Structure of fan devices for leading out wires

Abstract

A lead wire is led out to a fan outer frame portion side through a lead wire retaining portion that is provided to a motor support portion of a housing that fixes a fan motor so as to protrude to a fan outer frame portion side or is provided to the fan outer frame portion of the housing so as to protrude to the motor support portion side. The lead wire retaining portion is positioned between neighboring support beams for fixing the motor support portion to the fan outer frame portion.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a structure of a fan device for leading out lead wires. Fan devices are used for various apparatuses such as office machines or home appliances. [0003] 2. Description of the Prior Art [0004] Fan devices are used widely in various apparatuses such as office machines or home appliances for cooling heat that is generated when the apparatuses operate. In particular, a personal computer or a server device requires a high efficiency fan device having a small size and being capable of supplying large quantity of air in proportion to the processing speed and the requirement for smaller size thereof, which make a CPU chip and other ICs generate more heat during operation. A fan device usually comprises a fan motor, a housing and a printed circuit board. The fan motor comprises a motor for generating a driving force and an impeller that is rotated by the driving force for generating a cooling ...

AI Technical Summary

Benefits of technology

[0009] An object of the present invention is to provide a fan device that is capable of supplying a large quantity of air and has a small windage loss. Another object of the present invention is to provide a fan device that can retain lead wires simply and minimize a windage loss.

[0012] In this fan device, the lead wires are not housed in the support beam but passes through a space between the motor support portion and the fan outer frame portion nakedly. Therefore, the support beam can reduce its width as much as possible within the range where sufficient strength is secured. In addition, as the width of the support beam is reduced, air resistance of air that flows in the space between the motor support portion and the fan outer frame portion can be reduced so that air blow performance is improved. The lead wire is retained by the lead wire retaining portion that has a shape having a small windage loss. Therefore, a fan device is realized that has little possibility that lead wires contact the impeller and has a small windage loss.

[0014] In this fan device, the housing is made of a synthetic resin by injection modeling. One end of the support beam of the housing is linked to a substantial center of neighboring two side connecting corners of the fixing end plate portion. Therefore, a deformation at the substantial center portion can be minimized during cooling process that is a final stage of the injection modeling. Thus, the strength of the fan outer frame cylinder portion is enhanced so that the fan outer frame cylinder portion having a good circularity can be formed. As a result, as the circularity of the fan outer frame cylinder portion is high, an outer diameter of the impeller can be set to a value close to an inner diameter of the fan outer frame cylinder portion. Thus, the outer diameter of the impeller can be increased. For this reason, the capability of the impeller about air blowing can be improved. As the space between the impeller and the fan outer frame cylinder portion can be set narrower, air leakage quantity from the space can be reduced. Therefore, this fan device can realize a high efficiency of blowing air. In addition, the lead wires can be retained by the lead wire retaining portion that has a shape of small windage loss. Thus, a fan device having little possibility that lead wires contact the impeller and has a large quantity of air blow and a small quantity of windage loss.

Problems solved by technology

Therefore, a fan device is realized that has little possibility that lead wires contact the impeller and has a small windage loss.

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