A compressor system for a cryocooler includes a compressor unit that includes a compressor main body compressing a refrigerant gas of the cryocooler and a liquid-cooled heat exchanger cooling, through heat exchange with a cooling liquid, at least one of the refrigerant gas compressed by the compressor main body and an oil lubricating the compressor main body, a supply line through which the cooling liquid is supplied from a main chiller to the liquid-cooled heat exchanger, a collecting line through which the cooling liquid is collected from the liquid-cooled heat exchanger to the main chiller, and a backup chiller that is provided outside the compressor unit, circulates the cooling liquid to the liquid-cooled heat exchanger in place of or together with the main chiller, and includes a circulation pump and a cooler cooling the cooling liquid on an inlet side or outlet side of the pump.

A high-capacity fluid pump comprising a dedicated lubrication system in fluid communication with the pump's drive assembly to reduce wear of internal components within the gearbox, as well as a drive shaft-supported impeller and outboard head to reduce deflection. Moreover, the blades of the outboard head are preferably shaped to decrease the inlet's cross section and stabilize incoming fluid, thereby reducing cavitation, pre-rotation, and turbulent flow at the pump inlet and increasing the overall velocity of incoming fluid.

A plain bearing (410) is fixed to a shaft hole (401) of an impeller (400) of the pump (100) so as to rotatably support the impeller (400) with respect to the shaft (300), and is restricted from moving in an axial direction by an annular restrictor (310) fixed to the shaft (300). On an end face (411) of the plain bearing (410) facing the restrictor (310), a lubrication groove (412) connecting a radially inner side and a radially outer side of the end face (411) to supply cooling water onto the end face (411) for lubrication, and a dynamic pressure generating groove (413) that introduces a flow of cooling water created by rotation of the impeller (400) to generate a dynamic pressure, are provided. The present bearing suppresses an increase in rotation torque of the impeller (400) during high speed rotation.

Embodiments are directed toward an engine. In some embodiments, the engine includes a water pump and a balancer shaft. In some embodiments, the water pump has a plain bearing. In some embodiments, plain bearing is supplied with pressurized oil. In some embodiments, the balancer shaft drives the water pump as well as cam shafts.

A subsea water injection pump includes components that are cooled and lubricated by the process fluid. The pump includes opposing stages of impellers in a “back-to-back” arrangement such that the axial forces of the impeller stages partially or nearly fully offset each other. In some cases, a combination of barrier fluid and process fluid is used for lubrication and cooling.

A turbo compressor that has a pressure equalizing tube that circulates a gas from a gear unit accommodation space toward an IGV accommodation space, and an oil separation device that is provided in the gear unit accommodation space to separate lubricating oil that is contained in the gas, in which the oil separating device has a suction duct that communicates with the pressure equalizing tube, and the suction duct has a centrifugal separation portion provided with a first demister, a second demister provided on the downstream side of the first demister in relation to the suction direction, and a curved passage provided between the first demister and the second demister.

A centrifugal pump, and components thereof, operable at high speeds, is described under the present disclosure. A hard polymer sleeve can be applied to certain surfaces of a seal casing within the pump. If the sleeve is applied along surfaces near the center shaft, then the hard polymer will withstand the forces and pressures of the system. The hard polymer might not be used along the outer diameter, farther from the shaft, because velocities are higher the further out one goes. The current disclosure allows for the use of fluoropolymer in the lining sleeve. The benefits of fluoropolymer have been unavailable in high speed centrifugal pumps because the forces are too great on the periphery of the seal casing. However, the lower speeds along the interior, near the shaft, allow fluoropolymer to be used.

Disclosed is a device for regulating the compression force of a spring-spacer assembly provided in a mechanical shaft seal in a system including a motor and a pump or compressor. The device includes a spacer made from shape memory alloy, a spring in line with the spacer, and a heater proximate the spacer. When heated, the spacer contracts in length, resulting in a decrease in compression force. Also disclosed are systems and methods utilizing the device. The device is particularly useful when starting a pump or compressor to reduce friction in the mechanical seal. Existing mechanical seals can be easily retrofitted with the device.

Disclosed is a device for regulating the compression force of a spring-spacer assembly provided in a mechanical shaft seal in a system including a motor and a pump or compressor. The device includes a spacer made from shape memory alloy, a spring in line with the spacer, and a heater proximate the spacer. When heated, the spacer contracts in length, resulting in a decrease in compression force. Also disclosed are systems and methods utilizing the device. The device is particularly useful when starting a pump or compressor to reduce friction in the mechanical seal. Existing mechanical seals can be easily retrofitted with the device.

A bearing for a pump with a shaft rotating around an axial direction includes a housing and a bearing cover fixed to the housing, a bearing structure for supporting the shaft of the pump, a reservoir for a lubricant and an oil ring for transporting the lubricant and for supplying the lubricant to the bearing structure wherein the oil ring is arranged for being moved by the rotating shaft and wherein a retaining element is provided for that is fixed with respect to the housing or the cover, the retaining element being designed and arranged such that it restricts a movement of the oil ring at least in the axial direction.