US20020006328A1 - Fan guide - Google Patents
Fan guide Download PDFInfo
- Publication number
- US20020006328A1 US20020006328A1 US09/750,546 US75054600A US2002006328A1 US 20020006328 A1 US20020006328 A1 US 20020006328A1 US 75054600 A US75054600 A US 75054600A US 2002006328 A1 US2002006328 A1 US 2002006328A1
- Authority
- US
- United States
- Prior art keywords
- fan
- frames
- central frame
- guide
- fan guide
- 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
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Images
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
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
-
- 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
-
- 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially adapted for elastic fluid pumps
- F04D29/542—Bladed diffusers
- F04D29/544—Blade shapes
Definitions
- the present invention relates to a fan guide, and, more particularly, to a fan guide for fixing and supporting a fan and a driving motor adapted to drive the fan at an intake part of the fan.
- a fan guide is used to support a fan and a driving motor, which are used in a cooling device or a ventilator of electronic products to produce an air flow.
- a conventional microwave oven has a casing 1 defined with a cooking chamber 2 therein.
- a magnetron 3 producing a microwave is attached to an outer wall portion of the cooking chamber 2 .
- a waveguide 4 guiding the microwave is coupled between the magnetron 3 and the cooking chamber 2 .
- a cooling fan assembly 10 is attached to an inner wall portion of the casing 1 to cool the magnetron 3 along with a power supply unit 5 .
- the cooling fan assembly 10 comprises a fan guide 11 fixed to the inner wall portion of the casing 1 , a driving motor 12 arranged in front of the fan guide 11 , that is, upstream of the fan guide 11 , when viewed in a flow direction of air, and attached to the fan guide 11 , and a fan 13 connected to a driving shaft of the driving motor 12 and adapted to suck and discharge air.
- the fan guide 11 comprises a guide body 11 a and eight frames 11 b.
- the frames 11 b are arranged in pair around the center of the guide body 11 a in the form of a lattice in such a fashion that those of each frame pair are connected together while defining a right angle there between.
- the drive motor 12 is fixedly mounted to the fan guide 11 at a joint between the frames 11 b of each frame pair.
- the reference numeral 11 c denotes a motor fixture arranged at the joint between the frames 11 b of each frame pair.
- a microwave is generated from the magnetron 3 , and supplied to the cooking chamber 2 through the wave guide 4 .
- the electric power is also supplied to the driving motor 12 simultaneously with the application thereof to the power supply unit 5 , so that the driving motor 12 rotates.
- the fan 13 connected to the driving shaft of the driving motor 12 is rotated, thereby sucking outside air. Accordingly, the magnetron 3 and the power supply unit 5 are cooled by the sucked air.
- the air which is sucked by the fan 13 , flows toward the fan 12 after passing through spaces defined among the frames 11 b arranged at the front surface of the fan guide 11 .
- flow noise and flow loss may be generated due to the geometrical characteristics of the frames 11 b coupled to the fan guide 11 .
- the blade passing frequency generated by the fan is reinforced when the geometrical structure of those frames is more regular and uniform.
- the reinforced blade passing frequency results in a generation of flow noise.
- the air passing the frames generates a vortex shedding phenomenon, so that it interferes with the blades of the fan. Due to such an interference, there are problems of an increase in noise and an occurrence of flow loss.
- an object of the present invention is to provide a fan guide having an asymmetric arrangement of frames capable of decreasing the degree of noise resulting from a blade passing frequency while destroying the regularity of a vortex shedding formed at each frame to reduce the interaction between a vortex flow and fan blades, thereby achieving a reduction in noise and flow loss.
- a fan guide comprising: a rectangular guide body located at a suction part of a fan; a central frame positioned at a central portion of the guide body; motor fixtures provided at an outer circumferential surface of the central frame; and at least two frames for connecting the guide body and the central frame to each other while supporting the fan and a driving motor adapted to drive the fan, the frames being arranged around the central frame while being circumferentially spaced apart from one another by different angles, respectively.
- FIG. 1 is a partially-broken schematic view of a conventional microwave oven.
- FIG. 2 is an exploded perspective view of a fan guide according to the conventional microwave oven.
- FIG. 3 is a front view of the conventional fan guide.
- FIG. 4 is an exploded perspective view of a fan guide according to the present invention.
- FIG. 5 is a front view of a fan guide of the present invention.
- FIG. 6 is a front view of an another fan guide modified from the fan guide of FIG. 5.
- FIG. 7 is a graph representing a comparative analysis of rear noise characteristics exhibited in a microwave oven, to which the fan guide of the present invention is applied, as compared to the case in which a conventional fan guide is applied.
- a cooling fan assembly 100 of a microwave oven having a fan guide of the present invention includes a fan guide 110 attached to an inner wall portion of a casing 1 , a driving motor 120 arranged in front of the fan guide 110 , and a fan 130 connected to a motor shaft of the driving motor 120 and located in rear of the fan guide 110 , that is, downstream of the fan guide 110 , and adapted to suck air from the front end of the fan guide 110 and to discharge the sucked air toward a magnetron 3 located in rear of the fan 130 .
- the fan guide 110 includes a guide body 111 receiving the fan 130 , three straight frames 112 a, 112 b, and 112 c, and a central frame 113 .
- Each of the straight frames 112 a, 112 b, and 112 c is integral, at the outer end thereof, with the front surface of the guide body 111 while being integral, at the inner end thereof, with the central frame 113 .
- the straight frames 112 a, 112 b, and 112 c are arranged around the central frame 113 to extend in a direction similar to a radial direction while being circumferentially spaced apart from one another by different angles ⁇ 1 , ⁇ 2 , and ⁇ 3 , respectively.
- the arrangement of the straight frames 112 a, 112 b, and 112 c are set so that intersections P 1 , P 2 , and P 3 among lines extending inwardly along the straight frames 112 a, 112 b, and 112 c beyond the central frame 113 , respectively, discord from one another.
- FIG. 6 An another embodiment of the straight frames 112 a , 112 b , and 112 c is shown in FIG. 6.
- curved frames 212 a, 212 b, and 212 c are provided.
- the reference numeral 114 in FIG. 4 denotes a motor fixture.
- the above mentioned blade passing frequency and vortex shedding may be generated when air is sucked.
- the straight frames 112 a, 112 b, and 112 c or curved frames 212 a, 212 b, and 212 c are asymmetrically arranged, the degree of noise generated by the blade passing frequency is reduced as air passes through those frames.
- the regularity of the vortex shedding formed at each frame is also destroyed, thereby reducing the interaction between a vortex flow generated at each frame and the fan. Accordingly, a reduction in flow noise and flow loss is achieved.
- the fan guide of the present invention is applied to a microwave oven, it is possible to considerably reduce the flow noise generated during the operation of the fan while considerably reducing the level of noise outwardly emitted from the oven, as compared to the cases using conventional fan guides. This is apparent from FIG. 7. As shown in FIG. 7, the fan guide of the present invention provides an effect of reducing the ventilation noise generated during the operation of the fan by an average of about 2.3 dB(A) when detected outside the casing.
Abstract
Disclosed is a fan guide including a rectangular guide body located at a suction part of a fan, a central frame positioned at a central portion of the guide body, motor fixtures provided at an outer circumferential surface of the central frame, and frames for connecting the guide body and the central frame to each other while supporting the fan and a driving motor adapted to drive the fan. The frames are arranged around the central frame while being circumferentially spaced apart from one another by different angles, respectively. The arrangement of the frames is set so that intersections among lines extending inwardly along the frames beyond the central frame, respectively, discord from one another. By this arrangement, it is possible to decrease the degree of noise resulting from a blade passing frequency while destroying the regularity of a vortex shedding formed at each frame to reduce the interaction between a vortex flow and fan blades, thereby achieving a reduction in noise and flow loss.
Description
- 1. Field of the Invention
- The present invention relates to a fan guide, and, more particularly, to a fan guide for fixing and supporting a fan and a driving motor adapted to drive the fan at an intake part of the fan.
- 2. Description of the Conventional Art
- In general, a fan guide is used to support a fan and a driving motor, which are used in a cooling device or a ventilator of electronic products to produce an air flow.
- In such a cooling device or ventilator, an air flow passing through the driving motor by a rotation of the fan generates a noise mainly by the fan. In an interrelation between the fan and the fan guide, it is known that the degree of the noise may vary greatly depending on the shape of the fan guide. No matter what any kind of the fan is used, the cooling device or the ventilator having the above mentioned fan guide structure produces a blade passing frequency, thus generating noise.
- As shown in FIG. 1, a conventional microwave oven has a
casing 1 defined with acooking chamber 2 therein. Amagnetron 3 producing a microwave is attached to an outer wall portion of thecooking chamber 2. Awaveguide 4 guiding the microwave is coupled between themagnetron 3 and thecooking chamber 2. Acooling fan assembly 10 is attached to an inner wall portion of thecasing 1 to cool themagnetron 3 along with apower supply unit 5. - As shown in FIG. 2, the
cooling fan assembly 10 comprises afan guide 11 fixed to the inner wall portion of thecasing 1, a drivingmotor 12 arranged in front of thefan guide 11, that is, upstream of thefan guide 11, when viewed in a flow direction of air, and attached to thefan guide 11, and afan 13 connected to a driving shaft of thedriving motor 12 and adapted to suck and discharge air. - Referring to FIG. 3, the
fan guide 11 is more specifically described. Thefan guide 11 comprises aguide body 11 a and eightframes 11 b. Theframes 11 b are arranged in pair around the center of theguide body 11 a in the form of a lattice in such a fashion that those of each frame pair are connected together while defining a right angle there between. Thedrive motor 12 is fixedly mounted to thefan guide 11 at a joint between theframes 11 b of each frame pair. - In FIG. 2, the
reference numeral 11 c denotes a motor fixture arranged at the joint between theframes 11 b of each frame pair. - In the microwave oven having the above mentioned
conventional fan guide 11, the operating procedure of the microwave oven and the procedure of sucking air are carried out as follows. - Once electric power is supplied to the
power supply unit 5, a microwave is generated from themagnetron 3, and supplied to thecooking chamber 2 through thewave guide 4. By the supplied microwave, food in thecooking chamber 2 is heated and cooked. The electric power is also supplied to thedriving motor 12 simultaneously with the application thereof to thepower supply unit 5, so that thedriving motor 12 rotates. As a result, thefan 13 connected to the driving shaft of the drivingmotor 12 is rotated, thereby sucking outside air. Accordingly, themagnetron 3 and thepower supply unit 5 are cooled by the sucked air. - At this time, the air, which is sucked by the
fan 13, flows toward thefan 12 after passing through spaces defined among theframes 11 b arranged at the front surface of thefan guide 11. During this sucking procedure, flow noise and flow loss may be generated due to the geometrical characteristics of theframes 11 b coupled to thefan guide 11. - This problem will now be described in detail.
- In the conventional fan guide in which frames are arranged in pair around the center of the guide body in the form of a lattice in such a fashion that those of each frame pair are connected together while defining an angle α there between, the blade passing frequency generated by the fan is reinforced when the geometrical structure of those frames is more regular and uniform. The reinforced blade passing frequency results in a generation of flow noise. The air passing the frames generates a vortex shedding phenomenon, so that it interferes with the blades of the fan. Due to such an interference, there are problems of an increase in noise and an occurrence of flow loss.
- Accordingly, an object of the present invention is to provide a fan guide having an asymmetric arrangement of frames capable of decreasing the degree of noise resulting from a blade passing frequency while destroying the regularity of a vortex shedding formed at each frame to reduce the interaction between a vortex flow and fan blades, thereby achieving a reduction in noise and flow loss.
- In accordance with the present invention, this object is accomplished by providing a fan guide comprising: a rectangular guide body located at a suction part of a fan; a central frame positioned at a central portion of the guide body; motor fixtures provided at an outer circumferential surface of the central frame; and at least two frames for connecting the guide body and the central frame to each other while supporting the fan and a driving motor adapted to drive the fan, the frames being arranged around the central frame while being circumferentially spaced apart from one another by different angles, respectively.
- FIG. 1 is a partially-broken schematic view of a conventional microwave oven.
- FIG. 2 is an exploded perspective view of a fan guide according to the conventional microwave oven.
- FIG. 3 is a front view of the conventional fan guide.
- FIG. 4 is an exploded perspective view of a fan guide according to the present invention.
- FIG. 5 is a front view of a fan guide of the present invention.
- FIG. 6 is a front view of an another fan guide modified from the fan guide of FIG. 5.
- FIG. 7 is a graph representing a comparative analysis of rear noise characteristics exhibited in a microwave oven, to which the fan guide of the present invention is applied, as compared to the case in which a conventional fan guide is applied.
- The above and other objects, characteristics, and advantages of the present invention will become apparent from the following description along with the accompanying drawings, in which the same elements as those in the related art will be designated by the same reference numerals.
- As shown in FIG. 4, a
cooling fan assembly 100 of a microwave oven having a fan guide of the present invention includes afan guide 110 attached to an inner wall portion of acasing 1, adriving motor 120 arranged in front of thefan guide 110, and afan 130 connected to a motor shaft of thedriving motor 120 and located in rear of thefan guide 110, that is, downstream of thefan guide 110, and adapted to suck air from the front end of thefan guide 110 and to discharge the sucked air toward amagnetron 3 located in rear of thefan 130. - As shown in FIG. 5, the
fan guide 110 includes aguide body 111 receiving thefan 130, threestraight frames central frame 113. Each of thestraight frames guide body 111 while being integral, at the inner end thereof, with thecentral frame 113. - The
straight frames central frame 113 to extend in a direction similar to a radial direction while being circumferentially spaced apart from one another by different angles β1, β2, and β3, respectively. - Further, the arrangement of the
straight frames straight frames central frame 113, respectively, discord from one another. - An another embodiment of the
straight frames curved frames - The
reference numeral 114 in FIG. 4 denotes a motor fixture. - Even in the microwave oven equipped with the fan guide of the present invention, the above mentioned blade passing frequency and vortex shedding may be generated when air is sucked. However, since the
straight frames curved frames - Where the fan guide of the present invention is applied to a microwave oven, it is possible to considerably reduce the flow noise generated during the operation of the fan while considerably reducing the level of noise outwardly emitted from the oven, as compared to the cases using conventional fan guides. This is apparent from FIG. 7. As shown in FIG. 7, the fan guide of the present invention provides an effect of reducing the ventilation noise generated during the operation of the fan by an average of about 2.3 dB(A) when detected outside the casing.
- While there have been illustrated and described what are considered to be preferred specific embodiments of the present invention, it will be understood by those skilled in the art that the present invention is not limited to the specific embodiments thereof, and various changes and modifications and equivalents may be substituted for elements thereof without departing from the true scope of the present invention.
Claims (5)
1. A fan guide comprising:
a rectangular guide body located at a suction part of a fan;
a central frame positioned at a central portion of the guide body;
motor fixtures provided at an outer circumferential surface of the central frame; and
at least two frames for connecting the guide body and the central frame to each other while supporting the fan and a driving motor adapted to drive the fan, the frames being arranged around the central frame while being circumferentially spaced apart from one another by different angles, respectively.
2. A fan guide as claimed in claim 1 , wherein the frames are arranged so that intersections among lines extending inwardly along the frames beyond the central frame, respectively, discord from one another.
3. A fan guide as claimed in claim 1 , wherein the central frame has a circular structure.
4. A fan guide as claimed in claim 1 , wherein each of the frames has a straight structure.
5. A fan guide as claimed in claim 1 , wherein each of th e frames has a curved structure.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/408,929 US6883233B2 (en) | 2000-07-11 | 2003-04-07 | Fan guide |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR39587/2000 | 2000-07-11 | ||
KR10-2000-0039587A KR100382913B1 (en) | 2000-07-11 | 2000-07-11 | Fan guide |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/408,929 Continuation-In-Part US6883233B2 (en) | 2000-07-11 | 2003-04-07 | Fan guide |
Publications (1)
Publication Number | Publication Date |
---|---|
US20020006328A1 true US20020006328A1 (en) | 2002-01-17 |
Family
ID=19677369
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/750,546 Abandoned US20020006328A1 (en) | 2000-07-11 | 2000-12-28 | Fan guide |
Country Status (2)
Country | Link |
---|---|
US (1) | US20020006328A1 (en) |
KR (1) | KR100382913B1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090277205A1 (en) * | 2005-11-01 | 2009-11-12 | Daikin Industries, Ltd. | Outdoor unit of air conditioner |
CN102269183A (en) * | 2011-07-08 | 2011-12-07 | 无锡杰尔压缩机有限公司 | Air outlet structure of filter silencer |
EP1534960B1 (en) * | 2002-09-06 | 2013-02-13 | Honeywell International Inc. | Aperiodic struts for enhanced blade responses |
CN106438412A (en) * | 2016-11-02 | 2017-02-22 | 美的集团股份有限公司 | Draught fan assembly and household electric appliance with same |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100360881C (en) * | 2003-04-11 | 2008-01-09 | 乐金电子(天津)电器有限公司 | Air supply device for cold air circulation of refrigerator |
-
2000
- 2000-07-11 KR KR10-2000-0039587A patent/KR100382913B1/en not_active IP Right Cessation
- 2000-12-28 US US09/750,546 patent/US20020006328A1/en not_active Abandoned
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1534960B1 (en) * | 2002-09-06 | 2013-02-13 | Honeywell International Inc. | Aperiodic struts for enhanced blade responses |
US20090277205A1 (en) * | 2005-11-01 | 2009-11-12 | Daikin Industries, Ltd. | Outdoor unit of air conditioner |
CN102269183A (en) * | 2011-07-08 | 2011-12-07 | 无锡杰尔压缩机有限公司 | Air outlet structure of filter silencer |
CN106438412A (en) * | 2016-11-02 | 2017-02-22 | 美的集团股份有限公司 | Draught fan assembly and household electric appliance with same |
Also Published As
Publication number | Publication date |
---|---|
KR20020006110A (en) | 2002-01-19 |
KR100382913B1 (en) | 2003-05-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: LG ELECTRONICS INC., KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:YOON, HONG YEOL;REEL/FRAME:011417/0373 Effective date: 20001201 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |