Range hood noise reduction method and device and range hood using device

A hood and noise technology, which is applied in the field of range hood equipment, can solve problems such as excessive noise of hoods, and achieve the effects of improved noise performance indicators, large sound-absorbing surface area, and good noise absorption effect

Pending Publication Date: 2019-10-25
HANGZHOU ROBAM APPLIANCES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned problem that the excessive noise of the hood is mainly concentrated i

Method used

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  • Range hood noise reduction method and device and range hood using device
  • Range hood noise reduction method and device and range hood using device
  • Range hood noise reduction method and device and range hood using device

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] Aiming at the technical problem of excessive hood noise, a specific embodiment to solve the above problem is listed here. A noise reduction device for a hood, comprising a covering part 1 covered in the air duct system of the hood. The covering part 1 covers the area between the butt of the hood body and the fan to the air outlet of the fan; the covering part 1 and A closed cavity is formed between the air outlet fan of the hood and the impeller, and the inner surface of the covering portion 1 is provided with a layer of sound-absorbing material.

[0032] The cladding structure is easy to install and can absorb noise scattered around the cladding area. The sound-absorbing material layer is a sound-absorbing wedge.

[0033] Sound absorption mechanism of sound-absorbing wedge: Sound-absorbing structure is generally divided into flat structure and impedance transition structure. For the original flat structure, according to the theory of sound wave propagatio...

Example Embodiment

[0034] Example 2

[0035] This embodiment is further defined on the basis of embodiment 1. The sound-absorbing material layer is a sound-absorbing wedge. The sound-absorbing wedge is composed of a base 3 and a wedge 4, and the wedge 4 from the top to the part in contact with the base is Gradual cross-sectional area structure. The covering part 1 is a wall structure surrounded by four sides. The lower end of the enclosed space is fixedly connected with the body of the hood. The upper end of the enclosed space is provided with a cover plate 5, and the cover plate 5 is provided with a through hole adapted to the air outlet . The inner wall of the cover plate 5 is provided with a sound-absorbing wedge.

[0036] The cross-sectional area of ​​the sound-absorbing wedge is a gradual structure, and due to the bulge, the contact area between the sound-absorbing material and the sound wave is increased. When the wedge unit contacts the sound wave, the sound wave reaches the tip of the sound...

Example Embodiment

[0037] Example 3

[0038] This embodiment is further defined on the basis of Embodiment 1. The wedge is a triangular prism with an isosceles triangle bottom surface, the base is square, and the rectangular surface corresponding to the hypotenuse of the triangle of the wedge is opposite to the base. reference Figure 1-Figure 3 .

[0039] This embodiment provides an arrangement of the sound-absorbing wedge of Embodiment 3, and the wedge portions are arranged in a staggered array on the inner wall of the covering portion. reference Figure 5 .

[0040] Regarding the staggered array, a comparative example is given here. The staggered sound-absorbing panel and the non-displaced sound-absorbing panel are tested in front of the noise probe, and the data is added four times. The comparison shows that the noise of the staggered layout is reduced. The amount is 8.1dBA, and the noise reduction of non-dislocation layout is 3.03dBA.

[0041] The ratio of the size setting is given here: the ra...

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Abstract

The invention belongs to range hood equipment for kitchens, and particularly relates to a range hood noise reduction method and device and a range hood using the device. The noise reduction device comprises a cover part covering a flue duct system of the range hood, wherein the cover part covers the area from the butt joint part between a range hood body and a fan to an air outlet of the fan, a closed cavity is formed among the cover part, the air outlet fan of the range hood and impellers, and a sound absorption material layer is arranged on the inner surface of the cover part. According to the technical scheme, noise in a noise gathering area can be processed, the noise performance index during operation of the range hood is greatly improved, the noise absorption ratio on the clapping part is greatly improved, and good use experience is provided for a user. According to the device, a semi-closed sound absorption structure with a wedge part is located at a neck part of the range hood,namely the air outlet fan position, so that the structure is not in direct contact with a flue duct, the semi-closed sound absorption structure is not easy to cover by oil stain of the range hood, sothat good sound absorption performance can be kept in a long period.

Description

technical field [0001] The invention belongs to range fume equipment for kitchens, and specifically refers to a noise reduction method and device for a range hood and a range range device using the device. Background technique [0002] Range hood is an essential household kitchen appliance, and the noise during its operation has always been one of the performance indicators that consumers focus on. Therefore, the noise reduction work of the range hood is particularly important. For range hoods, the operating noise of the internal fan and the aerodynamic noise at the air outlet of the air duct system have always been the difficulty and focus of noise reduction, especially the noise at the joint between the air outlet and the exhaust pipe. The noise sources and enrichment areas in each part are mainly concentrated in the upper part of the range hood shell. Currently, due to the limitation of the internal space of the range hood, no effective noise reduction scheme has been imp...

Claims

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Application Information

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IPC IPC(8): F04D29/66F24C15/20
CPCF04D29/664F24C15/20
Inventor 任富佳王丁一于巍巍周海昕班永李智宝
Owner HANGZHOU ROBAM APPLIANCES CO LTD
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