Centrifugal fan

一种离心式风扇、叶片的技术，应用在加热方式、非变容式泵、空间供热和通风等方向，能够解决气流速度降低、叶片16性能降低等问题

Inactive Publication Date: 2010-09-01
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, this corner area is a stagnant water area, which becomes the main cause of the decrease in airflow velocity
Therefore, the original performance of the blade 16 is reduced
As in the structure disclosed in Patent Document 2, even if the front edge 16a of the blade 16 is only inclined in the direction of rotation, the above-mentioned problem cannot be solved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0069] Below, refer to Figure 1 to Figure 5 A first embodiment in which a centrifugal fan (turbo fan) of the present invention is applied to an indoor unit of a ceiling-embedded air conditioner will be described.

[0070] Such as Figure 1 ~ Figure 3 As shown, the centrifugal fan (turbo fan) 11 has a circular main board (hub) 14, a cylindrical side plate (shield) 15, and has a plurality of blades (moving blades) between the main board 14 and the side plate 15. )16. Main board 14 is fixed on Figure 31 The rotational drive shaft 13a of the fan motor 13 is shown. The blades 16 are arranged along the circumferential direction at a predetermined blade angle and at predetermined intervals. The side plate 15 has two open ends having different outer diameters. One open end of the side plate 15 forms an air suction port for guiding air in the centrifugal direction inside the impeller. The air outlet part 6c of the bell mouth 6 is loosely fitted in the air suction end part 15a o...

no. 2 Embodiment approach

[0080] Below, refer to Figure 6 ~ Figure 10 A second embodiment in which the centrifugal fan of the present invention is applied to an indoor unit of a ceiling-embedded air conditioner will be described.

[0081] In the second embodiment, if Figure 6 ~ Figure 10 As shown, in the first embodiment, the curved portion is also formed in the vicinity of the connecting portion between the blade 16 and the main plate 14 of the centrifugal fan. As a result, the horseshoe-shaped eddy flow generated on both surfaces of the blade 16 is suppressed at the connecting portion between the blade 16 and the main plate 14 .

[0082] Such as Figure 1 to Figure 5 As in the first embodiment shown, when the blades 16 are vertically provided with respect to the planar main plate 14, as Figure 36 ~ Figure 38 As shown, a horseshoe-shaped vortex is formed centering on the intersection of the main plate 14 and the leading edge 16 a of the blade 16 . Since the formation and increase of such a hors...

no. 3 Embodiment approach

[0088] Below, refer to Figure 12 A third embodiment in which the centrifugal fan of the present invention is applied to an indoor unit of a ceiling-embedded air conditioner will be described.

[0089] In the third embodiment, if Figure 12 As shown, it is characterized in that the same horseshoe-shaped eddy current suppressing portion as in the second embodiment is constituted by the forward vane structure S. The advancing wing configuration S is formed by protruding a portion of the leading edge 16 a of the blade 16 close to the main plate 14 by a predetermined size toward the center of the main plate 14 .

[0090] According to the structure, such as Figure 12 As shown by the phantom line arrows of , on both sides of the blade 16, a pressing force by the suction airflow (main flow) acts on the connecting portion between the leading edge 16a of the blade 16 and the main plate 14. Therefore, it is difficult to form a horseshoe-shaped eddy, or the horseshoe-shaped eddy can ...

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Abstract

A centrifugal fan has a circular main plate rotationally driven by the rotating shaft of a motor, blades fixed to the outer periphery of the main plate with predetermined intervals arranged in the circumferential direction of the main plate, and a side plate fixed to those ends of the blades which are on the side opposite the main plate. An air suction hole is arranged at the center of the side plate. The side plate has a circular-arc cross-sectional shape outwardly inclining in the centrifugal direction from the air suction opening and having a predetermined curvature. Between the side plate and the blades is provided a space for reducing adead air region. The space forms smooth flows on both sides of a blade to allow the blades to exhibit good performance.

Description

technical field [0001] The present invention relates to the construction of centrifugal fans. Background technique [0002] For example, Patent Document 1 discloses a centrifugal fan such as a turbofan having a plurality of blades between a main plate and a side plate (shroud). Figure 31 ~ Figure 34 A turbo fan suitable for an indoor unit of a ceiling-embedded air conditioner is shown. [0003] Such as Figure 31 ~ Figure 34 As shown, the indoor unit 1 for a ceiling-embedded air conditioner has a box-shaped main body casing 2 embedded in a ceiling 3 . An intake / exhaust panel 4 is provided on the lower surface of the main body casing 2 . The intake / exhaust panel 4 is arranged on substantially the same plane as the ceiling 3 . [0004] A square air intake grill 5 is provided at the center of the intake / exhaust panel 4 . Furthermore, inside the main body casing 2 , a bell mouth 6 for the turbo fan 11 is provided on the rear side of the air suction grill 5 . In the intake / e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/30F24F1/00F04D29/28
CPCF04D29/30F04D29/282
Inventor 岩田透郑志明
Owner DAIKIN IND LTD
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