CN208686645U - Electric blower - Google Patents

Abstract

The utility model provides a kind of electric blower.This electric blower includes: motor, has threaded portion in one end of rotary shaft；Fastening nut tightens together with threaded portion；And centrifugal fan, rotary shaft is held in by the fastening of threaded portion and fastening nut.Centrifugal fan has inducer, and in the center there is through-holes for inducer.The through-hole stage portion bigger than the internal diameter of motor side in the internal diameter that midway is equipped with opposite-motor-side.The outer diameter of fastening nut is smaller than the internal diameter of the through-hole of the opposite-motor-side of inducer, and bigger than the internal diameter of the through-hole of motor side.Also, by make fastening nut along axial direction to the stage portion pressurization in a manner of fastening thread portion and fastening nut.Using the utility model, the raising taken into account by the way that the blower efficiency that inducer is realized is arranged and the electric blower inhibited to the vibration of motor can be obtained.

Description

Electric blower

Technical field

The utility model relates to a kind of power using motor to make centrifugal fan rotation to the electric blower of air-supply.

Background technique

Use can obtain higher suction pressure in the fan of electric blower for being equipped on electric dust collector etc. Centrifugal fan.In addition, proposing the technology that motor is installed on to centrifugal fan in the past.One as this previous technology Example exists in the periphery of centrifugal fan equipped with the air guiding portion for forming ventilation path and covers centrifugal fan using blower-casting With the structure of air guiding portion.The electric blower has the fastening nut for fixing centrifugal fan, and in motor The top end part of rotary shaft is equipped with threaded portion.Fastening nut is tightened in the threaded portion and centrifugal fan is fixed on rotary shaft.From Heart fan is rotated at high speed using motor, to generate air quantity and pressure.In order to obtain higher suction pressure, in centrifugation wind The suction side center of fan has inducer, which has the wing of 3D shape.It is to improve the wind pushing performance of centrifugal fan Purpose has carried out various designs (referring for example to Japanese Unexamined Patent Publication 2000-34993 bulletin, day to the shape of fastening nut This special open 2014-34934 bulletin).

For example, in order to fix centrifugal fan, proposing knot as follows in Japanese Unexamined Patent Publication 2000-34993 bulletin Structure, that is, the suction inlet than the front end portion as front surface cover aperture position to opposite-motor-side position outstanding, will Fastening nut is tightened in the threaded portion of the top end part of rotary shaft.

In addition, in order to fix centrifugal fan, proposing knot as follows in Japanese Unexamined Patent Publication 2014-34934 bulletin Structure, that is, threaded portion, the fastening spiral shell that will be made of the curved surface from head towards motor section side are set in the rotary shaft end of fan portion Mother is anchored on the threaded portion.

Utility model content

The electric blower of the utility model includes: motor, is formed with threaded portion in one end of rotary shaft；Fasten spiral shell Mother tightens together with threaded portion；And centrifugal fan, rotation is held in by the fastening of threaded portion and fastening nut Axis.In addition, centrifugal fan has inducer and front surface cover and rear surface cover for clamping inducer.In addition, inducer exists Its center has through-hole.The through-hole stage portion bigger than the internal diameter of motor side in the internal diameter that midway is equipped with opposite-motor-side. The outer diameter of fastening nut is smaller than the internal diameter of the through-hole of the opposite-motor-side of inducer, and the internal diameter of the through-hole than motor side Greatly.Also, by make fastening nut along rotary shaft it is axial by stage portion to the pressurization of rear surface cover in a manner of fastening thread portion and Fastening nut.

Further, the stage portion is metal cylinder.

Further, by resin forming, the stage portion is and the inducer integrally formed metal the inducer The cylinder of system.

Further, the entirety of the fastening nut is accommodated in the inside of the through-hole.

Further, slot or the hole of screw threads for fastening are equipped in at least one end of the fastening nut.

Further, the fastening nut is aluminum or aluminum alloy.

Using the structure, fastening nut is capable of forming to be not prominent to the opposite-motor-side of inducer and is buried in wind-guiding Such container structure in the through-hole of wheel.Therefore, the center of gravity of fastening nut, the center of gravity of centrifugal fan can be made than further to lean in the past The center of gravity of nearly rotary body.Also, thus, it is possible to inhibit as fastening nut, centrifugal fan bias caused by imbalance with further Increased mode is acted on.Thus, it is possible to obtain the raising taken into account by the way that the blower efficiency that inducer is realized is arranged And to the electric blower that the vibration of motor is inhibited.

Detailed description of the invention

Fig. 1 is the half sectional view of the electric blower in the embodiments of the present invention.

Fig. 2 is the exploded view of the electric blower in the embodiments of the present invention.

Fig. 3 is the structure chart of the centrifugal fan of the electric blower in the embodiments of the present invention.

Fig. 4 is the centrifugal fan for indicating the electric blower in the embodiments of the present invention and the interconnecting piece of rotary shaft The structure chart of the details divided.

Fig. 5 be the rotary shaft for indicating the electric blower in the embodiments of the present invention threaded portion and for The outside drawing of one example of the fastening nut of threaded portion combination.

Fig. 6 is to indicate the center of gravity G0 of the rotary body slave electric blower in the embodiments of the present invention to centrifugation The figure of the size L2 of the size L1 of the center of gravity G1 of fan and the center of gravity G2 from the center of gravity G0 of rotary body to fastening nut.

Specific embodiment

Electric blower in the embodiments of the present invention uses aftermentioned structure, inhibits the weight with centrifugal fan The center of gravity of the heart and rotary body separates, as fastening nut, centrifugal fan bias caused by imbalance made in a manner of increased With thus, it is possible to inhibit the vibration of motor.

That is, seeking in electric blower in order to respond the requirement to the low noise of household electrical appliances in recent years Vibration is inhibited.In this regard, in the structure of previous electric blower as described above, such should change there are following Kind aspect.

In general, using the attention to assembling operation and preventing the deformation of centrifugal fan as mesh in electric blower , it is equipped with minim gap, between rotary shaft and the internal diameter of centrifugal fan to be easy the combination of rotary shaft and centrifugal fan It carries out.Therefore, radially (centripetal direction) deviates between the axle center of rotary shaft and the center of centrifugal fan.

As a result, the bias that the axle center that the center of gravity spin shaft of the rotary body containing centrifugal fan occurs is radially offset from, from And the Mass Distribution for occurring to be referred to as unbalanced rotary body becomes inconsistent unbalanced.In addition, because of the screw thread of rotary shaft, tight Gu the bias etc. of the screw thread of nut also results in occurs above-mentioned such radial deviation i.e. bias after tightening, occur uneven Weighing apparatus.Also, because in the amount of unbalance as the product representation of the weight of centrifugal fan and eccentricity cause to generate when rotated from Mental and physical efforts, the centrifugal force become a reason for causing vibration.

In addition, the center of gravity of centrifugal fan and the center of gravity of rotary body are got in the axial direction (thrust direction) that rotary shaft extends Remoter, above-mentioned amount of unbalance is acted on more in the way to enlarge.That is, when rotated, centrifugal fan based on above-mentioned bias, It is moved in a manner of being shaken while the small Circular test on one side the eccentric axial for drawing rotary shaft.Then, with rotary body with The center of gravity of centrifugal fan is axially spaced, is acted in a manner of amplifying the movement, and centrifugal fan is easy to become shaking the head like that Arena mallet movement.That is, due on top there is the rotary shaft of centrifugal fan to draw conical bottom surface with centrifugal fan The mode of Circular test draw and rotated conically, therefore as the center of gravity of centrifugal fan is along the axial center of gravity with rotary body It separates, the diameter for the Circular test which draws when rotated also increases.In particular, the ball bearing at using two supports In the case where the double base construction of rotary shaft, moved although being not susceptible to above-mentioned such mallet of beating, due in ball bearing There is the gap as clearance between circle, outer ring and ball, even therefore double base construct, also can not fully inhibit it is above-mentioned that The arena mallet of sample moves.

For example, the fastening nut in the previous structure also will affect the center of gravity in the axial direction of centrifugal fan, containing should The center of gravity of the centrifugal fan of fastening nut can be separated with the center of gravity of rotary body.That is, even if being fastening nut, according to its peace The difference of holding position, it is also possible to largely influence the amount of unbalance caused by bias, increase the vibration of motor.

Then, in the present embodiment, be formed as fastening nut being accommodated in the through-hole of inducer and simply tie like that Structure makes center of gravity of the center of gravity in the axial direction of the centrifugal fan containing fastening nut than the previous structure close to rotary body.By This is capable of providing a kind of maintenance blower efficiency, and inhibit the increasing of amount of unbalance as described above in the present embodiment Add, to seek to reduce the electric blower based on unbalanced vibration as described above.

Hereinafter, being described with reference to the embodiments of the present invention.In addition, in the present embodiment, enumerating electronic suction One example of the electric blower that dirt device has is illustrated.

(embodiment)

Fig. 1 is the half sectional view of the electric blower in present embodiment, and Fig. 2 is the exploded perspective of the electric blower Figure.

As depicted in figs. 1 and 2, electric blower 10 has motor 20, the motor 20 be located at it is one side closed and this The opposite direction of side forms the inside of the cylindric frame 11 of opening.

Motor 20 is commutator motor, is mainly made of excitation division 22 and armature 23.Excitation division 22 contains field core Core and excitation winding, the excitation winding are wound in the salient pole of the field core, which is maintained at the inside of frame 11. In addition, armature 23 is configured to containing armature core 23a, armature winding 23w, commutator 23c and rotary shaft 24.In armature 23 Armature core 23a be wound with armature winding 23w.A part of armature winding 23w from armature core 23a draw and with rectification Sub- 23c connection.In addition, armature core 23a and commutator 23c are formed as cylindric, to run through armature core 23a and commutator The mode at the center of 23c is combined with rotary shaft 24.Also, two end sides of the rotary shaft 24 are respectively to rotate certainly by the bearing of bearing 25 Such as.In Fig. 1, rotary shaft 24 is enumerated by the example of the bearing 25o of open side and the bearing 25c bearing of closed side, above-mentioned opening The bearing 25o of side is disposed on the bearing 25 of the open side of frame 11, and the bearing 25c of above-mentioned closed side is disposed on frame 11 The bearing 25 of closed side.Armature 23 and excitation division 22 are across scheduled gap as a result, and armature 23 is maintained as with rotary shaft It is rotated freely centered on 24.In addition, the commutator 23c of a pair of of the brush being maintained in a pair of of brush holder 27 and armature 23 is supported It connects.

In the motor 20 constituted above, by applying voltage to a pair of of brush, make electric current via commutator 23c It is flowed to armature winding 23w, is acted on the magnetic field generated by excitation division 22 and rotate armature 23.

In addition, electric blower 10 is using the spinning movement of motor 20 in order to be blown, as shown in Fig. 2, from configuration The direction (hereinafter referred to as axial) for thering is that lateral edge rotary shaft 24 of motor 20 to extend also successively include air guiding portion 13, from Heart fan 14 and blower-casting 16.Also, in order to which centrifugal fan 14 is installed on motor 20, also has and be inserted into motor The 1st washer 33 and the 2nd washer 34 between 20 and centrifugal fan 14, and also there is the rotary shaft 24 for being anchored on motor 20 Fastening nut 15.

Firstly, as shown in Figure 1, being equipped with the opening for being configured to closed frame 11 in 20 side of motor of air guiding portion 13 Bracket 31.The peripheral side of the bracket 31 is installed on the periphery of the opening of frame 11.In addition, in the inner circumferential side of bracket 31, it is fixed There is the outer ring of the bearing 25o of open side.Also, the rotary shaft 24 of the inner ring of the bearing 25o of the open side is fixed on as output Axis by the mode that the center of bracket 31 and air guiding portion 13 enters in blower-casting 16 further to be axially protruded.? The top end part of rotary shaft 24 outstanding in this way is equipped with centrifugal fan 14.Illustrate detailed construction below, in the present embodiment, It is equipped with threaded portion 24s on the top of the output shaft of the rotary shaft 24, threaded portion 24s is formed with thread, utilizes the threaded portion 24s and the fixed centrifugal fan 14 of fastening nut 15.In addition, being equipped with inducer 41, the inducer 41 in the center of centrifugal fan 14 The wing with 3D shape.In addition, as shown in Fig. 2, being drawn in the axial direction with clipping air using centrifugal fan 14 and motor 20 The mode for leading portion 13 configures each component.In addition, centered on by rotary shaft 24 radially, in the periphery of centrifugal fan 14 Multiple diffusion wing 13b configured with air guiding portion 13, to form ventilating path.Using multiple diffusion wing 13b to spinning Centrifugal fan 14 be discharged air rectified.Also, drawn in the open side of frame 11 with covering centrifugal fan 14 and air The mode in portion 13 is led configured with blower-casting 16, which has air inlet 16a in central portion.In this way, centrifugal fan 14 are covered by blower-casting 16, and the diffusion wing 13b of air guiding portion 13 is located at the peripheral side of centrifugal fan 14.

Fig. 3 is the structure chart of the centrifugal fan 14 in the embodiments of the present invention.Next, illustrating this referring to Fig. 3 The detailed construction of centrifugal fan 14 in embodiment.

As shown in figure 3, centrifugal fan 14 formed by the inducer 41 of resin, by thin plate rear surface cover 42, front surface Cover 43 and more blades 44 are constituted.Here, in such a way that rear surface cover 42 and front surface cover 43 clamp each blade 44 Front surface cover 43 and rear surface cover 42 are configured spaced apartly.In addition, blade 44 is installed on rear surface cover 42 by riveting processing With front surface cover 43.Also, inducer 41 is located in the mode opposite with the air inlet 43a in center of front surface cover 43 is set to Between rear surface cover 42 and front surface cover 43.Using the structure, using inducer 41 to the charge air flow come in from air inlet 43a It is rectified.

In addition, inducer 41 is made of cylindrical portion 46, hub 47 and alar part 48, pass through the resin forming of synthetic resin It is formed.Cylindrical portion 46 is formed as cylindrical shape in the central portion of inducer 41, and have along axially through through-hole 46t.Hub Portion 47 configures around cylindrical portion 46, is shaped generally as coniform shape.Also, alar part is formed in the hub 47 48.In addition, the alar part 48 is formed to have the shape of three-dimensional curved surface, so as to being flowed from air inlet 43a to 44 side of blade Air is rectified.

In the structure of above such electric blower 10, when the rotary shaft 24 of motor 20 rotates and make shown in Fig. 3 When the centrifugal fan 14 of such structure rotates, air is sucked from the air inlet 43a of the air intake as centrifugal fan 14.It inhales The air entered is pressurizeed and flowed towards the outside diameter of centrifugal fan 14 by inducer 41.Also, pressurize after air then via It configures the diffusion wing 13b in the air guiding portion 13 of the periphery of centrifugal fan 14 and is flowed into 20 side of motor.

Fig. 4 is the centrifugal fan 14 and rotary shaft 24 for indicating the electric blower 10 in the embodiments of the present invention The structure chart of the details of coupling part.Next, explaining the knot for being kept fixed centrifugal fan 14 in detail using Fig. 4 Structure.In addition, in order to avoid trouble, being only applied with hatching to the section of major part in Fig. 4.In addition, being put in great circle AA ' The big major part indicated in circle AA.

As shown in figure 4, being equipped with one end for rotary shaft 24 through such through-hole 46t at the center of inducer 41.That is, logical Hole 46t be can for rotary shaft 24 output shaft it is with being inserted into opposite-motor-side perforative from the motor side in cylindrical portion 46 Hole.In addition, being equipped with stage portion 46s in the midway of through-hole 46t.Here, in the present embodiment, in the electronic of through-hole 46t Pusher side is integrally formed metal cylinder 49 and the inducer 41 of synthetic resin.Also, in the present embodiment, such as Fig. 4 institute Show, a circumferentia of the cylinder 49 is set as stage portion 46s.In addition, using such stage portion 46s with opposite-motor-side The mode internal diameter d1 of through-hole 46t bigger than the internal diameter d2 of the through-hole 46t of motor side constitutes the through-hole 46t in cylindrical portion 46. Also, centrifugal fan 14 in the present embodiment, is fixed on rotary shaft using stage portion 46s and using fastening nut 15 24。

In addition, although cylinder 49 is not required, in the present embodiment in order to prevent creep and be arranged.Namely It says, in the case where being in close contact such structure with rotary shaft 24 using the cylindrical portion 46 as synthetic resin, synthesis tree The fixing intensity fixed to rotary shaft 24 of rouge is easy insufficient.Therefore, in the power of the generation centripetal direction of rotary shaft 24, and Resin portion deforms, and is easy to happen rotary shaft 24 in the deformation position and slides such sliding phenomenon i.e. creep.Then, at this In embodiment, by ensuring intensity using metal cylinder 49, inhibit the generation of creep.In addition, using as synthesis In the case that the cylindrical portion 46 of resin can obtain sufficient intensity, step can also be formed with the synthetic resin for forming inducer 41 Portion 46s.

In addition, the rear surface cover 42 of centrifugal fan 14 is formed by disk-shaped thin plate, have in the center of rear surface cover 42 The rear surface cover through-hole 42a of the size of minim gap is generated between rotary shaft 24.In this way, being configured in radial rotary shaft Minim gap is generated between 24 and the through-hole 46t of 46 inside of cylindrical portion.As a result, in the present embodiment, cylindrical portion 46 can be held It changes places and is installed on rotary shaft 24, improve assembling operation, and also seek to prevent the deformation of centrifugal fan 14.

In addition, becoming such structure: in through-hole 46t, in the axial direction, a circumferentia of metal cylinder 49 and tight Gu nut 15 is in close contact, and rear surface cover 42 is in the inner annular portion 42b and cylinder 49 of the peripheral side of rear surface cover through-hole 42a Another circumferentia be in close contact.

In addition, Fig. 5 is to indicate the threaded portion 24s of the rotary shaft 24 in the embodiments of the present invention and be used for and the spiral shell The outside drawing of one example of the fastening nut 15 of line portion 24s combination.In the present embodiment, logical at 41 center of inducer In the 46t of hole, the threaded portion 24s of the rotary shaft 24 by the way that fastening nut 15 to be anchored on to shape as shown in Figure 5 will be centrifuged wind Fan 14 is fixed on rotary shaft 24.As shown in figure 5, threaded portion 24s of the rotary shaft 24 on output shaft side top is formed with external screw thread 24a.In addition, the appearance of fastening nut 15 is formed as cylindrical shape, and being formed in the opening portion in center can be with threaded portion 24s External screw thread 24a combination internal screw thread 15a.

In addition, the outside diameter d 3 of the fastening nut 15 is smaller than the internal diameter d1 of through-hole 46t, and than the through-hole 46t of motor side Internal diameter d2 it is big.It as a result, in the present embodiment, can be from the through-hole 46t of the opposite-motor-side of inducer 41 by fastening nut 15 are inserted into through-hole 46t.

In addition, at least one end, that is, circumferentia in fastening nut 15 is equipped with the slot or Kong Zuowei of cross, hexagon etc. Screw threads for fastening is used, and can be threadably secured from opposite-motor-side.In Fig. 5, the circumferentia shape in fastening nut 15 is indicated At an example of slot 15b cruciferous.In addition, in the present embodiment, being set as making to have until the formation of fastening nut 15 The circumferentia of slot is all located at the height h3 of fastening nut 15 as inside through-hole 46t.That is, the electric blower of present embodiment 10 be the structure of such nut storage: when fastening nut 15 is anchored on rotary shaft 24 in the through-hole 46t in inducer 41 When the 24s of threaded portion, the entirety of fastening nut 15 is buried in the inside of through-hole 46t.

As described above, electric blower 10 includes rotary shaft 24, centrifugal fan 14 and fastening nut 15, above-mentioned centrifugation wind Fan 14 contains the inducer 41 in center with through-hole 46t.By combining these components in the following manner, centrifugal fan 14 is protected It holds and is fixed on rotary shaft 24.

That is, as shown in figure 4, firstly, the rotary shaft 24 of the inner ring 25oi relative to the bearing 25o for being fixed on open side it is defeated Shaft installs the 1st washer 33 and the 2nd washer 34.Two washers 33,34 ground are clipped axially further from the through-hole of inducer 41 The output shaft of the rotary shaft 24 is inserted into the side lesser internal diameter d2 of 46t.Then, so that the slot 15b of fastening nut 15 becomes insertion The mode of side is inserted into fastening nut 15 from the side biggish internal diameter d1 of through-hole 46t.Then, by the top of plus driver etc. Insertion groove 15b and make fastening nut 15 rotate, so that fastening nut 15 to be anchored on to the threaded portion 24s of rotary shaft 24.As a result, Cylinder 49, the inner annular portion 42b of rear surface cover 42, are clipped along axial direction using the inner ring 25oi and fastening nut 15 of bearing 25o Centrifugal fan 14 is remained secured to rotary shaft 24 by 1 washer 33 and 34 ground of the 2nd washer.In this way, in the present embodiment, passing through By make fastening nut 15 along axial direction to the stage portion 46s pressurization containing cylinder 49 in a manner of fastening nut 15 is fixed on threaded portion 24s, fixed centrifugal fan 14.In addition, the material of fastening nut 15 is set as aluminum or aluminum alloy.

Fig. 6 be indicate the center of gravity G0 of the rotary body slave electric blower 10 in the embodiments of the present invention to from The figure of the size L2 of the size L1 of the center of gravity G1 of heart fan 14 and the center of gravity G2 from the center of gravity G0 of rotary body to fastening nut 15. Here, rotary body is the assembled component pivoted about with the rotary shaft 24 containing armature 23, centrifugal fan 14, because of armature Iron core 23a, armature winding 23w and have ponderable armature 23 immediate vicinity be center of gravity G0.

When being formed as the structure of present embodiment as explained above, compared to utilization nut than centrifugal fan Air inlet position fastened to opposite-motor-side position outstanding as previous structure, inducer can be shortened The length of metal cylinder 49 in 41 through-hole 46t.It therefore, can be with the length of cylinder 49 shortened firstly, first Amount mitigates the weight of cylinder 49.Moreover it is possible to be achieved in the lightweight of the centrifugal fan 14 containing cylinder 49.Therefore, can Inhibit the centrifugal force when rotation proportional to the product of weight and eccentricity, can also inhibit to be based on unbalanced vibration.

Secondly, by keeping the length of the metal cylinder 49 shorter than previous, as the second effect, the weight of cylinder 49 can be made The heart is more close to motor side than in the past.Center of gravity G0 about the centrifugal fan 14 containing cylinder 49 as a result, as shown in fig. 6, It can make the center of gravity G1 of centrifugal fan 14 than shortening the size L1 of the center of gravity G1 from the center of gravity G0 of rotary body to centrifugal fan 14 in the past Close to motor side.

Again, in the present embodiment, compared to utilization nut more outstanding to opposite-motor-side than air inlet position Position fastened as previous structure, the fixed centrifugation wind of fastening nut 15 is utilized in the through-hole 46t of inducer 41 Fan 14.Therefore, as third effect, it can also make the center of gravity of fastening nut 15 more close to motor side than in the past.As a result, such as Fig. 6 It is shown, fastening nut 15 can be made than shortening the size L2 of the center of gravity G2 from the center of gravity G0 of rotary body to fastening nut 15 in the past Center of gravity G2 is closer to motor side, and the center of gravity G1 of the centrifugal fan 14 containing fastening nut 15 is also closer to motor side.

In this way, in the present embodiment, due to the knot for being formed as being accommodated in cylinder 49, fastening nut 15 in through-hole 46t Structure, therefore the center of gravity in the axial direction of the centrifugal fan 14 containing these components can be made close to the center of gravity of rotary body.Therefore, can press down It makes and is acted in a manner of further increasing based on eccentric imbalance, to can also inhibit the vibration as caused by imbalance.

In addition, it's not limited to that for the embodiment, such as the motor side of the internal diameter set on inducer can also be made Metal cylinder be not integrally formed with inducer, and be created as independent part.

Embodiment

The embodiment and comparative example of structure as described above have been made, and has been compared.Here, the structure of comparative example It is that cylinder accounts for the entirety in the through-hole of inducer, and in the opposite-motor-side end rotary shaft end outstanding from through-hole Threaded portion fastened with fastening nut.Comparison result is the weight of the centrifugal fan about electric blower, from comparing The 37.4g of 40.2g to the embodiment of example realizes about 7% lightweight.In addition, about the center of gravity from rotary body to centrifugation wind The axial dimension of the center of gravity of fan in embodiment, can carry out compared with comparative example in a manner of to the close 1.5mm of motor side It is mobile.In the case where having used identical ferrous material, about the weight of fastening nut, since the shape of fastening nut changes Become, volume reduces, therefore the 3.5g from the 4.6g of comparative example to embodiment realizes about 24% lightweight.In addition, implementing In example, by the way that fastening nut is set as aluminium alloy, 1.2g can be reached, realize about 73% lightweight, in addition, about from rotation The size of center of gravity of the center of gravity of swivel to fastening nut in embodiment, can be with close to motor side compared with comparative example The mode of 10.5mm is moved.Thereby, it is possible to inhibit the vibration of about 20% electric blower.

In this way, by that can make the weight lightweight of centrifugal fan, also can be reduced can use centrifugal fan using the utility model Weight and eccentricity product representation as amount of unbalance.Furthermore it is possible to shorten cylinder, and the weight of fastening nut can be made The heart is located proximate to motor side, therefore, can make being located proximate to for the center of gravity of the centrifugal fan containing above-mentioned cylinder, fastening nut Motor side.Therefore, it can also inhibit to be acted in a manner of amplifying above-mentioned amount of unbalance, therefore be able to suppress motor Vibration, can also inhibit the noise etc. generated by the vibration.

Industrial availability

Using the utility model, as the raising that has taken into account by the way that the blower efficiency that inducer is realized is arranged and right The electric blower that the vibration of motor is inhibited, can be applied to various electrical equipments.

Claims (6)

1. a kind of electric blower, the electric blower include:

Motor is formed with threaded portion in one end of rotary shaft；

Fastening nut tightens together with the threaded portion；And

Centrifugal fan has the inducer for being rectified to air-flow and the front surface cover for clamping the inducer With rear surface cover, which is held in the rotary shaft by the fastening of the threaded portion and the fastening nut,

It is characterized in that,

In the center there is through-hole, the through-holes to be equipped with the internal diameter of opposite-motor-side than motor side in midway for the inducer The big stage portion of internal diameter,

The outer diameter of the fastening nut is smaller than the internal diameter of the through-hole of the opposite-motor-side of the inducer, and than motor side The internal diameter of through-hole is big,

By make the fastening nut along the rotary shaft it is axial by the stage portion to rear surface cover pressurization in a manner of Fasten the threaded portion and the fastening nut.

2. electric blower according to claim 1, which is characterized in that

The stage portion is metal cylinder.

3. electric blower according to claim 1, which is characterized in that

The inducer by resin forming,

The stage portion is and the integrally formed metal cylinder of the inducer.

4. electric blower described in any one of claim 1 to 3, which is characterized in that

The entirety of the fastening nut is accommodated in the inside of the through-hole.

5. electric blower described in any one of claim 1 to 3, which is characterized in that

Slot or the hole of screw threads for fastening are equipped in at least one end of the fastening nut.

6. electric blower described in any one of claim 1 to 3, which is characterized in that

The fastening nut is aluminum or aluminum alloy.