Range hood

Abstract

A range hood, containing at least a fan having a housing and an impeller, an oil filter, a cover, a fume exhaust cover, a light, and a switch. The housing of the fan is a circular double-chamber or multi-chamber structure with an air inlet and an air outlet, and the impeller of the fan contains at least one group of arc-shaped blades each having a closed side and being enlarged in an axial direction.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of International Patent Application No. PCT / CN2009 / 000516 with an international filing date of May 13, 2009, designating the United States, now pending, and further claims priority benefits to Chinese Patent Application No. 200810017064.7 filed on Jun. 25, 2008, and to Chinese Patent Application No. 200820024568.7 filed on Jun. 25, 2008. The contents of all of the aforementioned applications, including any intervening amendments thereto, are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a range hood.[0004]2. Description of the Related Art[0005]Range hoods are widely used nowadays. However, there are several problems with the conventional range hoods: first, large amount of oil remains on fans thereof after long-time use, which affects oil suction and brings about large noise; second, they are low-efficient and power consuming; an...

AI Technical Summary

Benefits of technology

[0021]1. the impeller, the blade, and the housing cause gas not to be collided with the impeller or the housing, oil smoke does not pass the impeller, and thus volume loss, flow loss and power consumption are significantly reduced, and work life of the impeller is increased; on the other hand, the arc-shaped blade having a closed side is disposed in the double-chamber structure of the housing and forms a swirling flow field that quickly rotates with respect to the shaft whereby reinforcing convergence. The swirling flow field transmits gas in a manner of “driving gas via gas” instead of using a rotating impeller or a blade, and thus a new power transmission mode—a swirling flow field mode is formed. Oil is not attached to the range hood, which ensures cleaning of the impeller without disassembling, and the invention features high efficiency, low power consumption and noise, few consumables, easy production, and long work life.

[0022]2. by using the frustum-shaped oil filter, oil smoke is filtered for two times via the first oil screen and the second oil screen, and thus complete separation between oil and smoke is implemented, which significantly improves purification rate of oil and smoke, ensures cleaning in the range hood, and prevents outdoor environment pollution. The first oil screen and the second oil screen are made of soft materials that are convenient to be cleaned or replaced, which reduces maintenance cost.

[0023]3. the fume exhaust cover having three closed sides can completely cover the oil smoke and prevent it from dissipating, which improves suction efficiency, and ensures freshness of indoor air and cleaning of walls.

[0024]4. compared with the conventional range hood, the invention increases suction efficiency by above 10% and reduces power consumption by above 10%, noise thereof is ≦50 dB, suction rate of oil smoke is above 95%, purification rate of oil smoke is above 90%, and a work life thereof is three times longer than the conventional range hood. To summarize, the invention features high efficient, low power consumption and no attached oil, is cleaning and environment-friendly, and is convenient for cleaning. Technical and economic index of the invention reach the top level in the world, energy saving and emission reduction effect caused thereby is significant, and economic and social benefit is remarkable.

Problems solved by technology

However, there are several problems with the conventional range hoods: first, large amount of oil remains on fans thereof after long-time use, which affects oil suction and brings about large noise; second, they are low-efficient and power consuming; and third, their operation contaminates indoor and outdoor environment; and finally, cleaning thereof cost users a lot.

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