Gear-rack driving type shaftless fan

Abstract

The invention particularly relates to a gear-rack driving type shaftless fan which comprises a main engine part and a motor transmission part. The main engine part comprises a stator component, a rotor component and a lubricating device. The stator component comprises a front end cover 171, an inlet sliding bearing 161, an air barrel 4, an outlet sliding bearing 162 and a rear end cover 172. The rotor component comprises an inlet journal 151, a hub 7, an arc-shaped rack 5, blades 14 and an outlet journal 152. The lubricating device comprises oil cups 1, oil guiding pipes 2 and throttling valves 3. The motor transmission part comprises a base 28, a motor support 27, a motor 25, a motor shaft 19, a key 18, a round nut 20, a gear 21, a base front cover plate 221 and a base rear cover plate 222. According to the gear-rack driving type shaftless fan, by adopting the mode that the gear is engaged with the rack, the rotor component is driven to rotate from the rim, the flowing space occupied by a traditional fan hub disc is omitted, the working area of the blades 14 is increased, meanwhile, flowing in a runner is more uniform and reasonable, and the efficiency and noise performance are improved easily.

Description

technical field [0001] The invention relates to the technical field of fans, in particular to a rack and pinion driven shaftless fan. Background technique [0002] At present, the known fans are all driven by the central shaft to rotate the hub, and then the hub drives the blades to rotate. The existence of the hub occupies a large circulation space. Therefore, in order to ensure that the fan has a sufficient flow area when working, the blades The outer diameter of the fan is usually designed to be larger. At the same time, the increase in the outer diameter of the blade causes an increase in the linear velocity of the tip, which eventually leads to an increase in noise; there are often boundary layer separation and secondary flow at the connection between the hub and the blade of a traditional fan. The flow condition is poor, which affects the energy conversion effect and reduces the efficiency of the fan; in order to prevent the blade tip from scratching the fan duct, ther...

AI Technical Summary

Problems solved by technology

[0002] At present, the known fans are all driven by the central shaft to rotate the hub, and then the hub drives the blades to rotate. The existence of the hub occupies a large circulation space. Therefore, in order to ensure that the fan has a sufficient flow area when working, the blades The outer diameter of the fan is usually designed to be larger. At the same time, the increase in the outer diameter of the blade causes an increase in the linear velocity of the tip, which eventually leads to an increase in noise; there are often boundary layer separation and secondary flow at the connection between the hub and the blade of a traditional fan. The flow condition is poor, which affects the energy conversion effect and reduces the efficiency of the fan; in order to prevent the blade tip from scratching the fan duct, there is usually a gap of 2mm-5mm between the two, that is, the blade top gap, and the fan works At this time, the high-pressure gas on the pressure surface of the blade will bypass the tip gap and flow into the suction surface of the blade, which not only causes flow leakage and volume loss, but also destroys the stability of the flow field, which eventually leads to a decrease in the efficiency of the whole machine

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