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US20070116557A1 - Low noise blower fan - Google Patents

Low noise blower fan Download PDF

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Publication number
US20070116557A1
US20070116557A1 US11/309,541 US30954106A US2007116557A1 US 20070116557 A1 US20070116557 A1 US 20070116557A1 US 30954106 A US30954106 A US 30954106A US 2007116557 A1 US2007116557 A1 US 2007116557A1
Authority
US
United States
Prior art keywords
blower fan
pad
base plate
bearing
sealing plate
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
US11/309,541
Inventor
Jin-Bo Qiu
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.)
Hon Hai Precision Industry Co Ltd
Original Assignee
Hon Hai Precision Industry Co Ltd
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 Hon Hai Precision Industry Co Ltd filed Critical Hon Hai Precision Industry Co Ltd
Assigned to HON HAI PRECISION INDUSTRY CO., LTD. reassignment HON HAI PRECISION INDUSTRY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: QIU, JIN-BO
Publication of US20070116557A1 publication Critical patent/US20070116557A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • F04D29/663—Sound attenuation
    • F04D29/664—Sound attenuation by means of sound absorbing material

Definitions

  • the present invention relates to a blower fan, and particularly to a blower fan which has low noise.
  • Vibration of blower fans due to rotor imbalance is noisy. If the vibrations are of a high frequency and have a large amplitude, a fairly loud noise can be produced. This noise may become annoying to users of a device with such a blower fan.
  • FIG. 5 a conventional blower fan is shown.
  • a case of the blower fan includes a base plate 20 , and a bearing set 40 extends upwardly from the base plate 20 .
  • a pair of ball bearings 10 is supported by the bearing set 40 .
  • a shaft 50 is supported by the ball bearing 10 .
  • a sealing plate 30 is mounted on the base plate 20 . Vibration of the shaft 50 is transmitted to the base plate 20 via the ball bearings 10 , then to the sealing plate 30 . If the sealing plate 30 and the base plate 20 have large amplitude vibrations, noise is produced.
  • FIG. 6 is a graph showing noise characteristics of the conventional blower fan shown in FIG. 5 . A peak noise level is nearly 40 dB.
  • An exemplary low noise blower fan includes a base plate for supporting a rotating shaft and a bearing. The shaft is rotated in the bearing. A pad made of damping material is attached to the base plate to dampen vibrations.
  • FIG. 1 is an exploded isometric view of a blower fan in accordance with a preferred embodiment of the present invention, the blower fan including a pad;
  • FIG. 2 is an assembled cutaway view of the blower fan of FIG. 1 ;
  • FIG. 3 is a graph showing noise characteristics of the blower fan when the pad of FIG. 1 is made of bitumen
  • FIG. 4 is a graph showing noise characteristics of the blower fan when the pad of FIG. 1 is made of composite materials
  • FIG. 5 is a cutaway view of a conventional blower fan
  • FIG. 6 is a graph showing noise characteristics of the conventional blower fan of FIG. 5 .
  • a case of a blower fan in accordance with a preferred embodiment of the present invention includes a base plate 100 , and a sleeve 300 extending up from the base plate 100 .
  • a pair of ball bearings 400 is supported by the sleeve 300 .
  • a shaft 500 is supported by the ball bearings 400 .
  • the base plate 100 defines a recess in a surface, a sealing plate is received in the recess.
  • the sealing plate 100 encloses one end of the sleeve adjacent the base plate 100 .
  • a pad 600 which is made of damping material is attached to the base plate 100 and covers the sealing plate 200 . The pad 600 is pasted on the base plate 100 using glue.
  • the sealing plate 200 is sandwiched between the base plate 100 and the pad 600 . Vibration of the shaft 500 is transmitted to the base plate 100 via the ball bearings 400 , then to the sealing plate 200 , noise is generated mostly due to the vibration of the base plate 100 and the sealing plate 200 .
  • the pad 600 is capable of absorbing vibrations because of the energy-absorbing capacity of the elements constituting the pad 600 . It is preferred that the pad 600 should cover most of the surface area of the base plate 100 of the case of the blower.
  • FIG. 3 is a graph showing noise characteristics of the blower fan when the pad 600 is made of bitumen. It can be seen that peak noise level is no higher than 20 dB. In FIG. 6 , which depicts noise characteristics of a conventional blower fan, peak noise levels exceed 35 dB.
  • FIG. 4 is a graph showing noise characteristics of the blower fan when the pad is made of composite materials. It can be seen that peak noise level is less than 30 dB. Employing the pad 600 made of damping materials reduces noise of the blower fan.
  • the material of the pad 600 is not limited.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

An exemplary low noise blower fan includes a base plate for supporting a rotating shaft and a bearing. The shaft is rotated in the bearing. A vibration damping pad is attached to the base plate. The pad is made of damping material. Accordingly, vibration caused by the base plate can be damped by the pad, whereby noise of the fan is suppressed.

Description

    1. FIELD OF THE INVENTION
  • The present invention relates to a blower fan, and particularly to a blower fan which has low noise.
    • 2. DESCRIPTION OF RELATED ART
  • Vibration of blower fans due to rotor imbalance is noisy. If the vibrations are of a high frequency and have a large amplitude, a fairly loud noise can be produced. This noise may become annoying to users of a device with such a blower fan.
  • Referring to FIG. 5, a conventional blower fan is shown. A case of the blower fan includes a base plate 20, and a bearing set 40 extends upwardly from the base plate 20. A pair of ball bearings 10 is supported by the bearing set 40. A shaft 50 is supported by the ball bearing 10. A sealing plate 30 is mounted on the base plate 20. Vibration of the shaft 50 is transmitted to the base plate 20 via the ball bearings 10, then to the sealing plate 30. If the sealing plate 30 and the base plate 20 have large amplitude vibrations, noise is produced. FIG. 6 is a graph showing noise characteristics of the conventional blower fan shown in FIG. 5. A peak noise level is nearly 40 dB.
  • What is needed is a blower fan that produces less noise.
    • SUMMARY OF THE INVENTION
  • An exemplary low noise blower fan includes a base plate for supporting a rotating shaft and a bearing. The shaft is rotated in the bearing. A pad made of damping material is attached to the base plate to dampen vibrations.
  • It is simple and economical to employ a damping pad to dampen vibrations thereby suppressing noise of the blower fan.
  • Other advantages and novel features will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is an exploded isometric view of a blower fan in accordance with a preferred embodiment of the present invention, the blower fan including a pad;
  • FIG. 2 is an assembled cutaway view of the blower fan of FIG. 1;
  • FIG. 3 is a graph showing noise characteristics of the blower fan when the pad of FIG. 1 is made of bitumen;
  • FIG. 4 is a graph showing noise characteristics of the blower fan when the pad of FIG. 1 is made of composite materials;
  • FIG. 5 is a cutaway view of a conventional blower fan; and
  • FIG. 6 is a graph showing noise characteristics of the conventional blower fan of FIG. 5.
    • DETAILED DESCRIPTION OF THE INVENTION
  • Referring to FIGS. 1 and 2, a case of a blower fan in accordance with a preferred embodiment of the present invention includes a base plate 100, and a sleeve 300 extending up from the base plate 100. A pair of ball bearings 400 is supported by the sleeve 300. A shaft 500 is supported by the ball bearings 400. The base plate 100 defines a recess in a surface, a sealing plate is received in the recess. The sealing plate 100 encloses one end of the sleeve adjacent the base plate 100. A pad 600 which is made of damping material is attached to the base plate 100 and covers the sealing plate 200. The pad 600 is pasted on the base plate 100 using glue. The sealing plate 200 is sandwiched between the base plate 100 and the pad 600. Vibration of the shaft 500 is transmitted to the base plate 100 via the ball bearings 400, then to the sealing plate 200, noise is generated mostly due to the vibration of the base plate 100 and the sealing plate 200. The pad 600 is capable of absorbing vibrations because of the energy-absorbing capacity of the elements constituting the pad 600. It is preferred that the pad 600 should cover most of the surface area of the base plate 100 of the case of the blower.
  • FIG. 3 is a graph showing noise characteristics of the blower fan when the pad 600 is made of bitumen. It can be seen that peak noise level is no higher than 20 dB. In FIG. 6, which depicts noise characteristics of a conventional blower fan, peak noise levels exceed 35 dB.
  • FIG. 4 is a graph showing noise characteristics of the blower fan when the pad is made of composite materials. It can be seen that peak noise level is less than 30 dB. Employing the pad 600 made of damping materials reduces noise of the blower fan.
  • The material of the pad 600 is not limited.
  • It is to be understood, however, that even though numerous characteristics and advantages of the present embodiments 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.

Claims (10)

1. A blower fan comprising a base plate for supporting a rotating shaft and a bearing, the shaft rotatably received in the bearing, a vibration damping pad attached to the base plate.
2. The blower fan as claimed in claim 1, wherein the pad is made of damping material.
3. The blower fan as claimed in claim 2, wherein the pad is made of bitumen.
4. The blower fan as claimed in claim 2, wherein the pad is made of composite materials.
5. The blower fan as claimed in claim 1, further comprising a sealing plate sandwiched between the base and the pad.
6. A blower fan comprising:
a case comprising a base plate, a sleeve extending upwardly from the base plate;
a bearing fixed within the sleeve;
a shaft rotatably extending through the bearing; and
a pad madding of damping material adhered to the base plate.
7. The blower fan as claimed in claim 6, further comprising a sealing plate sandwiched between the base plate and the pad, the sealing plate enclosing one end o the sleeve adjacent the base plate.
8. The blower fan as claimed in claim 7, wherein the base plate defines a recess in a surface facing the pad, the sealing plate being received in the recess.
9. The blower fan as claimed in claim 6, wherein the pad is made of bitumen.
10. The blower fan as claimed in claim 6, wherein the pad is made of composite materials.
US11/309,541 2005-11-24 2006-08-18 Low noise blower fan Abandoned US20070116557A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNA2005101017547A CN1971066A (en) 2005-11-24 2005-11-24 Low-noise blast fan
CN200510101754.7 2005-11-24

Publications (1)

Publication Number Publication Date
US20070116557A1 true US20070116557A1 (en) 2007-05-24

Family

ID=38053709

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/309,541 Abandoned US20070116557A1 (en) 2005-11-24 2006-08-18 Low noise blower fan

Country Status (2)

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US (1) US20070116557A1 (en)
CN (1) CN1971066A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4611531A (en) * 1984-01-14 1986-09-16 Siegenia-Frank, Kg Ventilation appliance
US4819503A (en) * 1987-12-22 1989-04-11 Unites States Of America As Represented By The Secretay Of The Navy Low frequency structureborne vibration isolation mount
US6246140B1 (en) * 2000-03-09 2001-06-12 Sunonwealth Electric Machine Industry Pivotal structure for a motor rotor
US6508875B1 (en) * 1996-08-16 2003-01-21 Kraton Polymers U.S. Llc Bituminous composition
US7098268B2 (en) * 2001-08-02 2006-08-29 Nippon Steel Chemical Co., Ltd. Resin composition

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4611531A (en) * 1984-01-14 1986-09-16 Siegenia-Frank, Kg Ventilation appliance
US4819503A (en) * 1987-12-22 1989-04-11 Unites States Of America As Represented By The Secretay Of The Navy Low frequency structureborne vibration isolation mount
US6508875B1 (en) * 1996-08-16 2003-01-21 Kraton Polymers U.S. Llc Bituminous composition
US6246140B1 (en) * 2000-03-09 2001-06-12 Sunonwealth Electric Machine Industry Pivotal structure for a motor rotor
US7098268B2 (en) * 2001-08-02 2006-08-29 Nippon Steel Chemical Co., Ltd. Resin composition

Also Published As

Publication number Publication date
CN1971066A (en) 2007-05-30

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Legal Events

Date Code Title Description
AS Assignment

Owner name: HON HAI PRECISION INDUSTRY CO., LTD., TAIWAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:QIU, JIN-BO;REEL/FRAME:018141/0112

Effective date: 20060707

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION

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