Negative pressure type range hood

Abstract

The invention breaks through the design concept of the traditional range hood and relates to a negative pressure type range hood. A volute fan is not arranged in a lampblack duct, the space of a smoke exhaust duct is enlarged, and resistance of lampblack passing the smoke exhaust duct is reduced. According to the negative pressure type range hood designed with the new concept, an air inlet is changed to be a smoke exhaust negative pressure duct, and the lampblack enters a smoke collection casing through a lampblack filter screen, passes a lampblack outlet duct formed by upward air exhausting of a positive pressure air outlet and is exhausted from a lampblack outlet. The negative pressure type range hood is characterized in that the volute fan is arranged on the outer side of the smoke exhaust negative pressure duct, the positive pressure air outlet integrally connected with the volute fan is connected with the upper end of the smoke exhaust negative pressure duct by upwards forming an inclined angle, the lampblack outlet duct connected with the positive pressure air outlet and the smoke exhaust negative pressure duct is formed, and an independent air inlet of the volute fan is arranged outside an upper casing and is not connected with the negative pressure duct of the range hood.

Description

technical field [0001] The invention relates to a household range hood, in particular to a negative pressure range hood, which makes the household range hood more beautiful, quieter and more ideal in smoking effect, and is better applied in a family kitchen. Background technique [0002] Currently known working principle of various range hoods is that the volute fan is directly installed in the air duct of the range hood, and the rotation of the wind wheel in the volute generates an attractive force to discharge the oil fume through the wind wheel. [0003] Almost all side-suction and direct-suction range hoods use this method to install the volute fan. This method of installing the volute fan directly leads to a smaller air duct of the range hood, which hinders the range hood to a large extent. The air suction and exhaust are smooth, and the oil fume directly passes through the centrifugal impeller in the volute, the motor and the volute, which increases the risk of grease ...

AI Technical Summary

Problems solved by technology

[0003] Almost all side-suction and direct-suction range hoods use this method to install the volute fan. This method of installing the volute fan directly leads to a smaller air duct of the range hood, which hinders the range hood to a large extent. The air suction and exhaust are smooth, and the oil fume directly passes through the centrifugal impeller in the volute, the motor and the volute, which increases the risk of grease particles entering the interior of the motor with the operation of the wind wheel. The fan blade on the wind wheel will increase after the range hood is used for a long time. Grease will accumulate to make the wind wheel unstable, the motor operating load will increase, the temperature will rise, and the suction and discharge effect will decrease, so that the oil fume cannot be quickly sucked and discharged to the outside

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