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Noise reduction type air outlet hood for extractor hood

A range hood and noise reduction technology, which is applied in the field of noise reduction wind hood, can solve problems such as poor noise reduction effect, and achieve the effect of good noise reduction and noise reduction and the best noise reduction effect.

Pending Publication Date: 2018-07-03
NINGBO FOTILE KITCHEN WARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the air outlet hood achieves the noise reduction effect through the ejection and mixing of the surrounding air when the fan exhausts, the noise reduction effect achieved through ejection and blending is poor, and it cannot form, to achieve the effect of noise reduction in each position of the air outlet hood

Method used

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  • Noise reduction type air outlet hood for extractor hood
  • Noise reduction type air outlet hood for extractor hood
  • Noise reduction type air outlet hood for extractor hood

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as Figure 1 to Figure 5 As shown, the noise-reducing air outlet hood of the range hood in this embodiment includes main components such as a base 1 , an inner cover 2 , an outer cover 3 , and an air outlet ring 4 . An upper sealing ring 41 is formed on the bottom of the air outlet ring 4, and a lower sealing ring 11 is formed on the base 1. The top of the inner cover 2 is sealed and connected to the upper sealing ring 41, and the bottom of the inner cover 2 is sealed and connected to the lower sealing ring 11. Above, the top of the cover 3 is fastened to the air outlet ring 4 by screws 6 , and the bottom of the cover 3 is fastened to the base 1 by screws 6 .

[0028] In this embodiment, a plurality of noise reduction holes 21 are opened on the peripheral wall of the inner cover 2, and the noise reduction holes 21 are round holes. A plurality of noise reduction holes 21 corresponding to the noise reduction holes 21 are formed between the inner cover 2 and the outer...

Embodiment 2

[0033] Such as Figure 6 As shown, the noise reduction cavity 5 of the air outlet hood of this embodiment is formed on the outer wall of the inner cover 2. Similarly, a noise reduction cavity 5 corresponds to a noise reduction hole 21. The noise reduction principle is the same as that of the first embodiment. This does not expand the description.

Embodiment 3

[0035] The noise reduction chamber 5 in this embodiment is a ring noise reduction chamber distributed along the horizontal plane, and the noise reduction holes 21 on the same horizontal ring surface are all arranged in the same ring noise reduction chamber.

[0036] Such as Figure 7 As shown, the ring noise reduction cavity is located on the inner wall of the outer cover 3, as Figure 8 As shown, the ring-shaped noise reduction cavity is arranged on the outer wall of the inner cover 2 . Figure 7 and Figure 8 In the two structures shown, multiple noise reduction holes 21 correspond to one noise reduction cavity 5 to form a parallel resonant cavity. The principle of noise reduction is the same as that of Embodiment 1, and will not be described here.

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Abstract

The invention discloses a noise reduction type air outlet hood for an extractor hood. The noise reduction type air outlet hood comprises a base and a hood body on the base and is characterized in thatthe hood body comprises an inner hood and an outer hood, the peripheral wall of the inner hood is provided with multiple noise reduction holes and the inner hood and the outer hood form multiple noise reduction cavities corresponding to the noise reduction holes. The peripheral wall of the inner hood is provided with the multiple noise reduction holes, the inner hood and the outer hood form multiple noise reduction cavities corresponding to the noise reduction holes, air columns in the noise reduction holes and air in the noise reduction cavities form an elastic resonance system, when a partof the noise frequency of the extractor hood is the same to the inherent frequency of the resonance system, the air columns in the noise reduction holes produce resonance and violent friction with thehole walls and through the friction, the acoustic energy is converted into heat energy so that the noise elimination is realized. The noise reduction type air outlet hood has good noise reduction andelimination effects based on the Helmholtz resonance sound elimination principle. According to the diversion form of the air outlet hood, the noise reduction effects on all parts of the air outlet hood are optimal.

Description

technical field [0001] The invention relates to an air outlet cover of a range hood, in particular to a noise reduction type air outlet cover of a range hood. Background technique [0002] Chinese cooking will produce a lot of oily fumes. In order to keep the kitchen environment clean and the human body healthy, range hoods have become one of the essential equipment in modern home kitchens. During operation, the range hood inhales gas through its air inlet, and discharges the gas through the fan outlet. Existing range hoods are generally equipped with an air outlet cover at the air outlet of the blower fan, and the air outlet cover has the functions of gathering gas and guiding flow, and connecting the range hood and the air outlet pipe. The airflow generated by the fan needs to be converged into the air outlet hood eventually, which makes the air flow in the air outlet hood too concentrated, and the airflow movement in the hood produces turbulence and noise, which in turn ...

Claims

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Application Information

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IPC IPC(8): F24C15/20
CPCF24C15/2078
Inventor 袁柯铭茅忠群诸永定李斌
Owner NINGBO FOTILE KITCHEN WARE CO LTD
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