Taste-return prevention range hood

Abstract

The invention provides a taste-return prevention range hood which comprises a range hood body, wherein the range hood body is provided with an air inlet channel and an air outlet channel, wherein the air outlet channel is provided with a valve block rotating round a fixed rotation shaft; a magnetic body is arranged at one end of the valve block; and a magnetic component with variable magnetic pole direction or magnetic force corresponding to the magnetic body is arranged in the air outlet channel. According to the taste-return prevention range hood provided by the invention, the magnetic body is arranged on the valve block, and the forced opening and sealing of the valve block and the air outlet channel are realized under the effect of a magnet corresponding to the magnetic body and a stepping motor with an iron core coil or magnet or a traction magnet by use of the attractive force of the magnetic body on the magnetic material or opposite magnetic body or the repulsive force of the magnetic body against the same pole and through the attractive force and repulsive force generated by converting the relative positions of the magnetic poles; and the shortcomings that the existing check valve of the existing range hood is sealed by use of the weight of the valve block or sealed through a spring and consequently the sealing is not tight and easily causes taste return and the check valve can not be opened due to the sticky oil of the smoke are overcome.

Description

technical field [0001] The invention relates to a kitchen range hood, in particular to an anti-dink range hood. Background technique [0002] With the widespread use of range hood centralized exhaust public flues in high-rise buildings in the community, the off-flavor of range hoods (residents who have not turned on range hoods can smell the smell of neighbors' kitchens with range hoods on other floors) has become a problem for range hoods. A problem for machine users. Although there is a check valve (single, double valve plate or louver structure) installed at the flue gas outlet of the original range hood, this type of check valve uses the self-weight of the valve plate as the closing force to cook and exhaust smoke at the same time in many places. The oil fume flow in the flue rises sharply, and when it passes through the flue outlet of a resident’s house where the range hood is not turned on, the check valve of the range hood will be opened due to the effect of pulling ...

AI Technical Summary

Problems solved by technology

Although there is a check valve (single, double valve plate or louver structure) installed at the flue gas outlet of the original range hood, this type of check valve uses the self-weight of the valve plate as the closing force to cook and exhaust smoke at the same time in many places. The oil fume flow in the flue rises sharply, and when it passes through the flue outlet of a resident’s house where the range hood is not turned on, the check valve of the range hood will be opened due to the effect of pulling the wind and the impact of the air flow, and the oil fume that penetrates everywhere will flow to the place without pressure. The space flows, causing the phenomenon that the oil fume is poured from the range hood into the room

The valve plate of the existing range hood check valve is very light in weight. After long-term impregnation with oil fumes, the greasy damping effect will cause the closure and opening of the check valve to be uncertain. In addition, the design and manufacture of the existing range hood check valve The leak caused by the defect when the valve plate structure is closed is also a reason for the off-flavor of the oil absorber

Another disadvantage of this type of check valve is: due to the greasy sticky effect, the valve plate and the valve housing will bond over time, resulting in the phenomenon that the valve plate cannot be opened when the range hood is turned on, hindering the exhaust.

However, the opening and closing of the check valve with this structure are controlled by the motor and the spring respectively. If the spring force is not enough or the spring force is reduced after long-term use, it will affect the closing effect of the check valve.

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