CN205154685U - Centrifugation forced draught blower and dust catcher - Google Patents

Abstract

The utility model provides a centrifugation forced draught blower and dust catcher, this centrifugation forced draught blower includes: the motor, with the rotating part of motor rotatory impeller together, and forced draught blower shell. The impeller disposes in the top of motor, and the impeller has: the last guard shield that has the section of thick bamboo portion of formation suction hole, lower guard shield, and dispose in last guard shield a plurality of blades between the guard shield under and. The forced draught blower shell holds the at least upper end of motor in radial inboard with the impeller. The centrifugation forced draught blower has: the up end of the inner peripheral surface of section of thick bamboo portion or the radial clearance's between outer peripheral face and the forced draught blower shell radial width ratio section of thick bamboo portion and the upside axle clearance's between the forced draught blower shell the narrow upside maze portion of axial width. The centrifugation forced draught blower has: the lower downside maze portion that narrows down of the downside axle clearance's between the upper surface that covers of lower surface and the motor of guard shield axial width part.

Description

Centrifugal blower and vacuum cleaner

Technical field

The utility model relates to centrifugal blower and vacuum cleaner.

Background technique

In the past, in the blast device of vacuum cleaner or the contour output of suction-exhaust device, centrifugal blower was used.Centrifugal blower has: the motor producing driving force; Carry out the impeller of blowing; And hold the blower casing of motor and impeller.In Japanese Unexamined Patent Publication 8-326685 publication, such as disclose centrifugal blower in the past.

In the centrifugal blower of Japanese Unexamined Patent Publication 8-326685 publication, configure circular protrusion to form micro-gap at centrifugal cutter (impeller) and the axial clearance of fixing part of the downside being configured at centrifugal cutter.Thus, a part for the air-flow produced by the rotation of centrifugal cutter (impeller) is inhibit to enter the path different from path of blowing in the downside of centrifugal cutter (impeller).Consequently, inhibit the minimizing (0019 section) of air output.

In recent years, more increasing of demand centrifugal blower exports and high efficiency.Therefore, preferably not only in the downside of impeller, a part for the air-flow produced by vane rotary also to be suppressed to enter the path different from path of blowing in the upside of impeller.

But, for the centrifugal blower that Japanese Unexamined Patent Publication 8-326685 publication is recorded, if merely at centrifugal cutter (namely, impeller) the centrifugal cutter (impeller) of upside and fan guard (blower casing) between also form micro-gap in the axial direction, then not only the axial dimension of centrifugal cutter (impeller) and fixing part manage and becomes difficulty, and centrifugal cutter (impeller) manages with the axial dimension of fan guard (blower casing) and also becomes difficult.

Model utility content

The purpose of this utility model is to provide a kind of manageable axial dimension when assembling centrifugal blower and can suppresses the technology that air output reduces.

In an exemplary mode of execution of the present utility model, centrifugal blower comprises: motor, and it comprises the rotary part rotated centered by the central axis of stationary part and the above downward-extension with motor cover; Impeller, it is configured at the top of described motor, and rotates together with rotary part; And blower casing, at least upper end of motor and impeller are contained in radially inner side by it.Impeller has: the lower shield of tabular, and it is generally perpendicularly expanded relative to central axis, and the lower surface of lower shield is opposed with the upper surface of motor cover; Upper shield, it is configured at the top of lower shield, and has suction port in central authorities; And multiple blade, described multiple blade is configured between lower shield and upper shield.Upper shield has: cylinder portion, and it forms suction port; And upper shield top plate portion, it is expanded from the underpart in cylinder portion towards radial outside.The lower surface of lower shield is opposed in the axial direction across downside axial clearance with the upper surface of motor cover.Downside axial clearance has the downside labyrinth part that axial width local narrows.The upper-end surface in cylinder portion is opposed in the axial direction across upside axial clearance with blower casing.The inner peripheral surface in cylinder portion or outer circumferential face opposed diametrically across radial clearance with blower casing.Radial clearance has the radial width upside labyrinth part narrower than the axial width of upside axial clearance.

Motor cover has the motor jut of the ring-type of giving prominence to upward from the upper surface of motor cover, and downside labyrinth part is formed between motor jut and the lower surface of lower shield.

Motor jut is configured at radial midpoint than the inner peripheral surface of central axis and blower casing by the position of radially inner side.

Centrifugal blower also has the contact part of ring-type, and described contact part is positioned at the lower surface of the described lower shield of impeller, and described contact part contacts with rotary part, and downside labyrinth part is formed between motor jut and the lower surface of contact part.

Impeller has the impeller jut of the ring-type of giving prominence to downward from the lower surface of lower shield, and downside labyrinth part is formed between the upper surface of motor cover and impeller jut.

Downside axial clearance has the multiple downsides labyrinth part radially arranged.

Downside axial clearance has the downside labyrinth part of more than three that radially arrange.

The axial height of one in the labyrinth part of downside is different from another the axial height in the labyrinth part of downside.

Configuration leans on the downside labyrinth part of radially inner side to be configured at than being positioned at the downside labyrinth part position on the lower leaning on radial outside most most.

The radial length of one in the labyrinth part of downside is longer than the radial length of another in the labyrinth part of downside.

Radial clearance has: two upside labyrinth part; And width broadness portion, its radial width is wider than upside labyrinth part, and two upside labyrinth part lay respectively at the axially upside in width broadness portion and the axially downside in width broadness portion.

Radial clearance is between the outer circumferential face and the inner peripheral surface of blower casing in cylinder portion.

Blower casing within it side face has towards the outstanding housing projections of radially inner side.

Upside labyrinth part is formed between the outer circumferential face in housing projections and cylinder portion.

The axial width of upside axial clearance is wider than the axial width of downside labyrinth part.

Motor has: axle, and it is fixed with impeller directly or indirectly; Ball bearing, axle supports as can rotate relative to stationary part by it; And elastic part, it is present between motor cover and ball bearing, and ball bearing is configured at than downside labyrinth part position on the lower.

A kind of vacuum cleaner, it has above-mentioned centrifugal blower.

According to an exemplary mode of execution of the present utility model, easily can manage axial dimension when assembling centrifugal blower, and the minimizing of air output can be suppressed.Further, because vacuum cleaner has above-mentioned centrifugal blower, therefore easily can manage axial dimension when assembling the centrifugal blower that vacuum cleaner has, and the minimizing of air output can be suppressed.

By referring to the detailed description of accompanying drawing to the utility model preferred implementation, above-mentioned and other feature of the present utility model, key element, step, feature and advantage more clearly can be understood.

Accompanying drawing explanation

Fig. 1 is the longitudinal section of the centrifugal blower involved by the first mode of execution.

Fig. 2 is the longitudinal section of the centrifugal blower involved by the second mode of execution.

Fig. 3 is the partial, longitudinal cross-sectional of the centrifugal blower involved by the second mode of execution.

Fig. 4 is the partial, longitudinal cross-sectional of the centrifugal blower involved by a variation.

Fig. 5 is the partial, longitudinal cross-sectional of the centrifugal blower involved by a variation.

Fig. 6 is the partial, longitudinal cross-sectional of the centrifugal blower involved by a variation.

Embodiment

Below, with reference to accompanying drawing, an exemplary mode of execution of the present utility model is described.In addition, in this manual, respectively the direction of the centerline axis parallel with centrifugal blower is called " axis ", the direction orthogonal with the central axis of centrifugal blower is called " radial direction ", the direction along the circumference centered by the central axis of centrifugal blower is called " circumference ".In this manual, will axially as above-below direction, shape and the position relationship of each several part is described on relative to motor with impeller side being.But, the definition of this above-below direction do not limit centrifugal blower during fabrication and use time towards.

<1. the first mode of execution >

Fig. 1 is the longitudinal section of the exemplary centrifugal blower 1A involved by the first mode of execution.As shown in Figure 1, centrifugal blower 1A has: motor 11A; Impeller 12A; And blower casing 13A.

Motor 11A has: the stationary part 20A with motor cover 22A; And the rotary part 30A rotated centered by the central axis 9A of above downward-extension.

Impeller 12A is configured at the top of motor 11A, and rotates together with the rotary part 30A of motor 11A.Impeller 12A has: upper shield 51A; Lower shield 52A; And the multiple blade 53A be configured between upper shield 51A and lower shield 52A.

Upper shield 51A is configured at the top of lower shield 52A.Upper shield 51A has suction port 513A in central authorities.Upper shield 51A has: the cylinder portion 511A forming suction port 513A; And the upper shield top plate portion 512A to expand from the underpart of cylinder portion 511A towards radial outside.Lower shield 52A is the part of the tabular generally perpendicularly expanded relative to central axis 9A.The lower surface of lower shield 52A is opposed with the upper surface of motor cover 22A.

At least upper end of motor 11A and impeller 12A are contained in radially inner side by blower casing 13A.

The inner peripheral surface of cylinder portion 511A is opposed diametrically across radial clearance 71A with blower casing 13A.The upper-end surface of cylinder portion 511A is opposed in the axial direction across upside axial clearance 73A with blower casing 13A.Radial clearance 71A has the radial width upside labyrinth part 81A narrower than the axial width of upside axial clearance 73A.That is, radial clearance 71A has upside labyrinth part 81A.The radial width of upside labyrinth part 81A is narrower than the axial width of upside axial clearance 73A.

The lower surface of lower shield 52A is opposed in the axial direction across downside axial clearance 74A with the upper surface of motor cover 22A.Downside axial clearance 74A has downside labyrinth part 84A, the 85A that axial width local narrows.

In centrifugal blower 1A, by upside labyrinth part 81A and these two kinds of labyrinth part of downside labyrinth part 84A, 85A, the part that restrained effectively the air-flow produced by the rotation of impeller 12A is entered the path different from path of blowing and causes air output to reduce.

In centrifugal blower 1A, upside labyrinth part 81A is not formed at the upper shield 51A of upside axial clearance 73A etc. and the axial clearance of blower casing 13A, but is formed at radial clearance 71A.Thus, even if when impeller 12A departs from relative to blower casing 13A above axis, also inhibits impeller 12A and contact with blower casing 13A.Therefore, easily can manage axial dimension when assembling centrifugal blower 1A, and the minimizing of air output can be suppressed.

<2. the second mode of execution >

<2-1. the structure > of centrifugal blower

Fig. 2 is the longitudinal section of the centrifugal blower 1 involved by the second mode of execution.Centrifugal blower 1 is Scroll-type centrifugal cutter, attracts the air of top, and discharge downwards from the suction port 513 being arranged at top.Scroll-type centrifugal cutter is compared with Xi Luoke type centrifugal cutter, and efficiency is high and noise is few.

The centrifugal blower 1 of present embodiment such as producing attraction force in vacuum cleaner.Because vacuum cleaner has centrifugal blower 1, therefore easily can manage axial dimension when assembling the centrifugal blower 1 that vacuum cleaner has, and the minimizing of air output can be suppressed.But centrifugal blower of the present utility model also may be used for the purposes except vacuum cleaner.Supply other blowing devices of venting gas appliance etc., household appliances, medical equipment, the industrial main equipment etc. that such as also can be installed in for the fan of range hood or the ventilation duct of building carries out air-breathing and exhaust.

As shown in Figure 2, centrifugal blower 1 has: motor 11; Impeller 12; And blower casing 13.Aftermentioned rotary part 30 and the impeller 12 of motor 11 rotate centered by central axis 9.

Motor 11 is brushless DC motors of inner-rotor type.Motor 11 has: stationary part 20; And rotary part 30.Static relative relative to blower casing 13 of stationary part 20.Rotary part 30 is supported to and can rotates centered by central axis 9 relative to stationary part 20.

Stationary part 20 has: stator 21; Motor cover 22; Base plate 23; Circuit board 24; Upper bearing (metal) 25; And lower bearing 26.Rotary part 30 has: axle 31; And rotor 32.

Stator 21 is the armatures producing magnetic flux according to the driving current provided from circuit board 24.Stator 21 surrounds the central axis 9 of downward-extension around annularly.Stator 21 has: stator iron core 211; Insulating part 212; And multiple coil 213.

Stator iron core 211 by laminated electromagnetic steel plate vertically and the stacked steel plate formed form.Stator iron core 211 has: circular core-back 41; And from core-back 41 towards radially inner side outstanding multiple teeth 42.Core-back 41 and central axis 9 configure roughly coaxially.Multiple tooth 42 arranges in the circumferential at substantially equal intervals.

Insulating part 212 is installed on stator iron core 211.The materials'use of insulating part 212 is the resin of insulator.Insulating part 212 covers the both ends of the surface of the axis of tooth 42 and the both ends of the surface of circumference.Coil 213 is consisted of the wire being wound in the surrounding of tooth 42 across insulating part 212.

Motor cover 22 is the parts keeping stator 21 and upper bearing (metal) 25.Motor cover 22 has: upper plate portion 221; Side plate 222; First fixing part 223; Second fixing part 224; And the 3rd fixing part 225.

The position of the tabular that upper plate portion 221 is generally perpendicularly expanded relative to central axis 9 above stator 21.Upper bearing (metal) 25 is maintained at the radially inner side of upper plate portion 221.Side plate 222 is extend from the outer rim of upper plate portion 221 towards axial below roughly cylindricly.Therefore, the upper surface of motor cover 22, namely the upper surface of upper plate portion 221 is generally perpendicularly expanded relative to central axis 9 above stator 21.The outer circumferential face of motor cover 22 extends in tubular downward from the outer rim of the upper surface of motor cover 22.Namely the outer circumferential face of side plate 222 extends in tubular downward from the outer rim of the upper surface of motor cover 22.

First fixing part 223 and the second fixing part 224 are outstanding from the inner peripheral surface of side plate 222 towards radially inner side.First fixing part 223 is configured at the top of the core-back 41 of stator iron core 211.First fixing part 223 has the tapped hole caved in upward from lower surface.Second fixing part 224 is configured at the below of the core-back 41 of stator iron core 211.Second fixing part 224 has the tapped hole of up/down perforation.

Core-back 41 is provided with through hole 411 through vertically.By screw 43 being embedded through hole 411 and being arranged at the tapped hole of motor cover 22, stator 21 is fixed in motor cover 22.

In the motor 11 of present embodiment, the tapped hole of the through hole 411 and the first fixing part 223 and the second fixing part 224 that are embedded with screw 43 is arranged at three places of circumference.In addition, stator 21 is not defined as three places with the fixed position of motor cover 22, can also be two places or everywhere more than, can also be many places.Stator 21 is not defined as screw thread with the fixation method of motor cover 22 and fixes.Stator 21 and motor cover 22 are also fixed by the additive method such as being pressed into or bonding.

3rd fixing part 225 is given prominence to towards radial outside near the underpart of side plate 222.Base plate 23 is fixed by screw thread and is fixed on the 3rd fixing part 225.In the motor 11 of present embodiment, the 3rd fixing part 225 is arranged at three places of circumference.In addition, motor cover 22 is not defined as three places with the fixed position of base plate 23, can also be two places or everywhere more than, can also be many places.Motor cover 22 and base plate 23 also can be fixed by the additive method such as being pressed into or bonding.

Base plate 23 is parts at least partially of the opening of the below covering motor cover 22.Base plate 23 is generally perpendicularly expanded relative to central axis 9.Lower bearing 26 is maintained in the central authorities of base plate 23.Stator 21, circuit board 24, upper bearing (metal) 25, lower bearing 26 and rotor 32 are contained in the inside of the shell be made up of motor cover 22 and base plate 23.

Circuit board 24 is generally perpendicularly configuring relative to central axis 9 than stator 21 position on the lower.The electronic component (omitting diagram) of the circuit be configured with for providing driving current to coil 213 is equipped with at circuit board 24.The end forming the wire of coil 213 is electrically connected with the circuit on circuit board 24.

Upper bearing (metal) 25 is the mechanisms of being supported by axle 31 as rotating relative to motor cover 22.Upper bearing (metal) 25 is configured at than aftermentioned downside labyrinth part 84 to 86 position on the lower.Lower bearing 26 is the mechanisms of being supported by axle 31 as rotating relative to base plate 23.Upper bearing (metal) 25 and lower bearing 26 are such as used in the ball bearing that there is spherical rotor between inner ring and outer ring.Therefore, axle 31 supports as rotating relative to stationary part 20 by ball bearing.Ball bearing is configured at than downside labyrinth part 84 to 86 position on the lower.

In the present embodiment, elastic part 27 is present between motor cover 22 and ball bearing.Say in further detail, between motor cover 22 and upper bearing (metal) 25, have elastic part 27.Thereby, it is possible to vibration when reduction motor 11 and impeller 12 rotate.

Axle 31 is columned parts of centrally axis 9 configuration.Axle 31 is supported by upper bearing (metal) 25 and lower bearing 26, and rotates centered by central axis 9.The upper end portion of axle 31 than motor cover 22 towards upwardly projecting.Impeller 12 is fixed with in the upper end portion of axle 31.In the present embodiment, impeller 12 is directly fixed on axle 31.But impeller 12 also can be fixed on axle 31 across other parts indirectly.Namely impeller 12 is fixed on axle 31 directly or indirectly.

Rotor 32 is fixed on axle 31, and rotates together with axle 31.The rotor 32 of present embodiment is made up of the magnet resin being formed as substantially cylindrical shape.Rotor 32 outer circumferential face circumferentially alternating magnetization have N pole and S pole.The outer circumferential face of rotor 32 is opposed diametrically across small gap with the end face of the radially inner side of tooth 42.That is, rotor 32 has the magnetic pole strength opposed diametrically with stator 21.

In addition, in the present embodiment, the resinous rotor 32 of magnet is used.But rotor 32 also can be fixed on the outer circumferential face or inside that multiple magnet is the rotor iron core of the cylindrical shape of magnetic.

When motor 11 drives, provide driving current from the circuit circuit board 24 to coil 213, produce magnetic flux at multiple teeth 4 of stator iron core 211.Thus, the torque of circumference is produced by the effect of the magnetic flux between tooth 42 and rotor 32.Consequently, rotary part 30 rotates centered by central axis 9.Impeller 12 rotates together with rotary part 30.

Impeller 12 is impellers of so-called Scroll-type centrifugal cutter.Impeller 12 is configured at the top of the motor cover 22 of motor 11.As shown in Figure 2, impeller 12 has: upper shield 51; Lower shield 52; And multiple blade 53.

Upper shield 51 has: cylinder portion 511; Upper shield top plate portion 512; And suction port 513.Upper shield 51 is configured at the top of lower shield 52 and multiple blade 53.

Cylinder portion 511 is the roughly cylindric positions centered by central axis 9.In the present embodiment, how the internal diameter axial position in cylinder portion 511 all remains constant.In addition, cylinder portion 511 also can be along with the shape expanding gradually towards axial below.

Upper shield top plate portion 512 is expanded from the underpart in cylinder portion 511 towards radial outside.The radial position of the outer rim of upper shield top plate portion 512 is roughly the same with the radial position of the outer rim of lower shield 52.Suction port 513 is configured at the central authorities of upper shield 51.Suction port 513 is formed by cylinder portion 511, and the radially inner side of intakeport 513 in cylinder portion 511 through upper shield 51 vertically.

The position of the tabular that lower shield 52 is generally perpendicularly expanded relative to central axis 9 above motor cover 22.The lower surface of lower shield 52 is opposed in the axial direction with the upper surface of motor cover 22.The end winding support of the radially inner side of lower shield 52 is in the axle 31 of motor 11.

Blade 53 is configured between upper shield 51 and lower shield 52.Multiple blade 53 configures in the circumferential at substantially equal intervals.When centrifugal blower 1 drives, the gas between upper shield 51 and lower shield 52 is accelerated towards radial outside by multiple blade 53.

Blower casing 13 has: upper housing top plate portion 131; And wall portion 132.Upper housing top plate portion 131 is configured at the top of impeller 12, and expands annularly along the upper surface of upper shield 51.Upper housing top plate portion 131 has central hole 130 in central authorities.Wall portion 132 from upper housing top plate portion 131 motor 11 radial outside downward in tubular extend.Motor 11 and impeller 12 are contained in the radially inner side of wall portion 132.

In the present embodiment, blower casing 13 is formed by the part of upper housing 133, central shell 134 and these three ring-types of downside shell 135.Central authorities' shell 134 is configured at the below of upper housing 133.Downside shell 135 is configured at the below of central shell 134.Upper housing 133 comprises: upper housing top plate portion 131; And the upper end of wall portion 132.Central authorities' shell 134 and downside shell 135 are the parts of the tubular forming wall portion 132 respectively.In addition, in the present embodiment, blower casing 13 is formed by three parts.But blower casing 13 can also be formed by least one part, such as, formed by a part, can also be formed by the part of more than two or four.

The inner peripheral surface of the outer circumferential face of motor cover 22 and the wall portion 132 of blower casing 13 is arranged at intervals diametrically.Space between the outer circumferential face of motor cover 22 and the inner peripheral surface of wall portion 132 is the stream 10 of centrifugal blower 1 gas when driving.

<2-2. about the flowing > of air-flow

Next, the flowing of air-flow when driving centrifugal blower 1 with reference to Fig. 2 and Fig. 3 is described.Fig. 3 is the partial, longitudinal cross-sectional of centrifugal blower 1.

When centrifugal blower 1 drives, the stator 21 to motor 11 provides driving current, and rotary part 30 and the impeller 12 of motor 11 rotate.If impeller 12 rotates, then as shown in the solid arrow in Fig. 2 and Fig. 3, the gas of the top of blower casing 13 is attracted by the central hole 130 of blower casing 13 and the suction port 513 of impeller.Then, gas is by being discharged to the radial outside of impeller 12 between upper shield 51 and lower shield 52.

As shown in Figure 2, between the outer circumferential face and the inner peripheral surface of wall portion 132 of motor cover 22, stream 10 is formed.The gas of discharging to the radial outside of impeller 12 changes direction down near the wall portion 132 of blower casing 13, enters in stream 10 below axially.Then, gas is discharged from the underpart of stream 10 to the outside of centrifugal blower 1.

At this, the upper housing top plate portion 131 of blower casing 13 has at its radial inner end: inner annular portion 61; Connect annulus 62; And outside annulus 63.Inner annular portion 61 is configured at the position leaning on radial inner end most of upper housing top plate portion 131.Inner annular portion 61 is configured at the radially inner side in the cylinder portion 511 of impeller 12, and is the roughly cylindric position vertically extended.Connecting annulus 62 is the tabular and circular position that extend from the upper end in inner annular portion 61 towards radial outside.Outside annulus 63 is positions of tubular, and outside annulus 63 extends downward from the outer rim connecting annulus 62, and is configured at the radial outside in a portion 511.In the present embodiment, outside annulus 63 is cone surface shape, outside annulus 63 along with from upper end downward the distance of distance center axis 9 become large gradually.

Blower casing 13 has the annular element 136 of the inner peripheral surface being fixed on outside annulus 63.Annular element 136 has the housing projections 64 of two ring-types.Housing projections 64 is outstanding from the inner peripheral surface of outside annulus 63 towards radially inner side.Two housing projections 64 are arranged at intervals in the axial direction in the upper end portion of annular element 136 and underpart respectively.In addition, annular element 136 can also be the part with outside annulus 63 one, and the housing projections 64 of two ring-types also can be the position of being given prominence to towards radially inner side by the inner peripheral surface of outside annulus 63 and being formed.

The inner peripheral surface in cylinder portion 511 or outer circumferential face opposed diametrically across radial clearance with blower casing 13.The inner peripheral surface in the cylinder portion 511 of impeller 12 is opposed diametrically across inner side radial clearance 71 with the outer circumferential face in the inner annular portion 61 of blower casing 13.The outer circumferential face in the cylinder portion 511 of impeller 12 is opposed diametrically across outer radial gap 72 with the inner peripheral surface of the annular element 136 of blower casing 13.The upper-end surface in the cylinder portion 511 of impeller 12 is opposed in the axial direction across upside axial clearance 73 with the lower surface of the connection annulus 62 of blower casing 13.

Inner side radial clearance 71 be radial width narrower than the axial width of upside axial clearance 73 first on the upside of labyrinth part 81.Outer radial gap 72 have radial width narrower than the axial width of upside axial clearance 73 second on the upside of labyrinth part 83 on the upside of labyrinth part 82 and the 3rd.As Fig. 3 amplifies expression, on the upside of in the of first, the radial width D1 of labyrinth part 81 is narrower than the axial width D2 of upside axial clearance 73.On the upside of in the of second, on the upside of labyrinth part 82 and the 3rd, the radial width D3 of labyrinth part 83 is narrower than the axial width D2 of upside axial clearance 73.

Between the outer circumferential face of outer radial gap 72 in cylinder portion 511 and the inner peripheral surface of blower casing 13.On the upside of in the of second, labyrinth part 82 is formed between the outer circumferential face in housing projections 64 and cylinder portion 511.On the upside of in the of 3rd, labyrinth part 83 is formed between the outer circumferential face in a portion 511 and the housing projections 64 of downside.Outer radial gap 72 has: two upside labyrinth part 82,83; And width broadness portion 89.The radial width in width broadness portion 89 is wider than the radial width D3 of upside labyrinth part 82,83.Therefore, two upside labyrinth part 82,83 are configured at the axially upside in width broadness portion 89 and axial downside respectively.More particularly, outer radial gap 72 have between labyrinth part 83 on the upside of labyrinth part 82 and the 3rd on the upside of second radial width than upside labyrinth part 81,82,83 wide width broadness portions 89.That is, labyrinth part 82 is configured at the axially upside in width broadness portion 89 on the upside of second.On the upside of in the of 3rd, labyrinth part 83 is configured at the axially downside in width broadness portion 89.

Thus, upside labyrinth part 81,82,83 is provided with between near the cylinder portion 511 of impeller 12 and the inner end of blower casing 13.Thus, inhibit by multiple blade 53 towards the radial outside of impeller 12 spue and as shown in the dotted arrow in Fig. 3, leak into the space between upper shield 51 and blower casing 13 towards a part for the gas of stream 10.

Blower casing 13 within it side face has towards the outstanding housing projections 64 of radially inner side.Thereby, it is possible to easily arrange multiple upsides labyrinth part 82,83 in outside radial clearance 72.Compared with the situation in the longer upside labyrinth part of outside radial clearance 72 whole installation one, by arranging two upside labyrinth part 82,83 in outside radial clearance 72, air-flow in outside radial clearance 72 can be suppressed further to flow vertically.That is, further suppress a part for the gas spued towards the radial outside of impeller 12 by multiple blade 53 to the spatial leaks between upper shield 51 and blower casing 13.Thus, housing projections 64 can be formed according to required labyrinth characteristic.Therefore, it is possible to obtain by low cost and simple for the purpose of labyrinth characteristic.Consequently, in centrifugal blower 1, inhibit the minimizing of air output.

In order in outside radial clearance 72 whole installation one upside labyrinth part, need the dimensional accuracy improving the face entirety forming outer radial gap 72.On the other hand, by arranging width broadness portion 89, operating efficiency when size management becomes easy and improves manufacture.Compared with arranging the situation of single upside labyrinth part 82, by arranging multiple upsides labyrinth part 82,83, inhibit and leaking into space between upper shield 51 and blower casing 13 towards a part for the gas of stream 10.

By labyrinth part 81 on the upside of arranging first in inner side radial clearance 71, labyrinth part 83 on the upside of labyrinth part 82 and the 3rd on the upside of outside radial clearance 72 arranges second, arranges three upside labyrinth part 81,82,83 between near the cylinder portion 511 of impeller 12 and the inner end of blower casing 13.Thus, by arranging more upside labyrinth part, further suppress by multiple blade 53 towards the radial outside of impeller 12 spue and leak into the space between upper shield 51 and blower casing 13 towards the part of the gas of stream 10.

The lower surface of the lower shield 52 of impeller 12 is opposed in the axial direction across downside axial clearance 74 with the upper surface of motor cover 22.As shown in Figure 3, the pad 14 of roughly T-shaped shape contacts with the lower surface of impeller 12.Pad 14 has: the axle portion 141 of tubular; And lip part 142.The inner peripheral surface in axle portion 141 contacts with the outer circumferential face of axle 31.Lip part 142 extends from the upper end in axle portion 141 towards radial outside.The lower end surface in axle portion 141 contacts with the upper surface of upper bearing (metal) 25.That is, in the present embodiment, pad 14 is contact parts.Contact part is positioned at the lower surface of the lower shield 52 of impeller 12, and contacts with rotary part 30.

Impeller 12 is inhibit to offset towards the position axially by pad 14.Thus, inhibit impeller 12 to be shifted to the lower side towards axle, impeller 12 contacts with motor cover 22.The lower surface of the lip part 142 of pad 14 is opposed in the axial direction across downside axial clearance 74 with the upper surface of motor cover 22.

Motor cover 22 has the motor jut 226,227,228 from three outstanding upward ring-types of the upper surface of motor cover 22.Three motor juts 226,227,228 arrange diametrically.

Being configured at by labyrinth part 84 on the downside of being formed with first between the first motor jut 226 of radial outside and the lower surface of lower shield 52 in three motor juts 226,227,228.Labyrinth part 85 be formed with second between the second motor jut 227 of radial outside being configured at the radially inner side of the first motor jut 226 and the 3rd motor jut 228 and the lower surface of lower shield 52 on the downside of.Being configured at by labyrinth part 86 on the downside of being formed with the 3rd between the 3rd motor jut 228 of radially inner side and the lower surface of the lip part 142 of pad 14 in three motor juts 226,227,228.In the present embodiment, pad 14 is contact parts.That is, downside labyrinth part 86 is formed between motor jut 228 and the lower surface of contact part.

Thus, downside axial clearance 74 has three downside labyrinth part 84,85,86 that axial width local narrows.That is, downside labyrinth part 84,85,86 is formed at motor jut 226, between 227,228 and the lower surface of lower shield 52.Thus, gas is inhibit to leak towards radially inner side in downside axial clearance 74 from the radial outside of impeller 12 along the outer circumferential face of motor 11 towards the air-supply path in stream 10.

In the present embodiment, be not in solid of rotation and impeller 12 side, but stationary components and motor cover 22 side arrange jut and motor jut 226,227,228.Therefore, it is possible to form downside labyrinth part 84,85,86.Thus, compared with the situation of jut is set with the lower surface of the lower shield 52 at impeller 12, the load of the centrifugal force acting on impeller 12 etc. can be reduced.

As mentioned above, in centrifugal blower 1, a part for the air-flow produced by the rotation of impeller 12 is inhibit to enter the path different from path of blowing by upside labyrinth part 81,82,83 and these two kinds of labyrinth part of downside labyrinth part 84,85,86.Therefore, the air output that restrained effectively centrifugal blower 1 reduces.

Now, upside labyrinth part 81,82,83 is not formed at the upper shield 51 of upside axial clearance 73 etc. and the axial clearance of blower casing 13, but is formed at inner side radial clearance 71 and outer radial gap 72.Thus, even if when impeller 12 offsets relative to blower casing 13 above axis, also inhibits impeller 12 and contact with blower casing 13.Therefore, easily can manage axial dimension at assembling centrifugal blower 1, and the minimizing of air output can be suppressed.

On the height of axis, tolerance is produced respectively at each several part such as motor cover 22, impeller 12, blower casing 13 forming centrifugal blower 1.Therefore, if arranged by the axial width of upside axial clearance 73 narrower than the axial width of downside labyrinth part 84,85,86, then, when assembling centrifugal blower 1, there is the worry that blower casing 13 contacts with upper shield 51.

But in this centrifugal blower 1, the axial width of upside axial clearance 73 is wider than the axial width of downside labyrinth part 84,85,86.Therefore, even if when the tolerance of each several part is larger, as long as accurately manage the axial clearance between motor cover 22 and impeller 12 in the axial direction.

In the present embodiment, downside axial clearance 74 has the multiple downsides labyrinth part 84,85,86 arranged diametrically.Thus, respectively the axial width of downside labyrinth part 84,85,86 need not be arranged extremely narrow, just can suppress the leakage of gas.Therefore, even if when impeller 12 offsets above axis relative to motor 11, also can suppress between the lower surface and the upper surface of motor 11 of impeller 12, produce radial air-flow.That is, axial dimension can be managed more easily when assembling centrifugal blower 1.

In centrifugal blower 1, downside axial clearance 74 has the downside labyrinth part 84,85,86 of more than three that arrange diametrically.Thus, be there is by downside axial clearance 74 the downside labyrinth part of more than three, Leakage Gas can be suppressed further.

With arrange in downside axial clearance 74 one downside labyrinth part situation with do not arrange downside labyrinth part situation compared with, higher at the attraction work ratio in the lower region of the rotating speed of motor 11 (such as dividing speed 5000 turns), but do not significantly improve at the attraction work ratio in the higher region (such as dividing speed 60000 turns) of rotating speed.Along with the increase of quantity of downside labyrinth part being arranged at downside axial clearance 74, the region attraction work ratio higher at the rotating speed of motor 11 also improves.

When for vacuum cleaner, centrifugal blower 1 such as uses in the region that the rotating speed dividing speed 60000 to turn left the right side is higher.Therefore, the downside labyrinth part of more than three is preferably set in downside axial clearance 74.

In the present embodiment, the first motor jut 226 of the outermost side in three motor juts 226,227,228 is configured at the substantial middle of the inner peripheral surface of central axis 9 and blower casing 13.Thus, by as much as possible motor jut 226,227,228 being configured at radially inner side, even if when impeller 12 High Rotation Speed, the resistance that impeller 12 bears also can be reduced.Be more preferably motor jut 226,227,228 and be configured at the position leaning on radially inner side than central axis 9 and the radial midpoint of the inner peripheral surface of blower casing 13.Thus, even if when impeller 12 High Rotation Speed, the resistance that impeller 12 bears can also be reduced.

As shown in Figure 3, labyrinth part 86 is configured at the position by axial below of labyrinth part 85 on the downside of labyrinth part on the downside of than first 84 and second on the downside of the 3rd.That is, being configured in downside labyrinth part 84,85,86 is configured at than being positioned at by the position of labyrinth part 84 on the downside of first of radial outside by axial below by labyrinth part 86 on the downside of the 3rd of radially inner side the.Thus, an axial height in downside labyrinth part 84,85,86 is different from another the axial height in multiple downsides labyrinth part 84,85,86.Thus, further suppress and produce radial air-flow in downside axial clearance 74.

On the downside of in the of first the radial length of labyrinth part 84 than second on the downside of labyrinth part 85 radial length and the 3rd on the downside of the radial length of labyrinth part 86 long.Thus, by arranging the longer downside labyrinth part of radial length, further suppress the air-flow produced in the axial clearance of downside from radial outside towards inner side.Therefore, a radial length in the labyrinth part 84,85,86 of preferred downside is longer than another the radial length in downside labyrinth part 84,85,86.Particularly as in the present embodiment, preferably will arrange longer diametrically by labyrinth part 84 on the downside of first of radial outside.

<3. variation >

Above exemplary mode of execution of the present utility model is illustrated, but the utility model is not limited to above-mentioned mode of execution.

Fig. 4 is the partial, longitudinal cross-sectional of the centrifugal blower 1B involved by a variation.In the diagram, impeller 12B has impeller jut 521B, 522B of ring-type.Impeller jut 521B, 522B give prominence to downward from the lower surface of lower shield 52B.Impeller jut 521B, 522B of two ring-types arrange diametrically.

Downside axial clearance 74B is formed between the lower surface and motor cover 22B of lower shield 52B.Downside axial clearance 74B has three downside labyrinth part 84B, 85B, 86B.That is, downside labyrinth part 84B, 85B are formed between the upper surface of motor cover 22B and impeller jut 521B, 522B.Thus, gas is inhibit to leak towards radially inner side in the axial clearance 74B of downside from the radial outside of impeller 12B along the outer circumferential face of motor towards the air-supply path in stream.On the downside of in the of on the downside of in the of three in labyrinth part 84B, 85B, 86B first, on the downside of labyrinth part 84B and second, labyrinth part 85B is formed between the upper surface of motor cover 22B and impeller jut 521B, 522B respectively.Three downside labyrinth part 84B, being configured in 85B, 86B are formed between the upper surface of motor cover 22B and the lip part 142B of pad 14B by labyrinth part 86B on the downside of the 3rd of radially inner side the.That is, as shown in the example of fig. 4, also by arranging projection to be formed downside labyrinth part 84B, 85B in impeller 12B side.

Fig. 5 is the partial, longitudinal cross-sectional of the centrifugal blower 1C involved by other variation.In Figure 5, the outside annulus 63C of blower casing 13C is formed as substantially cylindrical shape.Blower casing 13C does not have annular element.

The inner peripheral surface of the cylinder portion 511C of impeller 12C is opposed diametrically across inner side radial clearance 71C with the outer circumferential face of the inner annular portion 61C of blower casing 13C.The outer circumferential face of the cylinder portion 511C of impeller 12C is opposed diametrically across outer radial gap 72C with the inner peripheral surface of the outside annulus 63C of blower casing 13C.The upper-end surface of the cylinder portion 511C of impeller 12C is opposed in the axial direction across upside axial clearance 73C with the lower surface of the connection annulus 62C of blower casing 13C.

Inner side radial clearance 71C be radial width narrower than the axial width of upside axial clearance 73C first on the upside of labyrinth part 81C.Outer radial gap 72C be radial width narrower than the axial width of upside axial clearance 73C second on the upside of labyrinth part 82C.Namely outer radial gap 72C is labyrinth part 82C on the upside of in the of second.On the upside of in the of second, the radial width of labyrinth part 82C is narrower than the axial width of upside axial clearance 73C.As shown in the example of figure 5, blower casing 13C can not have annular element yet.

Fig. 6 is the partial, longitudinal cross-sectional of the centrifugal blower 1D involved by other variation.In figure 6, the outside annulus 63D of blower casing 13D has: the upside cylindrical part 631D of substantially cylindrical shape; The downside cylindrical part 632D of substantially cylindrical shape; And recess 633D.Recess 633D caves in towards radial outside than upside cylindrical part 631D and downside cylindrical part 632D.Recess 633D is configured at the downside of cylindrical part 631D, upside and the upside of downside cylindrical part 632D.Blower casing 13D does not have annular element.

The inner peripheral surface of the cylinder portion 511D of impeller 12D is opposed diametrically across inner side radial clearance 71D with the outer circumferential face of the inner annular portion 61D of blower casing 13D.The outer circumferential face of the cylinder portion 511D of impeller 12D is opposed diametrically across outer radial gap 72D with the inner peripheral surface of the outside annulus 63D of blower casing 13D.The upper-end surface of the cylinder portion 511D of impeller 12D is opposed in the axial direction across upside axial clearance 73D with the lower surface of the connection annulus 62D of blower casing 13D.

Inner side radial clearance 71D be radial width narrower than the axial width of upside axial clearance 73D first on the upside of labyrinth part 81D.In other words, inner side radial clearance 71D is labyrinth part 81D on the upside of in the of first.On the upside of in the of first, the radial width of labyrinth part 81D is narrower than the axial width of upside axial clearance 73D.Outer radial gap 72D have radial width narrower than the axial width of upside axial clearance 73D second on the upside of labyrinth part 83D on the upside of labyrinth part 82D and the 3rd.In other words, outer radial gap 72D have second on the upside of labyrinth part 83D on the upside of labyrinth part 82D and the 3rd.On the upside of in the of second, on the upside of labyrinth part 82D and the 3rd, the radial width of labyrinth part 83D is narrower than the axial width of upside axial clearance 73D.Between the outer circumferential face that on the upside of in the of second, labyrinth part 82D is formed at the cylinder portion 511D of impeller 12D and the inner peripheral surface of upside cylindrical part 631D.Between the outer circumferential face that on the upside of in the of 3rd, labyrinth part 83D is formed at the cylinder portion 511D of impeller 12D and the inner peripheral surface of downside cylindrical part 632D.

As shown in the example of Figure 6, also by outside annulus 63D, there is upside cylindrical part 631D, downside cylindrical part 632D and recess 633D and form two upsides labyrinth part 82D, 83D at outside radial clearance 72D.

The shape of the detail section of each part also can be different from the shape shown in each figure.Above-mentioned each key element also can be carried out appropriately combined in the scope do not conflicted.

The utility model such as can be used in centrifugal blower and vacuum cleaner.

Claims (15)

1. a centrifugal blower, comprising:

Motor, it comprises the rotary part rotated centered by the central axis of stationary part and the above downward-extension with motor cover;

Impeller, it is configured at the top of described motor, and rotates together with described rotary part; And

Blower casing, at least upper end of described motor and described impeller are contained in radially inner side by it,

Described impeller has:

The lower shield of tabular, it is generally perpendicularly expanded relative to described central axis, and the lower surface of described lower shield is opposed with the upper surface of described motor cover;

Upper shield, it is configured at the top of described lower shield, and has suction port in central authorities; And

Multiple blade, described multiple blade is configured between described lower shield and described upper shield,

Described upper shield has:

Cylinder portion, it forms described suction port; And

Upper shield top plate portion, it is expanded from the underpart in described cylinder portion towards radial outside, and the feature of described centrifugal blower is,

The lower surface of described lower shield is opposed in the axial direction across downside axial clearance with the upper surface of described motor cover,

Described downside axial clearance has the downside labyrinth part that axial width local narrows,

The upper-end surface in described cylinder portion is opposed in the axial direction across upside axial clearance with described blower casing,

Inner peripheral surface or the outer circumferential face in described cylinder portion are opposed diametrically across radial clearance with described blower casing,

Described radial clearance has the radial width upside labyrinth part narrower than the axial width of described upside axial clearance.

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

Described motor cover has the motor jut of the ring-type of giving prominence to upward from the upper surface of described motor cover,

Described downside labyrinth part is formed between described motor jut and the lower surface of described lower shield.

3. centrifugal blower according to claim 2, is characterized in that,

Described motor jut is configured at radial midpoint than the inner peripheral surface of described central axis and described blower casing by the position of radially inner side.

4. centrifugal blower according to claim 3, is characterized in that,

Described centrifugal blower also has the contact part of ring-type, and described contact part is positioned at the lower surface of the described lower shield of described impeller, and described contact part contacts with described rotary part,

Described downside labyrinth part is formed between described motor jut and the lower surface of described contact part.

5. centrifugal blower according to claim 1, is characterized in that,

Described impeller has the impeller jut of the ring-type of giving prominence to downward from the lower surface of described lower shield,

Described downside labyrinth part is formed between the upper surface of described motor cover and described impeller jut.

6. centrifugal blower according to claim 1, is characterized in that,

Described downside axial clearance has the multiple described downside labyrinth part arranged diametrically.

7. centrifugal blower according to claim 6, is characterized in that,

Described downside axial clearance has the described downside labyrinth part of more than three that arrange diametrically.

8. centrifugal blower according to claim 7, is characterized in that,

The axial height of one in the labyrinth part of described downside is different from another the axial height in the labyrinth part of described downside.

9. centrifugal blower according to claim 8, is characterized in that,

Be configured at and lean on the described downside labyrinth part of radially inner side to be configured at than being positioned at the labyrinth part position on the lower, described downside leaning on radial outside most most.

10. centrifugal blower according to claim 7, is characterized in that,

The radial length of one in the labyrinth part of described downside is longer than another the radial length in the labyrinth part of described downside.

11. centrifugal blowers according to any one of claim 1 to 10, is characterized in that,

Described radial clearance has:

Two described upside labyrinth part; And

Width broadness portion, its radial width is wider than described upside labyrinth part,

Two described upside labyrinth part lay respectively at the axially upside in described width broadness portion and axial downside.

12. centrifugal blowers according to claim 11, is characterized in that,

Described radial clearance between the outer circumferential face and the inner peripheral surface of described blower casing in described cylinder portion,

Described blower casing within it side face has towards the outstanding housing projections of radially inner side,

Described upside labyrinth part is formed between the outer circumferential face in described housing projections and described cylinder portion.

13. centrifugal blowers according to any one of claim 1 to 10, is characterized in that,

The axial width of described upside axial clearance is wider than the axial width of described downside labyrinth part.

14. centrifugal blowers according to any one of claim 1 to 10, is characterized in that, described motor has:

Axle, it is fixed with described impeller directly or indirectly;

Ball bearing, described axle supports as can rotate relative to described stationary part by it; And

Elastic part, it is present between described motor cover and described ball bearing,

Described ball bearing is configured at than labyrinth part position on the lower, described downside.

15. 1 kinds of vacuum cleaner, is characterized in that,

Described dust catcher is had the right the centrifugal blower according to any one of requirement 1 to 14.