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Fan

Inactive Publication Date: 2019-07-04
NIDEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text discusses a problem with the conventional way of manufacturing an axial flow fan's impeller. The method can lead to fatigue fractures in the resin impeller hub when there is a difference in expansion between the hub and the metal rotor yoke due to changes in ambient temperature. The technical effect of the patented method is to reduce the likelihood of such fractures and improve the stability and durability of the fan's impeller.

Problems solved by technology

However, in the configuration and manufacturing method of the impeller of the conventional axial flow fan, in order to fix the impeller hub and the rotor yoke to each other by insert molding, there is a possibility that a fatigue fracture is generated in the resin impeller hub when an ambient temperature of the axial flow fan changes due to a difference between a linear expansion coefficient of the resin impeller hub and a linear expansion coefficient of the metal rotor yoke.

Method used

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first embodiment

[0032]A fan FN according to the present disclosure will be described with reference to FIGS. 1 to 7. The fan FN will be described below with reference to FIG. 1. FIG. 1 is a perspective view illustrating the fan FN. In FIG. 1, the fan FN is viewed from above. As illustrated in FIG. 1, the fan FN includes an impeller PL, a motor MT, and a frame FR. The fan FN is an axial flow type fan that sends air toward the axial direction DA by rotation of the impeller PL. The frame FR accommodates the impeller PL and the motor MT. In the impeller PL, a plurality of blades 10 are arranged in the circumferential direction DC around the center axis AX. The motor MT rotates the impeller PL around the center axis AX. As a result, the impeller PL sends out air in the axial direction DA.

[0033]The impeller PL will be described below with reference to FIGS. 1 and 2. FIG. 2 is a perspective view illustrating the impeller PL. In FIG. 2, the impeller PL is viewed from below. As illustrated in FIGS. 1 and 2,...

second embodiment

[0114]The fan FNA will be described with reference to FIGS. 18 and 19A. FIG. 18 is a sectional view illustrating the fan FNA of the As illustrated in FIG. 18, an impeller PLA of the fan FNA includes an impeller plate 13A. The rotation shaft SH is fixed to the impeller plate 13A. The rotor RT of the motor MT of the fan FNA includes a rotor plate 23A.

[0115]FIG. 19A is a plan view illustrating the rotor plate 23A. As illustrated in FIGS. 18 and 19A, the rotor plate 23A has the substantially circular hole 233A. The hole 233A includes a through-hole 235A penetrating the rotor plate 23A. The hole 233A is opposed to a leading end 231a of the plate spring 231. That is, the leading end 231a of the plate spring 231 faces the through-hole 235A of the hole 233A. The leading end 231a of the plate spring 231 protrudes toward the center axis AX with respect to an edge 2333 of the hole 233A.

[0116]The protrusion 19A and the plate spring 231 will be described below with reference to FIGS. 18 to 19B....

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Abstract

A fan includes an impeller including an impeller plate and a motor including a rotor with a rotor plate. A protrusion of the impeller plate protrudes downward in an axial direction from a lower surface on a lower side in the axial direction toward the rotor plate. A plate spring of the rotor plate extends in a direction intersecting the axial direction and is bendable in the axial direction. At least a portion of the protrusion is accommodated in a hole of the rotor plate. The protrusion contacts a leading end of the plate spring while being accommodated in the hole. The plate spring is bent in the axial direction while the protrusion is in contact with the leading end of the plate spring.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of priority to Japanese Patent Application No. 2017-253814 filed on Dec. 28, 2017. 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 fan.2. Description of the Related Art[0003]A configuration and a manufacturing method of a conventional axial flow fan impeller will be described below. In manufacturing an impeller, a rotation shaft made of metal material is fixed to a rotor yoke. After the rotor yoke to which the rotation shaft is fixed is set in a metal mold for resin molding, insert molding is performed by injecting molding synthetic resin into the metal mold. An impeller hub is formed while an outer circumferential surface of a cylindrical unit of the cup-shaped rotor yoke is covered with the synthetic resin, and a plurality of blades are formed outside the impeller hub.[0004...

Claims

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Application Information

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IPC IPC(8): F04D13/02F04D13/06F04D29/18F04D29/32
CPCF04D13/021F04D13/06F04D29/181F04D29/186F04D29/329F04D29/263F04D29/325F04D29/646F04D25/064
Inventor ADACHI, MASAKI
Owner NIDEC CORP