Fan

• Main Authors: HIRONO TEIICHI, NODA SHINICHIRO, HASEGAWA TOMOHIRO, FUJIMOTO MASAFUMI, IKEGAMI YOSHIHARU
• Format: Patent
• Language: Chinese; English
• Published: 02.01.2013
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT PUMPS; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; WEAPONS

A fan includes a motor and an impeller. The motor includes a stationary portion and a rotating portion. The stationary portion includes a stator and a bearing portion. The bearing portion includes a sleeve made of a metal sintering body and a bearing housing covering the outer periphery of the sleeve. The rotating portion includes a rotor magnet, a shaft inserted in the sleeve, and a thrust plate extending from the lower end of the shaft to the radial external side. A radial gap between the inner periphery of the sleeve and the outer periphery of the shaft includes a radial dynamic pressure bearing portion arranged to generate a fluid dynamic pressure acting axially downward on a lubricating oil, while an axial gap between the lower surface of the sleeve and the upper surface of the thrust plate includes an axial dynamic pressure bearing portion arranged to generate a fluid dynamic pressure acting radially inward on the lubricating oil. A circulation hole extending in an axial direction is defined between the