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Centrifugal fan

a centrifugal fan and fan body technology, applied in the direction of radial flow pumps, non-positive displacement fluid engines, pump components, etc., can solve the problems of air inlet noise and reduced air-blowing performance of centrifugal fans

Inactive Publication Date: 2019-09-12
NIPPON DENSAN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present disclosure relates to a centrifugal fan with a unique design that includes a motor, impeller, circuit board, and casing. The impeller has multiple blade portions that extend radially outward, with an upper and lower shroud. The casing has an upper casing that covers the axially upper side of the impeller and includes a tubular portion and a disk-shaped portion with an air inlet. The disk-shaped portion also has at least one axially recessed portion. The technical effect of this design is better air flow and improved cooling efficiency of the centrifugal fan.

Problems solved by technology

However, the meeting of the air flows described above may cause noise to be generated at the air inlet due to an occurrence of turbulence.
Further, a reduction in air-blowing performance of the centrifugal fan may occur due to the intake of air through the air inlet being reduced by an occurrence of turbulence.

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0015]Hereinafter, example embodiments of the present disclosure will be described with reference to the accompanying drawings. It is assumed herein that a rotation axis of a motor 30 of a centrifugal fan 100 is referred to as a central axis P, and that a direction parallel to the central axis P is referred to by the term “axial direction”, “axial”, or “axially”. It is also assumed herein that a direction leading from a circuit board 40 to an impeller 10 is referred to as an axially upward direction, while a direction leading from the impeller 10 to the circuit board 40 is referred to as an axially downward direction. It is also assumed herein that a surface of any structural element which faces upward in an axial direction is referred to as an upper surface thereof, while a surface of any structural element which faces downward in the axial direction is referred to as a lower surface thereof. It is also assumed herein that an end portion of any structural element on an axially uppe...

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PUM

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Abstract

A centrifugal fan includes a motor including a rotor, an impeller fixed to the rotor to rotate together with the rotor, a circuit board electrically connected to the motor, and a casing to house the motor, the impeller, and the circuit board. The impeller includes blade portions spaced apart from one another in a circumferential direction and extending radially outward, an annular upper shroud to join axially upper portions of the blade portions, and an annular lower shroud to join axially lower portions of the blade portions. The casing includes an upper casing to cover an axially upper side of the impeller. The upper casing includes a tubular portion radially opposite to the upper shroud with a first gap therebetween, and an annular disk-shaped portion extending radially inward from the tubular portion and axially opposite to an axially upper end portion of the upper shroud with a second gap therebetween. The disk-shaped portion, including an air inlet defined radially inside thereof, includes an axially recessed portion recessed axially upward in a lower surface thereof.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of priority to Japanese Patent Application No. 2018-041586 filed on Mar. 8, 2018. The entire contents of this application are hereby incorporated herein by reference.BACKGROUND OF THE INVENTION1. Field of the Invention[0002]The present disclosure relates to a centrifugal fan.2. Description of the Related Art[0003]In a known centrifugal fan, an impeller including a plurality of blades arranged in a circumferential direction is housed between an upper plate and a lower plate of a casing. In the centrifugal fan, rotation of the impeller causes air to be sucked in through an air inlet defined in the upper plate of the casing, and to be blown out from an outer circumference of the impeller. An upper end of a cylindrical portion of the impeller is arranged to project from the casing, and is arranged to define a curved portion in the shape of a bell mouth which curves outwardly. Near the outer circumference of...

Claims

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Application Information

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IPC IPC(8): F04D29/66F04D29/16
CPCF04D29/667F04D29/162F04D25/06F04D17/16F04D29/666F04D15/00F04D25/08F04D29/281F04D29/30F04D29/4226F04D29/663F04D25/0613
Inventor HORII, YUYA
Owner NIPPON DENSAN CORP