FAN BLADE ASSEMBLY
A fan blade assembly includes a fan blade body, which has an axle housing downwardly suspending in a center accommodation open chamber thereof at the center and defining therein an axle hole and an inside annular flange in the axle hole, and a core shaft, which is inserted into the axle hole of the axle housing to support magnetic levitation rotation of the fan blade body and has a coupling groove extending around the periphery thereof and coupled to the inside annular flange of the axle housing with a gap left therebetween.
Latest Patents:
This application claims the priority benefit of Taiwan patent application number 096217239 filed on Oct. 15, 2007.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates to an electric fan and more specifically, to fan blade assembly, which facilitates accurate installation of the core shaft in the fan blade body for enabling the core shaft to support magnetic levitation rotation of the fan blade body stably.
2. Description of the Related Art
Cooling fans are intensively used in different electronic apparatus for quick dissipation of heat energy. When the mechanical operation speed of a cooling fan is increased, the noise level resulted from friction between the core shaft and the axle bearing is relatively increased. Excessive high temperature during operation of a cooling fan may cause burnout of the component parts.
The present invention has been accomplished under the circumstances in view. It is therefore the main object of the present invention to provide a fan blade assembly, which facilitates accurate installation of the core shaft in the fan blade body for enabling the core shaft to support magnetic levitation rotation of the fan blade body stably.
To achieve this and other objects of the present invention, the fan blade assembly comprises a fan blade body and a core shaft. The fan blade body comprises a center accommodation open chamber and an axle housing downwardly suspending in the center accommodation open chamber at the center. The axle housing has an axle hole axially and downwardly extending to its bottom side, and an inside annular flange transversely extending around the inside wall and suspending in the axle hole. The core shaft is inserted into the axle hole of the axle housing to support rotation of the fan blade body on the core shaft, having a coupling groove extending around the periphery and coupled to the inside annular flange of the axle housing.
Referring to
The fan blade body 2 has an accommodation open chamber 22 disposed at the center and facing one side, namely, the bottom side, a plurality of radial blades 21 equiangularly spaced around the peripheral wall of the accommodation open chamber 22, a metal guide plate 23 mounted on the inner surface of the peripheral wall of the accommodation open chamber 22, a plurality of permanent magnets 24 affixed to the metal guide plate 23, a locating hole 26 located at the center of the top wall of the accommodation open chamber 22 and disposed outside the accommodation open chamber 22 for accommodating a magnetic member 27 (see
Referring to
Referring to
Referring to
Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
Claims
1. A fan blade assembly comprising:
- a fan blade body, said fan blade body comprising a center accommodation open chamber and an axle housing downwardly suspending in said center accommodation open chamber at the center, said axle housing having an axle hole axially and downwardly extending to a bottom side thereof and an inside annular flange transversely extending around an inside wall and suspending in said axle hole; and
- a core shaft inserted into said axle hole of said axle housing to support rotation of said fan blade body on said core shaft, said core shaft having a coupling groove extending around the periphery thereof and coupled to said inside annular flange of said axle housing.
2. The fan blade assembly as claimed in claim 1, wherein said fan blade body comprises a locating hole on an outside wall thereof in axial alignment with said axle hole of said axle housing, and a magnetic member mounted in said locating hole to attract said core shaft.
3. The fan blade assembly as claimed in claim 1, wherein said coupling groove is coupled to said inside annular flange with a gap about 0.1 mm left therebetween.
4. A fan blade assembly comprising:
- a fan blade body, said fan blade body comprising a center accommodation open chamber, an axle housing downwardly suspending in said center accommodation open chamber at the center, said axle housing having an axle hole axially and downwardly extending to a bottom side thereof and an annular stop flange at the bottom side within said axle hole;
- an axle bearing mounted in said axle hole inside said axle housing;
- a core shaft inserted through said axle bearing in said axle hole of said axle housing of said fan blade body to support rotation of said fan blade body on said core shaft, said core shaft having a coupling groove extending around the periphery thereof; and
- a retainer ring mounted in said axle hole inside said axle housing between said annular stop flange of said axle housing and said axle bearing and coupled to said coupling groove of said core shaft to secure said core shaft to said axle housing.
5. The fan blade assembly as claimed in claim 4, wherein said retainer ring is coupled to said coupling groove with a gap about 0.1 mm left therebetween.
6. The fan blade assembly as claimed in claim 4, wherein said axle bearing is a slide bearing.
7. The fan blade assembly as claimed in claim 4, wherein said axle bearing is a ball bearing.
8. The fan blade assembly as claimed in claim 4, wherein said fan blade body comprises a locating hole extending through a top wall of said center accommodation open chamber and axially connected to said axle hole of said axle housing, and a magnetic member mounted in said locating hole and stopped against said core shaft.
Type: Application
Filed: Dec 4, 2007
Publication Date: Apr 16, 2009
Applicant: (Taipei City)
Inventor: Ming-Shing Kao (Taipei)
Application Number: 11/949,784
International Classification: F01D 5/34 (20060101); F01D 25/28 (20060101);