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Multi-wing centrifugal fan

A centrifugal fan and air inlet technology, used in mechanical equipment, machines/engines, liquid fuel engines, etc., can solve problems such as insignificant effects and unsmoked gas diversion, and achieve noise reduction, flow field improvement, and environmental protection effects. Effect

Pending Publication Date: 2017-11-10
NINGBO FOTILE KITCHEN WARE CO LTD
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Problems solved by technology

In this way, when the air flow passes through the air inlet, the rectification effect of the rectification net is used to avoid turbulent flow when the flue gas enters the air inlet; obvious
[0004] Another example is CN201110432232.0 which discloses a "Multi-blade Centrifugal Fan with Multifunctional Flow Guidance Device", in which guide blades and flow guides are installed in the inner cavity of the impeller, which can affect the air pressure, air volume and other performances of the range hood. It has been improved, but because the patented guide vanes and deflectors only cover very little space in the inner cavity of the impeller, they do not effectively guide all the soot gas in the inner cavity of the impeller

Method used

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Examples

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Embodiment 2

[0040] Such as Figure 8 to Figure 10 As shown, the guide vane 3 in this embodiment is a propeller structure, the width of the root of the spiral surface is 15 mm, and the maximum width of the end is 45 mm.

[0041] The rest is the same as in Example 1.

[0042] The rotation of the guide vanes with multiple helical structures can make the negative pressure at the air inlet of the volute form a 360° rotation area, forming a tornado effect; when sucking and exhausting oil fume, the small particles of oil fume can rotate and collide and aggregate into large particles, which are then centrifuged The centrifugal force generated by the fan impeller is thrown to the inner ring wall of the volute, which effectively improves the oil and smoke separation effect. At the same time, when the oil fume passes through the guide vanes, it must bypass the swirling blades and enter the impeller blades. In this process, the oil fume will contact the swirling blades to filter out a part of the grease,...

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Abstract

The invention relates to a multi-wing centrifugal fan. The multi-wing centrifugal fan comprises a volute, and an impeller and a motor arranged in the volute; and the volute is provided with an intake port and an exhaust port. The multi-wing centrifugal fan is characterized in that at least two guide blades static corresponding to the volute are arranged on the inner side of the impeller in the volute at intervals; preferentially, the guide blades are spirally arranged corresponding to the center of the intake port; and the rotating direction of the guide blade is the same with the rotating direction of the impeller. Compared with the prior art, the multi-wing centrifugal fan can effectively reduce the energy loss and the noise, and meanwhile, improves the flow distribution uniformity in the peripheral direction of the impeller to achieve the effects of improving the air quantity, the air pressure and the total pressure efficiency of the fan and reducing the noise of the fan.

Description

Technical field [0001] The invention relates to a centrifugal fan, in particular to a multi-blade centrifugal fan. Background technique [0002] Fans used in range hoods are mostly multi-blade centrifugal fans. The airflow field at the impeller inlet of the centrifugal fan will produce turbulent flow, swirling flow and other turbulent air fields, which will reduce the air volume, wind pressure, and total pressure efficiency of the fan. [0003] CN201020287875.1 discloses a "range hood fan unit with rectifying function", which is fixedly covered and installed with a rectifying net at the air inlet of the fan volute. In this way, when the airflow passes through the air inlet, the rectification effect of the rectifier net prevents the formation of turbulence when the flue gas enters the air inlet; however, because the part of the patent rectifier net is a certain distance from the blade inlet, the effect of this improvement is still not obvious. [0004] Another example is CN201110432...

Claims

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Application Information

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IPC IPC(8): F04D29/44F04D29/66F04D29/70F24C15/20
CPCF04D29/444F04D29/667F04D29/703F24C15/20
Inventor 唐兴旺施旭娜茅忠群诸永定李斌
Owner NINGBO FOTILE KITCHEN WARE CO LTD
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