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Blade for centrifugal fan, centrifugal fan and range hood

A centrifugal fan and blade technology, applied in the field of power system, can solve problems such as ineffective improvement and reduction of losses, and achieve the effects of reducing dynamic and static interference, reducing noise, and reducing airflow offset loss

Active Publication Date: 2020-11-20
NINGBO FOTILE KITCHEN WARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

see Figure 8 , the blades in any of the above-mentioned prior art, under typical operating conditions, the radial flow centrifugal impeller air intake shown by the simulation has a typical 90° offset, and the airflow flowing out after the impeller does work generally has a typical secondary flow (the air outlet from the trailing edge of the blade in the figure The arrow in the upper right corner of the position is the secondary flow), the above-mentioned arrangement of the leading edge and trailing edge of the blade cannot effectively improve and reduce the deflection of the impeller intake itself and the backflow and secondary flow after the blade leaves. Loss

Method used

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  • Blade for centrifugal fan, centrifugal fan and range hood
  • Blade for centrifugal fan, centrifugal fan and range hood
  • Blade for centrifugal fan, centrifugal fan and range hood

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The inner edge inlet side of the blade 23 is provided with a first structure 231, and the outer edge air outlet side of the blade 23 is provided with a second structure 232, and the first structure 231 has at least two, along the height direction of the blade 23 (the axial direction of the impeller). ) are arranged at intervals. In this embodiment, the shape of the first structure 231 is a reverse wing-shaped head. The overall shape of the second structure 232 is a wave shape that varies in height along the blade 23 .

[0036]Since the air flow enters along the axial direction of the impeller and flows out radially, it needs to be biased. Considering the existence of the natural bias angle, the anti-wing-shaped head is used to meet the impact of the incoming flow. Airfoils mainly include low-speed airfoils, subsonic airfoils and supersonic airfoils. Since the airflow inside the range hood generally does not exceed 50m / s, the airfoils in this embodiment can be low-speed...

Embodiment 2

[0046] see Figure 6 In this embodiment, the difference from the first embodiment above is that the second structure 232 is similar to the first structure 231 and has at least two structures arranged at intervals along the height direction of the blade 23 . Moreover, the second structure 232 is a positive airfoil head. For the same consideration, in this embodiment, the airfoil is a low-speed airfoil.

[0047] The outer edge of the blade 23 is the position of the maximum linear velocity of the impeller, while the middle airflow velocity is high, and there will be a secondary flow after exiting the impeller 2, and the loss is relatively obvious. Therefore, in this embodiment, the second structure 232 adopts a positive wing-shaped head. The airfoil faces the direction of the most concentrated airflow.

[0048] The distance between the recess on the outer edge of the blade 23 and the original outermost point of the outer edge of the blade 23 is B1, and the distance between the ...

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PUM

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Abstract

The invention discloses a blade for a centrifugal fan. At least two first structures are arranged on the air inlet side of the inner edge of the blade at intervals in the height direction of the blade. The blade is characterized in that the shape of each first structure is an inverted-wing-shaped head. The invention further discloses the centrifugal fan applying the blade and a range hood applyingthe centrifugal fan. The air inlet side of the inner edge of the blade adopts the inverted-wing-shaped curve heads, so that airflow bias loss and incoming flow impact loss are reduced, and the aerodynamic performance and efficiency are improved. The outer edge of the blade is shaped like gradient waves or a wing-shaped curve, dynamic and static interference of airflow between an impeller outlet and a volute is reduced, flowing of local airflow is controlled left and right through concave and convex parts, losses caused by secondary transverse flow after airflow flow-out are reduced, the efficiency is improved, and noise is lowered.

Description

technical field [0001] The invention relates to a power system, in particular to a blade for a centrifugal fan, a centrifugal fan with the blade, and a range hood with the centrifugal fan. Background technique [0002] Centrifugal fans, relying on the input mechanical energy, use the high-speed rotating impeller to accelerate the gas entering the impeller in the axial direction, then decelerate, change direction, flow out of the impeller radially, and finally exit through the air outlet of the volute. The air volume and pressure of the multi-blade centrifugal fan is high, and the smaller diameter of the impeller outlet can achieve a large air volume and pressure, low speed and low noise, and is often used in range hoods, suction and exhaust and other fields. [0003] The performance of the impeller directly affects the performance of the centrifugal fan (range hood). The blades of the existing impellers mainly adopt a single arc-shaped line structure. For example, the Chine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/30F04D29/28F04D29/66F04D17/16F24C15/20
CPCF04D17/16F04D29/283F04D29/30F04D29/663F04D29/666F04D29/667F24C15/20
Inventor 何立博
Owner NINGBO FOTILE KITCHEN WARE CO LTD