A well production apparatus includes a down-hole gear pump and a transport assembly to which the gear pump is attached. The transport assembly is formed from a string of modular pipe assemblies having one or more passages for carrying production fluid from the bottom of the well to the surface. The passages can be arranged in a side-by-side configuration, and include pressure and return lines for driving the gear pump. The gear pump includes a hydraulically driven motor that is ganged with a positive displacement gear set. Both the motor and the pumping section have ceramic wear surfaces, the ceramic being chosen to have coefficients of thermal expansion corresponding to the coefficients of thermal expansion of the gear sets. The pumps and rotors have ceramic bushings rather than ball or journal bearings, and are operable under abrasive conditions.

Well production apparatus and method

Fluid displacement apparatus and method

Feed unit, in particular for the feeding of fuel, having an electric drive motor and a pump unit coupled to it, which comprises a base plate, an intermediate plate having a recess for rotating pump parts and a cover, at least the base plate and the cover consisting of a ceramic material and the end sides of the base plate and of the cover which face the intermediate plate having ground surfaces.

Internal gear fuel pump

A rotary engine is provided with solid vanes which extend through the rotor and engage opposing interior wall portions of the stator housing. A series of grooves in the interior wall permit the expanding exhaust gases to by-pass the minimal surface area of vanes proximate to the combustion chamber to engage the larger surface area of a vane which is protruding more significantly from the rotor. This robust rotary engine is preferably made of cast iron, having internal portions coated with ceramic so that it readily can operate at temperatures exceeding 850° F. The heat energy is utilized to obtain maximum productive work rather than being discarded as a waste product as is typical with most state of the art power plants, resulting in an efficiency rating exceeding 60%.

Gorski rotary engine

A gear pump includes a housing defining an accommodating chamber and a cover for sealing the accommodating chamber. The accommodating chamber accommodates a drive gear and a driven gear. Each of the drive gear and the driven gear includes an upper surface opposed to the cover and a lower surface opposed to the housing. An annular projection projects from the upper surface of the drive gear or the driven gear for contacting the seal plate. An annular projection projects from the lower surface of the drive gear or the driven gear for contacting the seal plate. The gear pump is capable of lowering the load when the drive gear and the driven gear are rotated.

Gear pump and liquid injection apparatus

A gear pump or motor comprising a pair of gears (3, 4) intermeshing with each other, a case body (5) accomodating said pair of gears, a hard layer (15) formed on the inner surface of said case body, said hard layer being made of a material to be as hard as not to be cut by the cog tips of said pair of gears, the cog tips of said pair of gears being wiped on said hard layer with a clearance to seal any leakage of liquid The hard layer may be a ceramic coating layer or a composite coating layer

Gear pump or motor

A gear pump or motor comprises a pair of gears intermeshing with each other, a case body accommodating the pair of gears, and a hard layer formed on an inner surface of the case body The hard layer is made of a material to be as hard as not to be cut by tooth tips of the pair of gears The hard layer may be a ceramic coating or a composite coating layer which performs a grinding like operation on the tooth tips

Masayuki Miki

Papers

Gear pump or motor

Gear pump or motor with hard layer in interior casing surface