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Turbofan, and indoor unit for air conditioning device

A turbo fan and corrugated technology, which is applied in the field of turbo fans and indoor units for air conditioning devices, can solve the problems of not being able to reduce noise and control the airflow of blades, and achieve the effect of low noise

Active Publication Date: 2017-08-18
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the technology shown in the above-mentioned Patent Document 1, there is a problem that a sufficient noise reduction effect cannot be obtained because the airflow on the main plate side of the blade cannot be controlled.

Method used

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  • Turbofan, and indoor unit for air conditioning device
  • Turbofan, and indoor unit for air conditioning device
  • Turbofan, and indoor unit for air conditioning device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0027] figure 1 It is a perspective view of the turbo fan according to Embodiment 1 of the present invention. figure 2 It is a side view of the turbo fan according to Embodiment 1 of the present invention. image 3 It is a figure which shows the blade|wing of the turbofan concerning Embodiment 1 of this invention.

[0028] like Figure 1 ~ Figure 3 As shown, the turbofan 100 according to Embodiment 1 includes: a hub 1 rotating around an axis O; a main board 2 connected to the hub 1; a shroud 3 having a suction port 31 for sucking air; and a plurality of blades 4 between the shroud 3 .

[0029] On the front edge portion 41 of each blade 4, a wave-shaped protrusion portion 41a is formed. The wavy protrusion 41a is formed by connecting a plurality of protrusions 42 .

[0030] The formation form of the plurality of protrusions 42 will be described using the pitch P. A pitch P is defined as a distance from a valley portion 421 of a protrusion 42 to a valley portion 421 of an...

Embodiment approach 2

[0039] Next, use Figure 5 Embodiment 2 of the present invention will be described. Figure 5 Regarding the turbofan according to Embodiment 2 of the present invention, figure 2 Partial sectional view of the V-V line. In addition, this Embodiment 2 is the same as the said Embodiment 1 except the content demonstrated below.

[0040] like Figure 5 As shown, in the turbofan according to the second embodiment, the wavy protrusions 141 a of the leading edge portion of the blade 104 are partially curved outward in the radial direction viewed from the axis O. As shown in FIG. In other words, the wavy protrusion 141 a of the leading edge portion of the blade 104 is partially curved toward the front in the rotation direction R of the fan. In addition, the wavy protrusion 141a is curved radially outward (towards the front in the rotation direction R) so as to deviate from the extending direction of the blade thickness centerline C of the blade 104 when the wavy protrusion 41a is n...

Embodiment approach 3

[0044] Next, use Figure 5 and Figure 6 Embodiment 3 of the present invention will be described. Figure 5 Regarding the turbofan according to Embodiment 3 of the present invention, figure 2 Partial sectional view of the V-V line. in addition, Figure 6 Regarding the turbofan according to Embodiment 3 of the present invention, figure 2 Partial sectional view of line VI-VI. In addition, this Embodiment 3 is the same as the said Embodiment 1 except the content demonstrated below.

[0045] Figure 6 shown figure 2 The line VI-VI in section shows the ratio Figure 5 shown figure 2 The section along the line V-V in is close to the section of the wavy protrusion 241a at the front edge of the blade 204 on the side of the main board 2 . Figure 6 The local bending amount of the wave-shaped protrusion 241a in the front edge portion of the blade 204 in the fan rotation direction is configured to be larger than Figure 5 The amount of local bending in the fan rotation dir...

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PUM

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Abstract

A turbofan (100) is provided with a boss (1) rotating about an axis (O); a main plate (2) connected to the boss (1); a shroud (3) having a suction opening (31); and a plurality of blades (4, 104, 204) arranged between the main plate (2) and the shroud (3). A wave-shaped protrusion (41a, 141a, 241a) is provided at the front edge (41) of each of the blades (4, 104, 204). Each of the wave-shaped protrusions (41a, 141a, 241a) includes a plurality of protrusions (42) which are formed so that the pitch thereof decreases toward the main plate (2).

Description

technical field [0001] The present invention relates to a turbo fan and an indoor unit for an air conditioner. Background technique [0002] As a technique for realizing low noise of a turbo fan, there is a structure disclosed in Patent Document 1, for example. The centrifugal blower disclosed in Patent Document 1 includes: an impeller including a main plate, a shroud, and a plurality of vane plates; a casing enclosing the impeller; and a suction bell mounted on the casing. A flat plate having the same thickness as the blade plate and having a triangular shape is integrally formed at the leading edge portion of the blade plate. One edge of the plate is in close contact with the shroud of the leading edge portion of the blade plate. With such a structure, the airflow sucked into the downstream side of the bell mouth quickly and smoothly flows into the vane plate, and the turbulence in the inflowing airflow is reduced, thereby reducing noise. [0003] In addition, for examp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/30
CPCF04D29/30F04D29/281F05D2240/303F05D2250/183F04D29/666F01D5/04F01D5/145
Inventor 中岛诚治佐藤芳树大石圭介
Owner MITSUBISHI ELECTRIC CORP