Auxiliary noise reduction device for draught fan system of single-inlet range hood

A technology of fan system and range hood, which is applied in the parts of pumping device for elastic fluid, removal of oil fume, machine/engine, etc. loss, the effect of reducing turbulence

Pending Publication Date: 2017-11-10
NINGBO FOTILE KITCHEN WARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in order to reduce the noise of the fan system, the common practice is to improve the structure of the collector at the air inlet of the fan. Noise collector and the range hood using the collector, which reduces noise by changing the propagation path of sound waves and interfering with each other by forming an integrated cavity between the outer ring and the inner ring of the collector , it can be seen that this range hood has not considered the problem of noise generated by the gap between the rear wall of the volute and the impeller, nor has it considered the noise generated by the fan motor when it is working.

Method used

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  • Auxiliary noise reduction device for draught fan system of single-inlet range hood
  • Auxiliary noise reduction device for draught fan system of single-inlet range hood
  • Auxiliary noise reduction device for draught fan system of single-inlet range hood

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Experimental program
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Effect test

Embodiment 1

[0027] like Figure 1 to Figure 3 As shown, the fan system auxiliary noise reduction device of the single-inlet range hood in this embodiment includes a volute 1, an impeller 2 and a fan motor 3, the front end of the fan system enters the wind, and the fan motor 3 is installed at the rear end of the fan system. A noise reduction cavity 4 is provided in the gap between the rear wall of the volute 1 and the rear end of the impeller 2, and the noise reduction cavity 4 is arranged around the fan motor 3, and a noise reduction hole is opened on the wall of the noise reduction cavity 4.

[0028] by figure 1 The direction indicated by the arrow A is forward, and the front cover 5 is installed in the gap between the rear wall of the volute 1 and the rear end of the impeller 2, and the noise reduction cavity 4 is formed between the front cover 5 and the rear wall of the volute 1 , the inner surface 51 of the front cover 5 constitutes the inner wall of the noise reduction cavity 4, the...

Embodiment 2

[0031] like Figure 4 and Figure 5 As shown, this embodiment changes the structure of the noise reduction cavity on the basis of the first embodiment. The interior of the noise reduction cavity is divided into a plurality of independent noise reduction chambers 41 , and each noise reduction cavity 41 corresponds to a through hole 7 . In this way, each independent sound-absorbing cavity 41 can reduce aerodynamic noise by utilizing the Helmholtz resonance principle, thereby obtaining better noise-reducing effect.

[0032] In addition, sound-absorbing cotton and other sound-absorbing materials can be filled in the sound-absorbing cavity 41 to obtain better sound-absorbing effects.

Embodiment 3

[0034] like Image 6 and Figure 7 As shown, in this embodiment, the inner side of the rear wall of the volute 1 is stretched forward to form a front convex part 11, and the front convex part 11 has an inner annular surface 111 surrounding the fan motor 3 and a hole close to the rear plate of the impeller 2. The front annular surface 112, wherein the inner annular surface 111 forms an inner wall surface, and the front annular surface 112 forms a front wall surface. In addition, a rear cover 6 is installed on the rear wall of the volute 1 , and the front protrusion 11 and the rear cover 6 enclose a noise reduction cavity.

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PUM

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Abstract

The invention discloses an auxiliary noise reduction device for a draught fan system of a single-inlet range hood. The auxiliary noise reduction device comprises a volute, an impeller and a draught fan motor, wherein air is input from the front end of the draught fan system; the draught fan motor is mounted at the rear end of the draught fan system; the auxiliary noise reduction device is characterized in that a noise reduction cavity is formed in a gap between a rear wall of the volute and a rear end part of the impeller; the noise reduction cavity is arranged around the draught fan motor; and noise reduction holes are formed in a wall surface of the noise reduction cavity. The auxiliary noise reduction device for the draught fan system of the single-inlet range hood, disclosed by the invention, has the advantages that after the noise reduction cavity is formed in the gap between the rear wall of the volute and the rear end part of the impeller, the gap between a rear disc of the impeller and the rear wall of the volute can be reduced, so that the reflowing loss can be effectively reduced; meanwhile, the turbulent flow is reduced and noises are reduced; and after the noise reduction cavity is arranged around the motor of the draught fan and the noise reduction holes are formed in the noise reduction cavity, the noises of the motor can be effectively reduced, so that the noises of the whole draught fan system are greatly reduced.

Description

technical field [0001] The invention relates to a range hood, in particular to an auxiliary noise reduction device for a fan system of a single-air intake range hood. Background technique [0002] The single-inlet fan system is widely used as a common type of range hood fan system, especially in the field of near-suction range hoods. There is a certain gap between the rear wall of the volute and the impeller of the single-inlet fan system. This gap will cause backflow, that is, the actual working flow of the fan will decrease, the pressure will decrease, and the gas backflow will form turbulent flow, which will generate noise. The noise source of the range hood comes partly from the aerodynamic noise generated by the fluid machinery, and partly from the noise of the drive motor itself. [0003] At present, in order to reduce the noise of the fan system, the common practice is to improve the structure of the collector at the air inlet of the fan. Noise collector and the ran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/66F24C15/20
CPCF04D29/663F04D29/664F04D29/665F24C15/20
Inventor 袁柯铭茅忠群诸永定李斌
Owner NINGBO FOTILE KITCHEN WARE CO LTD
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