48results about How to "Reduce oil leakage" patented technology

An electrical fan comprising a blade module and a coil module. The blade module includes a space defined therein, and a shaft. The space has a bottom where an end portion of the shaft is embedded. The coil module includes an oil-retaining bearing, an oil-retaining ring, and a shaft sleeve. The shaft sleeve has an internal flange at a top thereof. The oil-retaining bearing is mounted inside the shaft sleeve, and the oil-retaining ring is clamped between the internal flange and the oil-retaining bearing once the shaft of the blade module has penetrated through the shaft sleeve and the oil-retaining ring of the coil module. Via the oil-retaining ring, the lubricant oil is retained in the oil-retaining bearing, thereby preventing loss and evaporation of lubricant oil.

Provided is a fluid dynamic bearing motor in which a rotor is rotatably supported by forming an oil gap between the rotor and a stator to form a fluid dynamic pressure bearing and a plurality of oil grooves are formed in a surface of the rotor or stator forming the oil gap and facing each other. The oil grooves include a first oil groove inclined at a first angle with respect to a circumferential direction, and a second oil groove extending from an end portion of the first oil groove and inclined at a second angle with respect to the circumferential direction. The first angle is formed relatively greater than the second angle.

Provided is an external-control type fan clutch device that can suppress unnecessary rotation of a cooling fan at the time of activating a rotary shaft effectively regardless of stop positions of an oil supply port and an oil recover port at a stop time of the fan. The fan clutch device includes a valve member for opening / closing an oil circulating flow passage hole provided on a side wall face of the annular oil reserving chamber, wherein opening / closing of the oil circulating flow passage hole is controlled by the valve member, wherein an oil supply chamber, that is formed of a partition wall composed of an arc-like wall and a plate-like partition wall for shielding one end of the arc-like partition wall, is provided in the annular oil reserving chamber, and the oil circulating flow passage hole and an oil recovery port are arranged in the oil supply chamber.

A method of oil flow management for a gas turbine engine includes moving oil from a tank to a compartment using a pressure pump, moving oil from the compartment to the tank using a scavenge pump, and at least temporarily increasing a rate at which oil is moved with the scavenge pump by a greater amount than a rate at which oil is moved with the pressure pump to create at least a partial vacuum to negatively pressurize the compartment to reduce oil leakage.

A seal assembly for a gas turbine engine employs a first seal forming an oil chamber around a bearing. The first seal is configured to maintain the oil chamber at a first pressure. A second seal forms a ventilating cavity around the oil chamber. The second seal is configured to maintain the ventilating cavity at a second pressure, the second pressure being less than the first pressure and less than an ambient pressure of a primary flow path in the engine. A pressure reducing device is coupled to the ventilating cavity. The pressure reducing device is configured to maintain the second pressure.

The invention provides a flange plate rapid-connecting device and an operation method thereof and belongs to the technical field of flange plate sealing and connecting of oil feeding and draining valves of transformers. The flange plate rapid-connecting device comprises a transformer oil feeding and draining pipe, an oil pipe self-sealing connector, a transformer oil feeding and draining valve flange, an oil pipe connector flange, a sealing gasket, an adjusting steel pipe, a chuck and buckles. The adjusting steel pipe is arranged coaxially outside the oil pipe self-sealing connector. A plurality of assistant member connecting holes and a plurality of threaded holes are formed in the adjusting steel pipe. The adjusting steel pipe is provided with an external threaded face. The chuck is provided with an internal threaded face which is matched and connected with the external threaded face, and a vertical face perpendicular to the internal threaded face. The multiple buckles are connected to the end of the vertical face through hinges. The flange plate rapid connecting device is safe, reliable, suitable for oil feeding and draining operations of oil outlets with all sizes of the transformers, rapid, convenient and capable of greatly shortening sealing and connecting time of flange plates of the transformers, relieving the work intensity of maintainers and improving the working efficiency, and the maintenance frequency is greatly reduced at the same time.

A combined oil ring includes an oil ring having upper and lower rails formed integrally at an outer circumferential side of the oil ring to slide on a cylinder wall; a coil expander installed at an inner circumferential side of the oil ring to force the oil ring radially outwards; and a side rail installed at an upper side of the oil ring and having no torsion along an axial direction of the oil ring.

A seal assembly for a gas turbine engine employs a first seal forming an oil chamber around a bearing. The first seal is configured to maintain the oil chamber at a first pressure. A second seal forms a ventilating cavity around the oil chamber. The second seal is configured to maintain the ventilating cavity at a second pressure, the second pressure being less than the first pressure and less than an ambient pressure of a primary flow path in the engine. A pressure reducing device is coupled to the ventilating cavity. The pressure reducing device is configured to maintain the second pressure.

The invention relates to the technical field of silicone rubber, in particular to bi-component organic silica gel and a preparation method thereof. The bi-component organic silica gel is composed of a component A and a component B. The component A is prepared from the following raw materials in parts by weight: 40-70 parts of modified hydrogen-containing silicone oil A, 20-30 parts of reinforcing resin, 10-25 parts of methyl silicone oil, 15-25 parts of filler and 0.01-0.5 part of a catalyst. The component B is prepared from the following raw materials in parts by weight: 40 to 70 parts of modified hydrogen-containing silicone oil B, 20 to 30 parts of reinforcing resin, 10 to 25 parts of methyl silicone oil, 15 to 25 parts of filler and 0.01 to 1 part of an inhibitor. Specific modified hydrogen-containing silicone oil is prepared by selecting specific raw materials, and the low-viscosity bi-component silica gel which is good in physical performance, free of oil leakage and hand sticking and ultralow in hardness (Shore C zero degree) is prepared.