Fans and motors

The fan device with radially movable blades and a spring member addresses the challenge of balancing airflow and noise by adjusting its diameter in response to rotational speed, enhancing performance and reducing complexity.

JP7882683B2Active Publication Date: 2026-06-30TOSHIBA IND PROD & SERVICES CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
TOSHIBA IND PROD & SERVICES CORP
Filing Date
2022-05-10
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing fan devices face challenges in achieving both sufficient airflow and reduced noise depending on rotational speed, with mechanisms for adjusting fan blade angles complicating the structure and increasing weight.

Method used

A fan device with radially movable blades and a spring member that adjusts the fan's outer diameter based on rotational speed, utilizing airflow reaction forces to simplify the structure and reduce weight while ensuring airflow and noise reduction.

Benefits of technology

The fan device achieves both sufficient airflow at low speeds and reduced noise at high speeds by adjusting its outer diameter in response to rotational speed changes, simplifying the structure and reducing weight.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

To provide a fan device that has a simple structure, is lightweight, and can both secure an air flow rate depending on the rotational speed and reduce noise, and a motor using the fan device.SOLUTION: A fan device 10 according to an embodiment has a fan body 41, a groove 42, a fan blade 43, and a spring member 44. The fan body 41 rotates in one direction with the rotor. The groove 42 is provided in the fan body 41 and extends outward from the center in the radial direction. The fan blade 43 is movable in the groove 42 in the radial direction. The spring member 44 applies a pushing force to the fan blade 43 outward in the radial direction as a pushing force. The fan blade 43 moves radially inward along the groove 42 when the moving force, which is the force applied radially inward by the air flow due to the increase in the rotation speed of the fan body 41, becomes larger than the pushing force of the spring member 44.SELECTED DRAWING: Figure 1
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