EP1808604A1 - Electric fan - Google Patents
Electric fan Download PDFInfo
- Publication number
- EP1808604A1 EP1808604A1 EP06000674A EP06000674A EP1808604A1 EP 1808604 A1 EP1808604 A1 EP 1808604A1 EP 06000674 A EP06000674 A EP 06000674A EP 06000674 A EP06000674 A EP 06000674A EP 1808604 A1 EP1808604 A1 EP 1808604A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- engaging
- end segments
- hub
- units
- motor shaft
- 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.)
- Withdrawn
Links
- 238000007664 blowing Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
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
- F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
- F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using fans
-
- 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/263—Rotors specially for elastic fluids mounting fan or blower rotors on shafts
Definitions
- the invention relates to an electric fan, more particularly to an electric fan with a pair of blade units.
- a conventional electric fan is shown to include a motor 1, a pair of blade units 2 respectively driven by the motor 1, and a stand unit 3 for supporting a bottom of the motor 1.
- the blade units 2 rotate simultaneously so as to generate two streams of air flow blowing in opposite directions relative to an axis so as to dissipate heat.
- the object of the present invention is to provide an electric fan that is capable of overcoming the aforesaid drawback of the prior art.
- an electric fan of this invention comprises a motor, a pair of blade units, and a pair of engaging units.
- the motor has a motor shaft that defines an axis and that has two end segments which are axially opposite to each other. Each of the end segments has an engaging region. The engaging regions of the end segments of the motor shaft are disposed at angularly opposite positions relative to the axis.
- the blade units are coupled respectively to and are driven by the end segments of the motor shaft.
- Each of the blade units includes a hub that is sleeved on the respective one of the end segments, and a plurality of blades that extend from the hub.
- Each of the engaging units includes a first engaging member that is provided on the engaging region of a respective one of the end segments of the motor shaft, and a second engaging member that is provided on the hub of a respective one of the blade units and that engages the first engaging member, thereby securing the blade units to the end segments of the motor shaft, respectively.
- the first preferred embodiment of an electric fan according to the present invention is shown to include a motor 10, a pair of blade units 20, and a pair of engaging units 50.
- the first preferred embodiment further includes a stand unit 40 for supporting the motor 10.
- the stand unit 40 includes a connecting rod 41 coupled to a bottom of the motor 10, and a stand 42 connected to the connecting rod 41.
- the motor 10 has a motor shaft 11 that defines an axis (L) and that has two end segments 111 axially opposite to each other. Each of the end segments 111 has an engaging region 113. The engaging regions 113 of the end segments 111 of the motor shaft 11 are disposed at angularly opposite positions relative to the axis (L).
- the blade units 20 are coupled respectively to and are driven by the end segments 111 of the motor shaft 11.
- Each of the blade units 20 includes a hub 21 that is sleeved on a respective one of the end segments 111, and a plurality of blades 22 that extend from the hub 21.
- Each of the engaging units 50 includes a first engaging member 51 that is provided on the engaging region 113 of a respective one of the end segments 111 of the motor shaft 11, and a second engaging member 52 that is provided on the hub 21 of a respective one of the blade units 20 and that engages the first engaging member 51, thereby securing the blade units 20 to the end segments 111 of the motor shaft 11, respectively.
- each of the end segments 111 of the motor shaft 11 has a free end portion 112 with a non-circular cross-section.
- the free end portion 112 of each of the end segments 111 has a flat surface 116 that is disposed at the engaging region 113 and that defines the first engaging member 51 of the respective one of the engaging units 50.
- the hub 21 of each of the blade units 20 includes a sleeve part 212 that is sleeved on the respective one of the end segments 111 and that has a free end portion 213 with a non-circular cross-section.
- the free end portion 213 of the sleeve part 212 of the hub 21 of each of the blade units 20 has a flat surface 216 that defines the second engaging member 52 and that conforms to and that contacts the flat surface 116 of the free end portion 112 of the respective one of the end segments 111 of the motor shaft 11.
- the hub 21 of each of the blade units 20 further includes a hub base 210 and an outer annular wall 214 that extends axially from a periphery of the hub base 210 and that surrounds the sleeve part 212, which extends axially from an inner portion of the hub base 210.
- the hub base 210 has an inner side 2101 and an outer side 2102 that is opposite to the inner side 2101.
- the sleeve part 212 of the hub 21 of each of the blade units 20 further has an open outer end 211 that is opposite to the free end portion 213 of the sleeve part 212.
- Each of the end segments 111 of the motor shaft 11 has a threaded portion 114 that extends axially and outwardly through the open outer end 211 of the sleeve part 212 of the hub 21 of the respective blade unit 20.
- the electric fan further comprises a pair of screw nuts 30, each of which is disposed at the outer side 2102 of the hub base 210 of a respective blade unit 20and each of which engages threadedly the threaded portion 114 of a respective one of the end segments 111 of the motor shaft 11 so as to secure the blade units 20 to the end segments 111 of the motor shaft 11 after engagement between the first and second engaging members 51, 52 of the engaging units 50.
- each of the end segments 111 of the motor shaft 11 is formed with an engaging hole 116 that is disposed in the engaging region 113 and that defines the first engaging member 51 of the respective one of the engaging units 50.
- the sleeve part 212 of the hub 21 of each blade unit 20 is formed with a threaded hole 215.
- the second engaging member 52 of each of the engaging units 50 is in the form of a screw 30 that engages threadedly and that extends through the threaded hole 215 in the sleeve part 212 of the hub 21 of the respective one of the blade units 20 and that engages the engaging hole 116 in the respective one of the end segments 111 so as to secure the blade units 20 to the end segments 111 of the motor shaft 11 after engagement between the first and second engaging members 51, 52 of the engaging units 50.
- the sleeve part 212 of the hub 21 of each of the blade units 20 is formed with a blind hole 217 for insertion of the respective one of the end segments 111 of the motor shaft 11
- the third preferred embodiment of this invention differs from the first preferred embodiment in that: the engaging region 113 of each end segment 111 is formed with at least one engaging protrusion 116 (in this embodiment, two engaging protrusions 116 are formed on the engaging region 113) that defines the first engaging member 51 of the respective one of the engaging units 50.
- the sleeve part 212 of the hub 21 of each blade unit 20 has a free end portion 213 formed with an engaging groove 215 (in this embodiment, two engaging grooves 215 are formed in the free end portion 213 of the sleeve part 212) which extends axially, which opens in a direction toward the motor 10, and which defines the second engaging member 52 of the respective one of the engaging units 50.
- Each engaging protrusion 116 of each of the end segments 111 extends into the corresponding engaging groove 215 in the free end portion 213 of the sleeve part 212 of the hub 21 of the respective one of the blade units 20, as best shown in Figure 10, thereby securing the blade units 20 to the end segments 111 of the motor shaft 11.
Abstract
Description
- The invention relates to an electric fan, more particularly to an electric fan with a pair of blade units.
- Referring to Figure 1, a conventional electric fan is shown to include a motor 1, a pair of
blade units 2 respectively driven by the motor 1, and astand unit 3 for supporting a bottom of the motor 1. When the motor 1 is actuated, theblade units 2 rotate simultaneously so as to generate two streams of air flow blowing in opposite directions relative to an axis so as to dissipate heat. - Although the aforesaid electric fan is able to dissipate heat effectively, since only one motor 1 is used to simultaneously drive the two
blade units 2, vibration tends to occur during rotation of theblade units 2 when theblade units 2 mounted on two end portions of amotor axle 101 of the motor 1 are unbalanced. - Therefore, the object of the present invention is to provide an electric fan that is capable of overcoming the aforesaid drawback of the prior art.
- Accordingly, an electric fan of this invention comprises a motor, a pair of blade units, and a pair of engaging units.
- The motor has a motor shaft that defines an axis and that has two end segments which are axially opposite to each other. Each of the end segments has an engaging region. The engaging regions of the end segments of the motor shaft are disposed at angularly opposite positions relative to the axis.
- The blade units are coupled respectively to and are driven by the end segments of the motor shaft. Each of the blade units includes a hub that is sleeved on the respective one of the end segments, and a plurality of blades that extend from the hub.
- Each of the engaging units includes a first engaging member that is provided on the engaging region of a respective one of the end segments of the motor shaft, and a second engaging member that is provided on the hub of a respective one of the blade units and that engages the first engaging member, thereby securing the blade units to the end segments of the motor shaft, respectively.
- Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiments with reference to the accompanying drawings, of which:
- Fig. 1 is a fragmentary partly sectional view of a conventional electric fan;
- Fig. 2 is a fragmentary partly sectional view of the first preferred embodiment of an electric fan according to the present invention;
- Fig. 3 is an exploded partly sectional view of an assembly of a motor and a pair of blade units of the first preferred embodiment;
- Fig. 4 is a sectional view taken along the line IV -IV in Fig. 2;
- Fig. 5 is an exploded partly sectional view of the second preferred embodiment of an electric fan according to the present invention;
- Fig. 6 is a fragmentary assembled partly sectional view of the second preferred embodiment;
- Fig.7 is a sectional view taken along the line VII -VII in Fig. 6;
- Fig. 8 is an exploded partly sectional view of the third preferred embodiment of an electric fan according to the present invention;
- Fig. 9 is a fragmentary assembled partly sectional view of the third preferred embodiment; and
- Fig. 10 is a sectional view taken along the line X -X in Fig. 9.
- Before the present invention is described in greater detail with reference to the accompanying preferred embodiments, it should be noted herein that like elements are denoted by the same reference numerals throughout the disclosure.
- Referring to Figures 2 to 4, the first preferred embodiment of an electric fan according to the present invention is shown to include a
motor 10, a pair ofblade units 20, and a pair ofengaging units 50. The first preferred embodiment further includes astand unit 40 for supporting themotor 10. Thestand unit 40 includes a connectingrod 41 coupled to a bottom of themotor 10, and astand 42 connected to the connectingrod 41. - The
motor 10 has amotor shaft 11 that defines an axis (L) and that has twoend segments 111 axially opposite to each other. Each of theend segments 111 has anengaging region 113. Theengaging regions 113 of theend segments 111 of themotor shaft 11 are disposed at angularly opposite positions relative to the axis (L). - The
blade units 20 are coupled respectively to and are driven by theend segments 111 of themotor shaft 11. Each of theblade units 20 includes ahub 21 that is sleeved on a respective one of theend segments 111, and a plurality ofblades 22 that extend from thehub 21. - Each of the
engaging units 50 includes a firstengaging member 51 that is provided on theengaging region 113 of a respective one of theend segments 111 of themotor shaft 11, and a secondengaging member 52 that is provided on thehub 21 of a respective one of theblade units 20 and that engages the firstengaging member 51, thereby securing theblade units 20 to theend segments 111 of themotor shaft 11, respectively. - In the first embodiment, each of the
end segments 111 of themotor shaft 11 has afree end portion 112 with a non-circular cross-section. Thefree end portion 112 of each of theend segments 111 has aflat surface 116 that is disposed at theengaging region 113 and that defines the firstengaging member 51 of the respective one of theengaging units 50. Thehub 21 of each of theblade units 20 includes asleeve part 212 that is sleeved on the respective one of theend segments 111 and that has afree end portion 213 with a non-circular cross-section. Thefree end portion 213 of thesleeve part 212 of thehub 21 of each of theblade units 20 has aflat surface 216 that defines the secondengaging member 52 and that conforms to and that contacts theflat surface 116 of thefree end portion 112 of the respective one of theend segments 111 of themotor shaft 11. Moreover, thehub 21 of each of theblade units 20 further includes ahub base 210 and an outerannular wall 214 that extends axially from a periphery of thehub base 210 and that surrounds thesleeve part 212, which extends axially from an inner portion of thehub base 210. Thehub base 210 has aninner side 2101 and anouter side 2102 that is opposite to theinner side 2101. Thesleeve part 212 of thehub 21 of each of theblade units 20 further has an openouter end 211 that is opposite to thefree end portion 213 of thesleeve part 212. Each of theend segments 111 of themotor shaft 11 has a threadedportion 114 that extends axially and outwardly through the openouter end 211 of thesleeve part 212 of thehub 21 of therespective blade unit 20. The electric fan further comprises a pair ofscrew nuts 30, each of which is disposed at theouter side 2102 of thehub base 210 of a respective blade unit 20and each of which engages threadedly the threadedportion 114 of a respective one of theend segments 111 of themotor shaft 11 so as to secure theblade units 20 to theend segments 111 of themotor shaft 11 after engagement between the first and secondengaging members engaging units 50. - After assembly, since the
engaging units 50 are disposed at angularly opposite positions relative to the axis (L) , balance between theblade units 20 mounted respectively on theend segments 111 of themotor shaft 11 can be achieved, and vibration during actuation of themotor 10 can be reduced significantly. - Referring to Figures 5, 6 and 7, the second preferred embodiment of this invention differs from the first preferred embodiment in that: each of the
end segments 111 of themotor shaft 11 is formed with anengaging hole 116 that is disposed in theengaging region 113 and that defines the firstengaging member 51 of the respective one of theengaging units 50. Thesleeve part 212 of thehub 21 of eachblade unit 20 is formed with a threadedhole 215. The secondengaging member 52 of each of theengaging units 50 is in the form of ascrew 30 that engages threadedly and that extends through the threadedhole 215 in thesleeve part 212 of thehub 21 of the respective one of theblade units 20 and that engages theengaging hole 116 in the respective one of theend segments 111 so as to secure theblade units 20 to theend segments 111 of themotor shaft 11 after engagement between the first and secondengaging members engaging units 50. Moreover, thesleeve part 212 of thehub 21 of each of theblade units 20 is formed with ablind hole 217 for insertion of the respective one of theend segments 111 of themotor shaft 11 - Referring to Figures 8 to 10, the third preferred embodiment of this invention differs from the first preferred embodiment in that: the
engaging region 113 of eachend segment 111 is formed with at least one engaging protrusion 116 (in this embodiment, twoengaging protrusions 116 are formed on the engaging region 113) that defines the firstengaging member 51 of the respective one of theengaging units 50. Thesleeve part 212 of thehub 21 of eachblade unit 20 has afree end portion 213 formed with an engaging groove 215 (in this embodiment, twoengaging grooves 215 are formed in thefree end portion 213 of the sleeve part 212) which extends axially, which opens in a direction toward themotor 10, and which defines the secondengaging member 52 of the respective one of theengaging units 50. Eachengaging protrusion 116 of each of theend segments 111 extends into the correspondingengaging groove 215 in thefree end portion 213 of thesleeve part 212 of thehub 21 of the respective one of theblade units 20, as best shown in Figure 10, thereby securing theblade units 20 to theend segments 111 of themotor shaft 11. - By disposing the
engaging units 50 at the angularly opposite positions relative to the axis (L), the aforesaid drawback associated with the prior art can be alleviated.
Claims (5)
- An electric fan comprising:a motor (10) with a motor shaft (11) defining an axis (L) and having two end segments (111) that are axially opposite to each other, each of said end segments (111) having an engaging region (113), said engaging regions (113) of said end segments (111) being disposed at angularly opposite positions relative to said axis (L) ;a pair of blade units (20) coupled respectively to and driven by said end segments (111) of said motor shaft (11) , each of said blade units (20) including a hub (21) that is sleeved on the respective one of said end segments (111), and a plurality of blades (22) that extend from said hub (21); anda pair of engaging units (50) , each of which includes a first engaging member (51) that is provided on said engaging region (113) of a respective one of said end segments (111) of said motor shaft (11), and a second engaging member (52) that is provided on said hub (21) of a respective one of said blade units (20) and that engages said first engaging member (51), thereby securing saidblade units (20) to said end segments (111) of said motor shaft (11), respectively.
- The electric fan as claimed in Claim 1, wherein each of said end segments (111) of said motor shaft (11) has a free end portion (112) with a non-circular cross-section, said free end portion (213) of each of said end segments (111) having a flat surface (116) that defines said first engaging member (51) of the respective one of said engaging units (50), said hub (21) of each of said blade units (20) including a sleeve part (212) that is sleeved on the respective one of said end segments (111) and that has a free end portion (213) with a non-circular cross-section, said free end portion (213) of said sleeve part (212) of said hub (21) of each of said blade units (20) having a flat surface (216) that defines said second engaging member (52) and that conforms to and that contacts said flat surface (116) of said free end portion (112) of the respective one of said end segments (111) of said motor shaft (11).
- The electric fan as claimed in Claim 1, wherein each of said end segments (111) of said motor shaft (11) is formed with an engaging hole (116) that defines said first engaging member (51) of the respective one of said engaging units (50) , said hub (21) of each of said blade units (20) including a sleeve part (212) that is sleeved on the respective one of said end segments (111) and that is formed with a threaded hole (215) , said second engaging member (52) of each of said engaging units (50) being in the form of a screw (30) that engages threadedly and that extends through said threaded hole (215) in said sleeve part (212) of said hub (21) of the respective one of said blade units (20) and that engages said engaging hole (116) in the respective one of said end segments (111).
- The electric fan as claimed in Claim 1, wherein each of said end segments (111) of said motor shaft (11) is formed with an engaging protrusion (116) that defines said first engaging member (51) of the respective one of said engaging units (50), said hub (21) of each of said blade units (20) including a sleeve part (212) that is sleeved on the respective one of said end segments (111) and that has a free end portion (213) formed with an engaging groove (215) which extends axially, which opens in a direction toward said motor (10), and which defines said second engaging member (52) of the respective one of said engaging units (50), said engaging protrusion (116) of each of said end segments (111) extending into said engaging groove (215) in said free end portion (213) of said sleeve part (212) of said hub (21) of the respective one of said blade units (50).
- The electric fan as claimed in Claim 2, wherein said hub (21) of each of saidblade units (20) further includes a hub base (210) and an outer annular wall (214) that extends axially from a periphery of said hub base (210) and that surrounds said sleeve part (212) , said hub base (210) having an inner side (2101) and an outer side (2102) that is opposite to said inner side (2101), said sleeve part (212) of said hub (21) of each of said blade units (20) further having an open outer end (211) that is opposite to said free end portion (213) of said sleeve part (212), each of said end segments (111) of said motor shaft (11) having a threaded portion (114) that extends axially and outwardly through said open outer end (211) of said sleeve part (212) of said hub (21) of the respective one of said blade units (20), said electric fan further comprising a pair of screw nuts (30) , each of which is disposed at said outer side (2102) of said hub base (210) of a respective one of said blade units (20) and each of which engages threadedly said threaded portion (114) of a respective one of said end segments (111) of said motor shaft (11).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06000674A EP1808604A1 (en) | 2006-01-13 | 2006-01-13 | Electric fan |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06000674A EP1808604A1 (en) | 2006-01-13 | 2006-01-13 | Electric fan |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1808604A1 true EP1808604A1 (en) | 2007-07-18 |
Family
ID=36617261
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06000674A Withdrawn EP1808604A1 (en) | 2006-01-13 | 2006-01-13 | Electric fan |
Country Status (1)
Country | Link |
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EP (1) | EP1808604A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109944832A (en) * | 2019-04-02 | 2019-06-28 | 威海卓锐羽绒制品股份有限公司 | A kind of stable ventilation device |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2869651A (en) * | 1957-06-25 | 1959-01-20 | Gen Electric | Mounting arrangement for propeller type fan |
US3937595A (en) * | 1974-07-05 | 1976-02-10 | Torin Corporation | Rotary fluid moving device with improved hub construction and method of making same |
GB2014239A (en) | 1978-02-08 | 1979-08-22 | Chen Shean Huei | Double Fan |
FR2463300A1 (en) * | 1979-08-11 | 1981-02-20 | Bosch Gmbh Robert | Mounting overhung fan impeller on shaft - uses elastic centre bush fixed to centre bore of impeller and held on by spring clip |
US6224340B1 (en) * | 1998-02-20 | 2001-05-01 | Black & Decker, Inc. | Fan Retention system |
US20040213687A1 (en) * | 2003-04-28 | 2004-10-28 | Chung-Yin Cheng | Heat dissipating fan assembly |
-
2006
- 2006-01-13 EP EP06000674A patent/EP1808604A1/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2869651A (en) * | 1957-06-25 | 1959-01-20 | Gen Electric | Mounting arrangement for propeller type fan |
US3937595A (en) * | 1974-07-05 | 1976-02-10 | Torin Corporation | Rotary fluid moving device with improved hub construction and method of making same |
GB2014239A (en) | 1978-02-08 | 1979-08-22 | Chen Shean Huei | Double Fan |
FR2463300A1 (en) * | 1979-08-11 | 1981-02-20 | Bosch Gmbh Robert | Mounting overhung fan impeller on shaft - uses elastic centre bush fixed to centre bore of impeller and held on by spring clip |
US6224340B1 (en) * | 1998-02-20 | 2001-05-01 | Black & Decker, Inc. | Fan Retention system |
US20040213687A1 (en) * | 2003-04-28 | 2004-10-28 | Chung-Yin Cheng | Heat dissipating fan assembly |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109944832A (en) * | 2019-04-02 | 2019-06-28 | 威海卓锐羽绒制品股份有限公司 | A kind of stable ventilation device |
CN109944832B (en) * | 2019-04-02 | 2021-06-04 | 山东中鲁实业有限公司 | Ventilation unit that operation is stable |
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