A compressor having a compressor wall that has an interior surface that defines a compression chamber, in which a rotor or pair of rotors operates to compress a fluid. To do so, the rotors are in operative communication with the interior surface. The compressor also includes an injection port in the compressor wall and opening into the compression chamber, the injection port being in fluidic communication with a second fluid. The compressor can also include an insert in operative communication with the injection port, wherein the insert and the injection port define therebetween a gap through which the second fluid enters the compression chamber.

A compressor having a compressor wall that has an interior surface that defines a compression chamber, in which a rotor or pair of rotors operates to compress a fluid. To do so, the rotors are in operative communication with the interior surface. The compressor also includes an injection port in the compressor wall and opening into the compression chamber, the injection port being in fluidic communication with a second fluid. The compressor can also include an insert in operative communication with the injection port, wherein the insert and the injection port define therebetween a gap through which the second fluid enters the compression chamber.

A hydraulic tool includes a stator, a rotor, and a removable coating. At least one of the stator and the rotor comprises a resilient material. The removable coating has a thickness selected to compensate for expected swelling of the resilient material or an expected contraction of a clearance between the rotor and the stator based on thermal expansion. The removable coating is disposed on a surface of at least one of the rotor and the stator, and the removable coating is formulated to be removed during operation of the hydraulic tool. A method of operating a hydraulic tool includes passing a fluid through the hydraulic tool during rotation of the rotor within the stator and removing at least a portion of the removable coating responsive to rotation of the rotor within the stator as a volume of the resilient material increases responsive to contact with the fluid passing through the hydraulic fluid.

A compressor includes a bore, a rotor disposed within the bore, a compressor inlet, and a compressor outlet. The compressor further includes a compression chamber defined between the bore and the rotor, wherein a volume of the compression chamber gradually reduces from the compressor inlet to the compressor outlet. The compressor includes an economizer. The economizer is fluidically connected to the compression chamber. The economizer is configured to inject a working fluid into the compression chamber at an injection position. The injection position is changeable according to a working condition of the compressor.

A compressor includes a bore, a rotor disposed within the bore, a compressor inlet, and a compressor outlet. The compressor further includes a compression chamber defined between the bore and the rotor, wherein a volume of the compression chamber gradually reduces from the compressor inlet to the compressor outlet. The compressor includes an economizer. The economizer is fluidically connected to the compression chamber. The economizer is configured to inject a working fluid into the compression chamber at an injection position. The injection position is changeable according to a working condition of the compressor.

A submersible multi-stage labyrinth-screw pump, having a rotor shaft; an end seal for the rotor shaft; an axial unloading unit integrated into the end seal of the rotor shaft; a lower radial bearing; a longitudinal channel, which connects a high-pressure zone at an exit for the rotor and the chamber of the axial unloading unit of the shaft, the axial unloading unit comprising a thrust block with a wear-resistant insert, a thrust collar, mated with a segment of the end seal, the end seal housing, a spring, a thrust ring, and a seat sleeve of the end seal, wherein the end seal of the rotor shaft's axial unloading unit operates as follows, when high pressure appears in the chamber of the rotor shaft's axial unloading unit, the fluid is kept from unproductive flows by hermetic contact of the ground insert of a segment and a seat of the end seal.

A submersible multi-stage labyrinth-screw pump, having a rotor shaft; an end seal for the rotor shaft; an axial unloading unit integrated into the end seal of the rotor shaft; a lower radial bearing; a longitudinal channel, which connects a high-pressure zone at an exit for the rotor and the chamber of the axial unloading unit of the shaft, the axial unloading unit comprising a thrust block with a wear-resistant insert, a thrust collar, mated with a segment of the end seal, the end seal housing, a spring, a thrust ring, and a seat sleeve of the end seal, wherein the end seal of the rotor shaft's axial unloading unit operates as follows, when high pressure appears in the chamber of the rotor shaft's axial unloading unit, the fluid is kept from unproductive flows by hermetic contact of the ground insert of a segment and a seat of the end seal.

A method and apparatus to increase the labyrinth screw pump life, achieved by a decrease in axial forces in thrust tribo-couplings by creating a chamber into which high pressure at the exit from the stage is transmitted through the additional holes of the rotor, thereby creating an opposite axial force, which reduces the contact pressure on the friction surface of the thrust bearing.

A method and apparatus to increase the labyrinth screw pump life, achieved by a decrease in axial forces in thrust tribo-couplings by creating a chamber into which high pressure at the exit from the stage is transmitted through the additional holes of the rotor, thereby creating an opposite axial force, which reduces the contact pressure on the friction surface of the thrust bearing.

A system for cryocooling an optical sensor on a satellite to a temperature below 200K with minimal vibration comprising a miniature conical rotary screw compressor comprising an inner element configured to only rotate around a first stationary axis and an outer element configured to only rotate around a second stationary axis so that both elements revolve with minimal vibration; with at least one of a) a length of at least one of the inner element and the outer element is between 10 mm and 50 mm; b) a diameter of at least one of the inner element and the outer element is between 2 mm and 25 mm; c) a compression ratio of the rotary screw compressor is between 1:2 and 1:20; and d) a shaft speed of the conical rotary screw compressor is between 6001 and 20000 revolutions per minute.