A bearing unit is disclosed, which includes a new labyrinth sealing device designed for use in the ventilation industry that prevents entry of contaminants therein. The sealing device according to the present disclosure provides a “contactless” sealing device, i.e. one without contacting elements (for example elastomer lips); and a bearing unit with a low frictional torque, due only to the internal geometry and the efficiency of the lubricant, but certainly without any contribution from the sealing devices. The sealing devices comprises a plurality of shields, and wherein the combination and structural orientation of these shields creates a long, narrow labyrinth L with many changes in direction, and therefore a path for external contaminants with significant head loss. Consequently, any contaminants that make into the bearing unit, passing through the entire labyrinth L, will be negligible.

According to the present invention, foreign substances, such as external dust and the like, can be prevented from being introduced into a lubricating fluid inside a bearing, so that the extension of the durability life of a motor or fan motor can be expected and once the assembly of a rotor assembly is completed, an impeller and a stator assembly can be assembled even in a non-clean room environment, thereby reducing cost and time in an assembly process, and because a sealing protrusion can block external foreign substances in a state in which the sealing protrusion is located radially inside a sleeve than the outer diameter of the sleeve, the design of a stator core can be made more freely, and it can be applied in even a case where the inner diameter of the stator core is small and the thickness of the stator core is large.

Fan modules and motors are disclosed. The fan motor includes a bearing holder having a first bearing holder end and a second bearing holder end. The bearing holder has a first section with a first diameter that is smaller than diameters of the first bearing holder end and the second bearing holder end. The motor further includes a first bearing retained by the bearing holder at the first bearing holder end, and a second bearing retained by the bearing holder at the second bearing holder end. The motor further includes a shaft retained by the first bearing and the second bearing, and a stator surrounding the first section of the bearing holder.

The invention relates to a bearing arrangement designed as a fixed/floating bearing for a rotor of a fan, having a bearing tube, a compression spring, a shaft arranged coaxially with respect to the bearing tube, and two identically formed ball bearings arranged between the bearing tube and the shaft, each ball bearing having an inner ring and an outer ring, wherein multiple different fit zones are formed axially along the bearing tube, wherein, in a first axial fit zone, one of the ball bearings as a fixed bearing is attached by its inner ring on the shaft and its outer ring is fixed with a press fit on a continuous, shoulder-free portion of the bearing tube and, in a second axial fit zone, another of the ball bearings as a floating bearing is attached by its inner ring to the shaft and its outer ring is axially displaceably arranged with a clearance fit on a continuous, shoulder-free portion of the bearing tube, wherein the compression spring is arranged in a third axial fit zone and, exerting a preload against the outer rings of the ball bearings, is positioned axially between the ball bearings and is designed to eliminate bearing play of the floating bearing.

An oil bearing structure of a fan includes a shaft seat, a rotating shaft, and an oil bearing. The shaft seat includes a boss. A middle portion of the boss defines a slot. One end of the rotating shaft is inserted into the slot. Another end of the rotating shaft is a free end. The oil bearing is sleeved on an outer periphery of the rotating shaft. An axis of the rotating shaft and an axis of the oil bearing are perpendicular to the shaft seat. An effective length of the oil bearing and the rotating shaft is 50%-70% of a length of the fan.

Provided are a bearing assembly, a bearing assembly mounting structure and an air blowing apparatus. The bearing assembly includes: a bearing sleeve including an inner assembling face, and a bearing mounted into the bearing sleeve from an axial side of the bearing sleeve and including an outer assembling face corresponding to the inner assembling face. The inner assembling face and/or the outer assembling face is provided with a supporting structure protruding toward an opposing assembling face and cooperating with the opposing assembling face in a contacting manner, and the supporting structure is symmetrically disposed in a peripheral direction of the assembling face where the supporting structure is located.

A radial fan (1) is provided with a motor (2) and a fan housing, an outer part (4) and an inner part (5) that form a spiral-like pressure chamber (D). A pressure connector (33) which forms an outlet (44) of the radial fan (1) is arranged on the outer part. The fan housing is equipped with a fan wheel (3) which is arranged on a shaft (7) connected to the motor (2), wherein an annular flow divider (8) which surrounds the fan wheel (3) is arranged adjacently to the fan wheel (3) in a radial direction. The flow divider together with the fan housing forming a diffuser (9), which transitions directly into the pressure chamber (D), about the fan wheel (3).

A device is provided that includes a heat conductive structure; a heat transfer structure for extracting heat from the heat conductive structure by means of a boundary layer; a motor for rotating the heat transfer structure relative to the heat conductive structure; and a vertical fixing mechanism for allowing the heat transfer structure to rotate above the heat conductive structure without making contact with the heat conductive structure so as to define a boundary layer between the heat conductive structure and heat transfer structure, wherein the heat transfer structure extracts heat from the heat conductive structure by means of the boundary layer, and wherein the heat conductive structure includes small geometric turbulators.

A bearing housing includes an inner housing portion centered on a central axis and an outer housing portion centered on the central axis. The inner housing portion has a first end and a second end positioned axially away from the first end. The outer housing portion has a first end and a second end positioned axially away from the first end. A disk portion connects the second end of the outer housing portion to the second end of the inner housing portion The outer housing portion includes a radially outer surface having a diameter Doh1, a radially inner surface having a diameter Doh2, and a shoulder on the first end of the outer housing portion and having a radially outer surface with a diameter Ds. Diameter Ds is smaller than the diameter Doh1 and larger than the diameter Doh2.

A fan dynamic pressure structure having a plastic frame integrally formed around an oil-containing sintered metal powder bearing includes an oil-containing sintered metal powder bearing, a plastic frame having a middle tube integrally formed around a peripheral of a bushing body of the oil-containing sintered metal powder bearing, a blade assembly having an axial shaft penetrating through a shaft hole of the oil-containing sintered metal powder bearing, the axial shaft protruding downwardly and having an annular groove, and an annular dynamic pressure piece having an insertion hole and an annular body surrounding the insertion hole. The insertion hole is engaged with the annular groove of the fan assembly, the annular body has a plurality of curved radial dynamic pressure ditches on a surface adjacent to the oil-containing sintered metal powder bearing, of the annular body.