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Through-flow fan, air blower, and air conditioner

A technology of cross-flow fans and air passages, applied in the field of cross-flow fans, can solve the problems of increasing length and the influence of fan power consumption and air supply performance, and achieve uniform distribution of wind speed, low noise, and low input. Effect

Active Publication Date: 2012-09-19
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Along with this, the shaft of the cross-flow fan used in the air conditioner becomes longer, and the three-dimensional air flow in the axial direction of the fan becomes stronger, which greatly affects the fan's power consumption, noise generation, and other air supply performance.

Method used

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  • Through-flow fan, air blower, and air conditioner
  • Through-flow fan, air blower, and air conditioner
  • Through-flow fan, air blower, and air conditioner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0058] figure 1 (a) is a perspective view showing the appearance of cross-flow fan 1 according to Embodiment 1 of the present invention. A plurality of blades 3 supported at both ends by the ring 2 are attached in the circumferential direction of the ring 2 . A plurality of impeller units 4 (hereinafter, referred to as one unit) composed of the ring 2 and the blades 3 are connected in the axial direction of the fan, thereby constituting the cross-flow fan 1 . figure 1 (b) is a front view of main parts of the impeller unit 4 . like figure 1 As shown in (b), the outer diameter formed by the outer edge portion of the blade 3 is constant in the axial direction of the cross-flow fan 1 . figure 1 (c) is a figure which shows the longitudinal section of the impeller of one unit. The ring outer diameter 5 is larger than the outer diameter of the vanes 3 , and the vanes 3 are radially engaged and fixed to the ring 2 at positions inside the outer circumference of the ring 2 . In add...

Embodiment approach 2

[0077] In Embodiment 1, the increase or decrease of the blown air volume is changed by the curvature of the blades, and the air volume may be changed by the chord length of the blades below.

[0078] Figure 5 It is a vertical cross-sectional view of the cross-flow fan 1 according to the second embodiment. As in Embodiment 1, the impeller cross section of one unit is divided into a unit end portion (a) and a unit center portion (b) and shown. Focusing on the cross-section of the blade, it is characterized in that the blade chord length 23b at the center of the unit is longer than the blade chord length 23a at the end of the unit with respect to the straight line (blade chord length 23) connecting the front end of the blade and the rear end of the blade (23a<23b) .

[0079] In addition, similar to Embodiment 1, in the cross section of the blade, the exit angle 26a (or 26b) at the intersection point 25 where the blade centerline 6a (or 6b) intersects the arc 24 of the blade ou...

Embodiment approach 3

[0086] The configurations shown so far are examples in which the shape of the blades varies in the width direction between one impeller unit. When the shape of the blade is changed in the width direction, if the change is sudden, a step difference may be generated on the blade surface, eddy current may be generated on the surface, pressure fluctuation may be increased, and noise may be deteriorated.

[0087] Figure 6 (A) is a front view of the cross-flow fan of Embodiment 3, Figure 6 (B) is Figure 6 (A) Perspective view of cross-flow fan in region (ab) part. In Embodiment 3, a region (ab) is provided in which a continuous inclined surface is formed between the region (a) and the region (b) of the impeller, whereby between the region (a) and the region (b), the The mode changes smoothly without causing a step difference on the blade surface.

[0088] According to Embodiment 3, since the step difference on the surface of the blade disappears, there is an effect that gener...

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Abstract

Provided are a through-flow fan wherein the wind speed distribution in the direction of a fan shaft at the outlet of an air passage is unified, and separation of airflow is reduced on the suction side of the fan, so that inputs and noise can be reduced, and an air blower and an air conditioner using the through-flow fan. The through-flow fan is provided with a plurality of annular rings which are rotatably disposed within a long transverse air passage and which are provided substantially parallel, and a plurality of blades having an arched section, which are radially provided between the adjacent rings. The angle of warpage of each blade in the ring-side portion of the blade is smaller than that in the center of the blade in the longitudinal direction between the rings.

Description

technical field [0001] The present invention relates to a cross-flow fan used in an indoor unit of an air conditioner, a blower and an air conditioner using the cross-flow fan. Background technique [0002] In recent years, blowers and air conditioners have increased in the number of models with a wide box (fan axial direction) in order to cope with spacious rooms. Along with this, the shaft of the cross-flow fan used in the air conditioner also becomes longer, and the three-dimensional airflow in the axial direction of the fan becomes stronger, which greatly affects the fan's power consumption, noise generation, and other air supply performance. [0003] As a prior art that realizes low input and low noise of blower using a cross-flow fan, for example, there is an example in which a rectifying plate is provided on the wall surface of the blower to make the blowing air velocity distribution uniform (for example, Patent Document 1) . In addition, in order to suppress the ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D17/04F04D29/66
CPCF04D29/30F04D17/04F04D29/283
Inventor 田所敬英池田尚史
Owner MITSUBISHI ELECTRIC CORP
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