Noise reduction device of range hood

A technology for range hoods and noise reduction, which is applied to the removal of oil fumes, parts of pumping devices for elastic fluids, mechanical equipment, etc., which can solve problems such as insignificant noise reduction effects, troublesome design, and fan system interference. Achieve good versatility and adaptability, reduce transmission to the outside world, and solve noise problems

Active Publication Date: 2015-04-22
NINGBO FOTILE KITCHEN WARE CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Although the above-mentioned various passive noise reduction methods can also reduce noise, while reducing noise, they often lead to an increase in cost or at the expense of reducing the exhaust air volume of the range hood, and the noise reduction effect is not very obvious
As an improvement, active noise reduction is also used in the prior art to reduce the noise of the range hood. In the active noise reduction method of the range hood, the influence of the airflow on the microphone is extremely critical, and the disturbance of the airflow greatly interferes with the Improve the stability and noise reduction effect of the active noise reduction control system
For the active noise reduction of range hoods, please refer to the "Active Noise Reduction Device and Method and Noise Control System for Range Hoods" disclosed in the Chinese inventio

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0026] Such as Figure 1 to Figure 7 As shown, the noise reduction device of the range hood in this embodiment includes two groups of noise reduction devices, the lower noise reduction device 1 is detachably installed on the air inlet 6 of the fan, and the upper noise reduction device 2 is detachably installed on the air outlet 7 of the fan. , the user can freely disassemble and assemble according to the needs, has good versatility, and has good self-adaptability to the noise of any fan system. In this embodiment, the upper noise reduction device 2 and the lower noise reduction device 1 both include an upper mounting plate 3, a lower mounting plate 4 and two noise reduction units 5, and the two noise reduction units 5 in the lower noise reduction device 1 are respectively located at the sides of the air inlet 6 of the fan. On the left and right sides, the two silencing units 5 in the upper silencing device 2 are respectively located on the left and right sides of the air outle...

Embodiment 2

[0036] Such as Figure 8 As shown, the noise reduction device in this embodiment is only provided with a lower noise reduction device 1 at the air inlet 6 of the fan, and the lower noise reduction device 1 also includes two noise reduction units 5, and the structure of the noise reduction unit 5 is the same as that in Embodiment 1. The structure of the sound-absorbing unit is the same and will not be described here.

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Abstract

The invention relates to a noise reduction device of a range hood. The noise reduction device is characterized in that a fan inlet is detachably provided with a lower noise-damping device; the lower noise-damping device comprises at least one noise-damping unit; the noise-damping unit comprises a longitudinally arranged noise-damping pipeline; the upper end of the noise-damping pipeline is communicated with the fan inlet, and the lower end of the noise-damping pipeline is communicated with the air outlet of a fume collecting hood; the air inlet end of the noise-damping pipeline is provided with a speaker, the inner wall of the noise-damping pipeline is provided with a reference microphone and an error microphone which is positioned below the reference microphone; and the reference microphone, the error microphone and the speaker are controlled by an active noise reduction controller. The noise reduction device disclosed by the invention can realize the noise reduction without improving the internal structure of the range hood but just by detachably arranging the lower noise-damping device on the fan inlet, the noise-damping device can be assembled and dissembled freely, so that good universality and adaptability are achieved, the problem of noise at the air inlet of the rang hood can be well solved, and the problem of noise of the air outlet of the range hood can be solved by detachably arranging an upper noise-damping device on a fan outlet.

Description

technical field [0001] The invention relates to a range hood, in particular to a noise reduction device for the range hood. Background technique [0002] The range hood includes a blower fan, an air inlet filter screen and a range hood duct, and the fan is driven by a motor to suck out the oil fume inside the range hood duct. Fans and motors are important noise sources, and the aerodynamic noise also includes the turbulent airflow noise in the range hood duct and the noise generated by the airflow passing through the air inlet filter. [0003] At present, passive noise reduction is mainly used to reduce the noise of range hoods. Passive noise reduction generally uses aerodynamic methods to optimize the centrifugal fan and volute, or uses low-noise motors, or uses sound insulation or sound-absorbing material. Although the above-mentioned various passive noise reduction methods can also reduce noise, while reducing noise, they often lead to an increase in cost or at the cost...

Claims

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Application Information

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IPC IPC(8): F24C15/20F04D29/66
CPCF04D29/663F04D29/664F24C15/2021
Inventor 刘逸王青山刘戈茅忠群诸永定
Owner NINGBO FOTILE KITCHEN WARE CO LTD
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