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Multi-blade fan

A multi-blade and fan technology, which is applied to the components of pumping devices for elastic fluids, non-variable-capacity pumps, machines/engines, etc., can solve the problems of insufficient suppression effect of impeller 5 and large eddy currents.

Active Publication Date: 2010-03-03
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in such a conventional multi-blade fan, the vortex generated from the blades 9 of the impeller 5 is still large, and there is a problem that the suppressing effect of the noise generated by the impeller 5 is not sufficient, and further noise reduction is required.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0026] figure 1 It is an overall configuration diagram of the multi-blade fan according to the first embodiment of the present invention. The casing 21 has a spiral shape, has a flared orifice 22 formed on one side of the central portion, and has a suction port 23 and a discharge port 24 . An impeller 25 is arranged inside the casing 21 and is driven by a motor 26 . The impeller 25 includes a plurality of blades 29 supported at both ends in the axial direction by a main plate 27 and a side plate 28 . The air sucked in from the suction port 23 is guided to the air supplied to the impeller 25 as an inflow 30 as indicated by an arrow.

[0027] figure 2 A cross-sectional view in a direction perpendicular to the rotation axis of the blade 29 is shown. As for the blades 29, a plurality of blades 29 of the same shape are spaced apart at equal intervals and arranged in a ring shape. Each blade 29 has a shape as shown in the figure, has a leading edge 31 and a trailing edge 32 ,...

no. 2 approach

[0034] image 3 It is a cross-sectional view of the blade 29a of the multi-blade fan according to the second embodiment of the present invention. In addition, the same numerals are assigned to the same parts as those in the first embodiment, and detailed description thereof will be omitted.

[0035] The air guided by the orifice 22 flows in the form of the inflow 30a and the outflow 35a as shown by the arrows, but the stripping vortex at the back surface 33a is suppressed by the prescribed shape of the back surface, thereby reducing the generation of eddies and reducing turbulence. effect of noise.

[0036] Such as image 3 As shown, the shape of the back surface of the cross section perpendicular to the rotation axis of the blade 29a is formed into a predetermined shape so that the main flow flows along the blade back surface 33a from the leading edge 31a toward the trailing edge 32a of the blade 29a. That is, the shape of the back surface 33a has a thin-walled portion 36a...

no. 3 approach

[0041] Figure 4It is a perspective view of the main part of the multi-blade fan according to the third embodiment of the present invention. In addition, the same numerals are assigned to the same parts as those of the first embodiment or the second embodiment, and detailed description thereof will be omitted.

[0042] Such as Figure 4 As shown, the impeller 25b includes a plurality of blades 29b supported at both ends in the axial direction by a main plate 27b and side plates 28b. The blade 29b is set in a predetermined shape with a predetermined length L1 in the axial direction from the main plate 27b. Here, the predetermined length L1 is not more than two-thirds and not less than one-third of the axial length of the blade 29b.

[0043] The predetermined shape of the predetermined length L1 is the same as the first embodiment, and the shape of the back surface has a thin portion 36b and a thick portion 37b from the front edge 31b toward the rear edge 32b. The thickness ...

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PUM

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Abstract

A multiblade fan, comprising a volute casing (21) having a bell mouth-like orifice (22) formed on one side thereof and having a suction port (23) and a discharge port (24), an impeller (25) having, inthe casing (21), a plurality of blades (29) pivotally supported, at both axial ends, on a main plate (27) and a side plate (28), and a motor (26) driving the impeller (25). The blades (29) are formedso that the shape of the cross section thereof vertical to the rotating axis is specified in a specified axial length, and a mainstream flows along the rear surface of the blades (29).

Description

technical field [0001] The invention relates to a multi-blade fan used in ventilation and air supply equipment, air conditioning equipment, dehumidifiers, humidifiers, air purifiers and the like. Background technique [0002] At present, this kind of multi-blade fan is used in homes or offices, for example, it is described in Japanese Patent Application Laid-Open No. 2002-168194. Below, for this multi-blade fan, refer to Figure 12 as well as Figure 13 Be explained. [0003] Figure 12 It is an overall view of a conventional multi-blade fan. The casing 1 is in a spiral shape, and a bell mouth-shaped orifice 2 is formed on one side of the central part, and is equipped with a suction port 3 and a discharge port. exit 4. An impeller 5 is arranged inside the casing 1 and is driven by a motor 6 . The impeller 5 includes a plurality of blades 9 supported at both ends in the axial direction by a main plate 7 and a side plate 8 . The air sucked in from the suction port 3 is gu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/30
CPCF04D29/30F04D29/282
Inventor 荻野和郎大森和也
Owner PANASONIC CORP
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