US20030138324A1 - Cooling fan - Google Patents

Cooling fan Download PDF

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Publication number
US20030138324A1
US20030138324A1 US10/053,643 US5364302A US2003138324A1 US 20030138324 A1 US20030138324 A1 US 20030138324A1 US 5364302 A US5364302 A US 5364302A US 2003138324 A1 US2003138324 A1 US 2003138324A1
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US
United States
Prior art keywords
cooling fan
rotor
top surface
cylindrical housing
outer periphery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/053,643
Inventor
Hsin-mao Hsieh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US10/053,643 priority Critical patent/US20030138324A1/en
Publication of US20030138324A1 publication Critical patent/US20030138324A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/329—Details of the hub

Definitions

  • the present invention is related to a cooling fan, and more particularly to a rotor of the cooling fan.
  • a conventional axial-flow cooling fan is composed of a rotor ( 50 ) and a stator (not shown or numbered).
  • the rotor ( 50 ) has a cylindrical housing ( 51 ) and a plurality of blades ( 52 ) radially formed on an outer periphery of the cylindrical housing ( 51 ).
  • FIG. 5 when the rotor ( 50 ) is driven to rotate, air flows along a top surface ( 53 ) of the cylindrical housing ( 51 ) and through the blades ( 52 ). As indicated by the arrows, there are airflows formed in the fan and discharged by the blades ( 52 ).
  • the top surface ( 53 ) has resistance that reduces a speed the airflow
  • a high-speed cooling fan must use a high power motor and needs an excessive size in relation to the task to be done.
  • the cooling fan usually is fitted in a computer which provides a limited space for the cooling fan, so that it is difficult to increase the size of the fan.
  • the invention provides an improved cooling fan to mitigate and/or obviate the aforementioned problems.
  • the main objective of the invention is to provide a cooling fan that can reduce a resistance to the airflow through the fan and provide an appropriate airflow speed without need for an excessively-sized fan.
  • FIG. 1 is a perspective view of a cooling fan in accordance with the invention
  • FIG. 2 is a top view of the cooling fan of the invention
  • FIG. 3 is a cross sectional view of the cooling fan of the invention.
  • FIG. 4 is a top view of a conventional cooling fan
  • FIG. 5 is a cross sectional view of the conventional cooling fan in FIG. 4.
  • a cooling fan in accordance with the invention includes a rotor ( 10 ) and a stator (not shown or numbered) received in the rotor.
  • the rotor ( 10 ) is composed of a cylindrical housing ( 11 ) and a plurality of blades ( 14 ).
  • the cylindrical housing ( 11 ) has an outer periphery ( 12 ) and a top surface ( 13 ).
  • the blades ( 14 ) are radially formed on the outer periphery ( 12 ).
  • the blades ( 14 ) each have a cambered upper surface (not numbered) formed thereon.
  • An identical plurality of cutouts ( 131 ) is defined at the edge of the outer periphery ( 12 ) and top surface ( 13 ) and between adjacent blades ( 14 ) respectively.
  • the cutouts ( 131 ) each have a triangular shape inclined outwards and downwards from the center of the top surface ( 13 ).
  • the circumferential portion of the top surface is lower than the central portion of the top surface ( 13 ).
  • An air intake of the cooling fan of the present invention is higher than that of the conventional cooling fan of the same size. Furthermore, a resistance to the airflow through the cooling fan is small and a wind generated by the cooling fan has a high speed.

Abstract

A cooling fan is composed of a rotor and a stator received in the rotor. The rotor has a cylindrical housing with an outer periphery and a top surface. The cylindrical housing has a plurality of cutouts defined at the edge of the outer periphery and the top surface and inclined outwards and downwards from the center of the top surface. A plurality of blades is radially formed on the outer periphery of the cylindrical housing and respectively between adjacent cutouts.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention [0001]
  • The present invention is related to a cooling fan, and more particularly to a rotor of the cooling fan. [0002]
  • 2. Description of Related Art [0003]
  • Referring to FIG. 4, a conventional axial-flow cooling fan is composed of a rotor ([0004] 50) and a stator (not shown or numbered). The rotor (50) has a cylindrical housing (51) and a plurality of blades (52) radially formed on an outer periphery of the cylindrical housing (51). Referring to FIG. 5, when the rotor (50) is driven to rotate, air flows along a top surface (53) of the cylindrical housing (51) and through the blades (52). As indicated by the arrows, there are airflows formed in the fan and discharged by the blades (52).
  • Because the top surface ([0005] 53) has resistance that reduces a speed the airflow, a high-speed cooling fan must use a high power motor and needs an excessive size in relation to the task to be done. However, the cooling fan usually is fitted in a computer which provides a limited space for the cooling fan, so that it is difficult to increase the size of the fan.
  • Therefore, the invention provides an improved cooling fan to mitigate and/or obviate the aforementioned problems. [0006]
    • SUMMARY OF THE INVENTION
  • The main objective of the invention is to provide a cooling fan that can reduce a resistance to the airflow through the fan and provide an appropriate airflow speed without need for an excessively-sized fan. [0007]
  • Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.[0008]
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a perspective view of a cooling fan in accordance with the invention; [0009]
  • FIG. 2 is a top view of the cooling fan of the invention; [0010]
  • FIG. 3 is a cross sectional view of the cooling fan of the invention; [0011]
  • FIG. 4 is a top view of a conventional cooling fan; and [0012]
  • FIG. 5 is a cross sectional view of the conventional cooling fan in FIG. 4.[0013]
    • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • Referring to FIG. 1, a cooling fan in accordance with the invention includes a rotor ([0014] 10) and a stator (not shown or numbered) received in the rotor.
  • The rotor ([0015] 10) is composed of a cylindrical housing (11) and a plurality of blades (14). The cylindrical housing (11) has an outer periphery (12) and a top surface (13). The blades (14) are radially formed on the outer periphery (12). The blades (14) each have a cambered upper surface (not numbered) formed thereon. An identical plurality of cutouts (131) is defined at the edge of the outer periphery (12) and top surface (13) and between adjacent blades (14) respectively.
  • Referring to FIGS. 2 and 3, the cutouts ([0016] 131) each have a triangular shape inclined outwards and downwards from the center of the top surface (13). Thus, the circumferential portion of the top surface is lower than the central portion of the top surface (13). When the rotor (10) is rotated, air above the top surface (13) can flow through the cutouts (131) and the blades (14) as indicated by arrows in FIG. 3. An air intake of the cooling fan of the present invention is higher than that of the conventional cooling fan of the same size. Furthermore, a resistance to the airflow through the cooling fan is small and a wind generated by the cooling fan has a high speed.
  • It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed. [0017]

Claims (2)

What is claimed is:
1. A cooling fan being composed of a rotor (10) and a stator received in the rotor (10), wherein the rotor (10) comprises
a cylindrical housing (11) with an outer periphery (12) and a top surface (13), the cylindrical housing (11) having a plurality of cutouts (131) defined at the edge of the outer periphery (12) and the top surface (13) and inclined outwards and downwards from the center of the top surface (13); and
a plurality of blades (14) radially formed on the outer periphery (12) of the cylindrical housing (11) and respectively between adjacent cutouts (131).
2. The cooling fan as claimed in claim 1, wherein the blades (14) each have a cambered upper surface formed thereon.
US10/053,643 2002-01-24 2002-01-24 Cooling fan Abandoned US20030138324A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/053,643 US20030138324A1 (en) 2002-01-24 2002-01-24 Cooling fan

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10/053,643 US20030138324A1 (en) 2002-01-24 2002-01-24 Cooling fan

Publications (1)

Publication Number Publication Date
US20030138324A1 true US20030138324A1 (en) 2003-07-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US10/053,643 Abandoned US20030138324A1 (en) 2002-01-24 2002-01-24 Cooling fan

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070172350A1 (en) * 2006-01-23 2007-07-26 Delta Electronics, Inc. Fan and impeller thereof
US20080152490A1 (en) * 2006-12-20 2008-06-26 Tzyy-Pyng Lin Fan device
WO2013060358A1 (en) * 2011-10-25 2013-05-02 Ebm-Papst Mulfingen Gmbh & Co. Kg Axial ventilator wheel

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070172350A1 (en) * 2006-01-23 2007-07-26 Delta Electronics, Inc. Fan and impeller thereof
US7959413B2 (en) * 2006-01-23 2011-06-14 Delta Electronics, Inc. Fan and impeller thereof
US20080152490A1 (en) * 2006-12-20 2008-06-26 Tzyy-Pyng Lin Fan device
WO2013060358A1 (en) * 2011-10-25 2013-05-02 Ebm-Papst Mulfingen Gmbh & Co. Kg Axial ventilator wheel

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