US20050263268A1 - Heat dissipation module with noise reduction - Google Patents

Heat dissipation module with noise reduction Download PDF

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Publication number
US20050263268A1
US20050263268A1 US11/034,859 US3485905A US2005263268A1 US 20050263268 A1 US20050263268 A1 US 20050263268A1 US 3485905 A US3485905 A US 3485905A US 2005263268 A1 US2005263268 A1 US 2005263268A1
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United States
Prior art keywords
outlet
hair structure
heat dissipation
noise
dissipation module
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
US11/034,859
Inventor
Ping-Sheng Kao
Yu-Nien Huang
Tsan-Nan Chien
Yu Liu
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.)
Quanta Computer Inc
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Quanta Computer Inc
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Filing date
Publication date
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Assigned to QUANTA COMPUTER INC. reassignment QUANTA COMPUTER INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHIEN, TSAN-NAN, HUANG, YU-NIEN, KAO, PING-SHENG, LIU, YU
Publication of US20050263268A1 publication Critical patent/US20050263268A1/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
    • H05K7/20136—Forced ventilation, e.g. by fans
    • H05K7/20172—Fan mounting or fan specifications
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
    • H01L23/46—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids
    • H01L23/467—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing gases, e.g. air
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/30—Technical effects
    • H01L2924/301—Electrical effects
    • H01L2924/3011—Impedance

Definitions

  • Taiwan Application Serial Number 93115561 filed May 31, 2004, the disclosure of which is hereby incorporated by reference herein in its entirety.
  • the present invention relates to a heat dissipation module. More particularly, the present invention relates to a heat dissipation module with a noise reduction function.
  • FIG. 1 illustrates a perspective view of a conventional centrifugal fan.
  • a centrifugal fan 100 includes a spiral-shaped flow channel design.
  • a centrifugal impeller 103 transforms air dynamic energy into static pressure so as to overcome high flow impedance inside the case housing of the notebook PC.
  • air driven by the centrifugal impeller 103 flows through the spiral-shaped flow channel and generates a wake flow and a vortex, which create high-frequency and narrow-band noise.
  • Airflow 106 accompanied by the noise goes out of an outlet 104 and enters a dissipation fin set, thereby creating even more high-frequency noise due to friction between airflow and an inner wall of the dissipation fin set.
  • a dissipation device includes a dissipation fin set and a centrifugal fan.
  • the centrifugal fan outputs airflow toward the dissipation fin set to remove the heat from it.
  • the centrifugal fan includes a centrifugal impeller mounted on a motor.
  • An outer housing houses the motor and the centrifugal impeller.
  • An inner wall of the housing's outlet has a hair structure to reduce noise.
  • the dissipation fin set includes a fin structure closely attached to a heat source, as well as an airflow channel housing.
  • the airflow channel also includes a hair structure for reducing noise.
  • the dissipation module with noise reduction not only decreases noise amplitudes, but also stabilizes the wake flow. Namely, the airflow with widespread Haystack noise will make a listener feel more comfortable.
  • FIG. 1 illustrates a perspective view of a conventional centrifugal fan
  • FIG. 2 illustrates a perspective view of a centrifugal fan with a noise reduction function according to one preferred embodiment of this invention
  • FIG. 3 illustrates a perspective view of a dissipation module with a noise reduction function according to another preferred embodiment of this invention.
  • FIG. 3A illustrates a cross sectional view of a dissipation module with a noise reduction function according to another preferred embodiment of this invention.
  • the present invention discloses a heat dissipation module with a noise reduction function.
  • a hair structure By attaching a hair structure to an inner sidewall of a centrifugal fan's outlet, noise can be reduced.
  • the hair structure can also be attached on an inner sidewall of a flow channel, such as a dissipation fin set, to reduce noise.
  • FIG. 2 illustrates a perspective view of a centrifugal fan with a noise reduction function according to one preferred embodiment of this invention.
  • a centrifugal fan 200 includes a centrifugal impeller 203 .
  • a motor (not illustrated in FIG. 2 ) in the centrifugal fan 200 rotates the centrifugal impeller 203 to input air from an inlet 202 , guide it through a spiral-shaped flow channel 201 and output it via an outlet 204 . Because there is friction between airflow 206 and inner sidewall 205 of the spiral-shaped flow channel 201 , many specific high frequency and narrow-band noises are created.
  • this preferred embodiment attaches a hair structure 222 a on inner sidewall 207 of the outlet 204 .
  • the outlet 204 including the hair structure 222 a serves as a noise reduction function, which not only makes the airflow near the sidewall 207 smooth, but also breaks noise caused by airflow 206 hitting the sidewall 207 .
  • the hair structure 222 a can absorb or interfere with the noise.
  • the hair structure 222 a should be small enough so as not to increase flow impedance.
  • the hair structure 222 a can be attached to the inner sidewall 207 of the outlet 204 by glue.
  • FIG. 3 illustrates a perspective view of a dissipation module with a noise reduction function according to another preferred embodiment of this invention.
  • FIG. 3A illustrates a cross sectional view taken along the cross-sectional line A-A in FIG. 3 .
  • the hair structure 222 a mentioned in FIG. 2 can also be designed in a flow channel 211 of a dissipation fin set 210 .
  • This preferred embodiment includes a centrifugal fan 200 and a dissipation fin set 210 .
  • the dissipation fin set 210 is closely attached to a heat source 220 to distribute the heat rapidly.
  • the dissipation fin set 210 consists of many fins 212 and airflow channel housing 216 .
  • the airflow channel housing 216 includes securing flanges 217 at two sides, and flanges 217 have screw holes for mounting.
  • the dissipation fin set 210 includes an inlet 208 receiving an airflow 206 output by the centrifugal fan 200 .
  • the airflow 206 goes through fins 212 and carries the heat out of an outlet 218 .
  • the hair structure 222 a / 222 b is designed both on inner sidewall 207 of the outlet 204 and in the flow channel 211 of the dissipation fin set 210 .
  • the outlet including the hair structure has a noise reduction function, which not only makes the airflow near the sidewall smooth, but also breaks noise caused by airflow hitting the sidewall. Moreover, the hair structure can absorb or interfere with the noise.
  • the hair structure made of Nylon or other artificial fiber, should be small enough so as not to increase flow impedance.
  • the hair structure can be attached to the inner sidewall of the outlet by glue. The hair structure is effective in reducing high-frequency noise, and its cross-sectional area is an important factor. For common design, an inner, cross-sectional diameter D/d is 0.5 to 1.0 times the noise wavelength.
  • the hair structure doesn't have its hairs arranged uniformly or with the same gaps between hairs.
  • a performance of noise reduction varies as a function of length, density or flexibility of said hair structure.
  • the dissipation module with noise reduction not only decreases noise amplitudes, but also stabilizes the wake flow. Namely, the airflow with widespread Haystack noise will make a listener feel more comfortable.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Abstract

A dissipation device has a dissipation fin set and a centrifugal fan. The centrifugal fan outputs airflow toward the dissipation fin set to remove the heat from it. The centrifugal fan includes a centrifugal impeller mounted on a motor. An outer housing houses the motor and the centrifugal impeller. An inner wall of the housing's outlet has hair structure to reduce noise. The dissipation fin set includes a fin structure closely attached to a heat source, as well as an airflow channel housing. The airflow channel also includes a hair structure for reducing noise.

Description

    RELATED APPLICATIONS
  • The present application is based on, and claims priority from, Taiwan Application Serial Number 93115561, filed May 31, 2004, the disclosure of which is hereby incorporated by reference herein in its entirety.
    • BACKGROUND
  • 1. Field of Invention
  • The present invention relates to a heat dissipation module. More particularly, the present invention relates to a heat dissipation module with a noise reduction function.
  • 2. Description of Related Art
  • As a notebook PC becomes thinner, there isn't enough space for heat convection and heat dissipation design inside the case housing of the notebook PC. When it comes to high-frequency components, such as the CPU (central processing unit) and graphics processing chip, the heat dissipation design hits a bottleneck. Thus, the mainstream framework of heat dissipation design is forced heat convection caused by a centrifugal fan.
  • FIG. 1 illustrates a perspective view of a conventional centrifugal fan. A centrifugal fan 100 includes a spiral-shaped flow channel design. A centrifugal impeller 103 transforms air dynamic energy into static pressure so as to overcome high flow impedance inside the case housing of the notebook PC. On the other hand, air driven by the centrifugal impeller 103 flows through the spiral-shaped flow channel and generates a wake flow and a vortex, which create high-frequency and narrow-band noise. Airflow 106 accompanied by the noise goes out of an outlet 104 and enters a dissipation fin set, thereby creating even more high-frequency noise due to friction between airflow and an inner wall of the dissipation fin set.
  • Once heat dissipation efficiency is enhanced, airflow is essentially accelerated. The stronger the airflow is, the more turbulent the wake flow is. Thus, a notebook PC manufacturer faces a challenge between noise and heat dissipation efficiency.
    • SUMMARY
  • It is therefore an objective of the present invention to provide a heat dissipation module with a noise reduction function so as to reduce noise caused by strong airflow.
  • In accordance with the foregoing and other objectives of the present invention, a dissipation device includes a dissipation fin set and a centrifugal fan. The centrifugal fan outputs airflow toward the dissipation fin set to remove the heat from it. The centrifugal fan includes a centrifugal impeller mounted on a motor. An outer housing houses the motor and the centrifugal impeller. An inner wall of the housing's outlet has a hair structure to reduce noise. The dissipation fin set includes a fin structure closely attached to a heat source, as well as an airflow channel housing. The airflow channel also includes a hair structure for reducing noise.
  • Thus, the dissipation module with noise reduction not only decreases noise amplitudes, but also stabilizes the wake flow. Namely, the airflow with widespread Haystack noise will make a listener feel more comfortable.
  • It is to be understood that both the foregoing general description and the following detailed description are examples, and are intended to provide further explanation of the invention as claimed.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In the drawings,
  • FIG. 1 illustrates a perspective view of a conventional centrifugal fan;
  • FIG. 2 illustrates a perspective view of a centrifugal fan with a noise reduction function according to one preferred embodiment of this invention;
  • FIG. 3 illustrates a perspective view of a dissipation module with a noise reduction function according to another preferred embodiment of this invention; and
  • FIG. 3A illustrates a cross sectional view of a dissipation module with a noise reduction function according to another preferred embodiment of this invention.
    • DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • Reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
  • In order to reduce noise caused by strong airflow, the present invention discloses a heat dissipation module with a noise reduction function. By attaching a hair structure to an inner sidewall of a centrifugal fan's outlet, noise can be reduced. The hair structure can also be attached on an inner sidewall of a flow channel, such as a dissipation fin set, to reduce noise.
  • FIG. 2 illustrates a perspective view of a centrifugal fan with a noise reduction function according to one preferred embodiment of this invention. A centrifugal fan 200 includes a centrifugal impeller 203. A motor (not illustrated in FIG. 2) in the centrifugal fan 200 rotates the centrifugal impeller 203 to input air from an inlet 202, guide it through a spiral-shaped flow channel 201 and output it via an outlet 204. Because there is friction between airflow 206 and inner sidewall 205 of the spiral-shaped flow channel 201, many specific high frequency and narrow-band noises are created. In order to reduce high-frequency and narrow-band noise, this preferred embodiment attaches a hair structure 222 a on inner sidewall 207 of the outlet 204. The outlet 204 including the hair structure 222 a serves as a noise reduction function, which not only makes the airflow near the sidewall 207 smooth, but also breaks noise caused by airflow 206 hitting the sidewall 207. Moreover, the hair structure 222 a can absorb or interfere with the noise. The hair structure 222 a should be small enough so as not to increase flow impedance. The hair structure 222 a can be attached to the inner sidewall 207 of the outlet 204 by glue.
  • FIG. 3 illustrates a perspective view of a dissipation module with a noise reduction function according to another preferred embodiment of this invention. FIG. 3A illustrates a cross sectional view taken along the cross-sectional line A-A in FIG. 3. The hair structure 222 a mentioned in FIG. 2 can also be designed in a flow channel 211 of a dissipation fin set 210. This preferred embodiment includes a centrifugal fan 200 and a dissipation fin set 210. Referring to FIG. 3A, the dissipation fin set 210 is closely attached to a heat source 220 to distribute the heat rapidly. The dissipation fin set 210 consists of many fins 212 and airflow channel housing 216. The airflow channel housing 216 includes securing flanges 217 at two sides, and flanges 217 have screw holes for mounting. The dissipation fin set 210 includes an inlet 208 receiving an airflow 206 output by the centrifugal fan 200. The airflow 206 goes through fins 212 and carries the heat out of an outlet 218.
  • In this preferred embodiment, the hair structure 222 a/222 b is designed both on inner sidewall 207 of the outlet 204 and in the flow channel 211 of the dissipation fin set 210. The outlet including the hair structure has a noise reduction function, which not only makes the airflow near the sidewall smooth, but also breaks noise caused by airflow hitting the sidewall. Moreover, the hair structure can absorb or interfere with the noise. The hair structure, made of Nylon or other artificial fiber, should be small enough so as not to increase flow impedance. The hair structure can be attached to the inner sidewall of the outlet by glue. The hair structure is effective in reducing high-frequency noise, and its cross-sectional area is an important factor. For common design, an inner, cross-sectional diameter D/d is 0.5 to 1.0 times the noise wavelength.
  • Further, the hair structure doesn't have its hairs arranged uniformly or with the same gaps between hairs. A performance of noise reduction varies as a function of length, density or flexibility of said hair structure.
  • According to preferred embodiments, the dissipation module with noise reduction not only decreases noise amplitudes, but also stabilizes the wake flow. Namely, the airflow with widespread Haystack noise will make a listener feel more comfortable.
  • It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.

Claims (13)

1. A centrifugal fan with a noise reduction function, comprising:
a centrifugal impeller; and
an outer housing, said centrifugal impeller being housed inside, said outer housing comprising:
an inlet, positioned along an axial direction of said centrifugal impeller;
an outlet, positioned along a radial direction of said centrifugal impeller; and
a hair structure, positioned on an inner sidewall of said outlet to reduce noise.
2. The centrifugal fan of claim 1, wherein an inner, cross-sectional diameter of said outlet is about 0.5 to 1.0 times a noise wavelength.
3. The centrifugal fan of claim 1, wherein said hair structure is made of Nylon or artificial fiber.
4. The centrifugal fan of claim 1, wherein said hair structure is attached to said inner sidewall of said outlet by glue.
5. The centrifugal fan of claim 1, wherein a performance of noise reduction varies as a function of length, density or flexibility of said hair structure.
6. A heat dissipation module with a noise reduction function, comprising:
a dissipation fin set, closely attached to a heat source;
a airflow channel housing, securing said dissipation fin set and the heat source inside, wherein said airflow channel housing includes a first inlet, a first outlet and a first hair structure, positioned on a inner sidewall of said airflow channel housing to reduce noise; and
an outer housing, a centrifugal impeller being housed inside, said outer housing comprising:
a second inlet, positioned along an axial direction of said centrifugal impeller;
a second outlet, positioned along a radial direction of said centrifugal impeller, wherein air driven by said centrifugal impeller is guided out of said second outlet and guided into said first inlet; and
a second hair structure, positioned on a inner sidewall of said second outlet to reduce noise.
7. The heat dissipation module of claim 6, wherein an inner, cross-sectional diameter of said second outlet is about 0.5 to 1.0 times a noise wavelength.
8. The heat dissipation module of claim 6, wherein an inner, cross-sectional diameter of said airflow channel housing is about 0.5 to 1.0 times a noise wavelength.
9. The heat dissipation module of claim 6, wherein said first and second hair structures are made of Nylon or artificial fiber.
10. The heat dissipation module of claim 6, wherein said first hair structure is attached to said inner sidewall of said airflow channel housing by glue.
11. The heat dissipation module of claim 6, wherein said second hair structure is attached to said inner sidewall of said second outlet by glue.
12. The heat dissipation module of claim 6, wherein a performance of noise reduction varies as a function of length, density or flexibility of said first hair structure.
13. The heat dissipation module of claim 6, wherein a performance of noise reduction varies as a function of length, density or flexibility of said second hair structure.
US11/034,859 2004-05-31 2005-01-14 Heat dissipation module with noise reduction Abandoned US20050263268A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW093115561A TWI264267B (en) 2004-05-31 2004-05-31 Dissipation module with noise reduction function
TW93115561 2004-05-31

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100159816A1 (en) * 2008-12-23 2010-06-24 International Business Machines Corporation Converging segments cooling
WO2014175975A1 (en) * 2013-04-26 2014-10-30 CoolChip Technologies, Inc. Kinetic heat sink with stationary fins
US20200159296A1 (en) * 2018-11-21 2020-05-21 Inventec (Pudong) Technology Corporation Electronic device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5418339A (en) * 1993-11-04 1995-05-23 Minnesota Mining And Manufacturing Company Pneumatic tool having noise reducing muffling structure
US5953787A (en) * 1996-09-10 1999-09-21 Kwangiu Electronics Co., Ltd. Suction globe of a vacuum cleaner
US6113485A (en) * 1997-11-26 2000-09-05 Advanced Micro Devices, Inc. Duct processor cooling for personal computer
US6422655B1 (en) * 1999-11-12 2002-07-23 Continental General Tire, Inc. Tire inside noise absorber
US6657860B2 (en) * 2001-07-13 2003-12-02 International Business Machines Corporation Heat dissipating device and computer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5418339A (en) * 1993-11-04 1995-05-23 Minnesota Mining And Manufacturing Company Pneumatic tool having noise reducing muffling structure
US5953787A (en) * 1996-09-10 1999-09-21 Kwangiu Electronics Co., Ltd. Suction globe of a vacuum cleaner
US6113485A (en) * 1997-11-26 2000-09-05 Advanced Micro Devices, Inc. Duct processor cooling for personal computer
US6422655B1 (en) * 1999-11-12 2002-07-23 Continental General Tire, Inc. Tire inside noise absorber
US6657860B2 (en) * 2001-07-13 2003-12-02 International Business Machines Corporation Heat dissipating device and computer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100159816A1 (en) * 2008-12-23 2010-06-24 International Business Machines Corporation Converging segments cooling
WO2014175975A1 (en) * 2013-04-26 2014-10-30 CoolChip Technologies, Inc. Kinetic heat sink with stationary fins
US20200159296A1 (en) * 2018-11-21 2020-05-21 Inventec (Pudong) Technology Corporation Electronic device

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Publication number Publication date
TWI264267B (en) 2006-10-11
TW200539791A (en) 2005-12-01

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Owner name: QUANTA COMPUTER INC., TAIWAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KAO, PING-SHENG;HUANG, YU-NIEN;CHIEN, TSAN-NAN;AND OTHERS;REEL/FRAME:016180/0666;SIGNING DATES FROM 20041229 TO 20041230

STCB Information on status: application discontinuation

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