Thin motor-driven centrifugal blowing fan apparatus

• US 6,210,118 B1
• Filed: 05/26/1999
• Issued: 04/03/2001
• Est. Priority Date: 12/18/1998
• Status: Expired due to Fees

• Current Assignee: Nippon Keiki Works Limited
• Original Assignee: Nippon Keiki Works Limited
• Inventors: Terashima, Mikihiro, Egawa, Yoshihiro
• Primary Examiner(s): Look, Edward K.
• Assistant Examiner(s): McAleenan, James M
• Application Number:
  US09/320,215
• Time in Patent Office: 678 Days
• Field of Search: 416/183, 416/185, 416/223 B, 416/228, 416/237, 416/DIG. 5, 416/175, 416/203, 417/354
• US Class Current: 416/243
• CPC Class Codes: F04D 29/281 for fans or blowers
• CPC Class Codes: F04D 29/384 characterised by form
• CPC Class Codes: Y10S 416/02 Formulas of curves

Abstract

A thin motor-driven centrifugal blowing fan apparatus draws in air in a rotation-axis direction and discharges the air in a radial direction. In this fan apparatus, blades are fitted on a peripheral face of a rotor, and each section of the blades in the vicinity of the peripheral face is implanted at an acute angle to the rotation direction so as to form an axial blade section. A section extending from the axial blade section is arranged perpendicular to the rotation direction so as to form a centrifugal blade section.

Claims

1. A thin, motor-driven centrifugal blowing fan apparatus provided in a housing with an inlet, an outlet and bottom face for drawing in air in the direction of an axis of rotation and discharging the air through the outlet substantially perpendicular to the axis of rotation, comprising:

a rotor centrally located on the axis of rotation and rotating about the axis of rotation in a rotational direction;

a plurality of axial blade sections disposed around a peripheral portion of said rotor and individually arranged at predetermined acute angles to said rotational direction; and

a like plurality of centrifugal blade sections, each of said centrifugal blade sections extending from a corresponding axial blade sections and individually arranged substantially at an angle of 90 degrees to said rotational direction through the entirety of a tip of the centrifugal blade section, each of said centrifugal blade sections and said axial blade sections having a bottom edge positioned parallel to the bottom face of the housing.

2. A thin, motor-driven centrifugal blowing fan apparatus according to claim 1, wherein a height of each of said axial blade sections is not greater than a height of each of said centrifugal blade sections.

3. A thin, motor-driven centrifugal blowing fan apparatus according to claim 1, wherein a height of each of said axial blade sections and a height of each of said centrifugal blade sections are the same.

4. A thin, motor-driven centrifugal blowing fan apparatus according to claim 1, further comprising gradually twisted blade sections transformed from said axial blade sections to said centrifugal blade sections so as to be bent from the predetermined acute angle of said axial blade sections to the angle of said centrifugal blade sections.

5. A thin, motor-driven centrifugal blowing fan apparatus according to claim 1, wherein said predetermined acute angles are in the range from about 40 to about 50 degrees.

6. A thin, motor-driven centrifugal blowing fan apparatus according to claim 1, wherein a diameter of said axial blade sections and a diameter of said centrifugal blade sections extending therefrom are larger than a diameter of the inlet in the housing.

7. A thin, motor-driven centrifugal blowing fan apparatus according to claim 1, wherein a ring is provided at the bottom edge of the terminus of said centrifugal blade sections furthest from said axial blade sections.

8. A thin, motor-driven centrifugal blowing fan apparatus provided in a housing with an inlet, an outlet and a bottom face for drawing in air in the direction of an axis of rotation and discharging the air in a direction substantially perpendicular to the rotation axis, comprising:

a rotor centrally located on the axis of rotation and rotating about the axis of rotation in a rotational direction;

a plurality of axial blades disposed around and extending from a peripheral portion of said rotor and individually arranged at predetermined acute angles to said rotational direction;

a ring fixed to said an outermost bottom edge of said axial blades; and

a plurality of centrifugal blades disposed separately from said axial blades and on the face of said ring substantially at an angle of 90 degrees to said rotational direction.

9. A motor-driven centrifugal blowing fan apparatus according to claim 8, wherein said predetermined acute angle are in the range from about 40 to about 50 degrees.

10. A motor-driven centrifugal blowing fan apparatus according to claim 8, wherein a diameter of an assembly of said blades is larger than a diameter of the inlet in the housing.

11. A motor-driven centrifugal blowing fan apparatus according to claim 8, wherein a height of said axial blades and a height of said centrifugal blades are the same.