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Airflow generating structure and the apparatus thereof

a technology of airflow and generating structure, which is applied in the direction of machines/engines, stators, liquid fuel engines, etc., can solve the problems of increasing noise and vibration, shortening the service life, etc., and achieves the effect of reducing noise, reducing noise, and increasing rotational velocities

Inactive Publication Date: 2007-01-11
RISUN EXPANSE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] As previously discussed, the conventional axial-flow fan has the drawbacks of a lower flow rate, causing more noise and greater vibrations at higher rotational velocities, and a shorter service life due to vibration of the blades. As for the radial-flow fan, the structure thereof forces the airflow to change the path of flow abruptly, posing more resistance to the airflow and thereby reducing the flow rate. Though the diagonal-flow fan combines the structures of the radial-flow fan and the axial-flow fan with the advantages of a higher discharging tangential velocity and a greater generated dynamic pressure than those of the axial-flow fan, the generated dynamic pressure and flow rate still have the room for improvement.
[0010] In view of aforementioned problems, the primary object of the present invention is to provide an airflow generating structure and the apparatus thereof that has a high flow rate in a less noisy operating condition, and can also generate a higher dynamic pressure of discharge airflow, and is more desirable for use in radiators with a higher flow resistance.
[0013] By means of the structure set forth above, the spoilers are formed axially on the holding section, and the number of the spoilers installed can be greater (than that of the axial-flow fan with radially installed spoilers) to discharge more airflow and the rotational velocity could be reduced compared with the axial-flow fan for the same amount of flow rate. A lower rotational velocity can reduce impact of the air at the tips of the spoilers and reduce the noise. The holding surface is pressed by the airflow to confine the position of the airflow generating structure, so that the back and forth movements and vibrations caused by the assembly clearance can be minimized.
[0014] Moreover, the inclination angle between the spoilers and the axial direction can lead the airflow to change the path of flow less abruptly. Thereby, the vortex and stagnant flow around the hub are reduced, and the flow resistance decreases. As a result, the flow rate increases accordingly. As the airflow is discharged on the outmost area of the airflow generating structure, a maximum tangential velocity could be got to generate a higher dynamic pressure.

Problems solved by technology

As previously discussed, the conventional axial-flow fan has the drawbacks of a lower flow rate, causing more noise and greater vibrations at higher rotational velocities, and a shorter service life due to vibration of the blades.

Method used

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  • Airflow generating structure and the apparatus thereof

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first embodiment

[0030] Referring to FIGS. 5 and 6 for the invention, the airflow generating structure 10 includes a hub 11, a holding section 12, a plurality of spoilers 13 and a stabilization ring 14.

[0031] The hub 11 has a top end 111 and a bottom end 112. The top end 111 is substantially formed in a convex shape. The bottom end 112 has a concave portion 113 to hold a spindle 15 protruding outwards.

[0032] The holding section 12 is substantially an annular plate integrally formed on the periphery of the bottom end 112, and is extended outwards from the hub 11, and has a holding surface 121 on one side, facing upwards.

[0033] Each of the spoilers 13 has a convex surface and a concave surface to form a curved profile. Each spoiler 13 has a root 131 and a tip 132, and has a height approximated to that of the hub 11. The root 131 is fastened to the holding section 12. The spoilers 13 are located round the periphery of the holding section 12 in an equally-spaced manner. The tip 132 is remote from the ...

second embodiment

[0046] Refer to FIG. 11 for the invention that provides an airflow generating structure 40 with an improved air channeling effect. It includes a hub 41, a holding section 42, a plurality of spoilers 43 and a stabilization ring 44 that are largely like those previously discussed. The main distinction of the two is that there is a round angle 45 formed between the juncture of the holding section 42 and the hub 41. Hence when the airflow passes rapidly from the upper side of the hub 41 towards the holding section 42, the round angle 45 can channel the airflow smoothly to the periphery of the holding section 42 and discharge the airflow through the lower side of the hub 41, to avoid directly hitting the holding section 42. Hence kinetic energy loss of air can be reduced, and the flow rate and dynamic pressure can be maintained without dropping too much.

[0047] Refer to FIG. 12 for a third embodiment of the invention that provides an airflow generating structure 50 with an improved air ch...

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Abstract

An airflow generating structure and the apparatus thereof includes a hub, a holding section extended outwards from one end of the hub, and a plurality of spoilers located on the periphery of the holding section in the axial direction that are spaced from one another. Each of the spoilers has two curved surfaces and an outer edge inclined outwards so that the area that all the tips of the spoilers enclose is larger than that of the holding section. Air is sucked in through one end of the hub remote from the holding section and flows towards the other end, and is discharged through the periphery of the holding section.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a fan and particularly to an airflow generating structure and the apparatus thereof with less operational noise and a higher flow rate. BACKGROUND OF THE INVENTION [0002] A fan mainly aims to discharge airflow and result in forced convection. In general a fan draws air in a direction parallel with the spindle axis of the impeller and drives the air through the blades. The airflow direction depends on the geometric structure of the impeller. Refer to FIGS. 1A through 1C for the geometric structure of an impeller. According to the relative directions of intake and discharge airflow, a fan can be classified in one of the three types: axial-flow fan 1, radial-flow fan 2 and diagonal-flow fan 3. [0003] Referring to FIGS. 1A and 2, the directions of intake and discharge airflow of the axial-flow fan 1 are the same. The axial-flow fan 1 has the advantages of a simple structure and lower fabrication cost. Hence it is widely used...

Claims

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Application Information

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IPC IPC(8): F04D29/44
CPCF04D29/281
Inventor HUANG, CHIANG-CHENGSUN, CHIEN-CHUNG
Owner RISUN EXPANSE
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