A fuel pump assembly for a gas turbine engine includes a shaft for transmitting motion, a gear connected to and coaxial with the shaft with the gear having a first wear surface, a first bearing coaxial with the shaft with the first bearing being configured to support the gear and having a second wear surface positioned to interact with the first wear surface, and a plurality of indents. The indents are distributed in the first wear surface or the second wear surface and at least two of the plurality of indents are partially aligned in a radial direction.

A rotary compressor is provided that may include a rotational shaft, first and second bearings configured to support the rotational shaft in a radial direction, a cylinder disposed between the first and second bearings to form a compression space, a rotor disposed in the compression space to form a contact point forming a predetermined gap with the cylinder and coupled to the rotational shaft to compress a refrigerant as the rotor rotates, and at least one vane slidably inserted into the rotor, the at least one each vane coming into contact with an inner peripheral surface of the cylinder to separate the compression space into a plurality of regions. The at least one vane may include a pin that extends upward or downward, and a lower surface of the first bearing or an upper surface of the second bearing may include a rail groove into which the pin may be inserted.

An oil-free scroll air compressor, includes two fixed scrolls and a movable scroll with scroll wraps on both sides. The fixed scrolls each are provided on an end surface thereof with scroll wraps. The movable scroll with scroll wraps on both sides is provided on both end surfaces thereof with scroll wraps. The two fixed scrolls and the movable scroll with scroll wraps on both sides together form two gas compression channels located on two sides. The scroll warps on a same end surface are configured as a double-parallel-groove structure, which further divides the gas compression channel on the same side into two gas compression channels, thereby increasing displacement of the scroll air compressor. After a gas is introduced through a gas inlet on a circumferential surface of the fixed scroll, the gas is compressed in multiple compression channels and then discharged from a center of the scroll air compressor.

A scroll compressor includes a first scroll member, a second scroll member, and an aerostatic thrust bearing. The aerostatic thrust bearing forms a layer of gas between the second scroll member and a fixed supporting member to support the second scroll member as the second scroll member rotates and/or orbits. Also disclosed is a method of supporting a rotating/orbiting scroll member in a scroll compressor. The method including supplying pressurized gas to an aerostatic thrust bearing such that a layer of gas is formed between the rotating/orbiting scroll member and a fixed supporting member.

A distillation apparatus is disclosed herein. The distillation apparatus comprises an evaporation chamber, a heat source arranged to provide heat to the evaporation chamber, one or more condensing chambers located at least partially inside the evaporation chamber, a fluid inlet connected to the evaporation chamber, one or more fluid outlets attached to the one or more condensing chambers and a vapour compressor pump. Also disclosed is a liquid ring pump suitable for use with such a distillation apparatus, the pump comprising a pump body, a pump compression chamber provided within the pump body, a rotor mounted within the compression chamber, a rotor axle to mount said rotor, the rotor being provided with one or more ceramic bearings to mount it to the rotor axle.

A rotary compressor of an embodiment has a rotating shaft, an electric motor, a compression mechanism, a balancer, and a balancer cover. The compression mechanism has a cylinder, a main bearing, and a sub-bearing. The balancer is provided on the rotating shaft on a second side of the sub-bearing in an axial direction thereof. The balancer cover covers the balancer. A lubricating oil supply path that opens on a second side end face in the axial direction is provided in the rotating shaft. A supply hole that allows the supply path to communicate with the outside of the balancer cover is formed in the balancer cover at a position facing the supply path in the axial direction. A seal mechanism that seals between the balancer cover and the rotating shaft is provided between the balancer cover and the rotating shaft while allowing relative movement between the balancer cover and the rotating shaft in the axial direction.

A rotary compressor may include a cylinder having an inner peripheral surface defined in an annular shape to define a compression space, and a suction port that extends in a lateral direction to communicate with the compression space and through which refrigerant is suctioned into the compression space; a roller rotatably provided in the compression space of the cylinder, and having a plurality of vane slots that provides a back pressure at one side thereinside provided at a predetermined interval along an outer peripheral surface of the roller; a plurality of vanes slidably inserted into the plurality of vane slots, respectively, to rotate together with the roller, front end surfaces of which come into contact with the inner peripheral surface of the cylinder due to the back pressure to partition the compression space into a plurality of compression chambers; and a main bearing and a sub bearing provided at ends of the cylinder and in contact with surfaces of the plurality of vanes, respectively, and spaced apart from each other to define surfaces of the compression space, respectively. At least one surface of the vane in contact with the main bearing and the sub bearing may be a curved surface having a predetermined curvature.

The present invention relates to a Moineau pump-type quantitative liquid-discharging apparatus including a stator in which a slot hole is formed, a main shaft including a first shaft part and a second shaft part, which are eccentric with respect to each other, and a rotor which extends from the first shaft part and is inserted into the slot hole, first and second slide bearings to which the first shaft part and the second shaft part are rotatably coupled, respectively, and first and second sliders which guide the first and second slide bearings to move in directions to cross each other, wherein the movement directions of the first and second slide bearings are perpendicular to an extension direction of the rotor.

An improved screw-spindle pump, particularly for cooling systems, includes a first screw, a second screw and a pump housing, inside which the first screw and the second screw are rotatably housed between the first screw, the second screw and the pump housing, being defined pumping chambers adapted to move, as a consequence of the rotation of the first screw and the second screw, a fluid from a suction area to a delivery area of the pump.

The pump housing housing the first screw and the second screw is made in one piece.

A gerotor pump includes an inner gerotor, a wobble cancellation element, and an outer gerotor disposed radially between the inner gerotor and the wobble cancellation element. The inner gerotor includes a first outer peripheral surface with n first lobes equally spaced from one another in a circumferential direction, and n first depressions, each disposed between an adjacent pair of first lobes. The inner gerotor and the wobble cancellation element are coaxial. The wobble cancellation element includes a first inner peripheral surface with n+1 second lobes equally spaced from one another in the circumferential direction, and n+1 arcuate surfaces, each arranged between an adjacent pair of second lobes. The outer gerotor includes a second outer peripheral surface including n+1 outer depressions complementary to and arranged to engage the second lobes, and a second inner peripheral surface comprising n+1 inner depressions complementary to and arranged to engage the first lobes.