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Blade, impeller applying same, fan system and range hood

A technology of fan system and range hood, which is applied to machines/engines, components of pumping devices for elastic fluids, mechanical equipment, etc. The effect of secondary vortex, noise reduction and efficiency improvement

Active Publication Date: 2022-07-01
NINGBO FOTILE KITCHEN WARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing range hoods generally use multi-wing centrifugal fans as power devices, and the blades 100 of the impellers of the fans are mainly single arc blades, see Figure 8 and Figure 9, on the one hand, the air intake states are different at different positions in the circumferential direction, and the suction surface of the blade near the inlet side (the back side of the work) Because the negative pressure difference is easy to produce large local reflux (such as Figure 9) will reduce the efficiency and increase the noise. On the other hand, the outer blades along the length direction will have greater friction on the airflow, making the gas flow not smooth, and will be separated by the suction surface boundary layer together. The generation of secondary vortex will also reduce efficiency and increase noise

Method used

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  • Blade, impeller applying same, fan system and range hood
  • Blade, impeller applying same, fan system and range hood
  • Blade, impeller applying same, fan system and range hood

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] see Figure 1 to Figure 3 , an impeller used in a fan system, the fan system is a multi-blade centrifugal fan, which can be mainly used in range hoods, and can also be used in other occasions that require similar power devices.

[0038] The impeller includes two end rings 1 ( figure 1 Only one of the two end rings 1 is shown, the positional relationship of the two end rings 1 is the same as that of the prior art) and the blades 2 mounted on the end rings 1 are arranged between the two end rings 1 along the circumferential interval of the end rings 1 , the airflow enters from the inlet 21 of the blade 2 , flows along the blade channel Q between two adjacent blades 2 , and flows out from the outlet 22 of the blade 2 . The inlet 21 is closer to the radially inner side of the impeller 2 than the outlet 22 .

[0039] The blade 2 comprises a first blade section 23, a second blade section 24 and a step 25 between the first blade section 23 and the second blade section 24, w...

Embodiment 2

[0050] see Figure 5 , in this embodiment, the difference from the above-mentioned first embodiment is that the step portion 25 includes at least two steps, and there are three steps as shown in the figure, wherein PQ1 corresponds to the first step, and Q1P2 corresponds to the first step. The second level is an arc segment, and P2Q corresponds to the third level. Slots or slits 251 may be formed on PQ1 or P2Q. The circular arc convex directions of the circular arc segments in each blade segment and the stepped portion 25 are the same.

Embodiment 3

[0052] see Image 6 , in this embodiment, the difference from the above-mentioned first embodiment is that the step portion 25 includes at least two steps, and there are two steps as shown in the figure, wherein PP2 corresponds to the first step, and P2Q corresponds to the first step. Secondary. Slots or slits 251 may be formed in PP2 or P2Q.

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PUM

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Abstract

The invention discloses a blade, an impeller applying the blade, a fan system and a range hood, the blade comprises an inlet and an outlet, and the blade is characterized by further comprising a first blade section, a second blade section and a step part located between the first blade section and the second blade section, the inlet is formed in the end, away from the step part, of the first blade section, and the outlet is formed in the end, away from the step part, of the second blade section; the molded line of the blade has a center O, the molded line starting point of the step part is P, the end point is Q, and the length of PO is larger than QO. Compared with the prior art, the blade has the advantages that the structure that the double arcs are combined with the step part is arranged, the working angle of the blade is preposed, and large vortexes are prevented from being generated; the step part balances partial pressure difference, and large energy loss caused by large vortex growth is avoided.

Description

technical field [0001] The invention relates to a power device, in particular to a blade, an impeller applied with the blade, a fan system applied with the impeller, and a range hood applied with the fan system. Background technique [0002] The multi-blade centrifugal fan has the characteristics of high pressure and low noise, so the current society generally uses the multi-blade centrifugal fan system as the power source, and uses the high-speed rotating impeller to complete the two functions of work and filtration in the volute. For example, it is commonly used in range hoods. The multi-blade centrifugal fan installed inside the range hood sucks and discharges oil fume. The multi-blade centrifugal fan includes a volute, an impeller installed in the volute, and a motor that drives the impeller to rotate. When the impeller rotates, the The center of the fan generates negative pressure suction, sucking the oil fume under the range hood into the fan, and after being accelerat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/30F04D29/28F04D29/66F04D29/68
CPCF04D29/30F04D29/283F04D29/666F04D29/667F04D29/681Y02E10/72
Inventor 何ē«‹åš
Owner NINGBO FOTILE KITCHEN WARE CO LTD