A lubrication device, a lubrication system and a method are for applying a lubricant from a lubricating-fluid reservoir to an internal threaded portion of a pipe body. The lubrication device includes: a rotary device having: first and second coupling parts, and fluid passage for carrying the lubricant from the first coupling part to the second coupling part. The first and the second coupling parts are arranged to rotate relative to each other around an axis that coincides in the main with the longitudinal axis of the pipe body. An applicator body is connected to the second coupling part to allow rotation around the rotational axis of the rotary device. The applicator body has a fluid passage with an outlet for carrying the fluid to the applicator surface as the fluid passage in the applicator body is in fluid communication with a corresponding fluid passage in the rotary device.

A lubrication device, a lubrication system and a method are for applying a lubricant from a lubricating-fluid reservoir to an internal threaded portion of a pipe body. The lubrication device includes: a rotary device having: first and second coupling parts, and fluid passage for carrying the lubricant from the first coupling part to the second coupling part. The first and the second coupling parts are arranged to rotate relative to each other around an axis that coincides in the main with the longitudinal axis of the pipe body. An applicator body is connected to the second coupling part to allow rotation around the rotational axis of the rotary device. The applicator body has a fluid passage with an outlet for carrying the fluid to the applicator surface as the fluid passage in the applicator body is in fluid communication with a corresponding fluid passage in the rotary device.

Systems and methods for automatic maintenance of lube oil quality include a storage tank for storing fresh lube oil, a lube oil reservoir containing a volume of operational lube oil, and an oil disposal tank. A first controllable flow system transports lube oil from the reservoir to the oil disposal tank, and a second controllable flow system transports fresh lube oil from the storage tank to the reservoir. Provided are a level transmitter to measure a level of lube oil within the reservoir and an antioxidant sensor to measure a concentration of antioxidant level inside the lube oil reservoir. A control system activates and deactivates the first controllable flow system based upon the concentration of antioxidant measured by the antioxidant sensor, and activates and deactivates the second controllable flow system based upon the level of lube oil measured by the level transmitter.

An oil tank filling system for filling the oil tank of a gas turbine engine that includes an aft core cowl. The system includes an oil tank that has an oil tank top and an oil tank bottom and is located within a core of the engine, an oil access port located on the aft core cowl, and an oil tank filling pipe that leads from the oil access port to a tank filling port located at or adjacent the oil tank bottom. The system is configured so that oil that is supplied to the oil access port flows to and into the oil tank using gravitational force. A method of filling the oil tank of a gas turbine engine and a gas turbine engine that includes the oil tank filling system.

A lubricated rotational connection system provided with a free-wheel having a driving part and a driven part as well as at least one rotational link member arranged in a linking space, the linking space being located radially between a driving linking section and a driven linking section. A lubrication device comprises a fluid circulation device constrained to rotate with a driven pumping section of the driven part. The fluid circulation device is set in rotation with respect to a driving pumping section when the driving speed of rotation of the driving pumping section is lower than the driven speed of rotation of the driven pumping section about the axis of rotation in order to generate a forced circulation of the lubricating fluid within the linking space.

A negative-pressure balance system for a gearbox of a centrifugal compressor includes the gearbox, a hermetically-sealed low-level oil collecting tank and a U-shaped negative-pressure balance pipe. The gearbox is connected to a respirator, and the back pressure of the respirator is a local ambient atmospheric pressure. The bottom of the gearbox and the low-level oil collecting tank are connected by an oil conduit. An oil demister communicated with the low-level oil collecting tank is mounted at the top of the low-level oil collecting tank. The oil demister at least includes a ventilation device. The respirator is communicated with a front-end lubricating point in the gearbox. One end of the U-shaped negative-pressure balance pipe is communicated with the respirator, and the other end of the U-shaped negative-pressure balance pipe is communicated with a rear-end lubricating point in the gearbox.

A fracturing device, including a power unit, wherein the power unit comprises a muffling compartment, a turbine engine, an air intake unit, and a starter; the air intake unit is communicated with the turbine engine through an intake pipe, and configured to provide a combustion-supporting gas to the turbine engine; the air intake unit is located at the top of the muffling compartment, the muffling compartment comprises an accommodation space, the turbine engine and the starter are located in the accommodation space, and the starter is configured to start the turbine engine, the starter comprises a first electric motor.

An oil tank filling system for filling the oil tank of a gas turbine engine. The system includes an oil tank located within a core of the engine, an oil filling reservoir located within a bifurcation that extends from the core of the engine, an oil tank filling pipe that leads from the oil filling reservoir to a tank filling port on the oil tank, and an oil pump. The system is configured so that the oil pump pumps oil from the oil filling reservoir through the oil tank filling pipe and the tank filling port to fill the oil tank. A method of filling the oil tank of a gas turbine engine and a gas turbine engine that includes the oil tank filling system are also disclosed.

A device facilitating the lubrication of cable housings comprising a reservoir for liquid lubricant, a radial longitudinal slot, a cinching flap to hold the device in place and assure a secure seal, and a hole shaped to allow the use of a single device with cable housings of different types. The present invention relates to the maintenance of mechanical cable systems, especially the lubrication of bicycle cable systems.

A device facilitating the lubrication of cable housings comprising a reservoir for liquid lubricant, a radial longitudinal slot, a cinching flap to hold the device in place and assure a secure seal, and a hole shaped to allow the use of a single device with cable housings of different types. The present invention relates to the maintenance of mechanical cable systems, especially the lubrication of bicycle cable systems.