Reversible Axial Fan Blades with Blowing Slots

An axial flow fan and air blowing slot technology, applied in mechanical equipment, machines/engines, liquid fuel engines, etc., can solve problems such as energy loss and increase in manufacturing cost, and achieve reduction of additional energy loss, reduction of manufacturing cost, and complete The effect of improving the pressure efficiency

Active Publication Date: 2017-04-19
苏莫明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of the anti-surge ring improves the working ability of the reversible fan, but it produces additional energy loss and a substantial increase in manufacturing costs

Method used

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  • Reversible Axial Fan Blades with Blowing Slots
  • Reversible Axial Fan Blades with Blowing Slots
  • Reversible Axial Fan Blades with Blowing Slots

Examples

Experimental program
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Effect test

Embodiment 1

[0031] This embodiment is a reversible axial flow fan blade with air blowing slots, including a petiole 1 , a blade body 2 and an air blowing slot 3 .

[0032] Reversible axial flow fan blades are used for reversible axial flow fans with a diameter of D = 2m. The working speed of the reversible axial flow fan impeller is n = 980r.m.p, and the design flow Q = 60m 3 / s, design total pressure P=950Pa, number of impeller blades Z=10, blade top chord length L=250mm, hub ratio k=0.45. Blade top installation angle β an = 15°.

[0033] Three air blowing slots 3 are opened on the top of the blade of the reversible axial flow fan, and the center line in the width direction of each air blowing slot is in the same direction as the circumferential direction of fan rotation. The blade top is located at the top of the blade body 2 . In this embodiment, there are three air blowing grooves, the width of each air blowing groove is 5.5 mm, and the depth of each air blowing groove is 25 mm.

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PUM

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Abstract

The invention discloses a reversible axial flow fan blade with air blowing grooves. The reversible axial flow fan blade with the air blowing grooves comprises a blade body which is composed of a blade handle and a blade body part, wherein the at least two air blowing grooves are formed in the top of the blade body part in the circumferential direction and are evenly distributed on the surface of the top of the blade, and a wing type pressure surface of the top of the blade and a suction surface are communicated through the air blowing grooves. According to the symmetrical grooves, airflow flowing from the pressure surface to the suction surface is formed in the grooves by means of the high pressure difference between the pressure surface and the suction surface, and vortexes on the suction surface are blown away in the flowing direction. According to the reversible axial flow fan blade with the air blowing grooves, the grooves are formed in the top of the blade body part, in this way, the vortex structure of the suction force on the top of the blade can be maintained, the flowing intensity of loop flow on an inlet and the flowing intensity of the axial vortexes of the suction surface of the top of the blade are reduced, vortex loss and the friction loss are reduced, the total-pressure efficiency of a fan is improved, energy is saved, and consumption is reduced. It is proved through computer numerical values that the total-pressure efficiency of the reversible axial flow fan can be improved by 3%-5%, and the manufacturing cost is reduced by about 10%.

Description

technical field [0001] The invention belongs to the technical field of fluid machinery, and relates to a reversible axial flow fan blade with blowing grooves. Background technique [0002] Reversible axial flow fan refers to a fan with a symmetrical or anti-symmetrical airfoil impeller structure. At the design speed, the fan has the same aerodynamic characteristics regardless of the forward rotation or reverse rotation, that is, the same Pneumatic parameters such as pressure, flow, power, efficiency, etc. This special feature of the reversible fan makes the total pressure, flow rate and total pressure efficiency of the reversible fan very low compared with the axial flow fan of the same size, and the power consumption is very large. In order to improve the aerodynamic performance of the reversible fan, anti-surge ring devices are installed on both sides of the blade top of most of the widely used reversible axial fans at present. [0003] According to the design theory of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/38
CPCF04D29/388
Inventor 苏莫明洪灵
Owner 苏莫明
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