Multi-air-duct internal-absorption axial flow turbo fan

Abstract

The invention provides a manufacturing method of an axial flow turbo-charging fan. The axial flow turbo-charging fan is low in volume, large in air output, volute-free, multi-air-duct and ultra-low-noise, and the volume of the axial flow turbo-charging fan cannot be increased along with increase of the air output. The structural design of a multi-air-duct internal-absorption axial flow turbo fan is most obviously characterized in that: an internal space of a turbo is fully utilized; more than two layers of fan blade rings are arranged; each layer of fan blade rings is formed by ring-like distribution of angular fan blades in a tilting state, wherein the cross section of each angular fan blade is shaped like a right angle substantially; air is absorbed from the outside and bottom of the turbo in an internal-absorption mode and then discharged vertically; and over 50 percent of the quantity and effective area of the fan blades are increased. In the field of a fan-top smoke exhaust ventilator, the fan has the advantages that: a volute is not used, the volume is low, and the air output is large, so that the resonation vibration noise of a cavity of the volute cannot be generated; a large lateral air intake space is not required to be formed between the side of the fan and an outer cover; the width and depth of an upper cover of the smoke exhaust ventilator are quite small; axial flow air draft and discharge modes are kept, so that wind resistance is small, and ventilation efficiency is high; and the fan is light-weight, and materials are saved.

Description

technical field [0001] The invention relates to a volute-case-free axial-flow turbocharged fan for ventilation, in particular to a multi-channel internal suction axial-flow turbo-fan especially suitable for fan top-mounted range hoods, belonging to the electromechanical field. Background technique [0002] At present, as the most popular, high-end, and most efficient fan top-mounted range hoods on the market, the most important part of its power system, the fan, adopts a turbo fan with a volute (also known as a bellows). The high-speed rotation of the inner turbine (also known as the impeller) makes the air flow rotate in the direction of the turbine in the volute, and is discharged from the air outlet above the volute under the action of centrifugal force, and the air outside the machine is discharged from the axial side of the volute. Inhale from the circular opening with the same diameter as the turbine, so as to complete the work of sucking and exhausting oil fume. But ...

AI Technical Summary

Problems solved by technology

[0003] To sum up, if the basic structure of the traditional turbo blower is not completely changed, and the exhaust air volume is simply increased by increasing the volume of the turbine, the volume of the whole components including the upper cover of the range hood power system will inevitably increase. The result of large size and excessive weight, and the further improvement of the exhaust air volume will also be inevitably restricted by the volume of the top-mounted components. Due to the existence of the cavity part of the shell, the resonance noise generated by the friction and vibration of the high-speed airflow must have a certain degree, otherwise the required exhaust air volume will not be obtained.

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