Local exhaust ventilator with rotating swirler

Abstract

The present invention relates to a local exhaust ventilator which has a rotating swirler to make a swirl flow for increasing exhaust efficiency by expanding an exhaust region. Disclosed is a local exhaust ventilator with a simplified structure, wherein noise due to interference of turbulence is reduced and exhaust gas is removed at a wide area. The local exhaust ventilator includes a disk-shaped swirler rotatably mounted at an exhaust tube, a wing installed at the swirler perpendicular thereto to form a swirl flow, and a driving unit installed at the exhaust tube to rotate the swirler.

Description

BACKGROUND OF THE INVENTION [0001] (a) Field of the Invention [0002] The present invention relates to an exhaust ventilator, and, in particular, to a local exhaust ventilator which has a rotating swirler to produce a swirl flow for increasing exhaust efficiency by expanding an exhaust region. [0003] (b) Description of the Related Art [0004] Generally local exhaust ventilators are utilized in homes, restaurants, and factories that generate pollutants, and, in particular, they can be used where local pollutants are produced far from a main ventilator, where the ventilator is not easily installed near the source of the pollutants, and where the pollutants are produced momentarily. [0005] However, conventional local exhaust ventilators for these purposes have some shortcomings, as follows. The capture speed necessary for the removal of the pollutants decreases rapidly along the axial direction so that the conventional local exhaust ventilators are not effective to eliminate pollutants o...

AI Technical Summary

Benefits of technology

"The present invention provides a local exhaust ventilator that reduces noise and removes exhaust gas over a larger area. It has a simplified structure, low production cost, easy installation, maintenance, and repair. The ventilator includes a disk-shaped swirler rotatably mounted at an exhaust tube, a wing installed at the swirler perpendicular thereto to form a swirl flow, and a driving unit installed at the exhaust tube to rotate the swirler. The swirler may have a linear or curved structure and may be elongated outwardly. The driving unit may have a bearing with a circular rack mounted along the top thereof, and a pinion gear may be installed at the rotation shaft of a driving motor provided external to the exhaust tube. The swirler may include an annular plate positioned near an inlet of an exhaust pipe and which rotates about the axis of the exhaust pipe, and blades placed along an outer rim of the annular plate. The swirler cover may include a top cover and a bottom cover with gaps between them. The driving unit may include a driving motor mounted inside the exhaust pipe by brackets, and a driving rod of the driving motor fixed at the center of rotation of the swirler. The swirler may be operated with the instant generation of a local contamination source, thereby enhancing energy efficiency, and a tornado-like flow is induced due to the interaction thereof with the ground surface, thereby removing the contamination source generated at the ground in an effective manner."

Problems solved by technology

The capture speed necessary for the removal of the pollutants decreases rapidly along the axial direction so that the conventional local exhaust ventilators are not effective to eliminate pollutants occurring far from the exhaust pipe, and, therefore, the exhaust pipe needs to be installed as near to the source of the pollutants as possible.

The near-installed exhaust pipe, however, can be an obstacle to a working line, and is inefficient for pollutant removal due to workers moving around near the exhaust pipe.

Such an exhaust ventilator, however, makes noises resulting from the turbulence generated by the interference between the flow being drawn and the flow being blown in the narrow area under the exhaust pipe, and raises the possibility of spreading the pollutants farther in the space by the blown flow.

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