EP0310391A2 - Axial flow fan - Google Patents
Axial flow fan Download PDFInfo
- Publication number
- EP0310391A2 EP0310391A2 EP88309047A EP88309047A EP0310391A2 EP 0310391 A2 EP0310391 A2 EP 0310391A2 EP 88309047 A EP88309047 A EP 88309047A EP 88309047 A EP88309047 A EP 88309047A EP 0310391 A2 EP0310391 A2 EP 0310391A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- yoke
- fan
- housing
- hub
- axial flow
- 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.)
- Granted
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
- F04D25/0633—Details of the magnetic circuit
-
- 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
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/64—Mounting; Assembling; Disassembling of axial pumps
- F04D29/644—Mounting; Assembling; Disassembling of axial pumps especially adapted for elastic fluid pumps
- F04D29/646—Mounting or removal of fans
Abstract
Description
- The present invention relates to an axial flow fan and, although it is not so restricted, it relates more particularly to an axial flow fan disposed in a casing of an office-automation instrument to circulate air therethrough so as to cool heated parts thereof.
- An axial flow fan is known comprising a rotary member provided with a fan member; a motor portion of an electric motor for rotating the rotary member; a circuit board carrying an electrical component or components for controlling the operation of the motor portion; and a housing having a housing portion to one side of which the rotary member and the motor portion are mounted. In the known axial flow fan, the motor portion and the circuit board are inserted into the housing from the same direction when they are assembled into a superposed structure.
- In such a structure, however, the central portion of the circuit board has a relatively large opening for the passage therethrough of a shaft support sleeve. For this reason, the circuit board has a limited amount of space available for electrical components and there is limited flexibility for the arrangement of these components. Further, the circuit board is disposed under and is covered by the motor portion so that it cannot be removed separately once it is assembled into the housing. Replacement, repair and adjustment of the circuit board are therefore difficult.
- It is also known to insert the yoke of the motor portion of a fan into the latter during moulding of an integrated rotor. In such insert-moulding, a cylindrical yoke is utilized having a linear wall. In order to form such a yoke, a metal plate is embossed by a press in the axial direction of the cylindrical yoke and thereafter the top end portion is cut by the press in a direction perpendicular to the axial direction. However, such cutting is difficult to perform and re-shaping may be needed subsequently so that the cost of production may be high. In addition, the end portion of the yoke has a sheared edge which makes the insertion of a magnet into the yoke difficult.
- According, therefore, to one aspect of the present invention, there is provided an axial flow fan comprising a rotary member provided with a fan member; a motor portion of an electric motor for rotating the rotary member; a circuit board carrying an electrical component or components for controlling the operation of the motor portion; and a housing having a housing portion to one side of which the rotary member and the motor portion are mounted characterised in that the circuit board is mounted on the opposite side of the housing portion, the axial flow fan having been assembled by introducing the rotary member and the motor portion into the housing from the said one side, and introducing the circuit board into the housing from the said opposite side.
- Preferably the rotary member comprises a hollow fan hub having an opening at one end thereof, and a hollow yoke disposed inside the hub, the hollow yoke having a tapered shape such that its internal diameter increases towards the said hub opening.
- The yoke may be insert-moulded into the fan hub.
- Preferably the inner diameter of the said opening of the fan hub is greater than that of the end of the yoke remote from said opening.
- According to another aspect of the present invention, there is provided an axial flow fan comprising a rotary member provided with a fan member, a hollow fan hub having an opening at one end thereof, and a hollow yoke disposed within the hub; and a motor portion for rotating the rotary member characterised in that the hollow yoke has a tapered shape such that its internal diameter increases towards the hub opening.
- The yoke may be cup-shaped having an end portion with an opening therein in which a portion of the hub is mounted.
- The yoke and hub may be moulded together to form an integral structure.
- The yoke is preferably provided at its larger end portion with a radiused surface to facilitate the introduction into the yoke of a magnet which forms part of the rotary member.
- The invention is illustrated, merely by way of example, in the accompanying drawings, in which:-
- Figure 1 is a sectional view of a known axial flow fan;
- Figure 2 is a sectional view of an axial flow fan according to the present invention,
- Figure 3 is a plan view of part of the structure shown in Figure 2 and showing a support face of a housing thereof for a circuit board;
- Figure 4 is a plan view of the said circuit board; and
- Figure 5 is a sectional view of a yoke forming part of the structure shown in Figure 2.
- As shown in Figure 1, a known axial flow fan has a
fan member 1, afan shaft 4, acoil 8, acore 9, aHall device 13, and acircuit board 10 to which thecoil 8 is connected by alead wire 15 and which is connected to a power source (not shown) by apower line 22. Thecircuit board 10 is secured to ahousing 12 by ascrew 24. Theparts circuit board 10 are inserted into thehousing 12 from the same direction when they are assembled into a superposed structure. - The fan shown in Figure 1, moreover, has a rotary member which, in addition to comprising the
fan member 1 andshaft 4, also comrpises ahollow fan hub 25 having an opening at its bottom end and ahollow yoke 2 disposed inside thehub 25, amagnet 3 being mounted in and carried by theyoke 2. Theyoke 2 and thehub 25 can be attached to each other by adhesive or by welding. - In such a structure, however, the central portion of the
circuit board 10 has a relatively large opening for the passage therethrough of asleeve 5 which is used to support theshaft 4 by way of a ball bearing 6. Because of this, thecircuit board 10 has a limited amount of effective space for electrical components and there is limited flexibility for the arrangement of these components. Further, thecircuit board 10 is disposed under and is covered by themotor portion circuit board 10 cannot be removed separately once it is assembled into thehousing 12. Replacement, repair and adjustment of thecircuit board 10 are therefore difficult. - In Figure 2 there is therefore shown an axial flow fan according to the present invention in which a
fan member 1 is insert-moulded together with ayoke 2, amagnet 3 and ashaft 4 to form an integrated rotary member. Asleeve 5 forms a shaft support portion of ahousing 12 having a substantially U-shaped base portion 12a. Inside thesleeve 5 there is mounted a ball bearing 6 and a ring 7 composed of oil-less metal. Thesleeve 5 supports about it a motor or drive portion of an electric motor for rotating the said rotary member, the motor portion comprising acoil 8 and acore 9 which holds thecoil 8. Thefan member 1 is mounted on theshaft 4 which is itself rotatably mounted in the sleeve orshaft support portion 5. Theshaft 4 is positioned in the thrust direction by means of astopper washer 21 which is engaged in a slit recess formed in the end of theshaft 4. - The above-mentioned members are assembled into the
housing 12 from the same direction (from the top side in Figure 2). Next, reference will be made to other members which are assembled from the bottom side in Figure 2. Acircuit board 10 is attached to and disposed below the base portion 12a of thehousing 12 by means of asole screw 24. Thecircuit board 10 has mounted thereon anelectronic component 20 for controlling the operation of themotor portion Hall device 13 is supported by and above thecircuit board 10 by way of asupport member 27 which is secured to the bottom of thecircuit board 10. TheHall device 13 is mounted in position by passing it through arectangular hole 14 in the base portion 12a of thehousing 12 so as to extend adjacent to a bottom face of thecore 9 which will thus be adjacent the top of theHall device 13. Alead wire 15 of thecoil 8 passes downwardly through around hole 16 in the base portion 12a of thehousing 12 and is attached to thecircuit board 10. Acavity 17 in the bottom surface of the base portion 12a of thehousing 12 is provided to receive therein a curved intermediate portion of thelead wire 15 so as to avoid the application of excessive stress to thecircuit board 10. A portion 18 of the base portion 12a of thehousing 12 is tapered to avoid vertical displacement of thecircuit board 10 at the radially opposite side thereof from thehousing 12 when thecircuit board 10 is fixed to thehousing 12 by means of thesole screw 24. Consequently, themotor portion circuit board 10, on the other hand, are separately assembled into thehousing 12 from opposite directions. Thelead wire 15 from the assembledmotor portion round hole 16 and is fitted into a peripheral recess 19 (Figure 4) of thecircuit board 10, being guided to the face ofcircuit board 10 and being connected thereat by welding. In a similar manner, apower line 22, which supplies electric power from the outside, is connected to thecircuit board 10. Thus thecircuit board 10 functions at least to interconnect thelead wire 15 and thepower line 22 to each other. - As shown in Figure 5, the
yoke 2 is a hollow cup-shaped member formed by emboss-pressing and thereafter punch-pressing in the same direction while leaving top and bottom edge portions. The thus formedyoke 2 is insert-moulded to form an integratedhollow hub 25 in which thebottom edge portion 2a of theyoke 2 surrounds the opening of thehollow hub 25. Theopening edge 2b of thehub 25 is made of moulded plastics and is disposed radially outside thebottom edge portion 2a of theyoke 2. Moreover, the inner diameter of thehub 25 at theopening edge 2b is greater than that of the end of theyoke 2 remote from theopening edge 2b. Theshaft 4 is also insert-moulded as a part of the integratedfan member 1. Themagnet 3 is formed with a step portion 3a for positioning it. Themagnet 3 is inserted through the bottom opening defined by thebottom edge portion 2a of theyoke 2 and is fixed to theyoke 2 by adhesive. In another embodiment, the thus formedyoke 2,magnet 3 andfan member 1 may be integrally moulded to form the rotary member. - As shown in Figure 5, the top end portion of an embossed or press-drawn cup-shaped metal member is punch-pressed in the direction of an arrow B parallel to that of the emboss-pressing while leaving a peripheral portion of the top end portion to form the
yoke 2. The thus formed yoke is insert-moulded with thehollow hub 25 so that thebottom end portion 2a of theyoke 2 has an opening diameter which is greater than that of the top end portion of theyoke 2 and which surrounds the opening of thehollow hub 25, as shown in Figure 2. Stated otherwise, plastics material is removed from the opening of thebottom end portion 2a of theyoke 2. - The
hollow yoke 2 has a tapered shape such that its internal diameter increases towards the hub opening. Theyoke 2 has anend portion 2c with anopening 2d therein in which a portion of thehub 25 is mounted. Theyoke 2 is provided at its larger end portion with thebottom edge portion 2a which is radiused to facilitate the introduction into theyoke 2 of themagnet 3. - The
motor portion shaft 4 are successively introduced into thehousing 12 from the same direction. Next, thecircuit board 10 is assembled into thehousing 12 from the opposite direction (i.e. from the bottom side as shown in Figure 2). - As indicated above, the
yoke 2 may be formed by embossing or by drawing and punching in the same press direction. The opening edge portion of the fan hub is curved outwardly so as to easily enable the insertion of themagnet 3 into theyoke 2. Namely, theyoke 2 has a top end portion having a sheared edge arranged inside the inner diameter of the yoke, and a bottom end portion having a sheared edge arranged outside the outer diameter of the yoke. - As described above, the motor or drive
portion circuit board 10, on the other hand, are separately sub-assembled, and are inserted into the upper and lower sections, respectively,of thehousing 12 from opposite directions so as to achieve the following advantages. - The respective components are efficiently assembled together to simplify production control. Specifically, sub-assembling of the
motor portion - The effective space provided on the
circuit board 10 is increased and cheap electronic components of large size having general utility can be utilized. The flexibility of circuit and pattern design is thus increased. In addition to advantages such as the increased ease of assembly of the circuit, thecircuit board 10 has sufficient space for the mounting of components such that thecircuit board 10 can be provided at its central portion with a small hole 23 (Figure 4) through which thestopper washer 21 can be removed so as to detach the rotational member 1-4 while leaving thecircuit board 10 as it is. - The
Hall device 13 is accurately positioned by means of the guiding effected through therectangular hole 14 to ensure magnetic coupling between theHall device 13 and thecore 9 of themotor portion - During the step of connecting the
lead wire 15 to thecircuit board 10, thelead wire 15 is temporarily fitted into theperipheral recess 19 and the end portion of thelead wire 15 is connected to thecircuit board 10 so as to simplify the connecting process. - Replacement, repair and adjustment of the
circuit board 10 due to defects in the electronic circuit or to a mis-match between the circuit board and themotor portion single screw 24. - Since the
yoke 2 is formed by embossing or drawing press work and punching press work in the same direction and theedge portion 2a surrounding the fan hub opening is curved radially outwardly, the number of working steps is reduced so as to reduce the production costs of theyoke 2 and so that the insertion of themagnet 3 into theyoke 2 can be simplified.
Claims (10)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15089887U JPH0158278U (en) | 1987-10-01 | 1987-10-01 | |
JP150898/87U | 1987-10-01 | ||
JP248845/87 | 1987-10-01 | ||
JP24884587A JPH0192599A (en) | 1987-10-01 | 1987-10-01 | Axial fan motor structure |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0310391A2 true EP0310391A2 (en) | 1989-04-05 |
EP0310391A3 EP0310391A3 (en) | 1990-05-09 |
EP0310391B1 EP0310391B1 (en) | 1992-05-27 |
Family
ID=26480337
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19880309047 Expired EP0310391B1 (en) | 1987-10-01 | 1988-09-29 | Axial flow fan |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0310391B1 (en) |
DE (1) | DE3871480D1 (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3939738A1 (en) * | 1989-12-01 | 1991-06-06 | Telefunken Electronic Gmbh | Electric motor with fan for motor vehicle cooling - has electronic control unit fitted with spacers around bolts to end of casing remote from fan |
DE4113198A1 (en) * | 1991-04-23 | 1992-10-29 | Oplaender Wilo Werk Gmbh | ELECTRIC MOTOR, IN PARTICULAR CANOPY MOTOR FOR A CENTRIFUGAL PUMP OR A FAN |
FR2676256A1 (en) * | 1991-05-11 | 1992-11-13 | Mulfingen Elektrobau Ebm | DRIVE UNIT FOR DUAL FAN. |
FR2714935A1 (en) * | 1994-01-05 | 1995-07-13 | Horng Alex | Electric fan |
EP1148247A2 (en) * | 2000-04-19 | 2001-10-24 | Minebea Co., Ltd. | Rotor mounting by means of caulking or spot welding |
EP1150017A2 (en) * | 2000-04-28 | 2001-10-31 | Minebea Kabushiki Kaisha | Blower |
DE10063619A1 (en) * | 2000-12-20 | 2002-06-27 | Trw Automotive Electron & Comp | Drive unit for fans in vehicles |
CN1900536B (en) * | 2005-07-18 | 2010-08-11 | 台达电子工业股份有限公司 | Fan and its fan frame |
CN101504012B (en) * | 2008-02-04 | 2012-01-04 | 台达电子工业股份有限公司 | Fan |
EP2793370A3 (en) * | 2013-04-17 | 2016-09-28 | Sanyo Denki Co., Ltd. | Fan motor |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2462596A1 (en) * | 1979-07-25 | 1981-02-13 | Paris & Du Rhone | IMPROVEMENTS IN PLASTIC ROTATING BODIES SUCH AS FANS |
EP0066158A1 (en) * | 1981-05-21 | 1982-12-08 | Nissan Motor Co., Ltd. | A cooling fan for an automotive vehicle engine cooling unit |
US4663549A (en) * | 1984-06-29 | 1987-05-05 | Canon Kabushiki Kaisha | Fan motor with a fan frame formed in part by a portion of a motor base |
-
1988
- 1988-09-29 DE DE8888309047T patent/DE3871480D1/en not_active Expired - Lifetime
- 1988-09-29 EP EP19880309047 patent/EP0310391B1/en not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2462596A1 (en) * | 1979-07-25 | 1981-02-13 | Paris & Du Rhone | IMPROVEMENTS IN PLASTIC ROTATING BODIES SUCH AS FANS |
EP0066158A1 (en) * | 1981-05-21 | 1982-12-08 | Nissan Motor Co., Ltd. | A cooling fan for an automotive vehicle engine cooling unit |
US4663549A (en) * | 1984-06-29 | 1987-05-05 | Canon Kabushiki Kaisha | Fan motor with a fan frame formed in part by a portion of a motor base |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3939738A1 (en) * | 1989-12-01 | 1991-06-06 | Telefunken Electronic Gmbh | Electric motor with fan for motor vehicle cooling - has electronic control unit fitted with spacers around bolts to end of casing remote from fan |
DE4113198A1 (en) * | 1991-04-23 | 1992-10-29 | Oplaender Wilo Werk Gmbh | ELECTRIC MOTOR, IN PARTICULAR CANOPY MOTOR FOR A CENTRIFUGAL PUMP OR A FAN |
FR2676256A1 (en) * | 1991-05-11 | 1992-11-13 | Mulfingen Elektrobau Ebm | DRIVE UNIT FOR DUAL FAN. |
US5258676A (en) * | 1991-05-11 | 1993-11-02 | Ebm Elektrobau Mulfingen Gmbh & Co. | Drive unit for double fan |
FR2714935A1 (en) * | 1994-01-05 | 1995-07-13 | Horng Alex | Electric fan |
EP1148247A3 (en) * | 2000-04-19 | 2002-11-06 | Minebea Co., Ltd. | Rotor mounting by means of caulking or spot welding |
US6511299B1 (en) | 2000-04-19 | 2003-01-28 | Minebea Co., Ltd. | Fan in which motor yoke is mounted by caulking or spot welding and the mounting method thereof |
US6786706B2 (en) | 2000-04-19 | 2004-09-07 | Minebea Co., Ltd. | Fan in which motor yoke is mounted on a motor shaft by caulking or spot welding |
EP1148247A2 (en) * | 2000-04-19 | 2001-10-24 | Minebea Co., Ltd. | Rotor mounting by means of caulking or spot welding |
EP1150017A3 (en) * | 2000-04-28 | 2003-01-15 | Minebea Kabushiki Kaisha | Blower |
EP1150017A2 (en) * | 2000-04-28 | 2001-10-31 | Minebea Kabushiki Kaisha | Blower |
US6916160B2 (en) | 2000-04-28 | 2005-07-12 | Minebea Kabushiki-Kaisha | Axial electric fan blower with electric components housing sealed from moisture, dirt and dust or other harmful gas |
US6762521B2 (en) | 2000-12-20 | 2004-07-13 | Trw Automotive Electronics & Components Gmbh & Co. Kg | Drive unit for a fan in a vehicle |
DE10063619A1 (en) * | 2000-12-20 | 2002-06-27 | Trw Automotive Electron & Comp | Drive unit for fans in vehicles |
DE10063619B4 (en) * | 2000-12-20 | 2010-02-18 | Trw Automotive Electronics & Components Gmbh & Co. Kg | Drive unit for blowers in vehicles |
CN1900536B (en) * | 2005-07-18 | 2010-08-11 | 台达电子工业股份有限公司 | Fan and its fan frame |
CN101504012B (en) * | 2008-02-04 | 2012-01-04 | 台达电子工业股份有限公司 | Fan |
EP2793370A3 (en) * | 2013-04-17 | 2016-09-28 | Sanyo Denki Co., Ltd. | Fan motor |
US10465692B2 (en) | 2013-04-17 | 2019-11-05 | Sanyo Denki Co., Ltd. | Fan motor |
Also Published As
Publication number | Publication date |
---|---|
EP0310391A3 (en) | 1990-05-09 |
DE3871480D1 (en) | 1992-07-02 |
EP0310391B1 (en) | 1992-05-27 |
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