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Impeller And Impeller With Axial Flow Fan

An impeller and blade technology, applied in the field of impellers and axial flow fans with it, can solve the problems of product reliability reduction, excessive stress, abnormal vibration, etc.

Inactive Publication Date: 2017-03-08
HITACHI IND EQUIP SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, abnormal vibration and excessive stress due to the resonance phenomenon occur, and the reliability of the product is significantly reduced

Method used

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  • Impeller And Impeller With Axial Flow Fan
  • Impeller And Impeller With Axial Flow Fan
  • Impeller And Impeller With Axial Flow Fan

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Hereinafter, an embodiment will be described using the drawings.

[0027] figure 1 It is a figure which shows the impeller of Example 1 and the axial flow fan which has it. figure 1 (a) A side view showing a partial section, figure 1 (b) shows a front view.

[0028] exist figure 1 Among them, 1 is the motor (motor), 2 is the rotating shaft, 3 is the impeller, 4 is the blade (blade), 5 is the hub (boss) part, 6 is the hub (hub) part, 7 is the washer (washer), 8 Is a bolt, and 9 is an aluminum plate.

[0029] The motor 1 is, for example, an induction motor driven at a variable speed by VVVF (Variable Voltage Variable Frequency) inverter power supply, and a propeller impeller 3 is attached to its rotating shaft 2 to constitute the main part of the axial fan 100 .

[0030] Although figure 1 Although not shown, the impeller 3 is covered by a case having a substantially cylindrical member called a pipe or a shroud, and the motor 1 is held by the case.

[0031] The impe...

Embodiment 2

[0055] Hereinafter, the impeller of Example 2 will be described. Embodiment 2 is different from Embodiment 1 in changing the shape of the aluminum plate, and the other basic structures of the impeller and axial flow fan are the same as Embodiment 1. The same applies to Examples 3 and 4.

[0056] exist image 3 The structure of the junction body 20 of the blade 24 and the aluminum plate 29 provided in the impeller of Example 2 is shown. in addition, image 3 shows the structure of one joint body 20 among the plurality of joint bodies 20 (blades 24 ), Figure 4 , 5 It's the same.

[0057] The aluminum plate 29 of the second embodiment is formed narrower than the width of the blade 24, and extends a predetermined length in the radial direction of the blade 24 from the root 22 of the blade 24 (the boundary portion between the blade 24 and the hub member 25) along the centerline 21 of the blade 24. . That is, the aluminum plate 29 is installed so as not to reach the tip of t...

Embodiment 3

[0061] Next, the impeller of Example 3 will be described. exist Figure 4 The structure of the junction body 30 of the blade 34 and the aluminum plate 39 provided in the impeller of Example 3 is shown.

[0062] The aluminum plate 39 of Example 3 is formed to have approximately the same width as the width from the leading edge portion 31 to the trailing edge portion 32 of the blade 34 , and the width from the root portion 33 of the blade 34 (the boundary portion between the blade 34 and the hub member 35 ) is formed at the edge of the blade 34 . Extend radially to a specified length. That is, the aluminum plate 39 is installed so as not to reach the tip of the blade 34 .

[0063] By disposing the aluminum plate 39 from the root portion 33 of the blade 34 , it is possible to make the bonded body 30 less likely to be twisted. In addition, by forming the aluminum plate 39 to have substantially the same width as the width from the front edge portion 31 to the rear edge portion 3...

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Abstract

The invention provides an impeller and an axial flow fan with the impeller capable of obtaining high reliability with less occurrence of abnormal vibration. The impeller comprises blades (4) which are radially provided on the outer peripheral surface of a cup-shaped boss member(5) and an aluminum plate (9) which is partially arranged on the surface of the blade (4).

Description

technical field [0001] The present invention relates to an impeller and an axial fan with it. Background technique [0002] Axial flow fans sometimes generate large vibrations during operation or at a specific rotational speed (rotational speed). This is a resonance phenomenon caused by the resonant frequency, which is an eigenvalue, of the impeller of the axial flow fan and the operating frequency of the axial flow fan. In the case of a propeller impeller, since the blade is supported by a single arm, the influence of resonance is significant. [0003] As an industrial propeller impeller, a structure in which a blade of a metal plate is attached to a hub portion is generally used. As such impellers, there are known a welded impeller in which blades are welded to a hub and a caulked impeller in which blades are caulked to a hub. Among them, since the blades of the welded impeller have the same thickness, the stress acting on the attachment portion of the blade tends to in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/32F04D29/38F04D29/66
CPCF04D29/325F04D29/388F04D29/666F04D29/668
Inventor 石田恒武田谕冈田幸司
Owner HITACHI IND EQUIP SYST CO LTD
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