pumping a liquid has a motor. The motor of the pump is arranged such that the liquid to be pumped flows around the motor. No elaborate rotary leadthroughs of the pump shaft through the pipe system are needed. Furthermore, the bearings of the motor are lubricated by the liquid to be pumped, thereby avoiding risky oil lubrication. As a result, the axial flow pump is suitable for use in drinking water pipelines.

An electric fluid pump may include a pump housing and an electric motor arranged therein. A rotor of the electric motor may have a rotor shaft and may be mounted in a rotatable manner in a stator body, which may have a stator embedded at least regionally therein. The pump housing may be subdivided into a dry and a wet region containing the rotor. The rotor shaft may be mounted on a bottom side in the pump housing and may be connected in terms of drive to a pump impeller on a pump-impeller side, facing away from the bottom side, of the pump housing. The pump housing may have, on the pump-impeller side, an aperture out of which the rotor shaft may project. The pump housing may have an internal first bearing collar arranged around the aperture, wherein the dry region may be located radially around the first bearing collar, and wherein an outside diameter of the first bearing collar may be less than a maximum diameter of the rotor.

A subsea oil filtration system is described that forms a closed circuit with and is mounted on or connected to a subsea rotating machine. According to some embodiments, the oil filtration system enables the removal of dirt and/or water that has entered the barrier fluid/oil system whether it comes from the Hydraulic Pressure Unit (HPU), from the umbilical or from other parts of the oil contained lubrication and/or barrier fluid systems.

An electric pump includes a first housing member, a second housing member, and a partition. The first housing member includes a first support surface and a first seal surface. The second housing member includes a second support surface and a second seal surface. The partition is directly held between the first support surface and the second support surface to form a pump chamber with the first housing member and to form a motor chamber with the second housing member. The motor chamber houses a motor that includes a stator and a rotor. The pump chamber houses an impeller. The partition supports a bearing for holding a rotation shaft coupled to the rotor and the impeller. The first seal surface and the second seal surface directly hold a seal member therebetween.

A fluid pump includes an inlet for introducing fluid into the fluid pump and an outlet for discharging the fluid from the fluid pump. A motor is included having an armature which rotates about an axis. The motor also has a stator which circumferentially surrounds the armature such that a fluid passage is defined radially between the armature and stator through which the fluid flows from the inlet to the outlet. A pumping arrangement is rotated by the armature and pumps the fluid from the inlet to the outlet. A flow impedance member extends axially in the fluid passage which impedes circumferential flow of the fluid within the fluid passage, thereby generating a pressure gradient circumferentially within the fluid passage which applies a lateral force to the armature.