US20070122271A1 - Axial-flow fan - Google Patents

Axial-flow fan Download PDF

Info

Publication number
US20070122271A1
US20070122271A1 US11/563,982 US56398206A US2007122271A1 US 20070122271 A1 US20070122271 A1 US 20070122271A1 US 56398206 A US56398206 A US 56398206A US 2007122271 A1 US2007122271 A1 US 2007122271A1
Authority
US
United States
Prior art keywords
stationary blades
end portion
axial
wall portion
side edge
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
US11/563,982
Other languages
English (en)
Inventor
Katsumichi Ishihara
Honami Oosawa
Masashi Miyazawa
Tomoaki Ikeda
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.)
Sanyo Denki Co Ltd
Original Assignee
Sanyo Denki 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 Sanyo Denki Co Ltd filed Critical Sanyo Denki Co Ltd
Assigned to SANYO DENKI CO., LTD. reassignment SANYO DENKI CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IKEDA, TOMOAKI, ISHIHARA, KATSUMICHI, MIYAZAWA, MASASHI, OOSAWA, HONAMI
Publication of US20070122271A1 publication Critical patent/US20070122271A1/en
Priority to US14/136,228 priority Critical patent/US20140105763A1/en
Abandoned legal-status Critical Current

Links

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
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
    • F04D25/0646—Details of the stator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to an axial-flow fan used for cooling an electric component or the like.
  • FIG. 16 is a perspective view of an axial-flow fan equipped with stationary blades shown in FIG. 1 of US Design Patent No. D506540 (Official Gazette)
  • FIG. 17 is a rear view of a conventional axial-flow fan shown in FIG. 5 of the same Official Gazette.
  • each of a plurality of stationary blades 101 is curved, in a convex manner, toward one side in a circumferential direction of a shaft.
  • the plurality of stationary blades 101 are generally inclined so that the suction-side edge portions 101 are located at an opposite side to the suction-side edge portions in the circumferential direction of the shaft.
  • the plurality of stationary blades are inclined at a substantially constant angle.
  • An object of the present invention is to provide an axial-flow fan capable of increasing the amount of airflow and simultaneously reducing the noise level.
  • Another object of the present invention is to provide an axial-flow fan capable of entirely cooling an object to be cooled even when the distance between an object to be cooled and an air discharge opening of the axial-flow fan is short.
  • An axial-flow fan of the present invention comprises a fan housing including an air channel having an air discharge opening and an air suction opening, an impeller having a plurality of blades and disposed inside the fan housing, a rotor to which the impeller is fixed and which rotates about a shaft, a stator disposed corresponding to the rotor, a motor case to which the stator is fixed, and a plurality of stationary blades connecting the motor case and the fan housing.
  • the motor case includes a bottom wall portion located at a side of the air discharge opening and a peripheral wall portion formed continuously with the bottom wall portion and extending toward the air suction opening.
  • the stator is fixed to the bottom wall portion.
  • the plurality of stationary blades are disposed at intervals in a rotating direction of the rotor and located inside the air discharge opening of the air channel.
  • Each of the plurality of stationary blades has an external end portion connected to an inner wall portion of the fan housing, an internal end portion connected to the peripheral wall portion of the motor case, a discharge-side edge portion formed between the external end portion and the internal end portion and located at a side of the air discharge opening, and a suction-side edge portion formed between the external end portion and the internal end portion and located at a side of the air suction opening.
  • Each of a plurality of stationary blades is curved, in a convex manner, toward the rotating direction of the rotor.
  • All or most of stationary blades among the plurality of stationary blades are generally inclined so that the discharge-side edge portions thereof are located more forward than the suction-side edge portions thereof in the rotating direction.
  • all of the plurality of stationary blades have basically the same structure.
  • the plurality of stationary blades except for the one stationary blade i.e., most of stationary blades have basically the same structure.
  • an inclination angle for all or most of the plurality of stationary blades in the vicinity of the external end portion is larger than the inclination angle in the vicinity of the internal end portion, and the inclination angle is gradually changed from the vicinity of the external end portion toward the vicinity of the internal end portion.
  • the inclination angle is defined as an angle formed by a virtual plane along the air discharge opening and a virtual line which passes through a first intersection where an orthogonal virtual plane, which is defined as being orthogonal to the virtual plane and also orthogonal to the discharge-side edge portion and the suction-side edge portion, intersects with the discharge-side portion, and also passes through a second intersection where the orthogonal virtual plane intersects with the suction-side edge portion.
  • the flow rate of air discharged from the air discharge opening of the axial-flow fan tends to become faster in an area closer to the fan housing (in an outer side) while the flow rate tends to become slower in an area closer to the motor case (in an inner side). This tendency is the same when stationary blades of a simple shape are used.
  • the flow rate of the airflow flowing in the vicinity of the internal end portions of the stationary blades is increased with respect to the flow rate of the airflow flowing in the vicinity of the external end portions of the stationary blades.
  • the flow rate of the airflow is gradually increased from the external end portion toward the internal end portion of the stationary blades.
  • the flow rate of the air discharged from the air discharge opening is generally uniformized as much as possible, thereby increasing an amount of the airflow and simultaneously reducing the noise level.
  • the inclination angle is preferably defined as follows; the inclination angle in the vicinity of the external end portion may be within a range of 50° to 60°, and the inclination angle in the vicinity of the internal end portion may be within a range of 45° to 55°.
  • the preferred ranges of the respective inclination angles vary depending on the shape and number of the rotating blades, the shape and number of the stationary blades, the shape of the inner wall portion of the fan housing (the shape of the air channel) and the like.
  • One stationary blade among the plurality of stationary blades may be formed to receive therein the plurality of the lead wires for supplying electric power to the stator.
  • the plurality of stationary blades other than the one stationary blade are the most of the plurality of stationary blades.
  • An outer surface of the bottom wall portion of the motor case may be located closer to the air suction opening than the discharge-side edge portions of all or most of the plurality of the stationary blades are located.
  • the outer surface of the bottom wall portion of the motor case is composed of a flat bottom surface and an outer peripheral surface portion continuous with the flat bottom surface.
  • the flat bottom surface includes not only an entirely flat surface but also a surface of which the major part is flat.
  • a bearing for supporting the shaft may be disposed in the central area of the bottom surface.
  • the outer peripheral surface portion is preferably shaped to be gradually curved from the bottom surface toward the outer peripheral surface of the peripheral wall portion.
  • all or most of the plurality of stationary blades each include an extended portion extending on the bottom wall portion of the motor case, and the extended portion includes a guide surface for guiding a part of air flowing along the stationary blades toward the bottom surface of the bottom wall portion.
  • the air can actively be guided onto the bottom wall portion along the guide surface.
  • the extended portion preferably includes an extended guide surface, which is formed continuously with the guide surface and is extending toward the rotating direction.
  • the extended guide surface helps the airflow, which has run onto the bottom wall portion of the motor case, get spirally out of the air discharge opening smoothly.
  • the amount of airflow produced by the axial-flow fan can be increased more and simultaneously the noise level can be reduced more than ever.
  • FIG. 1 is a perspective view of an axial-flow fan according to an embodiment of the present invention as viewed from the right upper front side thereof, where lead wires are omitted.
  • FIG. 2 is a front view of the axial-flow fan of the embodiment shown in FIG. 1 .
  • FIG. 3 is a rear view of the axial-flow fan of the embodiment shown in FIG. 1 .
  • FIG. 4 is a right-side view of the axial-flow fan shown in FIG. 2 .
  • FIG. 5 is a cross-sectional view of the axial-flow fan as taken along line 5 - 5 in FIG. 4 where an internal structure of a motor is omitted.
  • FIG. 6 is a cross-sectional view of the axial-flow fan as taken along line 6 - 6 in FIG. 4 where the internal structure of the motor is omitted.
  • FIG. 7 is a cross-sectional view as taken along line 7 - 7 in FIG. 2 .
  • FIG. 8 illustrates cross-sectional shapes of a rotating blade and a stationary blade in order to explain the respective shapes of the rotating blade and the stationary blade.
  • FIG. 9A is a perspective view showing airflow paths in this embodiment.
  • FIG. 9B is a perspective view showing airflow paths in a conventional arrangement.
  • FIG. 10A is a fragmentary view of a stationary blade for illustrating an inclination angle
  • FIG. 10B is a cross-sectional view of the stationary blade as taken in the vicinity of an internal end portion
  • FIG. 10C is a cross-sectional view of the stationary blade as taken in the vicinity of an external end portion.
  • FIGS. 11A to 11 C respectively show the structures and inclination angles of test axial-flow fans prepared for verifying the effects, which are obtained by defining inclination angles of the stationary blades in the vicinity of the external end portions thereof to be larger than those of the stationary blades in the vicinity of the internal end portions, and changing the inclination angle gradually from the vicinity of the external end portion toward the vicinity of the internal end portion.
  • FIG. 12 is a graphical chart showing measurement results of static pressure—airflow characteristics for the three fans shown in FIGS. 11A to 11 C (wherein the arrangements are the same except for the shape of the stationary blades and the number of rotations is kept constant).
  • FIG. 13 is a table showing the measurement results.
  • FIG. 14 is a graphical chart showing measurement results of static pressure—airflow characteristics for three fans which respectively use the stationary blades shown in FIGS. 11A to 11 C.
  • FIG. 15 is a table showing the measurement results.
  • FIG. 16 is a perspective view of a conventional axial-flow fan.
  • FIG. 17 is a rear view of the conventional axial-flow fan.
  • FIG. 1 is a perspective view of an axial-flow fan 1 according to an embodiment of the present invention as viewed from the right upper front side thereof, where lead wires are omitted.
  • FIG. 2 is a front view of the axial-flow fan 1 of the embodiment shown in FIG. 1
  • FIG. 3 is a rear view thereof.
  • FIG. 4 is a right-side view of the axial-flow fan 1 shown in FIG. 2 .
  • FIG. 5 is a cross-sectional view of the axial-flow fan 1 as taken along line 5 - 5 in FIG. 4 where an internal structure of a motor is omitted.
  • FIG. 1 is a perspective view of an axial-flow fan 1 according to an embodiment of the present invention as viewed from the right upper front side thereof, where lead wires are omitted.
  • FIG. 2 is a front view of the axial-flow fan 1 of the embodiment shown in FIG. 1
  • FIG. 3 is a rear view thereof.
  • FIG. 4 is a right-side view of the
  • FIG. 6 is a cross-sectional view of the axial-flow fan 1 as taken along line 6 - 6 in FIG. 4 where the internal structure of the motor is omitted.
  • FIG. 7 is a cross-sectional view of the axial-flow fan as taken along line 7 - 7 in FIG. 2 .
  • the axial-flow fan 1 comprises a fan housing 3 and an impeller 7 equipped with seven rotating blades 5 , which is rotatably disposed inside the fan housing 3 .
  • the axial-flow fan 1 further comprises a motor 9 and five stationary blades 11 A to 11 E.
  • the motor 9 comprises a rotor 9 A and a stator 9 B.
  • the rotor 9 A is mounted with the impeller 7 .
  • the rotor 9 A includes a rotating shaft 8 and a plurality of permanent magnets M which are fixed onto a peripheral wall portion of a cup-shaped member 12 fixedly mounted onto the rotating shaft 8 .
  • the stator 9 B includes a stator core and excitation windings wound around the stator core.
  • the stator 9 B is fixed to a motor case 10 .
  • a circuit board mounted with a circuit for supplying excitation current to the excitation windings is fixedly installed inside the motor case 10 .
  • the motor case 10 includes a bottom wall portion 10 A located at a side of an air discharge opening 16 which will be described later, and a peripheral wall portion 10 B continuously formed with the bottom wall portion 10 A and extending toward an air suction opening 14 which will be described later.
  • An outer surface of the bottom wall portion 10 A of the motor case 10 is composed of a flat bottom surface 10 C and an outer peripheral surface portion 10 D continuous with the flat bottom surface 10 C.
  • the outer peripheral surface portion 10 D is gradually curved from the bottom surface 10 C toward an outer peripheral surface of the peripheral wall portion 10 B.
  • the fan housing 3 has a suction-side flange 13 of an annular shape at one side in an extending direction of an axial line AL of the rotating shaft 8 (refer to FIG. 7 ) and a discharge-side flange 15 of an annular shape at the other side in the extending direction of the axial line.
  • the fan housing 3 also includes a cylindrical portion 17 between the flanges 13 and 15 .
  • An air channel 19 which has the air suction opening 14 and the air discharge opening 16 respectively disposed at either end thereof, is an internal space formed by the suction-side flange 13 , the discharge-side flange 15 and the cylindrical portion 17 .
  • a tapered surface 21 is formed inside the suction-side flange 13 as shown in FIG. 3 and FIG. 7 .
  • the tapered surface 21 is curved so that the distance between the axial line of the rotating shaft 8 and the tapered surface 21 gradually becomes larger toward the air suction opening 14 .
  • a space 22 is formed inside the suction-side flange 13 .
  • a tapered surface 23 is formed inside the discharge-side flange 15 as shown in FIG. 2 and FIG. 7 .
  • the tapered surface 23 is curved so that the distance between the axial line of the rotating shaft 8 and the tapered surface 23 gradually becomes larger toward the air discharge opening 16 .
  • a space 24 is formed inside the discharge-side flange 15 .
  • the suction-side flange 13 and the discharge-side flange 15 are respectively outlined in a substantially rectangular shape.
  • a through-hole allowing a screw to pass therethrough is formed each in four corners of each of the flanges.
  • the impeller 7 includes a rotating blade fixing member 6 of a cup-like shape. Seven rotating blades 5 are fixed onto a peripheral wall portion of the rotating blade fixing member 6 as shown in FIG. 7 .
  • the cup-shaped member 12 is fixed inside the peripheral wall portion of the rotating blade fixing member 6 , and the plurality of permanent magnets M constituting a part of the rotor of the motor 9 are fixed onto the peripheral wall of the cup-shaped member 12 .
  • FIG. 8 illustrates cross-sectional shapes of a rotating blade 5 and a stationary blade 11 C in order to explain the respective shapes of the rotating blade 5 and the stationary blade 11 A to 11 D.
  • an arrow of a solid line indicates a rotating direction of the rotating blade 5
  • arrows of broken lines respectively indicate the airflow direction.
  • FIG. 8 shows a cross-sectional view of the stationary blade 11 C as taken along line 8 - 8 in FIG. 2 .
  • FIG. 8 also shows a cross-sectional view of the rotating blade 5 as taken in the same manner as the cross-sectional view of the stationary blade 11 C.
  • Each of the seven rotating blades 5 is curved in such a manner that a concave portion 5 a is opened toward a rotating direction of the impeller 7 as shown FIG. 8 (clockwise as viewed in FIG. 2 ; counterclockwise as viewed in FIG. 3 ).
  • the stationary blade 11 C is curved in such a manner that a concave portion is opened toward a direction opposite to the rotating direction of the impeller 7 when viewed in the cross-sectional view taken along line 8 - 8 in FIG. 2 .
  • Each of the four stationary blades 11 A to 11 D has an external end portion 11 a connected to an inner wall portion of the fan housing 3 , an internal end portion 11 b connected to the peripheral wall portion 10 B of the motor case 10 , a discharge-side edge portion 11 c formed between the external end portion 11 a and the internal end portion 11 b and located at a side of the air discharge opening 16 , and a suction-side edge portion 11 d formed between the external end portion 11 a and the internal end portion 11 b and located at a side of the air suction opening 14 .
  • one blade 11 E of the stationary blades has a groove portion 27 that receives therein a plurality of lead wires 25 for supplying electric power to the excitation windings of the stator 9 B.
  • the groove portion 27 is opened toward the air discharge opening 16 .
  • the discharge-side edge portion 11 c of the one stationary blade 11 E is composed of two divided edges 11 c 1 and 11 c 2 respectively located at either side of the groove portion 27 .
  • the two divided edges 11 c 1 and 11 c 2 are inclined in the vicinity of the internal end portion 11 b so that the flat bottom surface 10 C of the bottom wall portion 10 A of the motor case 10 and the two divided edges 11 c 1 and 11 c 2 are flush with each other. With this arrangement, the lead wires 25 can be easily inserted into the groove portion 27 .
  • the outer surface (bottom surface 10 C) of the bottom wall portion 10 A of the motor case 10 is located closer to the air suction opening 14 than the discharge-side edge portions 11 c of the four stationary blades 11 A to 11 D are located.
  • the discharge-side edge portions 11 c of the four stationary blades 11 A to 11 D are located closer to the air discharge opening 16 than the outer surface (bottom surface 10 C) of the bottom wall portion 10 A of the motor case 10 is located.
  • FIG. 9 (A) in which airflow paths are indicated with arrows.
  • FIG. 9 (B) shows airflow paths when discharge-side edge portions 11 c′ of stationary blades 11 A′ to 11 D′ and the bottom surface of the bottom wall portion 10 A of the motor case 10 are flush with each other; i.e., the discharge-side edge portions 11 c and the bottom surface of the bottom wall portion 10 A of the motor case 10 are located at the same height.
  • a space S shown in FIG. 9 (B) is an area where the air does not flow.
  • each of the four stationary blades 11 A to 11 D is formed integrally with an extended portion 11 e that extends on the bottom wall portion 10 A of the motor case 10 .
  • Each of the extended portions 11 e has a guide surface 11 f for guiding a part of the air flowing along the stationary blades 11 A and 11 D toward the bottom surface 10 C of the bottom wall portion 10 A.
  • the guide surface 11 f extends along an outer peripheral surface portion 10 D which is curved from the outer surface of the peripheral wall portion 10 B of the motor case 10 toward the bottom surface 10 C of the bottom wall portion 10 A, and then extends on the bottom surface 10 C.
  • Such guide surface 11 f allows the air to be actively guided onto the bottom wall portion 10 C therealong.
  • the extended portion 11 e also has an extended guide surface 11 g , which is formed continuous with the guide surface 10 f and extending toward the rotating direction of the impeller 7 .
  • the extended guide surface 11 g facilitates the air, which has flown onto the bottom wall portion 10 C of the motor case 10 , to be smoothly flown out spirally from the air discharge opening 16 .
  • a dimensional difference in height between the bottom surface 10 C of the bottom wall portion 10 A of the motor case 10 and the discharge-side edge portions 11 c of the stationary blades 11 A to 11 E is preferably 3 mm or more.
  • a first virtual plane PS 1 is defined to extend in a radial direction, including thereon an inner end of the discharge-side edge portion 11 c of the stationary blade 11 A and a center line CL extending through the center of the rotating shaft 8 .
  • a second virtual plane PS 2 is defined to extend in a radial direction, including thereon an outer end of the discharge-side edge portion 11 c of the stationary blade 11 A and the center line CL.
  • a third virtual plane PS 3 is defined to extend in a radial direction, including thereon an outer end of the suction-side edge portion 11 d of the stationary blade 11 A and the center line CL. Then, the shape of each stationary blade 11 is determined so that both of the directions from the first virtual plane PS 1 toward the second virtual plane PS 2 and from the second virtual plane PS 2 toward the third virtual plane PS 3 are oriented toward a direction opposite to the rotating direction of the impeller 7 .
  • the four stationary blades 11 A to 11 D are arranged so that the inclination angle ⁇ 4 in the vicinity of external end portion 11 a is larger than the inclination angle ⁇ 3 in the vicinity of the internal end portion 11 b , and that the inclination angle is gradually changed from the vicinity of the external end portion 11 a toward the vicinity of the internal end portion 11 b . That is, each of the stationary blades 11 A to 11 D is shaped as if the external end portion 11 a is fixed and then the internal end portion 11 b is twisted clockwise with respected to the fixed external end portion 11 a as the external end portion 11 a is viewed from the internal end portion 11 b .
  • each of the stationary blades 11 A to 11 D is shaped as if the internal end portion 11 b is fixed and then the external end portion 11 a is twisted clockwise with respect to the fixed internal end portion 11 b as the internal end portion 11 b is viewed from the external end portion 11 a.
  • FIG. 10A is a fragmentary view of a stationary blade for illustrating an inclination angle.
  • FIG. 10B is a cross-sectional view, in which the stationary blade 11 D is cut off in the vicinity of the internal end portion 11 b
  • FIG. 10C is a cross-sectional view, in which the stationary blade 11 D is cut off in the vicinity of the external end portion 11 a .
  • a virtual plane PS 4 is defined to extend along the air discharge opening 16 .
  • orthogonal virtual planes PS 5 , PS 6 are defined to be respectively orthogonal to the virtual plane PS 4 and respectively orthogonal to the discharge-side edge portion 11 c and the suction-side edge portion 11 d .
  • Virtual line PL 1 is defined to pass through a first intersection CP 1 where the orthogonal virtual plane PS 5 intersects with the discharge-side edge portion 11 C, and also to pass through a second intersection CP 2 where the orthogonal virtual plane PS 5 intersects with the suction-side edge portion 11 d .
  • Virtual line PL 2 is defined to pass through another first intersection CP 11 where the orthogonal virtual plane PS 6 intersects with the discharge-side edge portion 11 C, and also to pass through another second intersection CP 12 where the orthogonal virtual plane PS 6 intersects with the suction-side edge portion 11 d .
  • an inclination angle is defined as an angle formed by the either of the virtual lines (PL 1 , PL 2 ) and the virtual plane PS 4 .
  • FIG. 10B shows an inclination angle ⁇ 3 which is measured when the stationary blade 11 D is cut off along the orthogonal virtual plane PS 5 in the vicinity of the internal end portion 11 b .
  • FIG. 10C shows an inclination angle ⁇ 4 which is measured when the stationary blade 11 D is cut off along the orthogonal virtual plane PS 6 in the vicinity of the internal end portion 11 b .
  • the inclination angle ⁇ 4 in the vicinity of the external end portion 11 a of each of the four stationary blades 11 A to 11 D is larger than the inclination angle ⁇ 3 in the vicinity of the internal end portion 11 b , and the inclination angle is gradually changed from the vicinity of the external end portion 11 a toward the vicinity of the internal end portion 11 b .
  • the angle of the inclination angle ⁇ 3 is preferably within a range of 45° to 55°, and the angle of the inclination angle ⁇ 4 is within a range of 50° to 60°.
  • the flow rate of the air discharged from the air discharge opening 16 of the axial-flow fan 1 tends to become faster in an area closer to the fan housing 3 (outer side) while the flow rate tends to become slower in an area closer to the motor case 10 (inner side). That is the reason why the stationary blades 11 A to 11 D are shaped as described above. This tendency is the same when stationary blades of a simpler shape are used.
  • the stationary blades 11 A to 11 D are arranged as described above, the flow rate of the air flowing in the vicinity of the internal end portions 11 b of the stationary blades 11 A to 11 D is increased relative to the flow rate of the air flowing in the vicinity of the external end portions 11 a of the stationary blades 11 A to 11 D.
  • the difference of these inclination angles may be appropriately determined depending on a desired flow rate.
  • FIGS. 11A to 11 C respectively shows a structure and inclination angles of test axial-flow fans prepared for verifying the effects which are obtained by defining inclination angles ⁇ 4 of the stationary blades in the vicinity of the external end portions thereof to be larger than inclination angles ⁇ 3 of the stationary blades in the vicinity of the internal end portions thereof, and changing the inclination angle gradually from the vicinity of the external end portion toward the vicinity of the internal end portion.
  • all the stationary blades 11 are of the same shape without using one of the blades as supporting means for the lead wires.
  • the discharge-side edge portions 11 c of the stationary blades 11 are arranged to be flush with the bottom wall portion 10 C of the motor case 10 . Furthermore, each of the stationary blades 11 is not formed with the extended portion. In the fan shown in FIG. 11A , the inclination angles of the stationary blades are arranged to be constant (57°) from the internal end portion to the external end portion. In the fan shown in FIG.
  • the inclination angle is arranged to be smaller (47°) at the side of the internal end portion of the stationary blade, the inclination angle is arranged to be larger (57°) at the side of the external end portion, and the inclination angle is arranged to gradually become larger from the internal end portion toward the external end portion.
  • the inclination angle is arranged to be larger at the side of the internal end portion of the stationary blades (57°)
  • the inclination angle is arranged to be smaller (47°) at the side of the external end portion
  • the inclination angle is arranged to gradually become smaller from the internal end portion toward the external end portion.
  • FIG. 14 is a graphical chart showing measurement results of static pressure—airflow characteristics for three fans which respectively use the stationary blades shown in FIGS. 11A to 11 C.
  • a table shown in FIG. 15 indicates changes in noise level, as measured as with the table shown in FIG. 13 .
  • one blade 11 E of the stationary blades is constructed to receive the lead wires 25 .
  • the stationary blade 11 E has the same structure as other stationary blades 11 A to 11 D. All of the stationary blades 11 a to 11 E may be twisted as described before.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Geometry (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US11/563,982 2005-11-30 2006-11-28 Axial-flow fan Abandoned US20070122271A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/136,228 US20140105763A1 (en) 2005-11-30 2013-12-20 Axial-flow fan

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005-346880 2005-11-30
JP2005346880A JP4664196B2 (ja) 2005-11-30 2005-11-30 軸流送風機

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US14/136,228 Continuation US20140105763A1 (en) 2005-11-30 2013-12-20 Axial-flow fan

Publications (1)

Publication Number Publication Date
US20070122271A1 true US20070122271A1 (en) 2007-05-31

Family

ID=38087735

Family Applications (2)

Application Number Title Priority Date Filing Date
US11/563,982 Abandoned US20070122271A1 (en) 2005-11-30 2006-11-28 Axial-flow fan
US14/136,228 Abandoned US20140105763A1 (en) 2005-11-30 2013-12-20 Axial-flow fan

Family Applications After (1)

Application Number Title Priority Date Filing Date
US14/136,228 Abandoned US20140105763A1 (en) 2005-11-30 2013-12-20 Axial-flow fan

Country Status (4)

Country Link
US (2) US20070122271A1 (https=)
JP (1) JP4664196B2 (https=)
CN (2) CN103742429A (https=)
TW (1) TWI391564B (https=)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070140844A1 (en) * 2005-12-19 2007-06-21 Nidec Corporation Axial Flow Fan
US20080118379A1 (en) * 2006-11-16 2008-05-22 Nidec Corporation Fan
US20080193287A1 (en) * 2007-01-18 2008-08-14 Nidec Corporation Housing, fan device, mold and method
US20090016878A1 (en) * 2007-07-10 2009-01-15 Delta Electronics, Inc. Fan and frame thereof
JP2010530949A (ja) * 2007-06-22 2010-09-16 サーモ キング ドイチュラント ゲーエムベーハー 陸上、道路、及び鉄道車両用の冷凍コンテナ
US20100242527A1 (en) * 2007-06-22 2010-09-30 Ole Thogersen Refrigerated container for ships
CN102094838A (zh) * 2009-12-14 2011-06-15 国立大学法人东京大学 双重反转式轴流鼓风机
US20110305565A1 (en) * 2007-04-17 2011-12-15 Sony Corporation Axial fan apparatus, housing, and electronic apparatus
US20120093635A1 (en) * 2007-10-31 2012-04-19 Nidec Corporation Axial flow fan
US20120308373A1 (en) * 2011-06-01 2012-12-06 Farlow Scott K Axial fan assembly
US20150030474A1 (en) * 2013-07-26 2015-01-29 Minebea Co., Ltd. Axial flow fan
EP2886384A1 (fr) * 2013-12-20 2015-06-24 Valeo Systemes Thermiques Ventilateur pour automobile comportant un stator
CN105056870A (zh) * 2015-08-14 2015-11-18 吉首大学 锰矿粉与硫酸反应的化合抽气系统
CN106523402A (zh) * 2016-11-22 2017-03-22 珠海格力电器股份有限公司 一种风扇
CN107850324A (zh) * 2015-07-10 2018-03-27 三星电子株式会社 风机以及具有该风机的空调
CN108019377A (zh) * 2016-11-04 2018-05-11 博泽（维尔茨堡）汽车零部件有限公司 扇框装置、包括扇框装置的散热器风扇模块及机动车辆
USD818103S1 (en) * 2014-12-02 2018-05-15 Ebm-Papst Mulfingen Gmbh & Co. Kg Ventilator
US11131324B2 (en) 2016-09-02 2021-09-28 Hewlett-Packard Development Company, L.P. Fan housing for reduced noise
US11480196B2 (en) * 2017-11-16 2022-10-25 Nidec Corporation Axial fan
US12151644B2 (en) 2014-07-21 2024-11-26 State Farm Mutual Automobile Insurance Company Methods of facilitating emergency assistance

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101201057A (zh) * 2007-06-15 2008-06-18 秦彪 电子芯片散热风扇
EP2691655B1 (de) * 2011-03-26 2016-05-18 ebm-papst St. Georgen GmbH & Co. KG Diagonalventilator
CN202612138U (zh) * 2011-12-28 2012-12-19 日本电产株式会社 轴流风扇
CN102734234B (zh) * 2012-07-18 2016-04-20 Tcl空调器(中山)有限公司 防护罩、风扇组件及空调器室外机
JP6143428B2 (ja) * 2012-08-31 2017-06-07 シャープ株式会社 送風装置
JP6225332B2 (ja) * 2013-12-04 2017-11-08 パナソニックＩｐマネジメント株式会社 送風機、およびその送風機を搭載した室外ユニット
DE102014219557A1 (de) * 2014-09-26 2016-03-31 Ksb Aktiengesellschaft Strömungsführendes Bauteil
WO2019146364A1 (ja) * 2018-01-29 2019-08-01 パナソニックＩｐマネジメント株式会社 送風装置
JP7213415B2 (ja) * 2018-01-29 2023-01-27 パナソニックＩｐマネジメント株式会社 送風装置
CN112128124A (zh) * 2020-09-28 2020-12-25 西南电子技术研究所（中国电子科技集团公司第十研究所） 电子设备风冷散热轴流冷却风机
JP7235996B2 (ja) * 2021-07-05 2023-03-09 ダイキン工業株式会社 送風装置及びそれを備えた空気調和システム
JP7638814B2 (ja) * 2021-07-20 2025-03-04 山洋電気株式会社 軸流ファン

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2224519A (en) * 1938-03-05 1940-12-10 Macard Screws Ltd Screw type fluid propelling apparatus
US5947683A (en) * 1995-07-11 1999-09-07 Mitsubishi Heavy Industries, Ltd. Axial compresssor stationary blade
US6045327A (en) * 1998-05-04 2000-04-04 Carrier Corporation Axial flow fan assembly and one-piece housing for axial flow fan assembly
US20030091435A1 (en) * 2001-11-14 2003-05-15 Sunonwealth Electric Machine Industry Co., Ltd. Housing structure of a fan
US6572346B2 (en) * 2001-09-24 2003-06-03 Hsieh Hsin-Mao Cooling fan
US20040228728A1 (en) * 2003-03-20 2004-11-18 Yi-Lung Kuo Fan for cooling a computer
US20040251000A1 (en) * 2003-05-30 2004-12-16 Shun-Chen Chang Heat-dissipating device and housing thereof
US20040251111A1 (en) * 2003-06-10 2004-12-16 Lecroy Donald L. Directional input device
USD506540S1 (en) * 2003-08-20 2005-06-21 Delta Electronics Inc. Fan
US7014420B2 (en) * 2001-08-01 2006-03-21 Delta Electronics Inc. Composite heat-dissipating system and its used fan guard with additional supercharging function
US20070122285A1 (en) * 2005-11-30 2007-05-31 Sanyo Denki Co., Ltd. Axial-flow fan
US20070253814A1 (en) * 2004-08-27 2007-11-01 Cin-Hung Lee Heat-dissipating fan and its housing
US7429162B2 (en) * 2004-08-27 2008-09-30 Delta Electronics, Inc. Fan

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB792369A (en) * 1955-01-24 1958-03-26 Airscrew Company & Jicwood Ltd Improvements in axial flow fans
DE19753373A1 (de) * 1996-12-10 1998-06-25 Papst Motoren Gmbh & Co Kg Axiallüfter-Gehäuse
JP3784178B2 (ja) * 1998-10-07 2006-06-07 山洋電気株式会社 軸流送風機
IT1304683B1 (it) * 1998-10-08 2001-03-28 Gate Spa Convogliatore d'aria per un elettroventilatore, particolarmente per ilradiatore di un autoveicolo.
CN2617972Y (zh) * 2003-04-09 2004-05-26 三匠科技股份有限公司 散热风扇的导流结构
KR100937929B1 (ko) * 2003-07-01 2010-01-21 한라공조주식회사 축류팬 쉬라우드의 스테이터
JP2005194900A (ja) * 2004-01-05 2005-07-21 Matsushita Electric Ind Co Ltd 静翼装置、この静翼装置の製造方法、及びこの静翼装置を有する電子機器
JP2006009617A (ja) * 2004-06-23 2006-01-12 Kiko Kagi Kofun Yugenkoshi 操作領域特性を向上するファン

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2224519A (en) * 1938-03-05 1940-12-10 Macard Screws Ltd Screw type fluid propelling apparatus
US5947683A (en) * 1995-07-11 1999-09-07 Mitsubishi Heavy Industries, Ltd. Axial compresssor stationary blade
US6045327A (en) * 1998-05-04 2000-04-04 Carrier Corporation Axial flow fan assembly and one-piece housing for axial flow fan assembly
US7014420B2 (en) * 2001-08-01 2006-03-21 Delta Electronics Inc. Composite heat-dissipating system and its used fan guard with additional supercharging function
US6572346B2 (en) * 2001-09-24 2003-06-03 Hsieh Hsin-Mao Cooling fan
US20030091435A1 (en) * 2001-11-14 2003-05-15 Sunonwealth Electric Machine Industry Co., Ltd. Housing structure of a fan
US20040228728A1 (en) * 2003-03-20 2004-11-18 Yi-Lung Kuo Fan for cooling a computer
US20040251000A1 (en) * 2003-05-30 2004-12-16 Shun-Chen Chang Heat-dissipating device and housing thereof
US7052236B2 (en) * 2003-05-30 2006-05-30 Delta Electronics, Inc. Heat-dissipating device and housing thereof
US20040251111A1 (en) * 2003-06-10 2004-12-16 Lecroy Donald L. Directional input device
USD506540S1 (en) * 2003-08-20 2005-06-21 Delta Electronics Inc. Fan
US20070253814A1 (en) * 2004-08-27 2007-11-01 Cin-Hung Lee Heat-dissipating fan and its housing
US7429162B2 (en) * 2004-08-27 2008-09-30 Delta Electronics, Inc. Fan
US20070122285A1 (en) * 2005-11-30 2007-05-31 Sanyo Denki Co., Ltd. Axial-flow fan

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070140844A1 (en) * 2005-12-19 2007-06-21 Nidec Corporation Axial Flow Fan
US8172524B2 (en) 2006-11-16 2012-05-08 Nidec Corporation Fan including specific stationary vane arrangement
US20080118379A1 (en) * 2006-11-16 2008-05-22 Nidec Corporation Fan
US20080193287A1 (en) * 2007-01-18 2008-08-14 Nidec Corporation Housing, fan device, mold and method
US20110305565A1 (en) * 2007-04-17 2011-12-15 Sony Corporation Axial fan apparatus, housing, and electronic apparatus
JP2010530949A (ja) * 2007-06-22 2010-09-16 サーモ キング ドイチュラント ゲーエムベーハー 陸上、道路、及び鉄道車両用の冷凍コンテナ
US20100242527A1 (en) * 2007-06-22 2010-09-30 Ole Thogersen Refrigerated container for ships
US20100251753A1 (en) * 2007-06-22 2010-10-07 Ole Thogersen Refrigerating container for land, road and rail vehicles
US20090016878A1 (en) * 2007-07-10 2009-01-15 Delta Electronics, Inc. Fan and frame thereof
US8485781B2 (en) * 2007-10-31 2013-07-16 Nidec Corporation Axial flow fan
US20120093635A1 (en) * 2007-10-31 2012-04-19 Nidec Corporation Axial flow fan
US20110142612A1 (en) * 2009-12-14 2011-06-16 The University Of Tokyo Counter-rotating axial flow fan
CN102094838A (zh) * 2009-12-14 2011-06-15 国立大学法人东京大学 双重反转式轴流鼓风机
US8690528B2 (en) * 2009-12-14 2014-04-08 The University Of Tokyo Counter-rotating axial flow fan
US20120308373A1 (en) * 2011-06-01 2012-12-06 Farlow Scott K Axial fan assembly
US8696305B2 (en) * 2011-06-01 2014-04-15 Deere & Company Axial fan assembly
US20150030474A1 (en) * 2013-07-26 2015-01-29 Minebea Co., Ltd. Axial flow fan
US10378547B2 (en) * 2013-07-26 2019-08-13 Minebea Co., Ltd. Axial flow fan
FR3015379A1 (fr) * 2013-12-20 2015-06-26 Valeo Systemes Thermiques Ventilateur pour automobile comportant un stator en amont de l'helice
EP2886384A1 (fr) * 2013-12-20 2015-06-24 Valeo Systemes Thermiques Ventilateur pour automobile comportant un stator
US12151644B2 (en) 2014-07-21 2024-11-26 State Farm Mutual Automobile Insurance Company Methods of facilitating emergency assistance
USD818103S1 (en) * 2014-12-02 2018-05-15 Ebm-Papst Mulfingen Gmbh & Co. Kg Ventilator
US10612563B2 (en) 2015-07-10 2020-04-07 Samsung Electronics Co., Ltd. Blower and air conditioner having the same
EP3299737A4 (en) * 2015-07-10 2018-12-05 Samsung Electronics Co., Ltd. Air blower and air conditioner having same
CN107850324A (zh) * 2015-07-10 2018-03-27 三星电子株式会社 风机以及具有该风机的空调
CN107850324B (zh) * 2015-07-10 2020-10-16 三星电子株式会社 风机以及具有该风机的空调
CN105056870A (zh) * 2015-08-14 2015-11-18 吉首大学 锰矿粉与硫酸反应的化合抽气系统
US11131324B2 (en) 2016-09-02 2021-09-28 Hewlett-Packard Development Company, L.P. Fan housing for reduced noise
CN108019377A (zh) * 2016-11-04 2018-05-11 博泽（维尔茨堡）汽车零部件有限公司 扇框装置、包括扇框装置的散热器风扇模块及机动车辆
US11078924B2 (en) * 2016-11-04 2021-08-03 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Frame device for a radiator fan module, radiator fan module comprising a frame device and motor vehicle comprising a radiator fan module of this type
CN106523402A (zh) * 2016-11-22 2017-03-22 珠海格力电器股份有限公司 一种风扇
US11480196B2 (en) * 2017-11-16 2022-10-25 Nidec Corporation Axial fan

Also Published As

Publication number Publication date
US20140105763A1 (en) 2014-04-17
TWI391564B (zh) 2013-04-01
JP4664196B2 (ja) 2011-04-06
JP2007154671A (ja) 2007-06-21
CN103742429A (zh) 2014-04-23
TW200734548A (en) 2007-09-16
CN1975180A (zh) 2007-06-06

Similar Documents

Publication Publication Date Title
US20140105763A1 (en) Axial-flow fan
JP2007154671A5 (https=)
EP2400157B1 (en) Centrifugal fan
JP5739200B2 (ja) 送風機
EP2317149A1 (en) Axial-flow blower
US20050207888A1 (en) Centrifugal fan and casing thereof
US7762767B2 (en) Axial-flow fan
JP2015086721A (ja) 遠心式ファン
US8764418B2 (en) Centrifugal fan
JP4871189B2 (ja) 軸流送風機
JP2007309313A5 (https=)
JP4469736B2 (ja) 軸流送風機
JP4397832B2 (ja) 軸流送風機
JP2016106197A (ja) 遠心式ファン
JP2008196504A (ja) 軸流送風機
HK1104846A (en) Axial-flow fan
HK1104847A (en) Axial-flow fan
JP2020133585A (ja) 遠心ファン
HK1112044B (en) Axial flow blower
HK1112043B (en) Axial flow blower

Legal Events

Date Code Title Description
AS Assignment

Owner name: SANYO DENKI CO., LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ISHIHARA, KATSUMICHI;OOSAWA, HONAMI;MIYAZAWA, MASASHI;AND OTHERS;REEL/FRAME:018559/0609

Effective date: 20061122

STCB Information on status: application discontinuation

Free format text: ABANDONED -- AFTER EXAMINER'S ANSWER OR BOARD OF APPEALS DECISION