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Blower volute structure of top-sucking kitchen ventilator

A technology for a range hood and a fan, applied in the field of component structure, can solve the problems of high suction and low noise, and achieve the effects of reducing noise, reducing eddy current, and improving the efficiency of range hood.

Inactive Publication Date: 2002-05-08
NINGBO FOTILE KITCHEN WARE CO LTD
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  • Abstract
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Problems solved by technology

[0002] Now, range hoods have become one of the essential kitchen equipment for ordinary families. Among them, range hoods using centrifugal fans are very popular because of their relatively large suction and low noise. However, the noise still exists, and the noise is generally It comes from two aspects, one is the noise of the fan itself, and the other is the noise caused by the turbulent flow of the airflow in the fan volute. The existing various noise reduction structures are based on the design of how to reduce the noise source. In noise technology, there is also a principle of "active noise reduction", that is, artificially forming a new sound source with the same amplitude as the noise source but opposite in phase to cancel the original noise. However, after spectrum analysis, the noise of the range hood It is a continuous spectrum with considerable intensity in the range of 6.3Hz to 20Khz, so it is difficult to completely cancel it, but it is still possible to achieve partial cancellation

Method used

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  • Blower volute structure of top-sucking kitchen ventilator
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  • Blower volute structure of top-sucking kitchen ventilator

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Embodiment Construction

[0013] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0014] Such as Figure 1 ~ Figure 4 As shown, the fan volute structure of the top suction range hood includes an upper casing 1, a lower casing 3 and an annular middle casing 2 connecting the two, wherein the upper casing 1 and the lower casing 3 are asymmetrical structures , at the volute tongue, the radius of curvature of the lower shell edge curve 31 is smaller than the curvature radius of the upper shell edge curve 11, and the middle shell 21 here connects the two with a continuous and smooth transitional twisted surface; figure 1 Middle 4 is a fan, 5 is a range hood cover, and 7 is a motor driving the fan 4;

[0015] At the volute tongue, the ratio of the radius of curvature of the lower casing edge curve 31 to the curvature radius of the upper casing edge curve 11 is preferably 5:29.1; wherein the scheme shown in Figure 5 is the best, t...

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Abstract

The blower volute structure of top-sucking kitchen ventilator includes upper casting, lower casing and the middle annular casing connecting the aforesaid casing through continuous and smooth transition, and features that the upper casing the lower casing has asymmetrical structure with the curvature radius of the lower casing edge at volute tongue being smaller than that of upper casing. The asymmetrical structure makes the airflow form one new noise source at volute tongue with continuous spectrum and the new noise can counteract partial original noise of the kitchen ventilator to reduce total noise and make it possible to install great power motor with great noise in kitchen ventilator.

Description

technical field [0001] The invention relates to a component structure of a range hood, in particular to a fan volute structure of the range hood. Background technique [0002] Now, range hoods have become one of the essential kitchen equipment for ordinary families. Among them, range hoods using centrifugal fans are very popular because of their relatively large suction and low noise. However, the noise still exists, and the noise is generally It comes from two aspects, one is the noise of the fan itself, and the other is the noise caused by the turbulent flow of the airflow in the fan volute. The existing various noise reduction structures are based on the design of how to reduce the noise source. In noise technology, there is also a principle of "active noise reduction", that is, artificially forming a new sound source with the same amplitude as the noise source but opposite in phase to cancel the original noise. However, after spectrum analysis, the noise of the range hoo...

Claims

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Application Information

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IPC IPC(8): F04D29/44F24C15/20
Inventor 茅忠群陈安林田大钧刘训谦杨新铁胡欲立
Owner NINGBO FOTILE KITCHEN WARE CO LTD
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