CN108302053A

CN108302053A - In-line arrangement aerofoil fan

Info

Publication number: CN108302053A
Application number: CN201810030755.4A
Authority: CN
Inventors: 箱崎将吾; 山县亮太
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2017-01-12
Filing date: 2018-01-12
Publication date: 2018-07-20
Also published as: US20180195526A1

Abstract

The present invention provides a kind of in-line arrangement aerofoil fan, has：First aerofoil fan blows out the air sucked from air inlet side from exhaust side；And second aerofoil fan, it is connected to the first aerofoil fan along the central shaft of the first aerofoil fan and blows out the air sucked from air inlet side from exhaust side, the end of the exhaust side of above-mentioned the first aerofoil fan of in-line arrangement aerofoil fan pair and the end of the air inlet side of the second aerofoil fan are connected, and, first impeller has multiple first blades for extending to radial outside and circumferentially arranging, second impeller has multiple second blades for extending to radial outside and circumferentially arranging, the at least one party of first blade and the second blade has auxiliary blade portion.Moreover, when the number of the first blade is set as Nin, the number of the second blade is set as to Nout and the number of the first ribs and the second ribs is set as Nrib, meet Nin ＜ Nout ＜ Nrib.

Description

In-line arrangement aerofoil fan

Technical field

This disclosure relates to the in-line arrangement aerofoil fan that aerofoil fan is directly connected to.

Background technology

Currently, the cooling fan as the cooling electronic unit being configured inside the framework of electronic equipment, uses axis stream Fan.With the increase of the calorific value brought by the high performance of electronic unit, the ministry of electronics industry brought by the miniaturization etc. of framework The rising of the configuration density of part, it is desirable that the static pressure and air quantity of cooling fan increase.In order to increase the static pressure of cooling fan with And air quantity, proposition, which has, exists two (multiple) aerofoil fans similar to recorded in Japanese Kokai special open 2007-303432 The in-line configuration aerofoil fan of in-line connection in axial direction.

Moreover, the dual reversal-rotating type axial blower of patent document 2 have the first impeller of suction side, discharge side second Impeller and the static blade that the position between the first impeller and the second impeller is configured at static state.Moreover, disclosing When the number of the blade of the first impeller is five, the number of static blade is three and the number of the second impeller is four, Static pressure is got higher air quantity.

In recent years, the calorific value from electronic unit is continuously increased, and is configured at the close of electronic unit inside framework Benefit of subsisting is got higher.Then, the part of the mutual narrow gaps of forming member configures other ministrys of electronics industry in the back side of electronic unit Part, to which the wind from in-line configuration aerofoil fan is difficult to reach inside framework sometimes.Since air-flow is difficult to reach, exist The possibility that the cooling of electronic unit becomes inadequate.

Invention content

The purpose of the present disclosure is to provide a kind of in-line arrangement aerofoil fans, can improve relative to the quiet of input shaft power Pressure and air quantity, and being capable of mute.

Invention content

The illustrative in-line arrangement aerofoil fan of the disclosure has：First aerofoil fan, the sky that will be sucked from air inlet side Gas is blown out from exhaust side；And second aerofoil fan, along above-mentioned first aerofoil fan center axis connection and will be from air inlet The air of side sucking is blown out from exhaust side, above-mentioned in-line arrangement aerofoil fan to the end of the exhaust side of above-mentioned first aerofoil fan and The end of the air inlet side of above-mentioned second aerofoil fan is connected, moreover, above-mentioned first aerofoil fan has：First impeller, It is around above-mentioned center axis rotation；First motor part makes above-mentioned first impeller rotate；First shell, it includes surround above-mentioned the First canister portion of the radial outside of one impeller；And first ribs, extend inwardly from the inner surface of above-mentioned first canister portion, And above-mentioned first motor part is supported, above-mentioned first impeller has multiple for extending to radial outside and circumferentially arranging One blade, above-mentioned second aerofoil fan have：Second impeller, around above-mentioned center axis rotation；Second motor part makes above-mentioned Two impellers rotate；Second housing, it includes the second canister portions of the radial outside for surrounding above-mentioned second impeller；And with above-mentioned first Ribs extend from the inner surface of above-mentioned second canister portion with the second ribs of quantity and support above-mentioned second motor inwardly Portion, above-mentioned second impeller has multiple second blades for extending to radial outside and circumferentially arranging, in above-mentioned first leaf At least one party of piece and above-mentioned second blade has auxiliary blade portion, the number of above-mentioned first blade is set as Nin, will be upper When stating the number of the second blade and being set as Nout and the number of above-mentioned first ribs and above-mentioned second ribs is set as Nrib, Meet Nin ＜ Nout ＜ Nrib.

According to the in-line arrangement aerofoil fan of the illustrative disclosure, can improve relative to input shaft power static pressure and Air quantity, and being capable of mute.

There is the detailed description of the preferred embodiment for the present invention below, with reference to attached drawing, can be more clearly understood that the present invention Above-mentioned and other feature, element, step, features and advantages.

Description of the drawings

Fig. 1 is the stereogram of an example of the in-line arrangement aerofoil fan of the disclosure.

Fig. 2 is by in-line arrangement aerofoil fan shown in FIG. 1 with the sectional view of the face cut-out comprising central shaft.

Fig. 3 is the stereogram from upside of the first aerofoil fan.

Fig. 4 is the stereogram from downside of the first aerofoil fan.

Fig. 5 is the exploded perspective view of the first aerofoil fan shown in Fig. 3.

Fig. 6 is by the first aerofoil fan shown in Fig. 3 with the sectional view of the face cut-out comprising central shaft.

Fig. 7 is the stereogram from upside of the second aerofoil fan.

Fig. 8 is the stereogram from downside of the second aerofoil fan.

Fig. 9 is the exploded perspective view of the second aerofoil fan shown in Fig. 7.

Figure 10 is by the second aerofoil fan shown in Fig. 7 with the sectional view of the face cut-out comprising central shaft.

Specific implementation mode

Hereinafter, with reference to attached drawing, the illustrative embodiment of the disclosure is explained in detail.In addition, in this specification, straight In column aerofoil fan 1, the direction parallel with the central shaft J1 of in-line arrangement aerofoil fan 1 is known as " axial direction ", it will be with in-line arrangement The direction that the central shaft J1 of aerofoil fan 1 is orthogonal is known as " radial direction ", in being along the central shaft J1 with in-line arrangement aerofoil fan 1 The direction of the circular arc of the heart is known as " circumferential direction ".In addition, in in-line arrangement aerofoil fan 1, it will be axially set as upper and lower directions, with Fig. 1 institutes On the basis of the state shown, definition upside IS, downside OS.In addition, upper and lower directions is the title for explanation, in-line arrangement axis is not limited Position relationship under the use state of flow fan 1 and direction.

Hereinafter, illustrating the in-line arrangement aerofoil fan of the illustrative embodiment of the disclosure.Fig. 1 is the in-line arrangement of the disclosure The stereogram of an example of aerofoil fan.Fig. 2 is cuing open with the face cut-out comprising central shaft by in-line arrangement aerofoil fan shown in FIG. 1 View.Fig. 1 and in-line arrangement aerofoil fan 1 shown in Fig. 2 suck air from the end of upside IS.Then, the air of sucking exists The inside of in-line arrangement aerofoil fan 1 compressed and (or) accelerate, and from the end of downside OS be discharged.In addition, the following description In, upside is known as air inlet side sometimes, downside is known as exhaust side.

As shown in Figure 1 and Figure 2, in-line arrangement aerofoil fan 1 has the first aerofoil fan 2 and the second aerofoil fan 3.First Aerofoil fan 2 is configured at the upside of the second aerofoil fan 3.In other words, the first aerofoil fan 2 is configured at the second aerofoil fan 3 Air inlet side.In addition, in in-line arrangement aerofoil fan 1, the first aerofoil fan 2 and the second aerofoil fan 3 are in-line along central shaft J1 Connection.That is, the center of the first aerofoil fan 2 and the second aerofoil fan 3 is consistent with central shaft J1.

The upside IS of first aerofoil fan 2 and the second aerofoil fan 3 is respectively air inlet side, and downside OS is respectively to be vented Side.Moreover, the exhaust side of the first aerofoil fan 2 is connect in the second aerofoil fan 3 with suction side.That is, from the first aerofoil fan 2 The air of aftermentioned first exhaust portion 2302 that the end face of downside OS has discharge is from the end face of the upside IS of the second aerofoil fan 3 Aftermentioned second intake section 3301 having is inhaled into.

That is, the first aerofoil fan 2 blows out the air sucked from air inlet side from exhaust side.In addition, 3 edge of the second aerofoil fan The central shaft j1 connections of the first aerofoil fan 2, and the air sucked from air inlet side is blown out from exhaust side.Moreover, in-line arrangement Aerofoil fan 1 connects the end of the exhaust side of the first aerofoil fan 2 with the end of the air inlet side of the second aerofoil fan 3.

Fig. 3 is the stereogram from upside of the first aerofoil fan.Fig. 4 is the first aerofoil fan from downside Stereogram.Fig. 5 is the exploded perspective view of the first aerofoil fan shown in Fig. 3.Fig. 6 be by the first aerofoil fan shown in Fig. 3 with Include the sectional view of the face cut-out of central shaft.As shown in Fig. 3~Fig. 6, the first aerofoil fan 2 has the first impeller 21, the first horse Up to portion 22, the first shell 23 and multiple first ribs 24.

First shell 23 is the exterior body of the first aerofoil fan 2, protects the first impeller 21 and the first motor part 22 etc..

First shell 23 has the first canister portion 230, the first air inlet flange portion 2311 and first exhaust flange part 2321.The One canister portion 230 is the cylinder from the perforation of upper end 231 to lower end 232 along central shaft J1.The upper end of first canister portion 230 231 be the first intake section 2301, and lower end 232 is first exhaust portion 2302.As shown in Fig. 3~Fig. 6, the first canister portion 230 is in circle The peripheral surface of cylinder has four medial planes 236 with shape made of the plane cut-out parallel with central shaft J1.Medial plane 236 configure at equal intervals in the circumferential.Medial plane 236 is the plane parallel with central shaft J1.

In first aerofoil fan 2, the first impeller 21 is rotated in the inside of the first canister portion 230 around central shaft J1, generates air-flow. It is, the first canister portion 230 is a part for exterior body, and it is also wind-tunnel.That is, the first shell 23 includes to surround the first impeller First canister portion 230 of 21 radial outside.In addition, the first impeller 21 is rotated around central shaft J1.

First air inlet flange portion 2311 is provided to the upper end 231 of the first shell 23.First air inlet flange portion 2311 is in The mandrel side J1 has a rectangular shape when looking up, the interior path length of the length on one side than the first canister portion 230.First air inlet flange portion 2311 corner part when the central shaft side J1 looks up is extended from the periphery of the first canister portion 230 towards radial outside.Here, Corner part is the part in the corner for having square shape, and is comprising corner and includes the area in the circumferential with fixed width The part in domain.Hereinafter, for corner part, it is set as identical as above-mentioned corner part.In addition, being looked up in the central shaft side J1 When, the face for constituting the side in the first air inlet flange portion 2311 of square shape is flushed with medial plane 236.

First exhaust flange part 2321 is provided to the lower end 232 of the first shell 23.First exhaust flange part 2321 is in The mandrel side J1 has a rectangular shape when looking up, the interior path length of the length on one side than the first canister portion 230.First exhaust flange part 2321 corner part when the central shaft side J1 looks up is extended from the periphery of the first canister portion 230 towards radial outside.In addition, When the central shaft side J1 looks up, face and the medial plane 236 on the side of the first exhaust flange part 2321 of square shape are constituted It flushes.Moreover, when the central shaft side J1 looks up, the first air inlet flange portion 2311 and first exhaust flange part 2321 are overlapped.

First canister portion 230 has the first inside diameter 233 and the second inside diameter 234.First inside diameter 233 is configured at than second Inside diameter 234 leans on air inlet side, i.e. upside IS.First inside diameter 233 is tubular, and internal diameter D11 does not change in the axial direction.First The minimum diameter of canister portion 230 is internal diameter D11.That is, the first inside diameter 233 is minimum diameter part.Second inside diameter 234 is first 232 side of lower end, the i.e. end of exhaust side are configured in canister portion 230.Second inside diameter 234 has diameter than the first inside diameter 233 big parts.Second inside diameter 234 be overlapped part is inner side plane 2341 radially with medial plane 236, will in The part that side plane 2341 connects in the circumferential each other is inner curve 2342.The inner curve 2342 of second inside diameter it is most lower Side is in arc-shaped with the section cut off with the face of orthogonality of center shaft, and is internal diameter D12.Moreover, the internal diameter of the first inside diameter 233 D11 is smaller than the internal diameter D12 of the inner curve 2342 of the second inside diameter 234.

Inner curve 2342 has conus portion 235.Conus portion 235 is a part for the inner surface of cone, and to downside I.e. exhaust side is expanding.

First aerofoil fan 2 has 11 the first ribs 24.11 the first ribs 24 are from the second inside diameter 234 Extend to radially inner side, and configures at equal intervals in the circumferential.After the radially inner side of first ribs 24 and the first motor part 22 The basal part 2221 stated connects.The first motor part 22 is supported in the first shell 23 using the first ribs 24 as a result,.First shell 23, the first ribs 24 and basal part 2221 are the resin molded bodies being integrally formed using resin.In first aerofoil fan 2, First ribs 24 are configured at the lower end side of the first shell 23.That is, the inner circumferential of the first ribs 24 from the first canister portion 230 is inward-facing Side extends, and supports the first motor part 22.

When the central shaft side J1 looks up, the first ribs 24 are configured at the inside of the first canister portion 230.Then, cross-section At least part of the air-flow generated in the inside of the first canister portion 230 by the rotation of the first impeller 21.Pass through the first impeller 21 rotation and the air-flow that generates has axial velocity component, it is and with the direction of the first impeller 21 rotation, i.e., circumferential Velocity component.Therefore, the first ribs 24 have air-flow will not by the circumferential velocity component of air-flow adverse current direction, i.e., Downside is located at the gradient that direction of rotation downstream side is leaned on than upside IS.It is described in detail below, but is being connected to first axle When flow fan 2 and the second aerofoil fan 3, the first ribs 24 and the second ribs 34 constitute stator blade, to air-flow in axial direction Upper carry out rectification.That is, the first ribs 24 support the first motor part 22, and it is also the stator blade that rectification is carried out to air-flow.

First motor part 22 is so-called outer-rotor type.As shown in fig. 6, the first motor part 22 has the first rotor portion 221 With the first stator department 222.First motor part 22 makes the first impeller 21 rotate.

First stator department 222 has basal part 2221, bearing cage 2222, armature 2223 and circuit board 2224. Basal part 2221 is formed with the first shell 23 and the first ribs 24 as integrally formed body.Basal part 2221 is and center Orthogonal disk-shaped of axis J1, and the J1 overlappings of Center-to-Center axis.Bearing cage 2222 is cylindrical, is configured at basal part 2221 Central portion, and to upside IS extend.The body in addition, bearing cage 2222 can also be one of the forming with basal part 2221. The top of the inside of bearing cage 2222 and lower part installation ball bearing 2225 and ball bearing 2226.Moreover, passing through ball axis 2225 and ball bearing 2226 are held, the aftermentioned axis 2213 in the first rotor portion 221 can be pivotally supported.In addition, ball bearing 2225 and ball bearing 2226 be Bearning mechanism an example, be not limited to this.Widely used axis 2213 can be supported as The bearing for the construction that can be rotated.

Armature 2223 is fixed on the radial outside of bearing cage 2222.Armature 2223 has stator core 2227, coil 2228 and insulator 2229.Stator core 2227 is the laminated body for being laminated electromagnetic steel plate in the axial direction.In addition, stator Iron core 2227 is not limited to laminated body made of laminated electromagnetic steel plate, such as can also be that the sintered body of powder, cast body etc. are single One component.

Stator core 2227 has the cricoid core back of the body and multiple (here, nine) teeth.Nine teeth from the periphery that core is carried on the back towards Radial outside extends, and is formed as radial.Nine teeth circumferentially configure as a result,.Coil 2228 is by being equipped with insulator Surrounding's coiled electrical conductor of 2229 each tooth and constitute.

Enter bearing cage 2222 in the core back pressure of stator core 2227, in 2222 fixed stator iron core of bearing cage 2227.Indentation can also be so-called tight fit, can also be the light indentation weaker than tight fit of the power of indentation, so-called transition matches It closes.The core back of the body can also be other methods such as Nian Jie with the fixation of bearing cage 2222.Stator core 2227 is being fixed in axis When holding maintaining part 2222, the J1 overlappings of Center-to-Center axis.Moreover, in order to keep the first motor part 22 smooth and efficiently rotate, Nine teeth of stator core 2227 are arranged at equal intervals in circumferential direction.

Circuit board 2224 is installed in basal part 2221.The coil 2228 of circuit board 2224 and the first stator department 222 Electrical connection.Circuit board 2224 includes the driving circuit of driving coil 2228.

The basal part 2221 of first stator department 222 and the first ribs 24 are one of the forming body.First stator department as a result, 222 i.e. the first motor parts 22 are supported in the first ribs 24.In addition, the first ribs 24 are also one of the forming with the first shell 23 Body.Therefore, the first motor part 22 is connect via the first ribs 24 with the first shell 23, in other words, is supported in the first shell 23。

The first rotor portion 221 has yoke 2211, magnetic field magnet 2212, axis 2213 and axis fixing component 2214.Magnetic Yoke 2211 is made of metal, and has lid cylindric in centered on central shaft J1.Center in the lid portion of yoke 2211 is fixed There is axis fixing component 2214.Axis 2213 is fixed on axis fixing component 2214 by fixing means such as indentations.In addition, fixing means It is not limited to be pressed into, can also be other methods such as bonding.That is, yoke 2211 is solid via axis fixing component 2214 and axis 2213 It is fixed.

Magnetic field 2212 cylindrical shape of magnet.Magnetic field magnet 2212 is fixed on the inner surface of yoke 2211.It uses in magnetic field The poles N and the poles S of magnet 2212 alternating magnetization in the circumferential.In addition it is also possible to instead of the magnetic field magnet 2212 of cylindrical shape, and Be arranged multiple magnetic field magnet in the circumferential.

Axis 2213 is made of metal, and cylindrical.Axis 2213 is supported via ball bearing 2225 and ball bearing 2226 It can be rotated to be the first stator department 222 relative to bearing cage 2222.Bearing cage 2222 can be rotatably supported at Axis 2213 Center-to-Center axis J1 overlapping.

In first motor part 22, axis 2213 is supported for rotate via ball bearing 2225 and ball bearing 2226, from And the first rotor portion 221 can be rotatably supported at the first stator department 222 around central shaft J1.At this point, the magnetic in the first rotor portion 221 Field is separated opposed with gap radially with the radially-outer surface of the inner radial surface of magnet 2212 and stator core 2227.For The details of the action of first motor part 22, followed by narration.

As shown in figs.5 and 6, the first impeller 21 has multiple first blades 211, cup shell 212 and auxiliary blade Portion 213.Cup shell 212 is in have lid cylindric.In addition, although to be formed with lid cylindric for cup shell 212, however, not limited to this, Can be different in the axial direction with the outer diameter of peripheral surface, such as in circular cone shape.

First blade 211 is protruded from the radially-outer surface of cup shell 212 to radial outside.In first impeller 21, the first leaf Piece 211 has five.Five the first blades 211 equally spaced arrange in the circumferential.That is, the first impeller 21 has to radial outside Multiple first blades 211 for extending and arranging in the circumferential.First blade 211 is revolved in peripheral, oblique by the first impeller 21 Turn, to generate the air-flow flowed from the upper side to the lower side.In other words, the first blade 211 to make air-flow from upside IS to downside The direction of generation tilts.The face of the exhaust side of first blade 211 is that the face of downside is pressure face.In addition, the first blade 211 into The face of gas side is that the face of upside IS is suction surface.

Moreover, auxiliary blade portion 213 is provided to the radial outer edge of the first blade 211.With this configuration, Neng Gouli Vortex is generated with auxiliary blade portion 213, inhibits the inner surface of the radial outer edge and the first canister portion 230 in auxiliary blade portion 213 Gap air adverse current.For details, followed by narration.Auxiliary blade portion 213 is formed in the outer rim of the first blade 211 The whole region from direction of rotation front end to direction of rotation rear end in portion.It with this configuration, can be in the whole of the first blade 211 A outer edge obtains the effect for the raising pressure brought by auxiliary blade portion 213.Thereby, it is possible to be improved the effect of pressure. In addition, compared in a case where part for outer edge forms auxiliary blade portion 213, manufacture sometimes becomes easy.Moreover, auxiliary Blade part 213 towards radial outside and to axial upside be air inlet lateral bend.With this configuration, simple shape can be passed through Auxiliary blade portion improve pressure.In addition, compared with the structure in additional additional installation auxiliary blade portion, it is simple to manufacture.

In first aerofoil fan 2, using auxiliary blade portion 213, inhibit air in the radial outer edge of the first blade 211 Inflow from from pressure face side to negative pressure surface side.In addition, the details of the action for the flowing of inhibition air, followed by narration.

As above-mentioned, the first stator department 222 of the first motor part 22 passes through in the basal part being integrally formed with the first shell 23 2221 install bearing cages 2222, armature 2223 and circuit board 2224 and assemble.That is, the first stator department 222 is via One ribs 24 are supported in the first shell 23.

Then, the yoke 2211 in the first rotor portion 221 is fixed in the inside of the cup shell 212 of the first impeller 21.Yoke 2211 fixation to cup shell 212 can also be carried out by being pressed into, and can also be bonding.Alternatively, it is also possible to tight by screw etc. Gu component carries out.Cup shell 212 is fixed on yoke 2211 in a manner of inhibiting the deviation with yoke 2211.That is, the first impeller 21 It is fixed on the first rotor portion 221.

Then, the axis 2213 in the first rotor portion 221 for being fixed with the first impeller 21 is fixed on and is installed on bearing cage The ball bearing 2225 of 2222 inside and the inner ring of ball bearing 2226.In addition, axis 2213 is to ball bearing 2225 and ball bearing The fixation of 2226 inner ring is carried out by being pressed into, and but not limited thereto.For example, widely used can be bonded, weld etc. and can press down Axis processed 2213 it is opposite with inner ring move and make the fixing means that axis 2213 is rotated around central shaft J1.As above, it is equipped with The first rotor portion 221 of first impeller 21 can be rotatably mounted to the first stator department 222.

By the way that the first rotor portion 221 is installed on the first stator department 222, to which the first impeller 21 is accommodated in the first shell 23 Inside.The radial outside in the auxiliary blade portion 213 of the radial outer edge of the first blade 211 is provided to radially with the The inner surface of one canister portion 230 is opposed.

From the driving circuit for being installed on circuit board 2224 electric current is in time supplied to the coil 2228 of the first motor part 22. The first rotor portion 221 of the first motor part 22 is rotated with scheduled direction as a result,.In addition, here, from the IS of upside central shaft When J1, the direction of rotation in the first rotor portion 221 is counterclockwise.

It is rotated around central shaft J1 by the first motor part 22, to be fixed on first impeller 21 in the first rotor portion 221 It is rotated around central shaft J1.By the rotation of the first impeller 21, in the first shell 23, in other words, in the inside of the first canister portion 230 Generate the air-flow for circling round and flowing in the axial direction in the circumferential.

By the rotation of the first impeller 21, the first blade 211 pushes air.Therefore, the face of the downside of the first blade 211 (face of exhaust side) is pressure face, and the face (face of air inlet side) of upside IS is suction surface.First blade 211 of the first impeller 21 is Five, the first blade 211 is larger relative to the inclination of central shaft J1.Therefore, the pressure difference of pressure face and suction surface becomes larger.

In first aerofoil fan 2, between the inner surface of the radial outer edge and the first canister portion 230 of the first blade 211 separates Unoccupied place is opposed radially.Therefore, when the rotation of the first impeller 21, pressure is generated between the pressure face and suction surface of the first blade When poor, in the radial outer edge of the first blade 211, from pressure face side to negative pressure surface side, i.e., it is easy from downside OS to upside IS Generate air stream.

Has auxiliary blade portion 213 in the radial outer edge of the first blade 211.Auxiliary blade portion 213 is to upside IS (air inlet side) is bent.When the first impeller 21 rotates, using auxiliary blade portion 213, the radial outer rim in auxiliary blade portion 213 Portion and the gap of the inner surface of the first canister portion 230 generate vortex.By the vortex, inhibit the outer edge in auxiliary blade portion 213 with In the gap of the inner surface of first canister portion 230 from downside air stream to the upper side.As a result, by inhibiting to the upper side from downside Air stream, to inhibit pressure face and suction surface pressure difference reduction, i.e. the pressure loss.As a result, 2 energy of the first aerofoil fan Enough air-flows that high pressure is discharged from first exhaust portion 2302.

Vortex is formed in the gap of the radial outer edge of the inner surface and auxiliary blade portion 213 of the first canister portion 230, is passed through The vortex inhibits the air in gap adverse current.In order to effectively inhibit the inner surface and auxiliary in the first canister portion 230 by vortex The air of the gap adverse current of the radial outer edge of blade part 213, preferably reduce as far as possible the inner surface of the first canister portion 230 with it is auxiliary Help the gap of the radial outer edge of blade part 213.Additionally, it is preferred that the inner surface of the first canister portion 230 and auxiliary blade portion 213 The gap uniformity of radial outer edge.In addition, between the inner surface and the radial outside in auxiliary blade portion 213 of the first canister portion 230 Gap also includes the uneven of the degree for the action for not influencing the first aerofoil fan 2 uniformly not only comprising accurately uniform situation The case where.With this configuration, gap can be inhibited locally to become larger.Inhibit gap locally to change as a result, keeps pressure flat It weighs, the first impeller 21 can swimmingly rotate, and inhibit vibration, noise etc..That is, can be mute by in-line arrangement aerofoil fan 1 Change.

It, can by making the gap uniformity of the inner surface of the first canister portion 230 and the radial outer edge in auxiliary blade portion 213 Inhibit the unevenness of the effect by swirl suppression adverse current.The pressure balance in the circumferential direction of the first impeller 21 is difficult to destroy as a result,.Its As a result, it is possible to the first impeller 21 is made swimmingly to rotate, can inhibit vibration and (or) noise.That is, can be by in-line arrangement axis stream 1 mute of fan.

Auxiliary blade portion 213 is accommodated in the inside of the axial length of the first canister portion 230.Auxiliary blade portion 213 and first Portion 230 is reliably opposed, therefore, it is possible to promote the effect for improving pressure.In addition, being accommodated in cylinder by auxiliary blade portion 213 Inside, to formed radially with the inner surface of the first canister portion 230 equally spaced gap auxiliary blade portion 213 shape Become simple.In this way, the first impeller of easy to manufacture 21.In addition, by the way that by auxiliary blade portion 213, opposed face is made radially Cylinder can inhibit the variation of pressure and flow velocity to which the variation of the outer diameter of auxiliary blade 213 becomes smaller.Also can as a result, Promote the effect of the pressure for the air-flow for improving discharge.

In first aerofoil fan 2, preferably the radial outer rim in auxiliary blade portion 213 radially with the first canister portion 230 The inner surface of first inside diameter 233 is opposed.That is, it is preferred that in the inner surface of the first canister portion 230 and the second canister portion 330 at least in diameter The part opposed with auxiliary blade portion 213 is cylinder upwards.The outer diameter of the part opposed with auxiliary blade portion 213 of canister portion 233 Variation it is less, therefore, pressure, flow velocity are difficult to change, and can improve pressure.

In addition it is also possible to which auxiliary blade portion 213 is opposed with the second inside diameter 234 radially.In this case, auxiliary lobe The shape of the outer rim in piece portion 213 is also between making the radial outer rim and the inner surface of the second inside diameter 234 in auxiliary blade portion 213 The outer rim of gap and the radial direction in auxiliary blade portion 213 shape equal with the gap of inner surface of the first inside diameter 233.Pass through this Sample is constituted, can obtain above-mentioned inhibition vibration and (or) effect of noise.That is, can be mute by in-line arrangement aerofoil fan 1 Change.

In addition, in the first impeller 21, auxiliary blade portion 213 be formed in the radial outer edge of the first blade 211 from rotation Turn direction front end to direction of rotation rear end whole region.The pressure loss is reduced as a result, is improved and is discharged from first exhaust portion 2302 Air-flow pressure.On the other hand, as long as the pressure for the air-flow being also discharged sometimes from first exhaust portion 2302 is the height of certain degree Degree.It in this case, can also be from the direction of rotation front end of the radial outer edge of the first blade 211 to direction of rotation Rear end is formed locally auxiliary blade portion 213.In this way, the pressure for the air-flow being discharged from first exhaust portion 2302 can be adjusted Power.Furthermore it is preferred that the part for forming auxiliary blade portion 213 is formed in identical part in multiple first blades 211.Pass through this Sample is constituted, and the distribution of the pressure caused by the auxiliary blade portion 213 in each first blade 211 can be made same or about, Obtain the balance for the pressure for acting on the first impeller 21.Thereby, it is possible to inhibit vibration and (or) noise.That is, can will be in-line 1 mute of formula aerofoil fan.

Fig. 7 is the stereogram from upside of the second aerofoil fan.Fig. 8 is the second aerofoil fan from downside Stereogram.Fig. 9 is the exploded perspective view of the second aerofoil fan shown in Fig. 7.Figure 10 be by the second aerofoil fan shown in Fig. 7 with Include the sectional view of the face cut-out of central shaft.As shown in Fig. 7~Figure 10, the second aerofoil fan 3 has the second impeller 31, the second horse Up to portion 32, second housing 33 and multiple second ribs 34.

Second housing 33 is the exterior body of the second aerofoil fan 3 and in-line arrangement aerofoil fan 1, protection the second impeller 31 with And second motor part 32 etc..

Second housing 33 has the second canister portion 330, the second air inlet flange portion 3311 and second exhaust flange part 3321.The Two canister portions 330 are the cylinder from the perforation of upper end 331 to lower end 332 along central shaft J1.The upper end of second canister portion 330 331 be the second intake section 3301, and lower end 332 is second exhaust portion 3302.As shown in fig. 7~fig. 9, the second canister portion 330 is in circle The peripheral surface of cylinder has four medial planes 336 with shape made of the plane cut-out parallel with central shaft J1.Medial plane 336 are arranged at equal intervals in the circumferential.Medial plane 336 is the plane parallel with central shaft J1.

In second aerofoil fan 3, the second impeller 31 is rotated in the inside of the second canister portion 330 around central shaft J1, generates air-flow. It is, the second canister portion 330 is a part for exterior body, and it is also wind-tunnel.That is, second housing 33 includes to surround the second impeller Second canister portion 330 of 31 radial outside.In addition, the second impeller 31 is rotated around central shaft J1.

Second air inlet flange portion 3311 is provided to the upper end 331 of second housing 33.Second air inlet flange portion 3311 is in The mandrel side J1 has a rectangular shape when looking up, the interior path length of the length on one side than the second canister portion 330.Second air inlet flange portion Corner part when the 3311 slave central shaft side J1 looks up is extended from the periphery of the second canister portion 330 towards radial outside.In addition, When the central shaft side J1 looks up, face and the medial plane 336 on the side in the second air inlet flange portion 3311 of square shape are constituted It flushes.

Second exhaust flange part 3321 is provided to the lower end 332 of second housing 33.Second exhaust flange part 3321 is in The mandrel side J1 has a rectangular shape when looking up, the interior path length of the length on one side than the second canister portion 330.Second exhaust flange part 3321 corner part when the central shaft side J1 looks up is extended from the periphery of the second canister portion 330 towards radial outside.In addition, When the central shaft side J1 looks up, face and the medial plane 336 on the side of the second exhaust flange part 3321 of square shape are constituted It flushes.Moreover, when the central shaft side J1 looks up, the second air inlet flange portion 3311 and second exhaust flange part 3321 are overlapped.

Second canister portion 330 has the first inside diameter 333 and the second inside diameter 334.First inside diameter 333 is configured in second The exhaust side in diameter portion 334, i.e. downside OS.First inside diameter 333 is cylindrical in shape, and internal diameter D21 does not change in the axial direction.Second The minimum diameter in portion 330 is internal diameter D21.That is, the first inside diameter 333 is minimum diameter part.Second inside diameter 334 is at second 331 side of upper end, the i.e. end of air inlet side are configured in portion 330.Second inside diameter 334 radially with medial plane 336 The part of overlapping is inner side plane 3341, is inner curve 3342 by the part that inner side plane 3341 connects in the circumferential each other. Inner curve 3342 has conus portion 335.Conus portion 335 is a part for the inner surface of cone, is expanded to upside, that is, air inlet side Diameter.

The top side of the inner curve 3342 of second inside diameter 334 is in circle with the section cut off with the face of orthogonality of center shaft Arcuation, and be internal diameter D22.Moreover, in inner curves 3342 of the internal diameter D21 of the first inside diameter 333 than the second inside diameter 334 Diameter D22 is small.

In addition, when connecting the first aerofoil fan 2 and the second aerofoil fan 3, the second inside diameter 234 of the first canister portion 230 It is continuously connected in the axial direction with the second inside diameter 334 of the second canister portion 330.At this point, in order to make the first canister portion 230 second in The inner curve 3342 of second inside diameter 334 of the inner curve 2342 in diameter portion 234 and the second canister portion 330 smoothly connects, and makes Internal diameter D12 and internal diameter D22 are equal.In addition, the inner side plane 2341 and of the second inside diameter 234 in order to make the first canister portion 230 The inner side plane 3341 of second inside diameter 334 of two canister portions 330 smoothly connects, and keeps internal diameter D11 and internal diameter D21 equal.

In addition, in the axial lower end 332 of the second canister portion 330, exist in the corner part with second exhaust flange part 3321 The region being radially overlapped has in the region be overlapped in the axial direction with the inner curve 3342 of the second inside diameter 334 in other words The wide diameter portion 337 of lateral radial outside bending under standby axial direction.The internal diameter of wide diameter portion 337 is as wide diameter portion 337 is towards the stream of air-flow It moves direction and becomes larger.By making this shape, the gas being discharged from the second exhaust portion 3302 of the second canister portion 330 can be made Stream is difficult to disorder.When wide diameter portion 337 comprising the face of central shaft J1 to cut off, the shape in section becomes curved surface.That is, wide diameter portion 337 Shape with so-called bell mouth shape.

That is, second housing 33 has pros bigger than the internal diameter of the inner peripheral surface of the second canister portion 330 on one side in exhaust side end The second exhaust flange part 3321 of shape.In 332 end of exhaust side of the inner peripheral surface of the second canister portion 330, radially with second row The ora terminalis for being partially toward exhaust side 332 of the corner part overlapping of gas flange part 3321 is bent to radial outside.As a result, by that will expand The shape gradually extended is made in diameter portion 337, compared with the case where making cone, air-flow can be made to be difficult to disorder, can inhibit to press The reduction of power and air quantity.

Second aerofoil fan 3 has 11 the second ribs 34.11 the second ribs 34 are from the second inside diameter 334 Extend to radially inner side, and configures at equal intervals in the circumferential.After the radially inner side of second ribs 34 and the second motor part 32 The basal part 3221 stated connects.The second motor part 32 is supported in second housing 33 using the second ribs 34 as a result,.Second housing 33, the second ribs 34 and basal part 3221 are the resin molded bodies being integrally formed using resin.In second aerofoil fan 3, Second ribs 34 are configured at 331 side of upper end of second housing 33.That is, inner circumferential of second ribs 34 from the second canister portion 330 Extend towards inside, and supports the second motor part 32.

When the central shaft side J1 looks up, the second ribs 34 are configured at the inside of the second canister portion 330.Second ribs 34 combine with the first ribs 24 of the first aerofoil fan 2, are used as stator blade.Therefore, connect by the second aerofoil fan 3 When being connected to the downside OS of the first aerofoil fan 2, the second ribs 34 are tilted to direction identical with the first ribs 24.That is, the The axial downside of two ribs 34 is located at the rear side of the direction of rotation of the first impeller 21.

Second motor part 32 is so-called outer-rotor type.As shown in Figure 10, the second motor part 32 has the second rotor portions 321 With the second stator department 322.Second motor part 32 makes the second impeller 31 rotate.

Second stator department 322 has basal part 3221, bearing cage 3222, armature 3223 and circuit board 3224. Basal part 3221 is formed with second housing 33 and the second ribs 34 as integrally formed body.Basal part 3221 is in and center Orthogonal disk-shaped of axis J1, and the J1 overlappings of Center-to-Center axis.Bearing cage 3222 is cylindrical, is configured at basal part 3221 Central portion, and extend to axial downside.The body in addition, bearing cage 3222 can also be one of the forming with basal part 3221. In the top of the inside of bearing cage 3222 and lower part installation ball bearing 3225 and ball bearing 3226.Then, pass through ball Bearing 3225 and ball bearing 3226 can pivotally support the aftermentioned axis 3213 of the second rotor portions 321.In addition, ball bearing 3225 and ball bearing 3226 be bearing an example, be not limited to this.Widely used axis 3213 can be supported as can The bearing of the construction of rotation.

Armature 3223 is fixed on the radial outside of bearing cage 3222.Armature 3223 has stator core 3227, coil 3228 and insulator 3229.Stator core 3227 is the laminated body for being laminated electromagnetic steel plate in the axial direction.In addition, stator Iron core 3227 is not limited to laminated body made of laminated electromagnetic steel plate, such as can also be that the sintered body of powder, cast body etc. are single One component.

Stator core 3227 has the cricoid core back of the body and multiple (here, nine) teeth.Nine teeth from the periphery that core is carried on the back towards Radial outside extends and is formed as radial.Nine teeth circumferentially configure as a result,.Coil 3228 is by being equipped with insulator Surrounding's coiled electrical conductor of 3229 each tooth and constitute.

Enter bearing cage 3222 in the core back pressure of stator core 3227, in 3222 fixed stator iron core of bearing cage 3227.Indentation can also be so-called tight fit, can also be the light indentation weaker than tight fit of the power of indentation, so-called transition matches It closes.The core back of the body can also be other methods such as Nian Jie with the fixation of bearing cage 3222.Stator core 3227 is being fixed on bearing When maintaining part 3222, the J1 overlappings of Center-to-Center axis.Moreover, in order to keep the second motor part 32 smooth and efficiently rotate, in week Nine teeth of upward arranged at equal intervals stator core 3227.

Circuit board 3224 is installed in basal part 3221.3228 electricity of coil of circuit board 3224 and the second stator department 322 Connection.Circuit board 3224 includes the driving circuit of driving coil 3228.

The basal part 3221 of second stator department 322 and the second ribs 34 are one of the forming body.Second stator department as a result, 322 i.e. the second motor parts 32 are supported in the second ribs 34.In addition, the second ribs 34 are also one of the forming with second housing 33 Body.Therefore, the second motor part 32 is connect via the second ribs 34 with second housing 33, in other words, is supported in second housing 33。

Second rotor portions 321 have yoke 3211, magnetic field magnet 3212, axis 3213 and axis fixing component 3214.Magnetic Yoke 3211 is made of metal, and has lid cylindric in centered on central shaft J1.Center in the lid portion of yoke 3211 is fixed There is axis fixing component 3214.Axis 3213 is fixed on axis fixing component 3214 by fixing means such as indentations.In addition, fixing means is not It is defined in indentation, can also be other methods such as bonding.That is, yoke 3211 is fixed via axis fixing component 3214 and axis 3213.

Magnetic field 3212 cylindrical shape of magnet.Magnetic field magnet 3212 is fixed on the inner surface of yoke 3211.It uses in magnetic field The poles N and the poles S of magnet 3212 alternating magnetization in the circumferential.In addition it is also possible to instead of the magnetic field magnet 3212 of cylindrical shape, Be arranged multiple magnetic field magnet in circumferential direction.

Axis 3213 is made of metal, and cylindrical.Axis 3213 is supported via ball bearing 3225 and ball bearing 3226 It can be rotated relative to i.e. the second stator department 322 of bearing cage 3222.Bearing cage 3222 can be rotatably supported at The Center-to-Center axis J1 overlappings of axis 3213.

In second motor part 32, axis 3213 is supported for rotate via ball bearing 3225 and ball bearing 3226, from And the second rotor portions 321 can be rotatably supported at the second stator department 322 around central shaft J1.At this point, the magnetic of the second rotor portions 321 Field is separated opposed with gap radially with the radially-outer surface of the inner radial surface of magnet 3212 and stator core 3227.For The details of the action of second motor part 32, followed by narration.

As shown in Fig. 9 and Figure 10, the second impeller 31 has multiple second blades 311 and cup shell 312.Cup shell 312 Cylindrical shape is covered in having.In addition, cup shell 312 has been made, lid is cylindric, however, not limited to this, can also the outer diameter of peripheral surface exist Difference, for example, circular cone shape in axial direction.

Second impeller 311 is protruded from the radially-outer surface of cup shell 312 to radial outside.In second impeller 31, the second leaf Wheel 311 has seven.Seven the second impellers 311 arranged at equal intervals in the circumferential.Prolong that is, the second impeller 31 has to radial outside Multiple second impellers 311 stretched and arranged in the circumferential.Second impeller 311 tilts in the circumferential, is revolved by the second impeller 31 Turn, to generate from upside IS to the air-flow of downside OS.In other words, the second impeller 311 to make air-flow from upside IS to downside The direction that OS is generated tilts.

As above-mentioned, the second stator department 322 of the second motor part 32 passes through in the basal part being integrally formed with second housing 33 3221 install bearing cages 3222, armature 3223 and circuit board 3224 and assemble.That is, the second stator department 322 is via Two ribs 34 are supported in second housing 33.

Then, the yoke 3211 of the second rotor portions 321 is fixed in the inside of the cup shell 312 of the second impeller 31.Yoke 3211 fixation to cup shell 312 can also be carried out by being pressed into, and can also be bonding.Alternatively, it is also possible to tight using screw etc. Gu component carries out.Cup shell 312 is fixed on yoke 3211 in a manner of inhibiting the deviation with yoke 3211.That is, the second impeller 31 It is fixed on the second rotor portions 321.

Then, the axis 3213 for the second rotor portions 321 for being fixed with the second impeller 31 is fixed on and is installed on bearing cage The ball bearing 3225 of 3222 inside and the inner ring of ball bearing 3226.In addition, axis 3213 is to ball bearing 3225 and ball bearing The fixation of 3226 inner ring is carried out by being pressed into, and but not limited thereto.Such as it widely used can be bonded, weld etc. and can inhibit The opposite movement of axis 3213 and lubrication groove and the fixing means that axis 3213 can be made to be rotated around central shaft J1.As above, it installs There are the second rotor portions 321 of the second impeller 31 that can be rotatably mounted to the second stator department 322.

By the way that the second rotor portions 321 are installed on the second stator department 322, to which the second impeller 31 is accommodated in second housing 33 Inside.Moreover, the radial outside of the second blade 311 is opposed with the inner surface of the second canister portion 330 radially.In addition, second Blade 311 is accommodated in the inside of the axial length of the second canister portion 330.In addition, the inner surface and the second blade of the second canister portion 330 The radial gap uniformity of 311 radial outside.In addition, the radial outside of the inner surface of the second canister portion 330 and the second blade 311 Gap uniformity include not only accurately uniform situation, also include the degree for the action for not influencing the second aerofoil fan 3 not Uniform situation.

From the driving circuit for being installed on circuit board 3224 electric current is in time supplied to the coil 3228 of the second motor part 32. The second rotor portions 321 of the second motor part 32 are rotated with scheduled direction as a result,.In addition, here, from the IS of upside central shaft When J1, the direction of rotation of the second rotor portions 321 is counterclockwise.

It is rotated around central shaft J1 by the second motor part 32, to be fixed on the second impeller 31 of the second rotor portions 321 It is rotated around central shaft J1.By the rotation of the second impeller 31, in second housing 33, in other words, is produced from the inside of the second canister portion 330 The raw air-flow that convolution and axis flow up in the circumferential.

Compared with the first blade 211 of the first aerofoil fan 2, the second blade 311 of the second aerofoil fan 3 is relative to axis Gradient is smaller, and the pressure difference of pressure face and suction surface is smaller.Therefore, though the radial outer edge of the second blade 311 not Auxiliary blade portion is set, the pressure loss can be also inhibited.In addition, this leaf with the blade smaller relative to the gradient of axis In wheel, compared with by the effect of rotary compression air, it is easy to get the effect for improving flow velocity.That is, with 2 phase of the first aerofoil fan Than the ability of the increase delivery flow of the second aerofoil fan 3 is higher.In other words, compared with the second aerofoil fan 3, first axle The ability of the increase discharge pressure of flow fan 2 is higher.In-line arrangement aerofoil fan 1 is by by the aerofoil fan of these different abilities It connects in-linely, to improve pressure and flow.Hereinafter, illustrating the details of in-line arrangement aerofoil fan 1.

By the first aerofoil fan 2 and the second aerofoil fan 3 it is in the axial direction in-line connect, form in-line arrangement aerofoil fan 1. The lower end of first aerofoil fan 2 is connected with the upper end of the second aerofoil fan 3.The first exhaust flange of first aerofoil fan 2 Portion 2321 and the second air inlet flange portion 3311 of the second aerofoil fan 3 contact and fix in the axial direction.First exhaust flange part 2321 can enumerate with the fixation in the second air inlet flange portion 3311 and be screwed, and but not limited thereto.For example, bonding can be enumerated Deng.The first exhaust portion 2302 of first aerofoil fan 2 is seamlessly connect with the second intake section 3301 of the second aerofoil fan 3. Inhibit as a result, from the air that the first exhaust portion 2302 of the first aerofoil fan 2 is discharged from the first aerofoil fan 2 and the second axis stream wind The interconnecting piece of fan 3 is leaked out to outside.

It is configured with the first ribs 24 in the exhaust side of the first aerofoil fan 2.In addition, in the air inlet of the second aerofoil fan 3 Side is configured with the second ribs 34.Moreover, by connecting the first aerofoil fan 2 and the second aerofoil fan 3 in the axial direction, to The face towards air inlet side towards the face of exhaust side and the second ribs 34 of first ribs 24 is overlapped in the axial direction.In addition, The face towards air inlet side towards the face of exhaust side and the second ribs 34 of first ribs 24 can also contact, and can also be formed The gap of the degree of sinuous flow is not will produce.That is, the first ribs 24 are configured at the exhaust side of the first shell 23, the second ribs 34 Be configured at the air inlet side of second housing 33, the first ribs 24 towards the face of exhaust side and the second ribs 34 towards air inlet The face of side is overlapped in the axial direction.With this configuration, it is quiet to be composed the first ribs 24 and the second ribs 34 Blade.Thereby, it is possible to the velocity component of the direction of rotation of air-flow towards axially, is increased axial pressure and flow.

When first aerofoil fan 2 and the second aerofoil fan 3 are connected, the inside of the second inside diameter 234 of the first canister portion 230 The inner side plane 3341 of second inside diameter 334 of plane 2341 and the second canister portion 330 is configured on same plane.In addition, first The inner curve of the inner curve 2342 of second inside diameter 234 of canister portion 230 and the second inside diameter 334 of the second canister portion 330 3342 are configured on same cylindrical surface.It connects in this way, the second inside diameter 234 and second of the first canister portion 230 can be made Second inside diameter 334 of canister portion 330 smoothly connects in the axial direction.

That is, the internal diameter that the first shell 23 has the inner surface than the first canister portion 230 on one side in the end of exhaust side is big just The first exhaust flange part 2321 of square shape.In addition, second housing 33 has on one side in the end of air inlet side than the second canister portion 330 Inner surface the big square shape of internal diameter the second air inlet flange portion 3311.First exhaust flange part 2321 and the second air inlet are convex Edge 3311 overlappingly connects in the axial direction, in the exhaust side end of the inner surface of the first canister portion 230 and first exhaust flange part The air inlet side end of the internal diameter D12 for the part that 2321 corner part is overlapped radially and inner surface in the second canister portion 330 With the corner part in the second air inlet flange portion 3311 radially be overlapped part internal diameter D22 than each canister portion 230,330 axial direction Minimum diameter D11, D21 it is big.Once the seam of the first shell of extension 23 and second housing 33, in the air-flow of canister portion flowing Flow velocity reduce.Thereby, it is possible to reduce wind noise of the air-flow by the first ribs 24 and the second ribs 34 when.As a result, Can inhibit noise and (or) vibration.That is, can be by 1 mute of in-line arrangement aerofoil fan.

In-line arrangement aerofoil fan 1 drives the first aerofoil fan 2 and the second aerofoil fan 3 simultaneously.In-line arrangement axis stream wind as a result, 1 rotation by the first impeller 21 is fanned, air is sucked from the first intake section 2301.Then, the first impeller 21 by air compress with And accelerate, and be discharged from first exhaust portion 2302.The air being discharged from the first exhaust portion 2302 of the first aerofoil fan 2 is suppressed To external leakage, and flow into from the second intake section 3301 inside of second aerofoil fan 3.Second aerofoil fan 3 passes through second The rotation of impeller 31 by further compression and the acceleration of the air of inflow, and is discharged from second exhaust portion 3302.That is, in-line arrangement Aerofoil fan 1 sucks air from the first intake section 2301 of the end of the upside IS of the first aerofoil fan 2, utilizes the first impeller 21 and second impeller 31 compressed and accelerated, and the second exhaust portion of the end from the downside of the second aerofoil fan 3 3302 discharges.Second inside diameter 234 of the first canister portion 230 and the second inside diameter 334 of the second canister portion 330 are in the axial direction smoothly Connection, it is less to the disorder of air-flow, the reduction of air quantity and pressure can be inhibited.

The internal diameter of the wind-tunnel for the in-line arrangement aerofoil fan 1 that first canister portion 230 and the connection of the second canister portion 330 are formed exists The coupling part of first aerofoil fan 2 and the second aerofoil fan 3, i.e., axial center portion become larger.As a result, from the first aerofoil fan The flow velocity for the air-flow that 2 first exhaust portion 2302 is discharged is slack-off.Thereby, it is possible to reduce by being configured under the first canister portion 230 First ribs 24 of end and be configured at second housing 33 suction side the second ribs 34 when wind noise.

By by the first ribs 24 towards the face of exhaust side and the face towards air inlet side of the second ribs 34 in axis It overlaps upwards, to constitute stator blade by the first ribs 24 and the second ribs 34.First ribs 24 and second Ribs 34 have the inclined surface in the direction of rotation downstream side for making axial downside OS towards the first impeller 21.Pass through the first impeller 21 rotation and the air-flow that generates have a velocity component to circle round on the direction of rotation of the first impeller 21, and with axial Velocity component.Moreover, the stator blade formed by the first ribs 24 and the second ribs 34 by the circumferential speed of air-flow at Divide and turns to axially.Thereby, it is possible to improve axial pressure and flow velocity.In addition, by being supported in the first ribs 24 and second Have gap between rib 34, so as to inhibit the vibration of armature 2223 and armature 3223 directly to transmit mutually, can inhibit Because of caused by the interference of vibration larger vibration and (or) noise.That is, can be by 1 mute of in-line arrangement aerofoil fan.

First aerofoil fan 2 has auxiliary blade portion 213 in the radial outer rim of the first blade 211 of the first impeller 21, Improve the pressure for the air-flow being discharged from first exhaust portion 2302.From the higher air-flow of 2 discharge pressure of the first aerofoil fan.Then, The second axis is flowed into from the higher air-flow of pressure that the first exhaust portion 2302 of the first aerofoil fan 2 is discharged from the second intake section 3301 Flow fan 3.

On the other hand, the number of the blade of the second aerofoil fan 3 is more than the number of the first blade 211 of the first impeller 21, And second aerofoil fan 3 blade it is smaller than the gradient of the first blade 211 relative to the gradient of axis.Therefore, the second axis stream wind The effect of the flow of the raising air-flow of fan 3 is bigger than the first aerofoil fan 2.In second aerofoil fan 3, first axle flow fan will be come from The air-flow of 2 higher pressure accelerates, and flow is made to increase.High pressure and big flow can be discharged in in-line arrangement aerofoil fan 1 as a result, Air-flow.

According to the above, the first aerofoil fan 2 has auxiliary in the radial outer edge of the first blade 211 of the first impeller 21 Blade part 213, to carry out the rising of the pressure of the air-flow generated by the first impeller 21.The raising pressure of first aerofoil fan 2 Effect it is preferable.The effect for improving the i.e. raising flow of flow velocity of second aerofoil fan 3 is preferable.

Using the simulation of computer, the characteristic of the in-line arrangement aerofoil fan 1 of the disclosure is evaluated.In-line arrangement axis stream wind In fan 1, the number of the blade of the impeller of the aerofoil fan of air inlet side is set as Nin, by the impeller of the aerofoil fan of exhaust side The number of blade is set as Nout, and the number of the first ribs and the second ribs is set as Nrib, change Nin, Nout and Nrib is simulated.Furthermore, it is assumed that the structure of the disclosure is formed in the radial outer edge of the blade of the impeller of aerofoil fan The auxiliary blade portion of outer lateral air inlet side bending.

As conventional example, best efficiency point when measuring Nin=5, Nout=7, Nrib=11 and not having auxiliary blade With discharge pressure and flow.In addition, as embodiment, the diameter of the blade with Nin=5, Nout=7, N=11 and in air inlet side To outer edge be equipped with the structure in auxiliary blade portion and carry out identical with conventional example measurement.

As a result, the best efficiency point of conventional example is 46%, in contrast, the peak efficiency of embodiment rises to 47%. In addition, just the flow of the air-flow of discharge is 4.0m³For pressure when/min, conventional example is about 1230Pa, in contrast, is implemented Example is about 1250Pa.For input shaft power at this time, conventional example 168W, in contrast, embodiment 165W.

As a result, relative to conventional example, the best efficiency point of embodiment rises, and the pressure under same flow rises.Separately Outside, relative to conventional example, although embodiment pressure-flow characteristic rises, input shaft power reduces.

The result of simulation passes through the blade and exhaust side in air inlet side it is found that under the structure of Nin ＜ Nout ＜ Nrib At least one party of blade auxiliary blade portion is set, compared to not having the case where auxiliary blade, become high efficiency, high pressure and Wind Volume.

In addition, Nin, Nout and Nrib are the group of the mutually integer of prime number each other.In other words, Nin, Nout and Nrib It is the group for the integer for not having the common divisor other than 1.With this configuration, the first impeller 21, the second impeller can be inhibited 31, the resonance of 34 respective vibration of the first ribs 24 and the second ribs.That is, the noise caused by resonance can be inhibited, By 1 mute of in-line arrangement aerofoil fan.

In addition, under the structure of Nin ＜ Nout ＜ Nrib, in the blade setting auxiliary blade portion of suction side, change Nin, Nout, Nrib carry out same simulation.Embodiment is set as when by (Nin, Nout, Nrib)=(5,7,11), will (Nin, Nout, Nrib)=(4,7,11) are set as comparative example 1, and (Nin, Nout, Nrib)=(5,9,11) are set as comparative example 2, will (Nin, Nout, Nrib)=(5,11,11) be set as comparative example 3, (Nin, Nout, Nrib)=(5,7,13) are set as comparative example 4.

Then, just the flow of the air of discharge is 4.0m³For pressure when/min, comparative example 1 is about 800kPa, is compared Example 2 is about 990kPa, and comparative example 3 is about 1150kPa, and comparative example 4 is about 990kPa.

The number Nin of the blade of the impeller of the aerofoil fan of air inlet side is in embodiment 5, is 4 in comparative example 1 It is a.It is found that according to the difference of the number Nin of the blade of the impeller of the aerofoil fan of air inlet side, the pressure of the air of discharge generates Difference.

In addition, the number Nout of the blade of the impeller of the aerofoil fan of exhaust side is in embodiment 7, in comparative example 2 In be 9, in comparative example 3 be 11.It is found that not according to the number Nout of the blade of the impeller of the aerofoil fan of exhaust side Together, the pressure of the air of discharge generates poor.Compared to Nout=9, the pressure higher of the air of the side discharge of Nout=11.And And, it is known that when Nout=7, further get higher.

Further, the number Nrib of the first ribs and the second ribs is in embodiment 1 11, in comparative example It is 13 in 4.It is found that according to the difference of the number Nrib of the first ribs and the second ribs, the pressure of the air of discharge It is poor to generate.When compared to Nrib=13, the pressure higher for the air that when Nrib=11 is discharged.

That is, it is found that compared to comparative example 1~compare 4, the characteristic higher of the pressure-flow of the air-flow of the discharge of embodiment.

Moreover, further largely simulated as a result, confirm, in Nin=5 and make and have auxiliary blade portion When blade, the high-pressure trend of air-flow is best.In addition, confirm, by being set as Nout=7, to make the gradient of blade increase, energy Enough maintain blade area, strong wind quantization best.Further confirm that, by being set as Nrib=11, can best efficiency point both The required mechanical strength for guaranteeing steadily to support the first motor part and the second motor part, get back maximum pressure and Maximum wind power.

In the disclosure, the first impeller 21 and the second impeller 31 are along equidirectional rotation.Therefore, by will be from first axle stream wind The direction of rotation of the circumferential velocity component and the second impeller 31 of the air-flow of 2 discharge of fan is set as identical direction, to because of gas The relative velocity of the speed of the direction of rotation of stream and the direction of rotation of the end of the upstream side of the second blade 311 of the second impeller 31 Become smaller, so vibration and noise can be inhibited.That is, can be by 1 mute of in-line arrangement aerofoil fan.In addition, above-mentioned direction with The flow direction for the air-flow that second blade 311 flows into is identical direction, therefore, it is possible to inhibit the resistance of the second blade 311.By This, can inhibit input shaft power.

In addition it is also possible to the inclined direction of the second blade 311 of the second impeller 31 is set as opposite opposite, and by second The direction of rotation of impeller 31 is set as the direction opposite with the direction of rotation of the first impeller 21.The of the second impeller 31 is improved as a result, The velocity component of the direction of rotation of air-flow is turned to axial effect by two blades 311.Thereby, it is possible to improve from in-line arrangement axis stream wind The pressure of the air-flow of 1 discharge of fan.

In addition, in present embodiment, has the first blade 211 in the first aerofoil fan 2, first blade 211 is in radial direction Outer edge have auxiliary blade portion 213, but not limited thereto.It can also be in the second blade 311 that the second aerofoil fan 3 has Radial outer edge have auxiliary blade portion.Alternatively, it is also possible in the outer of the radial direction of the first blade and the second blade both sides Edge has auxiliary blade portion.That is, at least one party of the first blade 211 or the second blade 311 has auxiliary blade portion 213.

As the important performance of aerofoil fan, pressure and air quantity can be enumerated.Single flow axis stream according to the present invention Fan 1 can be most by the way that two 21,31 points of impellers are used (the second impeller 31) for pressure with (the first impeller 21) and air quantity Higher pressure and air quantity are ensured when high efficiency as a whole.It is, by adding auxiliary lobe in impeller (the first impeller 21) Piece (auxiliary blade portion 213), can be obtained higher pressure, can be used as pressure and utilizes impeller.Pressure is with impeller (the first impeller 21) Pressure face and suction surface pressure difference it is larger.Therefore, from the peripheral part of impeller (the first blade 211) and shell inner peripheral surface (the The inner peripheral surface of one canister portion 230) clearance leakage air, the pressure loss becomes larger.Pass through the peripheral part in impeller (the first impeller 21) Auxiliary blade (auxiliary blade portion 213) is set, the pressure loss can be reduced.On the other hand, by not in impeller (the second impeller 31) auxiliary blade is set, the larger air quantity impeller of air quantity is can be used as.Air quantity is with impeller (the second impeller 31) by with entire Face pushes air, to which larger air quantity can be obtained.According to the above, passing through combination pressure impeller (the first impeller 21) and air quantity With impeller (the second impeller 31), the air-flow of higher pressure and larger air quantity can be obtained.

Embodiment of the present disclosure is this concludes the description of, as long as in the range of the objective of the disclosure, embodiment can Carry out various modifications.

The in-line arrangement aerofoil fan of the disclosure for example can be used as to being configured at computer, network communication device, server Etc. electronic unit air-supply in equipment, the cooling fan of cooling electronic unit.

Claims

1. a kind of in-line arrangement aerofoil fan, has：

First aerofoil fan blows out the air sucked from air inlet side from exhaust side；And

Second aerofoil fan, along the central shaft of above-mentioned first aerofoil fan be connected to above-mentioned first aerofoil fan and will from into The air of gas side sucking is blown out from exhaust side, end of the above-mentioned in-line arrangement aerofoil fan to the exhaust side of above-mentioned first aerofoil fan It is connected with the end of the air inlet side of above-mentioned second aerofoil fan,

Above-mentioned first aerofoil fan has：

First impeller, around above-mentioned center axis rotation；

First motor part makes above-mentioned first impeller be rotated；

First shell, it includes the first canister portions of the radial outside for surrounding above-mentioned first impeller；And

First ribs extend inwardly from the inner surface of above-mentioned first canister portion, and support above-mentioned first motor part,

Above-mentioned first impeller has multiple first blades for extending to radial outside and circumferentially arranging,

Above-mentioned second aerofoil fan has：

Second impeller, around above-mentioned center axis rotation；

Second motor part makes above-mentioned second impeller rotate；

Second housing, it includes the second canister portions of the radial outside for surrounding above-mentioned second impeller；And

Second ribs extend inwardly from the inner surface of above-mentioned second canister portion, support above-mentioned second motor part, and with it is upper It is identical to state the first ribs number,

Above-mentioned second impeller has multiple second blades for extending to radial outside and circumferentially arranging,

At least one party of above-mentioned first blade and above-mentioned second blade has auxiliary blade portion

Above-mentioned in-line arrangement aerofoil fan is characterized in that,

The number of above-mentioned first blade is being set as Nin, the number of above-mentioned second blade is being set as to Nout and by above-mentioned first When the number of stake rib and above-mentioned second ribs is set as Nrib, meet Nin ＜ Nout ＜ Nrib.

2. in-line arrangement aerofoil fan according to claim 1, which is characterized in that

Above-mentioned auxiliary blade portion is provided to the radial outer edge of above-mentioned first blade.

3. in-line arrangement aerofoil fan according to claim 2, which is characterized in that

The radial outside in above-mentioned auxiliary blade portion is to air inlet lateral bend.

4. in-line arrangement aerofoil fan described in any one of claim 1 to 3, which is characterized in that

Nin, Nout and Nrib are the groups for the positive integer for not having the common divisor other than 1.

5. in-line arrangement aerofoil fan according to any one of claims 1 to 4, which is characterized in that

Nin is 5.

6. in-line arrangement aerofoil fan according to any one of claims 1 to 5, which is characterized in that

Nout is 7.

7. according to in-line arrangement aerofoil fan according to any one of claims 1 to 6, which is characterized in that

Above-mentioned first ribs are configured at the exhaust side of above-mentioned first shell,

Above-mentioned second ribs are configured at the air inlet side of above-mentioned second housing,

The face towards air inlet side towards the face of exhaust side and above-mentioned second ribs of above-mentioned first ribs weighs in the axial direction It is folded.

8. in-line arrangement aerofoil fan according to any one of claims 1 to 7, which is characterized in that

Nrib is 11.