WATERPROOF FAN

• Main Authors: NISHIZAWA TOSHIYA, OGAWA NORIAKI, NAKAZAWA SATOSHI, ONOZAWA IZUMI
• Format: Patent
• Language: English; Japanese
• Published: 19.01.2023
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION

To provide a waterproof fan which prevents water from entering a circuit board even when heat stress repeatedly acts thereon.SOLUTION: A waterproof fan includes a rotor 2 having a rotation shaft part and a rotary vane rotatable around a rotation axial line X, a stator 3, a circuit board 7, a resin-made frame 6 having a storage space 64 for storing a circuit board 7, a waterproof resin part 8 which covers the stator 3 and blocks an opening of the storage space 64, a bearing 4 rotatably supporting the rotation shaft part around a rotation axial line X, and a metal-made bearing holder 5 which extends in the rotation axial line X, has a cylindrical shape and supports the bearing 4. The frame 6 has a cylindrical holder protective part 61 covering at least a part of the outer peripheral surface of the bearing holder 5, and the holder protective part 61 separates the stator 3 from the bearing holder 5.SELECTED DRAWING: Figure 2 【課題】熱応力が繰り返し作用しても回路基板に水が浸入しにくい防水ファンを提供する。【解決手段】防水ファンは、回転軸線Ｘ回りに回転可能な回転軸部と回転翼とを有するロータ２と、ステータ３と、回路基板７と、回路基板７を収容する収容空間６４を有する樹脂製のフレーム６と、ステータ３を覆い収容空間６４の開口を閉塞する防水樹脂部８と、回転軸部を回転軸線Ｘ回りに回転可能に支持する軸受４と、回転軸線Ｘに沿って延びる円筒状で軸受４を支持する金属製の軸受ホルダ５とを備える。フレーム６は、軸受ホルダ５の外周面の少なくとも一部を覆う筒状のホルダ保護部６１を有し、ホルダ保護部６１はステータ３を軸受ホルダ５から離間させている。【選択図】図２