Rotors formed by an additive manufacturing process are presented. In one example, a method of making a rotor is presented including defining a printing order for the application of a first material, and creating a plurality of lobes arranged helically about a central opening or a shaft by adding a first material in the printing order, wherein each of the plurality of lobes defines an outer surface.

Rotors formed by an additive manufacturing process are presented. In one example, a method of making a rotor is presented including defining a printing order for the application of a first material, and creating a plurality of lobes arranged helically about a central opening or a shaft by adding a first material in the printing order, wherein each of the plurality of lobes defines an outer surface.

Corrosion due to salt water, or the like, is prevented or suppressed between fastening end portions of housing members, while minimizing increase in production cost with respect to corrosion. A housing 10 of a compressor 1 has a front housing 11, a center housing 12, and a rear housing 13. The front housing 11 and the center housing 12 are fastened to each other by a plurality of fastening members 31, and mutual fastening end portions (111 and 121) thereof are welded together. The center housing 12 and the rear housing 13 are fastened to each other by a plurality of fastening members 32, and mutual fastening end portions (122 and 131) thereof are welded together. A weld bead W1 is formed between the fastening end portion 111 and the fastening end portion 121, and a weld bead W2 is formed between the fastening end portion 122 and the fastening end portion 131.

A seal includes an outer housing and a seal bag internal to the outer housing. The outer housing can be positioned between a pump and an electric motor of an electric submersible pump. The seal bag can include an outer layer and an inner layer. The outer layer can be made from a first material to retain a structure of the outer layer in a swellable state in a wellbore. The inner layer can be made from a second material that is swellable in the wellbore in response to contact with a polar substance to seal a tear in the outer layer.

Rotors formed by an additive manufacturing process are presented. In one example, a method of making a rotor is presented including defining a printing order for the application of a first material, and creating a plurality of lobes arranged helically about a central opening or a shaft by adding a first material in the printing order, wherein each of the plurality of lobes defines an outer surface.

A water pump with a pump body, a chamber defined inside the pump body, and a rotor rotatable inside the chamber around a rotation axis with a plurality of vanes movable along respective radial directions. A tilting stator is arranged inside the chamber in an eccentric position with respect to the rotor. The tilting stator is pivoted at a rotation pin. A ring is interposed between the tilting stator and the rotor and is in contact with a radially inner surface of the tilting stator and with radially outer ends of the vanes. Adjusting members for adjusting the pump displacement are active on the tilting stator to move the tilting stator with respect to the rotor and place the tilting stator in at least one predetermined operating position defined between a maximum eccentricity position and a minimum eccentricity position.

A water pump with a stator, a chamber defined inside the stator, a ring arranged inside said chamber having a radially outer surface in contact with a radially inner surface of the stator, and a rotor arranged inside the ring and rotatable around a rotation axis. The rotor has a plurality of vanes movable along respective radial directions and having respective radially outer ends in contact with a radially inner surface of the ring. The ring is made of a material having a friction coefficient lower than friction coefficient of metal materials.

A vane assembly for use in a rotary vane actuator, the vane assembly comprising: a rotatable vane having a first side and a second side; a vane axle connected to the rotatable vane for converting pressure exerted on the rotatable vane into rotational motion; a vane seal on the first side of the rotatable vane, the vane seal being for sealing the rotatable vane; and a side-plate on the first side of the rotatable vane, the side-plate clamping the vane seal in position; wherein the side-plate comprises: an outer part providing an outer surface of the side-plate, the outer part defining an internal volume; and an inner part filling or substantially filling the internal volume defined by the outer part, the inner part being distinct from the outer part.

A vane assembly for use in a rotary vane actuator, the vane assembly comprising: a rotatable vane having a first side and a second side; a vane axle connected to the rotatable vane for converting pressure exerted on the rotatable vane into rotational motion; a vane seal on the first side of the rotatable vane, the vane seal being for sealing the rotatable vane; and a side-plate on the first side of the rotatable vane, the side-plate clamping the vane seal in position; wherein the side-plate comprises: an outer part providing an outer surface of the side-plate, the outer part defining an internal volume; and an inner part filling or substantially filling the internal volume defined by the outer part, the inner part being distinct from the outer part.

A seal includes an outer housing and a seal bag internal to the outer housing. The outer housing can be positioned between a pump and an electric motor of an electric submersible pump. The seal bag can include an outer layer and an inner layer. The outer layer can be made from a first material to retain a structure of the outer layer in a swellable state in a wellbore. The inner layer can be made from a second material that is swellable in the wellbore in response to contact with a polar substance to seal a tear in the outer layer.