CN102913466A - Cooling fan - Google Patents
Cooling fan Download PDFInfo
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- CN102913466A CN102913466A CN2011102181949A CN201110218194A CN102913466A CN 102913466 A CN102913466 A CN 102913466A CN 2011102181949 A CN2011102181949 A CN 2011102181949A CN 201110218194 A CN201110218194 A CN 201110218194A CN 102913466 A CN102913466 A CN 102913466A
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Abstract
The invention relates to a cooling fan for cooling electronic equipment. The cooling fan comprises a casing, a motor and an impeller, wherein the casing is used for holding and supporting the motor and the impeller, the motor is provided with a circuit substrate, a lead and the bottom surface of the circuit substrate are connected to a connecting point D, and the impeller is provided with a cup-shaped portion and a plurality of blades radially extending outwards from the outer circumferential surface of the cup-shaped portion. Each blade is provided with a radial inner edge, a radial outer edge and an axial bottom edge, wherein the radial inner edge is provided with a first axial lower end A, the radial outer edge is provided with a third axial lower end C, and the axial bottom edge extends between the first axial lower end A and the third axial lower end C and is provided with a second axial lower end B, at least part of the axial bottom edge is axially arranged below the connecting point D, and the second axial lower end B is arranged on the radial outer side of the first axial lower end A and below the axial outer side. Thus, the blades are prevented from contacting with the leads when the blades are enlarged and air quantity is increased.
Description
Technical field
The present invention relates in general to a kind of cooling fan, more specifically, relates to a kind of axial flow fan for cooling electronic apparatus, and the impeller blade of this fan is configured to not interfere with the wire that is positioned at the blade below.
Background technique
Cooling fan is used in a lot of electronic equipments (especially personal computer or server), the heat that these equipment that are used for leaving are in operation and produce.Usually, this class cooling fan comprise the motor that consisted of by stationary part and rotor portion, with impeller and the housing of a plurality of blades.Housing comprises: main body, and it forms the chamber of both ends open and has entrance point and outlet end, is used for holding motor and impeller; Base portion is positioned at the center of main body outlet end, is used for the stationary part of support motor; Base portion is connected to a plurality of flanks of main body.Impeller is attached to rotor portion, can rotate with rotor portion after giving electrical power, so that air-flow is come in from the entrance point of housing, along the chamber axial flow of housing, goes out from the outlet end of housing.
Generally, be connected to the bottom that wire one end between motor and the external power supply is connected to the circuit substrate of stationary part, derive from the opening of the base portion that is arranged in the circuit substrate below, derive towards outside along the flank below again.Like this, owing between the impeller blade of enclosure interior and wire, have flank, thus can maintain a certain distance between the lower axial end of blade and the wire, thus the possibility that interferes with each other reduced.In addition, put down in writing other the structure that is used for wire is drawn housing among the Chinese invention patent prospectus CN1603630A.
In addition, in order to control solid of rotation (rotor portion that comprises impeller and motor) by the magnetic field that detects motor internal, usually be provided with the rotational body position Detecting element at circuit substrate.Therefore, circuit substrate is arranged on the position nearer apart from the magnetic field generating unit of motor internal, to obtain more accurately measurement result.In this case, circuit substrate is distant with the base portion that is positioned at its axial below, and the wire that is connected with circuit substrate is derived along the flank below from the way of flank.That is to say, extend above flank at a part of wire of radially inner side, thereby be difficult to keep distance between blade lower end and the wire.And owing to following several reasons, more aggravated the problem that the distance between above-mentioned blade lower end and the wire is difficult to keep:
(1) enlarges blade, to improve the air quantity characteristic of cooling fan;
(2) blade is enlarged to axial downside, with the position of centre of gravity of adjustment impeller, thereby the polarity that increases rotor magnet and stator is controlled moving axially of impeller;
(3) motor is disposed in the housing, in the axial direction more near the entrance point of housing, so that the axial distance of circuit substrate and housing base portion is farther.
In view of above situation, need in above-mentioned cooling fan, avoid the lower end of impeller blade and contacting of wire.
Summary of the invention
Purpose of the present invention just provides a kind of cooling fan, can solve the problem that is in contact with one another between blade and the wire when blade enlarges.
Cooling fan of the present invention comprises: housing is used for holding and support motor and impeller; Motor has circuit substrate, and the bottom surface of wire and this circuit substrate is connected in tie point D; Impeller, a plurality of blades that have cupule and extend radially outwardly from the outer circumferential face of this cupule, each blade has: radial inner edge has the first axial low side A; Radially the outside has the 3rd axial low side C; And axial base, between the described first axial low side A and the described the 3rd axial low side C, to extend, described axial base has the second axial low side B; Wherein the described axial base of at least a portion is positioned at the axial below of described tie point D, and the wherein said second axial low side B is positioned at radial outside and the axial below of the described first axial low side A.Like this, enlarge at blade, when increasing air quantity, and can blade not occur and wire is in contact with one another.
Description of drawings
From the description of the exemplary that provides below in conjunction with accompanying drawing, can be expressly understood above and other of the present invention aspect, feature and advantage, in described accompanying drawing:
Fig. 1 shows the sectional view of the cooling fan of the first embodiment of the present invention.
Fig. 2 shows the worm's eye view of the cooling fan of Fig. 1, for clarity sake, has omitted the motor and the impeller that are positioned at enclosure interior.
Fig. 3 (a)-(e) shows the sectional view of the multiple modification of blade structure.
Fig. 4 shows the schematic diagram of the cooling fan of the second embodiment of the present invention.
Fig. 5 shows the schematic diagram of the cooling fan of the 3rd embodiment of the present invention.
Fig. 6 shows the schematic diagram of the cooling fan of the 4th embodiment of the present invention.
Fig. 7 shows the schematic diagram of the cooling fan of the 5th embodiment of the present invention.
Fig. 8 shows the schematic diagram of the cooling fan of the 6th embodiment of the present invention.
Fig. 9 shows the schematic diagram of the cooling fan of the 7th embodiment of the present invention.
Embodiment
Hereinafter specifically describe with reference to the accompanying drawings the embodiment of cooling fan of the present invention.In institute's drawings attached, same parts or structure will represent with identical reference character.Accompanying drawing is not necessarily drawn in proportion.Should be appreciated that the following examples and accompanying drawing only are illustrative, should not be regarded as limiting the scope of the invention.
The language of the expression direction such as upper and lower, interior and outer of mentioning in this specification only is for embodiment exemplarily being described according to the orientation in the accompanying drawing, not being intended to limit the present invention.The statement that persons of ordinary skill in the art may appreciate that this specification concerned direction hereinafter described can change according to the real work position.
Fig. 1 shows the sectional view of the cooling fan of the first embodiment of the present invention; Fig. 2 shows the worm's eye view of the cooling fan of Fig. 1.
As shown in Figure 1, the cooling fan motor 2 and the impeller 3 that comprise housing 1 and be positioned at housing 1 inside.Housing 1 has central axis X X, comprises main body 12, and main body 12 is formed for holding the chamber of motor 2 and impeller 3 and has upper air port one 2a and the lower port 12b that gives vent to anger, thus the formation gas flow channel.When cooling fan was worked, gas entered from upper air port one 2a, axially passes the chamber of main body 12, however under the port 12b that gives vent to anger discharge.In order to accelerate gas flow, according to the Venturi effect principle, described chamber can be configured as that the two ends radius is large, middle radius is less, namely two ends thick in the middle of thin shape.
Housing 1 also comprises the base portion 13 that is positioned at housing bottom and radial center.Base portion 13 is roughly disc-shape, is fixed on the housing 1 by a plurality of flanks 14 that extend to main body 12 from base portion 13.Usually, main body 12, base portion 13 and flank 14 are formed by injection moulding by the mode of resin material with one.Base portion 13 therein heart place is formed with the roughly bearing housing 13a of tubular, has been press-fitted radial bearing 15 in bearing housing 13a.Housing 1 also comprises mounting hole 16, passes this mounting hole such as the fastening piece of screw cooling fan is fixed on the electronic equipment.
Axle 21 is installed in the radial bearing 15 and by it at downside and supports rotationally.As the stator support of motor 2 parts on the periphery of bearing housing 13a.Stator comprises stator core 22, insulator 23, coil 24 and circuit substrate 25.The insulator 23 that stator core 22 is formed by insulating material surrounds, and coil 24 insulation ground are around stator core 22, and insulator 23 is between them.The driving of control impeller 3 and the circuit substrate 25 of rotation are arranged in the bottom of insulator 23, and the diameter of the external diameter of circuit substrate 25 and base portion 13 is roughly the same.One end of coil 24 is connected to the electronic unit on the circuit substrate 25.Wire 8 is connected to the bottom of circuit substrate 25 at a D place, by housing 1 inside, export to the outside of housing 1, is connected to the external power supply (not shown).Although wire 8 has single line in this exemplary, it also can have according to concrete requirement two or three or more lines.
Specifically referring to Fig. 2, housing 1 can also comprise wire holder 17.Wire holder 17 extends radially outwardly into the main body 12 of housing 1 from the base portion 13 of housing 1.Wire holder 17 can have plate-like shape, and its thickness can be approximately the twice of flank 14 greater than flank 14, and its width also can be greater than flank 14.Wire guide 17 forms a lead-in wire at lower surface and keeps raceway groove 17a.The degree of depth of this lead-in wire maintenance raceway groove 17a can be very approaching with width, thereby the wire (not shown) can be contained in wherein fully.For the ease of fixing cord, wire holder 17 can be in its radial inner end, namely with the joint of base portion 13, has recess 17b.Housing 1 can also comprise the groove 18 that radially extends, and it is formed in the bottom surface of main body 12., be stuck in recess 17b downwards from motor 2 wire 8 out and extend radially outwardly, be contained in lead-in wire and keep among the raceway groove 17a, continue horizontal radial and stretch out, pass groove 18, thereby derive from housing 1.Those of ordinary skills should be understood that the mode that the wire holder is not limited to illustrate.
Referring to Fig. 1, blade 32 comprises again: radial inner edge 32a, be positioned in this embodiment blade 32 and cupule 31 junctions, and this radial inner edge has the first axial low side A; 32c radially, at the outside free end in the footpath of blade 32, this radially has the 3rd axial low side C in the outside; Axially base 32b extends between the first axial low side A and the 3rd axial low side C, and this axial base has the second axial low side B.The second axial low side B is diametrically between the first axial low side A and the 3rd axial low side C.In other words, the second axial low side B is positioned at the radial outside of the first axial low side A, is positioned at the radially inner side of the 3rd axial low side C.The axial base 32b of at least a portion can be lower than the lower axial end 31b of cupule 31 in the axial direction, even is lower than circuit substrate 25, more even be lower than the tie point D of wire 8 and circuit substrate 25 bottoms.Like this, can increase blade area on the one hand, thereby can increase air quantity, can adjust on the other hand the position of centre of gravity of impeller, control moving axially of impeller thereby can strengthen magnetic attraction.In cooling fan of the present invention, the second axial low side B is located axially at the first axial low side A below, comes in contact with the axial base 32b that prevents wire 8 and blade.Although the 3rd axial low side C roughly is positioned at equal height with the second axial low side B in the axial direction in the embodiment that illustrates, those of ordinary skills should be understood that the 3rd axial low side C can be presented axially in the second axial low side B above or below.Although axially AB section and the BC section of base 32b all are straight line in the embodiment that illustrates, but those of ordinary skills should understand, AB section and BC section can have other shapes, curve shapes such as camber line, jaggies and various combinations thereof includes but not limited to disclosed shape in following each embodiment.
In Fig. 1, the lower axial end 31b of cupule 31 is positioned at the axial top of circuit substrate 25.At this moment, the axial base 32b of at least a portion is lower than the lower axial end 31b of cupule 31 in the axial direction.But according to actual needs, the lower axial end 31b that might be designed to cupule 31 is positioned at the axial below of circuit substrate 25.At this moment, should be appreciated that the axial base 32b of at least a portion of the blade of cooling fan of the present invention still is lower than the lower axial end 31b of cupule 31 in the axial direction.
Fig. 3 (a)-(e) shows the sectional view of the multiple modification of blade structure.Fig. 3 (a)-the 3rd axial low side C that (e) illustrates is positioned at the top of the second axial low side B, can prevent like this owing to the expansion blade so that impeller increases the weight of, thereby make the load of vane rotary become large, and current value worsens.The AB section that Fig. 3 (a) illustrates and BC section all are straight line.The AB section that Fig. 3 (b) illustrates is straight line, and the BC section is lower protruding camber line.The AB section that Fig. 3 (c) illustrates is straight line, and the BC section is the camber line of fovea superior.The AB section that Fig. 3 (d) illustrates and BC section are circular arc.The AB section that Fig. 3 (e) illustrates is the camber line of fovea superior, and the BC section is straight line.Those of ordinary skills should be understood that and can make change to the concrete shape of AB section and BC section according to actual needs.Such as height of the size of considering blade area or impeller position of centre of gravity etc.
Fig. 4 shows the schematic diagram of the cooling fan of the second embodiment of the present invention.As shown in the figure, the second axial low side B is positioned at the axial below of the first axial low side A and the 3rd axial low side C.Although the section of AB shown in Fig. 4 and BC section all are straight line, also can adopt to include but not limited to other shapes shown in Figure 3.At this moment, the first axial low side A can be positioned at the 3rd axial low side C axially above or below or essentially identical height.The wire 8 that is connected with the bottom of circuit substrate 25 intersects with wire holder 17 and by 17 guiding of wire holder axially downwards and extend radially outwardly.The intersection point of described wire holder and wire can be positioned at the radially inner side of the second axial low side B.
Fig. 5 shows the schematic diagram of the cooling fan of the 3rd embodiment of the present invention.As shown in the figure, the main body 12 of housing has axially downward diminishing upper air port one 2a, axial lower port 12b and the intermediate portion 12c between the two of giving vent to anger that enlarges gradually downwards.The point of interface of port 12b and intermediate portion 12c of giving vent to anger down is E.The first axial low side A can be positioned at the axial top of point of interface E.Should be appreciated that this moment, the second axial low side B and the 3rd axial low side C, and the shaft orientation relation of they and point of interface E is not limited to as shown in Figure 5.
Fig. 6 shows the schematic diagram of the cooling fan of the 4th embodiment of the present invention.As shown in the figure, wire 8 can, for example by scolding tin, plug and socket or other suitable means, be connected to the bottom of circuit substrate 25, tie point is D.Cupule 31 has outer radial periphery face 31c.Tie point D can be positioned at the radially inner side of outer radial periphery face 31c.Should be appreciated that this moment, the position relationship between the first axial low side A, the second axial low side B and the 3rd axial low side C is not limited to as shown in Figure 6, and can be position relationship for example shown in Figure 1.
Fig. 7 shows the schematic diagram of the cooling fan of the 5th embodiment of the present invention.The first axial distance between the tie point D of the first axial low side A and wire 8 and circuit substrate 25 is L1, and wherein the first axial low side A is positioned at the axial top of tie point D.Wire holder 17 has axial upper surface F.The second axial distance between the second axial low side B and the axial upper surface F is L2, and wherein the second axial low side B is positioned at the axial top of axial upper surface F.The first axial distance L1 can be greater than the second axial distance L2.Should be appreciated that this moment, the position relationship between the second axial low side B and the 3rd axial low side C is not limited to as shown in Figure 7, and can be position relationship for example shown in Figure 1.
Fig. 8 shows the schematic diagram of the cooling fan of the 6th embodiment of the present invention.Similar to the first embodiment shown in Figure 1, the cooling fan of the present embodiment comprises rotor magnet 27 and stator core 22.After the external power supply (not shown) was given electrical power by wire 8, the magnetic field center of rotor magnet 27 was O1, and the magnetic field center of stator is O2.Described blade is configured as so that the magnetic field center O1 of rotor magnet can be positioned at the axial upside of the magnetic field center O2 of stator.
Fig. 9 shows the schematic diagram of the cooling fan of the 7th embodiment of the present invention.As shown in the figure, the axial base AB section of blade 32 is straight line, and the bottom surface of its elongation line and housing forms the first intersection point Z1, and the first acute angle that forms with the bottom surface of housing is θ 1.The wire 8 that is connected with the bottom surface of circuit substrate 25 roughly extends along straight line in housing, and the bottom surface of its elongation line and housing forms the second intersection point Z2, with the acute angle of the bottom surface formation of housing be the second acute angle theta 2.Interfere for the AB section and the wire 8 that prevent blade, intersection point Z1 can be positioned at the radial outside of Z2.Perhaps, the first acute angle theta 1 is equal to or greater than the second acute angle theta 2.
Should be understood that, the each point position relationship in each embodiment is not mutually exclusive, can use separately, can carry out various forms of Combination application, thereby is conducive to better prevent blade and wire interference.
Cooling fan of the present invention has the following advantages.
Cooling fan of the present invention comprises: housing is used for holding and support motor and impeller; Motor has circuit substrate, and the bottom surface of wire and this circuit substrate is connected in tie point D; Impeller, a plurality of blades that have cupule and extend radially outwardly from the outer circumferential face of this cupule, each blade has: radial inner edge has the first axial low side A; Radially the outside has the 3rd axial low side C; And axial base, between the described first axial low side A and the described the 3rd axial low side C, to extend, described axial base has the second axial low side B; Wherein the described axial base of at least a portion is positioned at the axial below of described tie point D, and the wherein said second axial low side B is positioned at radial outside and the axial below of the described first axial low side A.Like this, by adjusting sharf to the shape on base, both can enlarge blade area, can prevent again that axial base from contacting with wire.
In an exemplary of the present invention, the described the 3rd axial low side C is positioned at radial outside and the axial top of the described second axial low side B.Like this by optimizing sharf to the shape on base, not only can effectively avoid and the contacting of wire, and prevent from owing to too enlarging blade impeller being increased the weight of, thereby make the vane rotary load become large, current value worsens.
In an exemplary of the present invention, described cupule has lower axial end, and the described axial base of at least a portion is positioned at the axial below of the lower axial end of described cupule.Because with respect to described cupule, the position of blade is conducive to the centre of gravity adjustment of impeller like this axially on the lower side.
In another exemplary of the present invention, described axial base is divided into AB section and BC section by the described second axial low side B, and wherein at least one is straight line for described AB section and described BC section, and perhaps wherein at least one is not straight line for described AB section and described BC section.Like this by to the multiple optimized project of sharf to the shape on base, effectively avoiding and the contacting simultaneously of wire, prevent the current value deterioration that causes because too enlarging blade.
In an exemplary of the present invention, described housing also comprises the wire holder, and the intersection point of described wire holder and wire is positioned at the radially inner side of the described second axial low side B.The clearer and more definite like this position of the second axial low side B can be avoided being in contact with one another of blade and wire more exactly.
In an exemplary of the present invention, described housing comprises main body, the give vent to anger point of interface E of port and described intermediate portion of lower port and the intermediate portion between the two of giving vent to anger that this main body has axial downward diminishing upper air port, axially enlarges gradually downwards, this time is positioned at the axial below of the described first axial low side A.The port in the situation that blade shape is given vent to anger under not affecting can be avoided sharf and contact with wire to the base like this.
In an exemplary of the present invention, described tie point D is positioned at the radially inner side of the outer circumferential face of described cupule.Like this because the oblique position of wire is positioned at radially inner side, so can avoid and sharf contacting to the base.
In an exemplary of the present invention, described wire holder has axial upper surface F, the first axial distance L1 between the described first axial low side A and the described tie point D is greater than the second axial distance L2 between the described second axial low side B and the described axial upper surface F, wherein the first axial low side A is positioned at the axial top of tie point D, and the second axial low side B is positioned at the axial top of axial upper surface F.So both blade area can be enlarged, sharf contacting to base and wire can be avoided again.
In an exemplary of the present invention, described motor comprises rotor magnet and stator, and described blade is configured as so that after giving described electrical power, the magnetic field center of described rotor magnet is positioned at the axial upside of the magnetic field center of described stator.Can improve polarity like this, control moving axially of impeller.
In an exemplary of the present invention, described axial base is divided into AB section and BC section by the described second axial low side B, described AB section is straight line, the bottom surface of its elongation line and described housing forms the first intersection point Z1, described wire is from axially downward and radially outward straight line extension of tie point D, the bottom surface of its elongation line and described housing forms the second intersection point Z2, and described the first intersection point Z1 is positioned at the radial outside of described the second intersection point Z2.In another exemplary of the present invention, the elongation line of described AB section and the bottom surface of described housing form the first acute angle theta 1, the elongation line of described wire and the bottom surface of described housing form the second acute angle theta 2, and described the first acute angle theta 1 is equal to or greater than described the second acute angle theta 2.So both blade area can be enlarged, sharf contacting to base and wire can be avoided again.
Be understandable that, present disclosure is not limited to above-mentioned embodiment.In the situation of the spirit and scope that do not depart from the present disclosure appended claims, can carry out multiple modification and transformation to present disclosure.
Claims (11)
1. a cooling fan is characterized in that, this cooling fan comprises:
Housing is used for holding and support motor and impeller;
Motor has circuit substrate, and the bottom surface of wire and this circuit substrate is connected in tie point D;
Impeller, a plurality of blades that have cupule and extend radially outwardly from the outer circumferential face of this cupule, each blade has:
Radial inner edge has the first axial low side A;
Radially the outside has the 3rd axial low side C; And
Axial base, the described first axial low side A and the described the 3rd axial low side C it
Between extend, described axial base has the second axial low side B;
Wherein the described axial base of at least a portion is positioned at the axial below of described tie point D, and the wherein said second axial low side B is positioned at radial outside and the axial below of the described first axial low side A.
2. cooling fan according to claim 1 is characterized in that, the described the 3rd axial low side C is positioned at radial outside and the axial top of the described second axial low side B.
3. cooling fan according to claim 1 and 2 is characterized in that, described cupule has lower axial end, and the described axial base of at least a portion is positioned at the axial below of the lower axial end of described cupule.
4. cooling fan according to claim 1 and 2, it is characterized in that, described axial base is divided into AB section and BC section by the described second axial low side B, and wherein at least one is straight line for described AB section and described BC section, and perhaps wherein at least one is not straight line for described AB section and described BC section.
5. cooling fan according to claim 1 and 2 is characterized in that, described housing also comprises the wire holder, and the intersection point of described wire holder and wire is positioned at the radially inner side of the described second axial low side B.
6. cooling fan according to claim 1 and 2, it is characterized in that, described housing comprises main body, the give vent to anger point of interface E of port and described intermediate portion of lower port and the intermediate portion between the two of giving vent to anger that this main body has axial downward diminishing upper air port, axially enlarges gradually downwards, this time is positioned at the axial below of the described first axial low side A.
7. cooling fan according to claim 1 and 2 is characterized in that, described tie point D is positioned at the radially inner side of the outer circumferential face of described cupule.
8. cooling fan according to claim 5, it is characterized in that, described wire holder has axial upper surface F, the first axial distance L1 between the described first axial low side A and the described tie point D is greater than the second axial distance L2 between the described second axial low side B and the described axial upper surface F, wherein the first axial low side A is positioned at the axial top of tie point D, and the second axial low side B is positioned at the axial top of axial upper surface F.
9. cooling fan according to claim 1 and 2, it is characterized in that, described motor comprises rotor magnet and stator, and described blade is configured as so that after giving described electrical power, the magnetic field center of described rotor magnet is positioned at the axial upside of the magnetic field center of described stator.
10. cooling fan according to claim 1 and 2, it is characterized in that, described axial base is divided into AB section and BC section by the described second axial low side B, described AB section is straight line, the bottom surface of its elongation line and described housing forms the first intersection point Z1, described wire is from axially downward and radially outward straight line extension of tie point D, and the bottom surface of its elongation line and described housing forms the second intersection point Z2, and described the first intersection point Z1 is positioned at the radial outside of described the second intersection point Z2.
11. cooling fan according to claim 10, it is characterized in that, the elongation line of described AB section and the bottom surface of described housing form the first acute angle theta 1, the elongation line of described wire and the bottom surface of described housing form the second acute angle theta 2, and described the first acute angle theta 1 is equal to or greater than described the second acute angle theta 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110218194.9A CN102913466B (en) | 2011-08-01 | 2011-08-01 | Cooling fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110218194.9A CN102913466B (en) | 2011-08-01 | 2011-08-01 | Cooling fan |
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| Publication Number | Publication Date |
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| CN102913466A true CN102913466A (en) | 2013-02-06 |
| CN102913466B CN102913466B (en) | 2015-04-08 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3640430B2 (en) * | 1995-04-18 | 2005-04-20 | ミネベア株式会社 | Axial fan |
| CN101699075A (en) * | 2009-05-05 | 2010-04-28 | 湖南天雁机械有限责任公司 | Cooling fan for traction transformer system of motor train unit train |
| US7824154B2 (en) * | 2006-06-09 | 2010-11-02 | Nidec Corporation | Motor having heat-dissipating structure for circuit component and fan unit including the motor |
| CN202187937U (en) * | 2011-08-01 | 2012-04-11 | 日本电产株式会社 | Cooling fan |
-
2011
- 2011-08-01 CN CN201110218194.9A patent/CN102913466B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3640430B2 (en) * | 1995-04-18 | 2005-04-20 | ミネベア株式会社 | Axial fan |
| US7824154B2 (en) * | 2006-06-09 | 2010-11-02 | Nidec Corporation | Motor having heat-dissipating structure for circuit component and fan unit including the motor |
| CN101699075A (en) * | 2009-05-05 | 2010-04-28 | 湖南天雁机械有限责任公司 | Cooling fan for traction transformer system of motor train unit train |
| CN202187937U (en) * | 2011-08-01 | 2012-04-11 | 日本电产株式会社 | Cooling fan |
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| CN102913466B (en) | 2015-04-08 |
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