CN1212479C

CN1212479C - Vane of centrifugal blower and centrifugal blower with said vane

Info

Publication number: CN1212479C
Application number: CN02141237.5A
Authority: CN
Inventors: 东田匡史
Original assignee: Daikin Industries Ltd
Current assignee: Daikin Industries Ltd
Priority date: 2001-06-28
Filing date: 2002-06-28
Publication date: 2005-07-27
Anticipated expiration: 2022-06-28
Also published as: EP1411248B1; EP1411248A4; EP1411248A1; CN2575343Y; CN1395045A; WO2003002873A1; ATE556226T1; ES2387063T3; EP1411248B8

Abstract

The present invention provides an impeller allowing noise to be reduced and a low noise centrifugal blower, the multi-vane centrifugal blower (40) comprising mainly an impeller (63), a casing (11) covering the impeller (63), and a motor (14) rotating the impeller (43), wherein the impeller (43) is so formed that a plurality of blades (33) are fixed to the outer peripheral edge of a disk-like main plate (61) and the other ends of the plurality of blades are connected to each other through an annular side plate (62), the plurality of blades (33) are formed on the outer peripheral edge of the main plate (61) at equal intervals in rotating direction, an irregular waveform shape (64) is formed near the inner peripheral edge part of the plurality of blades (33) along the periphery of the inner peripheral edge part, and an irregular waveform (66) is formed on the surface of the side plate (62) on the main plate (61) side.

Description

The impeller of centrifugal blower and possess the centrifugal blower of this impeller

Technical field

The present invention relates to a kind of centrifugal blower impeller and possess the centrifugal blower of this impeller, especially relate to centrifugal blower impeller that a kind of many pieces of blade tips that extend from mainboard connect by the ring-type side plate and the centrifugal blower that possesses this impeller.

Background technique

In gas conditioners such as gas purifier, air conditioner (hereinafter referred to as air conditioner), use the centrifugal blower air-supply.As example in the past is Fig. 1～centrifugal blower that is called multiblade blower one example shown in Figure 3.Fig. 1 is the multiblade blower side view of example in the past; Fig. 2 is the oblique drawing of the multiblade blower impeller of example in the past; Fig. 3 is the multiblade blower impeller plan view of example in the past.

Multiblade blower 10 is to be made of the motor 14 of impeller 13, the casing 11 that covers impeller 13, rotating impeller 13 etc., and many pieces of blades 33 1 ends of impeller 13 are fixed in the outer periphery of disk mainboard 31, and the other end connects with annular side plate 32.Form the intake grill 11b of air blowing opening 11a, bellmouth 12 encirclements on the casing 11.Side plate 32 subtends of intake grill 11b and impeller 13 and putting.Again, air blowing opening 11a is formed at the orthogonal direction with intake grill 11b, guarantees impeller 13 rotating shaft O-O are done the roughly air-supply of orthogonal direction.

If rotary motor 14 makes multiblade blower 10 work, then impeller 13 relative casings 11 are towards the gyratory directions R revolution of Fig. 3.Thus, each blade 33 of impeller 13 to the outer circumferential side gas bleeding, sucks gas from intake grill 11b all sides space in impeller 13 from interior all sides space, and simultaneously, the gas that is pressed out to impeller 13 outer circumferential sides is sent by air blowing opening 11a.Just, multiblade blower 10 sucks gas from intake grill 11b, and 11a sends gas from air blowing opening.

In such multiblade blower 10, because near the turbulent eddy that produces circular mainboard 31 causes noise.Concrete, described noise is produced by following mechanism.

In impeller 13 inside, the gas that sucks from intake grill 11b main as Fig. 1 (a) shown in like that, from towards the slowly outside Zhou Liudong (with reference to gas stream W) of the direction of circular mainboard 31., like that, a part that sucks gas from intake grill 11b closely is close to circular mainboard 31 collisions back to there being part to flow to outer circumferential side (seeing gas stream X) at circular mainboard 31 shown in Fig. 1 (b).The turbulent eddy that generation causes by circular mainboard 31 is collided among this gas stream X.This turbulent eddy is along with gas stream X flows to peripheral direction, again with the gas stream interflow of colliding circular mainboard 31.And the turbulent eddy of gas stream X slowly develops, and forms maximum turbulent eddy in the inner side edge portion of blade 33, and the turbulent eddy of the maximum of described formation is extracted out to outer circumferential side by blade 33, produces noise.

Again, in such multiblade blower 10, it is the vortex at center that generation closely is close to side plate 32 outer circumference end.Its vortex is helpless to the air-supply function of impeller 13, and the result becomes the reason that gas fan efficient reduces and produce noise.Described vortex is concrete, is produced by following genesis mechanism.

In the inside of impeller 13, the gas that sucks from intake grill 11b main as Fig. 1 (a) shown in like that, from towards the slowly outside Zhou Liudong (seeing gas stream W) of the direction of circular mainboard 31., shown in Fig. 1 (c), a part of gas in the casing 11 side plate 32 closely be close to be pumped to impeller 13 peripheries after, produce closely to be close to and be inhaled into the such vortex Y of all sides in the impeller 13 again from the bellmouth 12 of impeller 13.Therefore.In impeller 13, produce the axial length b of vortex Y part to the work of can not effectively blowing of the ratio b/B of impeller 13 entire axial length B (below, be decided to be blockage factor BF) considerable part, thereby produce and send efficient to reduce and noise.

To being used for the multiblade blower of air conditioner, people further require low noiseization.Again, closely be close to the noise that the turbulization vortex causes, not only result from multiblade blower, and also be to comprise the problems that centrifugal blower had jointly such as turbine gas fan at circular mainboard.

Summary of the invention

The object of the present invention is to provide a kind of impeller that may reduce noise, and the centrifugal blower that a kind of low noise is provided.

The impeller of the described centrifugal blower in the 1st aspect of the present invention comprises: be the mainboard of center steering with the rotating shaft; With the rotating shaft be center configuration circlewise, an end is fixed in many pieces of blades on the mainboard separately; The side plate that connects the many pieces of blade the other ends.And, in closely being close to of interior all side edge parts of the many pieces of blades at least of the side plate side of mainboard one side, be formed with cancavo-convex waveform shape.

In the impeller of this centrifugal blower, because at interior all side edge parts of the blade at least of the side plate side of mainboard one side cancavo-convex waveform shape that nearby is shaped, therefore, by the turbulent eddy of gas stream, destroyed before arriving blade, diminish to the collision of mainboard and the development of gas stream interflow.Thereby the noise that takes place in the time of making blade gas bleeding stream is little.

As previously mentioned, turbulent eddy is along with all effluents in mainboard grow up to outer circumferential side, and effective method is, before being about to be extracted out by blade turbulent eddy diminished.That is, will to be arranged on the side plate side one side of mainboard be closely being close to of all side edge parts in the blade to the waveform shape shaping position at least.Be more preferably, waveform shape is preferably disposed on the interior all side edge parts of blade in the blade radial length range of interior all sides, does not make because of waveform shape destroys the turbulent eddy that diminishes and develops once more.

Not only closely be close to, and also waveform shape can be set in the rotating shaft vicinity in the inboard side portion of blade again.Like this, the turbulent eddy that produces whenever gas stream collision mainboard is diminished.

The impeller of the described centrifugal blower in the present invention the 2nd aspect comprises: be the mainboard of center steering with the rotating shaft; With the rotating shaft be center configuration circlewise, an end is fixed in many pieces of blades of mainboard separately; The ring-type side plate that connects the blade the other end.And the mainboard side of side plate is simultaneously gone up the cancavo-convex waveform shape that is shaped.

In the impeller of this centrifugal blower, because the cancavo-convex waveform shape that is shaped on the face of the mainboard side of side plate, the pressure oscillation that the outlet of side plate lateral lobe wheel closely is close to is relaxed.Like this, the gas stream that is extracted into outlet side by impeller is difficult to be inhaled into once more from rotor shaft direction side plate one side of impeller interior all sides of impeller, thereby, the rotating vortex that closely is close to generation at side plate just diminishes, thus, the BF value is diminished, it is big that the part that impeller can effectively be blown becomes, thereby improve gas fan efficient, noise also diminishes.

The impeller of the described centrifugal blower in the 3rd aspect of the present invention is, aspect the of the present invention the 1st or 2 in, described waveform shape is that triangle is wavy.

The impeller of the described centrifugal blower in the 4th aspect of the present invention is, aspect the of the present invention the 1st or 2 in, described waveform shape is a sinusoidal wave shape.

The impeller of the described centrifugal blower in the 5th aspect of the present invention is, aspect the of the present invention the 1st or 2 in, described waveform shape is that rectangle is wavy.

The impeller of the described centrifugal blower in the 6th aspect of the present invention is that in the either side of 1-5 of the present invention, the pitch of waves of described waveform shape is more than 2mm, in the following scope of 8mm; Wave height is more than the 1mm, the following scope of 5mm.

In the impeller according to the centrifugal blower of the either side of 3-6 of the present invention, waveform shape and size are specialized.

These waveform shapes are located at when all sides closely are close in the blade of side plate side one side of mainboard, improved the practicability of waveform shape, described waveform shape is used to destroy, dwindle the turbulent eddy that all sides closely are close in the blade that becomes the side plate side one side noise reason, that betide mainboard.And, when the mainboard side that these waveform shapes are located at side plate is simultaneously gone up, having improved the practicability of waveform shape, described waveform shape is used to dwindle the side plate that becomes the BF value and increase reason and closely is close to vortex.

The described centrifugal blower in the 7th aspect of the present invention comprises; As the described impeller of the present invention the 1st～6 either side; Make the rotating drive unit of mainboard; Have with side plate in all side opening portion's subtends and the intake grill put and be located at the impeller outer circumferential side, towards with rotating shaft roughly orthogonal direction send the air blowing opening of gas and cover the casing of impeller.

In above-mentioned centrifugal blower, if make the mainboard revolution with drive unit, the then relative casing revolution of impeller, at this moment, each blade of impeller is retracted to the outer circumferential side space with gas from interior all sides space, and the gas that is forced into the impeller outer circumferential side from intake grill is sent by air blowing opening.Just, centrifugal blower sucks gas from intake grill, sends gas from air blowing opening.

At this moment, owing to adopt the present invention the 1st～6 the described impeller of either side, the waveform shape that is shaped on the mainboard destroys, dwindles the turbulent eddy of gas stream to the collision and the generation of gas stream interflow of mainboard.Therefore, the noise that takes place during the impeller gas bleeding diminishes.

Again, by the waveform shape that is shaped on the side plate, the vortex that makes side plate closely be close to generation diminishes, and thus, the BF value is diminished, and effectively the blow part of work of impeller becomes big, thereby improves gas fan efficient, and noise also diminishes.

The simple declaration of accompanying drawing

Fig. 1 (a) is routine in the past multiblade blower side view (housing part is a sectional view).

Fig. 1 (b) is routine in the past multiblade blower side view, is that mainboard closely is close to noise genesis mechanism explanatory drawing (part impeller section diagrammatic sketch).

Fig. 1 (c) is routine in the past multiblade blower side view, is that side plate closely is close to noise genesis mechanism explanatory drawing (part impeller section diagrammatic sketch).

Fig. 2 is the impeller oblique drawing of multiblade blower of example in the past.

Fig. 3 is the impeller plan view of multiblade blower of example in the past.

Fig. 4 is the multiblade blower side view (housing part is a sectional view) of the 1st mode of execution.

Fig. 5 is the impeller side view (phantom) of the multiblade blower of the 1st mode of execution.

Fig. 6 is the impeller plan view of the multiblade blower of the 1st mode of execution.

Fig. 7 (a) is waveform shape (triangular waveform) expanded view.

Fig. 7 (b) is waveform shape (sinusoidal wave shape) expanded view.

Fig. 7 (c) is waveform shape (rectangle is a wavy) expanded view.

Fig. 8 (a) is the 1st mode of execution multiblade blower side view, and the noise of the waveform shape that is shaped on the mainboard reduces effect explanatory drawing (diagram part impeller section).

Fig. 8 (b) is the multiblade blower side view of the 1st mode of execution, and the noise of the waveform shape that is shaped on the side plate reduces the effect explanatory drawing.

Fig. 8 (c) is the multiblade blower side view of the 1st mode of execution, and the noise of mainboard upper blade spacer portion fluting shape reduces effect explanatory drawing (diagram part impeller section).

Fig. 9 is the paddle wheel plane sectional view of the turbine gas fan of the 2nd mode of execution.

Embodiment

The 1st mode of execution

(1) formation of multiblade blower

The multiblade blower of one embodiment of the present invention (centrifugal blower) is difference aspect following only: in the impeller 13 of Fig. 1～multiblade blower 10 of example in the past shown in Figure 3, interior all side edge parts of many pieces of blades closely are close to and have the concave-convex shape waveform shape on the mainboard 31, mainboard 31 sides at side plate 32 are formed with the concave-convex shape waveform shape, and gyratory directions the place ahead of one 35 has the grooving notch shape between many pieces of blades of mainboard 31.

Fig. 4 is the side view of the multiblade blower 40 of present embodiment, and Fig. 5 and Fig. 6 are the side view and the plan views of the impeller 43 of multiblade blower 40.

Multiblade blower 40 mainly is made of the motor 14 of impeller 63, the casing 11 that covers impeller 63, rotating impeller 43.

The many pieces of blades 33 of impeller 43 are fixed in circular plate type mainboard 61 outer periphery, and many pieces of blade 33 the other ends connect with ring-type side plate 62.Impeller 43 details aftermentioneds.

Form on the casing 11 gas air blowing opening 11a and by bellmouth 12 round intake grill 11b.The side plate 62 subtends configuration of intake grill 11b and impeller 43, flow into the gas in perimembranous space in the impeller 43 by this intake grill 11b, show along the form of impeller 43 rotating shaft O-O flowing into greatly, break away from rotating shaft O-O direction (impeller 43 peripheral direction) owing to impeller 43 revolutions flow to.Air blowing opening 11a is formed at the direction with intake grill 11b quadrature so that gas towards to impeller shaft O-O roughly orthogonal direction blow out.

The rotating shaft of motor 14 is contained on the center hole 61a (see figure 6) of mainboard 61, makes impeller 43 whole revolutions by making mainboard 61 revolutions.The body portion of motor 14 is fixed in casing 11.

Below, impeller 43 is described.

Impeller 43 is made of mainboard 61, many pieces of blades 33, ring-type side plates 62 as Fig. 5 and shown in Figure 6.In the present embodiment, this impeller 43 is to use mould with mainboard 61, many pieces of blades 33 and side plate 62 whole integrally formed resins.

Mainboard 61 is the circular plate type member that forms center hole 61a as shown in Figure 6, and the rotating shaft of motor 14 is fixed among the center hole 61a.

On mainboard 61 peripheries (limit) edge, equally spaced form many pieces of blades 33 described later along turning to.All side edge parts closely are close in these many pieces of blades 33, and cancavo-convex waveform shape 64 is shaped around interior all side edge parts.Here, described waveform shape 64 is 3mm for its pitch of waves P, and wave height H is the triangle of 2mm wavy (seeing Fig. 7 (a)).It is wavy that waveform shape is not limited to triangle, also shown in Fig. 7 (b) and Fig. 7 (c) sinusoidal wave wavy, rectangle is wavy.The waveform shape size is not limited to the size of present embodiment, so long as pitch of waves P more than 2mm, the following scope of 8mm, wave height H more than 1mm, the following scope of 5mm gets final product.

Again, portion 65 between the blade between the many pieces of blades 33 of mainboard 61 slots in gyratory directions the place ahead.Portion 65 thickness in a circumferential direction is also big than the thickness on blade 33 circumferencial directions between these many blades, and its slotting length does not arrive at the gyratory directions rear of another blade 33 of its gyratory directions the place ahead adjacency.Portion 65 radially slots all side edge parts in its slotting length is arrived at by the periphery side edge part between blade along blade 33 shapes.

Blade 33 has concave in gyratory directions the place ahead, is to be the member that a plurality of configurations of ring-type are done at the center with rotating shaft O-O.Blade 33 1 ends are fixed in mainboard 61 outer periphery, and from here along the distortionless prolongation of rotating shaft O-O, blade 33 the other ends such as Fig. 5 and shown in Figure 6 connect with ring-type side plate 62.

Ring-type side plate 62 is disposed at blade 33 the other end outer circumferential sides, connects each blade 33.Side plate 62 also can be simultaneously integrally formed with mainboard 61 and many pieces of blades 33.And mainboard 61 sides of side plate 62 simultaneously go up the cancavo-convex waveform shape 66 that is shaped.Here, waveform shape 66 is the same with the waveform shape 64 of mainboard 61, is that pitch of waves P is that 3mm, wave height H are the triangle wavy (seeing Fig. 7 (a)) of 2mm.In addition, it is wavy that waveform shape is not limited to triangle, shown in Fig. 7 (b) and Fig. 7 (c), is that sinusoidal wave shape, rectangle are wavy also.Be not limited to the size of present embodiment about the waveform shape size, also can be, pitch of waves P be the scope that 2mm is above, 8mm is above; Wave height H is the scope that 1mm is above, 5mm is following.

(2) action of multiblade blower

If motor 14 revolutions make multiblade blower 40 work, impeller 43 relative casings 11 turn round towards the R that turns to shown in Figure 6.Promptly, in the multiblade blower 40, mainly by the face gas bleeding that turns to the place ahead that forms blade 33 concave surfaces, thus, along with the blade 33 of impeller 43 in the impeller 43 all sides spaces to the gas bleeding of outer circumferential side space, suck gas from intake grill 11b all sides space in impeller 43, the gas that is retracted to impeller 43 outer circumferential sides concentrates on air blowing opening 11a and blows out (the gas stream Z that sees Fig. 4).Just, multiblade blower 40 with the form inspiration gas along rotating shaft O-O, and is sent gas through air blowing opening 11a to rotating shaft O-O orthogonal direction from intake grill 11b.In addition, only represent the gas stream Z on rotating shaft O-O right side among Fig. 4, and in rotating shaft O-O left side, the gas that is extracted into impeller 13 outer circumferential sides then flows to air blowing opening 11a along casing 11, blows out through it.

(3) transportation of impeller

During impeller 43 transportations, many impellers 43 are loaded by rotating shaft O-O direction.

Here, portion 65 slots as described above like that between the blade of the mainboard 61 of the impeller 43 of present embodiment, and its circumferential thickness is greater than the circumferential thickness of blade 33, and again, its radial length is the curved shape along blade 33, all side edge parts in being arrived at by the periphery side edge part of blade.Utilize this shape, two impellers 43 are overlapped from rotating shaft O-O direction, the blade 33 of correspondence that can another impeller 43 of setting-in on the fluting of one 65 between many blades of quadrate lope wheel 43.Two chimeric like this impellers 43 transport after can being loaded into the loading height of regulation.

(4) embodiment

The multiblade blower of the impeller that uses present embodiment is carried out the noise measuring result of experiment to be illustrated.

This experiment is carried out determination experiment to the gas fan of Fig. 2 and routine in the past gas fan shown in Figure 3, Fig. 5 and present embodiment shown in Figure 6.In addition, in the present embodiment, be purpose to reduce noise, the notch of 65 flutings is shaped simultaneously between the waveform shape 66 that is shaped on the waveform shape 64 that is shaped on the mainboard, the side plate 62, the blade of mainboard 61.Therefore,, prepare that each only possesses a kind of impeller of shape respectively in above-mentioned three kinds of shapes, carry out the noise measuring experiment for each the noise of confirming these three kinds of shapes reduces effect.The noise measuring experimental result is as follows:

1. only mainboard 61 is configured as the impeller of waveform shape 64 and compares with example in the past, and level of noise reduces 0.8dB.

2. only side plate 62 is configured as the impeller of waveform shape 66, compares with example in the past, and level of noise reduces 0.5dB.

3. only between the blade on the mainboard 61 portion 65 have the impeller of fluting shape and compare with example in the past, level of noise reduces 0.5dB.

Can confirm from above result, use in the present embodiment with noise and be reduced to arbitrary shape in three kinds of shapes of purpose, all can reduce level of noise.

(5) characteristics of multiple-blade multi fan

The multiblade blower of present embodiment has following feature.

1. reduce noise by the waveform shape that is shaped on the impeller mainboard.

In the multiblade blower 10 of example in the past, have to result from the noise of the turbulent eddy that mainboard 31 closely is close to, concrete genesis mechanism is as follows.

In impeller 13 inside, shown in Fig. 1 (b), like that,, closely be close at mainboard 31 from the part of intake grill 11b suction gas, collide the back towards periphery side flow (seeing gas stream X) with mainboard 31.Take place among this gas stream X mainboard 31 is collided the turbulent eddy that causes.This turbulent eddy is along with gas stream X flows to peripheral direction, once more with the gas stream interflow of colliding mainboard 31.And the turbulent eddy of gas stream X slowly develops, and all side edge parts form maximum turbulent eddy in blade 33, and it is extracted out to the periphery side direction by blade 33, produces noise.

On the other hand, in the impeller 43 of the multiblade blower 40 of present embodiment, because the interior all side edge parts at the blade at least 33 of side plate 62 sides of mainboard 61 one side closely are close to shaping concave-convex shape waveform shape 64, therefore, such shown in Fig. 8 (a), by the turbulent eddy of gas stream Z1, will arrive blade 33 before, broken and encircle, diminish the interflow development of the collision of mainboard 61 and gas stream.Therefore, the noise that takes place in the time of reducing blade 33 gas bleedings stream Z1.

2. reduce noise by the waveform shape that is shaped on the impeller side plate.

In routine in the past multiblade blower 10, it is the vortex at eddy current center that generation closely is close to side plate 32 outer circumference end.This vortex is helpless to the air-supply work of impeller 13, and the result becomes the reason of reduction of air-supply efficient and noise.Concrete genesis mechanism is as described below.

Like that, the part of gases in the casing 11 closely is close at side plate 32 and is produced vortex Y shown in Fig. 1 (c), after this vortex Y makes above-mentioned gas be pumped to impeller 13 peripheries, closely is close to from the bellmouth 12 of impeller 13 once more and is inhaled into all sides in the impeller 13.Therefore, in impeller 13, produce the axial length b of vortex Y part to the ratio b/B of the entire axial length B of impeller 13 (below be decided to be blockage factor BF) considerable part, the work of can not effectively blowing.Therefore, the air-supply inefficiency produces noise.

In the impeller 43 of the multiblade blower 40 of present embodiment, the cancavo-convex waveform shape 66 because mainboard 61 sides of side plate simultaneously are shaped, the pressure oscillation that makes impeller 43 outlets of side plate 62 closely be close to obtains relaxing.So shown in Fig. 8 (b), the gas stream that is retracted to outlet side by impeller 43 becomes and is difficult to be drawn onto all sides in the impeller 43 once more from the rotor shaft direction side plate side of impeller 43, the vortex Z2 that side plate 62 closely is close to generation diminishes.Thereby BF value b1/B1 diminishes, and can effectively the blow part of work of impeller 43 becomes big, so can improve gas fan efficient, noise also diminishes.

3. the fluting by portion between the mainboard blade of impeller reduces noise

In the impeller 43 of the multiblade blower 40 of present embodiment, be positioned at that one 65 slots in gyratory directions the place ahead at least between the blade of 33 in many pieces of blades of mainboard 61, so it is such shown in Fig. 8 (c), by the turbulent eddy of gas stream Z3 to mainboard 61 collisions and the development of gas stream interflow, before will being extracted out by blade 33, its part is axially escaped in the outside to mainboard 61 from portion 65 between the blade of fluting.Therefore, same with the waveform shape that is shaped on the mainboard 61 shown in Fig. 8 (a), the noise that takes place in the time of can reducing blade 33 gas bleedings stream.

And, portion 65 between the blade of the impeller 43 of present embodiment, the circumferencial direction top fluting in gyratory directions the place ahead of its mainboard 61, fluting does not arrive at the gyratory directions rear of portion 65 between blade.Thereby, can not increase the peeling off of gas stream at the gyratory directions rear of portion 65 between blade.Can not damage the effect of the reduction noise that produces at gyratory directions the place ahead fluting by portion between blade 65.

In addition, portion 65 between the blade of the impeller 43 of present embodiment, to interior all side edge part flutings, the turbulent eddy of gas stream Z3 was escaped from portion between the blade of fluting 65 before flowing to blade 33 periphery side edge parts easily from blade 33 periphery side edge parts.This can reduce the turbulent eddy that arrives blade 33 periphery side edge parts more, makes noise little.

Efficiency of loading when 4. impeller transports improves

In the portion 65, slot as previously mentioned between the blade of the mainboard 61 of the impeller 43 of present embodiment, its circumferential lengths is bigger than blade 33 circumferential thickness, and radial length is all side edge parts in 33 periphery side edge parts reach along the bending blade shape from blade.Utilize this shape, two impellers 43 can be overlapping by rotating shaft O-O direction, can embed each self-corresponding blade 33 on the notch of portion 65 between many blades, the efficiency of loading when improving impeller 43 thus and loading.

The 2nd mode of execution

Present embodiment is that the present invention is used for occasion on the impeller of turbine gas fan.That is the mode of execution when, the waveform shape that is shaped on the mainboard 61 of the multiblade blower 40 of aforementioned embodiments being applied on the impeller 73 of turbine gas fan.

Fig. 9 is the section plan of the turbine air feeder vane wheel 73 of present embodiment.

Impeller 73 is fixed with many pieces of blades 93 in the outer periphery of discoideus mainboard 91, and the other end of described many pieces of blades 93 connects with not shown retaining ring (side plate).

Be equally spaced to form many pieces of blades 93 on the gyratory directions on mainboard 91 outer periphery.Closely be close to the concave-convex shape waveform shape 94 that is shaped around interior all side edge parts at interior all side edge parts of these many pieces of blades 93.Here waveform shape 94 is the same with aforementioned embodiments, has the triangle shown in Fig. 7 (a)～Fig. 7 (c) wavy, and sinusoidal wave shape or rectangle are wavy, and pitch of waves P is the scope that 2mm is above, 8mm is following, and wave height H is that 1mm is above, the following scope of 5mm.

Even in the present embodiment, also same with aforementioned embodiments, on the face of the retaining ring side of mainboard 91, at least all side edge parts closely are close in blade 93, be formed with cancavo-convex waveform shape 94, thereby mainboard 91 is collided and the turbulent eddy of gas stream interflow development is destroyed before will flowing to blade 93, diminish, thereby the noise of generation can reduce blade 93 gas bleedings stream the time by gas stream.

Other mode of execution

In aforementioned embodiments, be to apply the present invention to adopt on the centrifugal blower of resin system impeller, but the present invention also is applicable to the centrifugal blower of the sheet metal system of employing impeller.

Utilize possibility on the industry

Utilize the present invention, can reduce the noise of the impeller of centrifugal blower.

Claims

1. the impeller of a centrifugal blower (43,73), it possesses with rotating shaft (O-O) is the mainboard (61,91) of center rotation; With described rotating shaft (O-O) be the configuration of center ring-type, an end is fixed in the many pieces of blades (33,93) of described mainboard (61,91) separately; Connect the ring-type side plate (62) of described many pieces of blades (33, the 93) the other end, it is characterized in that, closely be close to place's shaping concave-convex shape waveform shape (64,94) in side plate (62) side interior all side portion of many pieces of blades (33,93) at least simultaneously of mainboard (61,91).

2. the impeller of a centrifugal blower (43), it possesses with rotating shaft (O-O) is the mainboard (61) of center rotation; With described rotating shaft (O-O) be the configuration of center ring-type, an end is fixed in the many pieces of blades (33) of described mainboard (61,91) separately; Connect the ring-type side plate (62) of described many pieces of blades (33) the other end, it is characterized in that, shaping concave-convex shape waveform shape (66) on the face of mainboard (61) side of described side plate (62).

3. the impeller of centrifugal blower as claimed in claim 1 or 2 (43,73) is characterized in that, described waveform shape (64,66,94) is a triangular waveform.

4. the impeller of centrifugal blower as claimed in claim 1 or 2 (43,73) is characterized in that, described waveform shape (64,66,94) is a sinusoidal waveform.

5. the impeller of centrifugal blower as claimed in claim 1 or 2 (43,73) is characterized in that, described waveform shape (64,66,94) is a square waveform.

6. as arbitrary impeller (43,73) that requires described centrifugal blower in the claim 1～5, it is characterized in that described waveform shape (64,66,94) is, the pitch of waves is more than the 2mm, the scope that 8mm is following, and wave height is more than the 1mm, the scope that 5mm is following.

7. a centrifugal blower is characterized in that, possesses arbitrary driving means (14) that requires described impeller (43,73) also to possess to make described mainboard (61,91) to rotate in the claim 1～6; Have with described side plate (62) in the intake grill (11b) of all side openings portion subtend, be located at described impeller (43,73) outer circumferential side, with gas towards with described rotating shaft (O-O) casing (11) air blowing opening (11a), that cover described impeller (43,73) sent of orthogonal direction slightly.