Noise reduction type extractor hood
A range hood and noise-reducing technology, which is applied in the field of noise-reducing range hoods, can solve problems such as the vibration of the cabinet cavity, the large noise of the dual-fan system, and the increase in the size of the internal cavity of the structure, so as to achieve increased noise reduction. Noise bandwidth, good noise reduction effect
Pending Publication Date: 2019-05-31
NINGBO FOTILE KITCHEN WARE CO LTD
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Problems solved by technology
Although, by connecting two fans in series to increase the static pressure to overcome the adverse effects of back pressure, the effect of smoke extraction and exhaust can be significantly improved, but due to the structure of two stages in series, it is necessary to integrate the two stages in product design. All the structures are put into the shell, which increases the size of the internal cavity of the structure, making it easy to cause the vibration of the shell cavity when the range hood is at a low frequency, resulting in poor sound quality and sound amplitude of the range hood. The value is larger, moreover, the noise of the double fan system is larger in the environment of low resistance
[0003] In order to reduce the noise of range hoods, people have invented various range hoods with noise-reducing structures, such as "A Silent Type" disclosed in the Chinese invention patent No. 201310627547. Range hood", the air inlet cavity of the range hood is not isolated from the whole machine shell, and the noise reduction closed cavity is located on the inside of the front cover of the whole machine, facing the inlet of the fan system and the diversion wind deflector. According to the structure It is known that the two kinds of noise-reducing closed cavities are located on the path of the air intake channel. Due to the influence on the air intake air flow, the micro-hole closed cavities are made relatively small, and the distance from the micro-holes to the rigid wall is small, so the noise reduction The frequency will be relatively high, and it is difficult to effectively reduce the low-frequency noise that accounts for most of the laboratory conditions
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[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0026] Such as Figure 1 to Figure 8 As shown, the noise-reducing range hood includes a fan frame 1. The inside of the fan frame 1 is divided into a lower chamber 2 and an upper chamber 3. A main-stage fan 4 is installed in the lower chamber 2. In the upper chamber 3 A secondary fan 5 is installed, and the air outlet of the primary fan 4 is in fluid communication with the air inlet of the secondary fan 5 through the air guide connecting pipe 9. The air outlet cover 11. In this embodiment, both the primary fan 4 and the secondary fan 5 are single-inlet centrifugal fans with front air intake, and the primary fan 4 and the secondary fan 5 are all inclined forward relative to the vertical plane, and the primary fan The air inlet surface of the fan 4 and the air inlet surface of the secondary fan 5 are parallel to each other.
[0027] In this em...
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Abstract
The invention discloses a noise reduction type extractor hood which comprises a fan frame. The interior of the fan frame is divided into a lower cavity and an upper cavity, a primary fan is installedin the lower cavity, a secondary fan is installed in the upper cavity, an air outlet of the primary fan is in fluid communication with an air inlet of the secondary fan, the upper cavity and the lowercavity are separated by a first noise reduction pore plate and a second noise reduction pore plate, the first noise reduction pore plate is an air outlet plate of the primary fan, the second noise reduction pore plate is arranged on the rear side of the primary fan, and the front side of the primary fan is provided with an air inlet cavity which communicates with the lower cavity. The noise reduction type extractor hood has the advantages that when a fan system works, noise produced by the primary fan is introduced into the lower cavity and reduced by a sealed resonant cavity formed by the first and second noise reduction pore plates and the lower cavity, a symplectic series noise reduction system is formed and has the good noise reduction effect particularly for low frequency noise, andthe noise reduction bandwidth is increased.
Description
technical field [0001] The invention relates to a range hood, in particular to a noise reduction type range hood. Background technique [0002] When ordinary household range hoods are in use, the oil fume needs to be discharged through resistance devices such as smoke exhaust pipes, check valves and smoke exhaust channels. The existence of these resistance devices makes the oil fume have a certain back pressure at the oil fume outlet. The existence of back pressure will greatly affect the exhaust flow of the range hood. In order to overcome the adverse effects caused by back pressure as much as possible, people have designed a range hood with two fans connected in series, such as the "A Kind of Series double fan type range hood", the series double fan type range hood divides the fan cover into upper and lower chambers, the main fan is installed in the lower chamber, and the secondary fan is installed in the upper chamber. The primary fan is usually used to overcome the res...
Claims
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Inventor孙佳琪袁柯铭胡泽元李晓强施旭娜
OwnerNINGBO FOTILE KITCHEN WARE CO LTD