Crossflow fan

A cross-flow fan, a part of the technology, applied in the field of cross-flow fans, can solve the problem of high noise at the end of the tongue area

Active Publication Date: 2007-05-02
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, the moment the blades (blades) of the fan rotor move from the tongue area to the air suction area, the air flow around the blades changes drastically, resulting in louder noise at the end of the tongue area

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0023] Fig. 1 is a cross-sectional view of an air conditioner using a cross-flow fan according to Embodiment 1 of the present invention. In the drawings, parts marked with the same symbol indicate the same or equivalent parts, and this is the case throughout the specification. In addition, the form of the structural element shown in the whole specification is an illustration, and is not limited to these descriptions.

[0024] In FIG. 1 , a front suction grill 2 is provided on the front of a housing 1 of the air conditioner, and a top suction grill 3 is provided on the upper surface. In the casing 1, along the front suction grille 2 and the upper suction grille 3, a filter 4 for removing dust contained in the air is provided, and along the filter 4, there is a filter 4 for the front suction grille 2 and the upper suction grille. A heat exchanger 5 for exchanging heat with the air sucked in by the suction grill 3 . At the front lower part of the housing 1, a protruding portion...

Embodiment approach 2

[0038] Embodiment 1 shows an air conditioner using a cross-flow fan in which at least some of the grooves have different depths H in the radial direction of the impeller 12 . Embodiment 2 of the present invention shows an air conditioner using a cross-flow fan in which at least some of the plurality of grooves have different lengths L in the circumferential direction of the impeller 12 .

[0039] 5 is a cross-sectional view of a protruding portion of a cross-flow fan according to Embodiment 2 of the present invention on a plane perpendicular to the rotation axis. 6 is a perspective view of a protruding portion of a cross-flow fan according to Embodiment 2 of the present invention.

[0040] As shown in FIGS. 5 and 6 , the cross section of the tongue 18 on the plane perpendicular to the circumferential direction of the impeller 12 (the plane including the rotating shaft 13 of the impeller 12 ) is comb-shaped. A plurality of grooves 22 are arranged in parallel in the direction o...

Embodiment approach 3

[0049] Embodiment 1 shows an air conditioner using a cross-flow fan in which at least some of the grooves have different depths H in the radial direction of the impeller 12 . Embodiment 3 of the present invention shows an air conditioner using a cross flow fan in which at least some of the plurality of grooves have different widths D in the direction of the rotation axis 13 of the impeller 12 .

[0050] 8 is a perspective view of a protruding portion of a cross-flow fan according to Embodiment 3 of the present invention.

[0051] As shown in FIG. 8 , the cross section of the tongue 18 on the plane perpendicular to the circumferential direction of the impeller 12 (the plane including the rotating shaft 13 of the impeller 12 ) becomes comb-shaped. A plurality of grooves 23 are arranged in parallel in the direction of the rotating shaft 13 . Some of the plurality of grooves 23 have different shapes, and also have different widths D in the direction of the rotating shaft 13 of th...

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PUM

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Abstract

According to an embodiment of the present invention, there is provided a crossflow fan includes: an impeller; and a tongue provided along a portion of the outer circumference of the impeller. The tongue is provided with a plurality of slits such that a cross-section of the tongue on a surface perpendicular to a circumferential direction of the impeller is formed in a comb shape. At least one slit of the plurality of slits is formed in a different shape.

Description

technical field [0001] The present invention relates to a cross flow fan used in air conditioners and the like. Background technique [0002] In order to improve the air blowing performance of a cross-flow fan used in an air conditioner or an air curtain, it is preferable to set the distance between the fan rotor (impeller) and the tongue at a predetermined height along the outer diameter of the fan rotor. Small. However, in this case, the moment the blades (blades) of the fan rotor move from the tongue area to the air suction area, the air flow around the blades changes drastically, resulting in louder noise at the end of the tongue area . [0003] Therefore, in the conventional cross-flow fan, in order to prevent the airflow around the blades from changing suddenly when the blades of the fan rotor move from the tongue area to the air suction area, a comb-shaped groove is provided at the upper end of the tongue. The width of the comb-shaped groove increases from the tong...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D17/04F04D29/44F24F1/00F24F1/0063
CPCF24F13/24F24F2001/0048F24F7/007F24F1/0025F24F1/0007F24F1/0057F24F1/0063
Inventor 山田彰二宮本照雄代田光宏谷川喜则田泽哲也
Owner MITSUBISHI ELECTRIC CORP
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