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Propeller fan

A technology for propellers and fans, applied in the field of propeller fans, can solve the problems of rising blast sound level and inability to solve discomfort, and achieve the effects of suppressing noise increase, suppressing discomfort, and suppressing vibration

Active Publication Date: 2020-01-24
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, in the propeller fan of Patent Document 1, even if the discomfort caused by the NZ noise can be reduced, the overall level of the blowing sound will increase, and eventually the problem of the discomfort caused by the noise may not be solved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0039] The first embodiment will be described. The propeller fan 10 of this embodiment is an axial flow fan. The propeller fan 10 is installed, for example, in a heat source unit of an air conditioner, and is used to supply outdoor air to a heat source side heat exchanger.

[0040] -Structure of Propeller Fan-

[0041] Such as figure 1 As shown, the propeller fan 10 of this embodiment includes a hub 15 and three blades 20a, 20b, 20c. One hub 15 is integrally formed with three blades 20a to 20c. The propeller fan 10 is made of resin.

[0042] The hub 15 is formed in a cylindrical shape with a closed front end. The hub 15 is mounted on the drive shaft of the fan motor. The center axis of the hub 15 is the rotation center axis 11 of the propeller fan 10 .

[0043] The blades 20 a to 20 c are arranged to protrude outward from the outer peripheral surface of the hub 15 . The three blades 20 a to 20 c are arranged at predetermined intervals in the circumferential direction o...

no. 2 approach

[0087] A second embodiment will be described. In the propeller fan 10 of the present embodiment, the shapes of the blades 20 a to 20 c are changed from the propeller fan 10 of the first embodiment. Here, differences between propeller fan 10 of the present embodiment and propeller fan 10 of the first embodiment will be described.

[0088] Such as Figure 4A ~ Figure 4CAs shown, swelling portions 45a, 45b, and 45c are formed on the blades 20a to 20c of the present embodiment. The bulging portions 45a to 45c are portions swollen toward the positive pressure surfaces 25a to 25c of the blades 20a to 20c, and extend along the leading edge portions 41a to 41c across the entire length of the leading edge portions 41a to 41c. The surfaces of the raised portions 45a to 45c are convex surfaces that are smoothly connected to the surfaces of the regions adjacent to the raised portions 45a to 45c of the blades 20a to 20c. The shapes of the swelling parts 45a to 45c of the respective blad...

other Embodiment approach

[0091] In the propeller fan 10 of each of the above-mentioned embodiments, the number of the blades 20 a to 20 c may be an odd number of five or more. Moreover, in the propeller fan 10 of each embodiment mentioned above, the number of blades 20a-20c may be an even number.

[0092] In addition, the propeller fan 10 of each of the above-mentioned embodiments may be such that not all blades but some blades have different circumferential angles and masses.

[0093] Furthermore, in the propeller fan 10 according to the first embodiment described above, the shapes of the respective arcs 32 a to 32 c of the respective blades 20 a to 20 c and the respective projections on a plane perpendicular to the rotation central axis 11 of the propeller fan 10 The shape in the drawing and the shapes of the respective front edge portions 41 a to 41 c may be consistent with each other. Regarding the "shape of the arcs 32a to 32c", "shape of the projected view projected on a plane perpendicular to ...

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Abstract

In a propeller fan (10), circumferential direction pitches Phi1, Phi2, Phi3 of respective blades (20a, 20b, 20c) are mutually different. The masses of each blade (20a to 20c) differ from one another such that the center of gravity of the propeller fan (10) is positioned on a central axis of rotation (11) of the propeller fan (10). The thicknesses of main body blade portions (42c) of each blade (20a to 20c) are mutually different. Meanwhile, the shape of a blade cross section camber line of each blade (20a to 20c), the shape of a projection view of each blade onto a plane orthogonal to the central axis of rotation (11) of the propeller fan (10), and the shape of respective leading edge portions (41a to 41c) are each the same as one another. As a result, the propeller fan (10) having suppressed noise and vibration can be achieved.

Description

technical field [0001] The present invention relates to a propeller fan used in blowers and the like. Background technique [0002] Heretofore, propeller fans have been widely used for blowers and the like. The noise generated by the rotation of the propeller fan includes a periodic sound called NZ noise (NZ noise). The frequency of the NZ noise is the product of the number of blades and the rotational speed of the propeller fan. Patent Document 1 discloses a technique of arranging blades at unequal pitches in the circumferential direction of a propeller fan in order to suppress discomfort of a user or the like caused by the NZ noise. [0003] Here, if blades of the same mass are arranged at unequal intervals in the circumferential direction of the propeller fan, the rotation of the propeller fan will lose balance. Specifically, the center of gravity of the propeller fan is separated from the central axis of rotation of the propeller fan. Furthermore, if the propeller fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/32F04D29/38F04D29/66
CPCF04D29/328F04D29/327F04D29/666F04D29/662F04D29/384F05D2240/301F05B2240/301F05B2260/96
Inventor 岩田透富冈洋峻丸山要
Owner DAIKIN IND LTD
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