CN106593947A - Centrifugal fan impeller and centrifugal fan - Google Patents

Abstract

The invention aims to provide a centrifugal fan impeller, which mainly solves the problems of large gap and large volume loss between the existing centrifugal fan impeller and a volute. The method comprises the following steps: the blade comprises a first end part connected with the wheel disc, a second end part opposite to the first end part and far away from the wheel disc, an inner edge part configured on the inner periphery side and an outer edge part configured on the outer periphery side; the second end portion is formed with a projection extending in an axial direction of the impeller toward a direction away from the disk. Through setting up the bulge, can do work to the air current that flows through the gap, the effectual volume loss that has reduced. The invention also provides a centrifugal fan adopting the centrifugal fan impeller.

Description

Centrifugal blower fan blade wheel and centrifugal blower

Technical field

The present invention relates to blowing device field, and in particular to a kind of centrifugal blower fan blade wheel, a kind of centrifugal blower is further related to.

Background technology

Centrifugal blower is the critical component in air-conditioning refrigeration system, and its distinguishing feature is that impeller relative width is larger, gas Stream is flowing axially into, and gradually switchs to Radial Flow near hub disk, and spiral case and impeller inlet exist it is certain between Gap, flows through air-flow herein, does work without blade, flows directly into volute outlet, there is a certain amount of energy and damages Lose (volumetric loss), gap is bigger, and volumetric loss is bigger, and this fraction is in spiral case, to deposit big low speed Area, upsets flow field, forms vortex, and direct relation blower fan overall performance is good and bad.

Additionally, plastic centrifuge blower fan has low production cost, the advantage that noise is low and is processed and formed at one time is run, it is existing Some plastic centrifuge blower fans by material and assembling structure limited, bulk strength is poor, can be only applied to little air quantity, The air-conditioner set of low static pressure, for Wind Volume, the centrifugal blower of high static pressure, all uses metal centrifugal blower, But not only manufacturing cost is high for metal centrifugal blower, product high noise, and it is limited to process complicated vane airfoil profile System, inconvenience production.

The content of the invention

In view of this, the present invention provides a kind of centrifugal blower fan blade wheel that can effectively reduce volumetric loss.

Another object of the present invention is to provide a kind of plastic centrifuge draught fan impeller for being possible to lift bulk strength.

It is that, up to this purpose, the present invention is employed the following technical solutions：

The centrifugal blower fan blade wheel of the present invention, including：Wheel disc and the blade being arranged on wheel disc, the blade includes using In with the first end that wheel disc connects and the second end away from wheel disc relative with first end, and be configured in The inner edge portion of inner circumferential side and the peripheral portion for being configured in periphery side；It is formed with impeller at the second end Axial direction on towards away from the wheel disc direction extend protuberance.

Preferably, in aforesaid centrifugal blower fan blade wheel, the protuberance includes tilting section, and the tilting section is from interior Circumferential peripheral direction is inclined towards the position away from the wheel disc.

Preferably, in aforesaid centrifugal blower fan blade wheel, the tilting section be clinoplain or incline curved surface or its Combination.

Preferably, in aforesaid centrifugal blower fan blade wheel, the protuberance includes at least one section tilting section.

Preferably, in aforesaid centrifugal blower fan blade wheel, the tilting section is arranged near the peripheral portion.

Preferably, in aforesaid centrifugal blower fan blade wheel, the peripheral portion of the blade away from the wheel disc end Blade ring is provided with portion.

Preferably, in aforesaid centrifugal blower fan blade wheel, the thickness d of the blade ring is d=0.05D～0.0714D, It is external diameter that wherein D is impeller.

Preferably, in aforesaid centrifugal blower fan blade wheel, the wheel disc, blade and/or blade ring are made of plastics.

Preferably, in aforesaid centrifugal blower fan blade wheel, the tilting section is arranged in the interior of the radial direction of the protuberance Side.

Another object of the present invention is to provide a kind of centrifugal blower that can effectively reduce volumetric loss.

Another object of the present invention is to providing a kind of employing can lift the centrifugal blower of plastic impeller intensity.

It is that, up to this purpose, the present invention is employed the following technical solutions：

A kind of centrifugal blower, including spiral case, also including aforesaid centrifugal blower fan blade wheel, the centrifugal blower fan blade wheel sets Put in the spiral case, and cause the blade the second end the protuberance near spiral case horn mouth Portion is arranged.

Preferably, in aforesaid centrifugal blower, the centrifugal blower fan blade wheel is configured to the protuberance at least A part is positioned at the outside of the radial direction of the loudspeaker oral area.

Preferably, in aforesaid centrifugal blower, the protuberance includes the tilting section of the inner side for being arranged on its radial direction, The tilting section is inclined from inner circumferential peripheral direction towards the position away from the wheel disc, at least one of the tilting section Divide the outside of the radial direction positioned at the loudspeaker oral area.

Preferably, in aforesaid centrifugal blower, the tilting section is adapted with the profile of the loudspeaker oral area.

The invention has the beneficial effects as follows：

1st, the impeller of the centrifugal blower can effectively reduce the volumetric loss of centrifugal blower.

2nd, wheel disc, blade and/or blade ring are made of plastics, and the metallic impeller that compares can reduce production cost, just In production and processing.

3rd, blade ring can effectively lift the bulk strength of impeller using design is thickeied, and meet Wind Volume air-conditioner set Demand, obtain the combination property of high intensity, low cost, low noise.

Description of the drawings

By referring to the drawings to the description of the embodiment of the present invention, above-mentioned and other purposes, the feature of the present invention Will be apparent from advantage, in the accompanying drawings：

Fig. 1 is the sectional perspective structural representation of the centrifugal blower fan blade wheel of the present invention；

Fig. 2 is the side view of the centrifugal blower fan blade wheel of the present invention.

Fig. 3 a-3h are the schematic diagrames of the different embodiment of the blade of centrifugal blower fan blade wheel of the present invention.

Fig. 4 is the structural representation of the centrifugal blower of the present invention.

Fig. 5 is the enlarged drawing of part A in Fig. 4.

Specific embodiment

Below based on embodiment, present invention is described, but the present invention is not restricted to these embodiments. Hereafter to the present invention detailed description in, it is detailed to describe some specific detail sections.To those skilled in the art For the description of part without these details can also completely understand the present invention.In order to avoid obscuring the essence of the present invention, The not narration in detail of known method, process, flow process, element.

Heretofore described axial direction X is the rotor shaft direction of impeller, and radial direction Y is the rotating shaft side with impeller To vertical direction, inner circumferential is in radial directions that near the position of rotating shaft, periphery is in radial directions away from turning The position of axle.

To be introduced to the concrete structure of the centrifugal blower fan blade wheel of the present invention shown in Fig. 1,2, in following description In, centrifugal blower fan blade wheel is referred to as impeller：

The impeller is so-called multiblade fan, and it includes wheel disc 3 and arranges and the multiple blades 1 on wheel disc 3, It is radial and to advise relative to rotary shaft X that it becomes multiple blades 1 for slenderly being formed on the axial X of impeller The drum of fixed interval configuration.The first end 12 of the blade 1 is installed on the wheel disc 3 of circular, The second end of blade 1 is provided with blade ring 2.Wheel disc 3 is provided with for (scheming with the rotary shaft of drive motor in central authorities Not shown in) shaft sleeve part 31 that is connected, under the driving of drive motor, impeller is centered on rotary shaft around X-axis Rotated.Used as preferred mode, the periphery of shaft sleeve part 31 is additionally provided with the ribs 32 of connection rotating disk 3, plus Strong rib 32 can lift the bulk strength of shaft sleeve part 31 and rotating disk 3.Use in FIG during wheel disc 3 is arranged in Between, the both sides of wheel disc are respectively provided with the structure of blade 1, but the present invention is not limited to the structure in Fig. 1, and other have Blade wheel structure, such as wheel disc is arranged on the sidepiece of impeller, and the one side of wheel disc arranges the structure of blade 1 also at this In the protection domain of invention.In addition wheel disc is also not necessarily limited to the planar structure in Fig. 1, and wheel disc can also be that center is protruded Three-dimensional bowl structure, the edge part of bowl structure is connected with blade, and bowl structure is centrally located at blade Radially inner side and the (not shown) that is connected with motor shaft.

Wherein, the outline of blade 1 includes the first end 12 and and first end for being connected with wheel disc 3 The 12 relative the second ends 11 away from wheel disc 3, and be configured in the inner edge portion 18 of inner circumferential side and be configured in The peripheral portion 19 of periphery side；The inner edge portion 18 meets at an inner edge acies with the second end 11, The peripheral portion 19 meets at outside acies with the second end 11.First end 12 and the second end 11 It is connected between inner edge portion 18 and peripheral portion 19.Meet and be meant that it can is that two sides is intersected, also may be used Being seamlessly transitted between two sides.The connection inner edge of the second end 11 acies 16 and outside acies 17, in the second end The protuberance for towards direction away from the wheel disc 3 extending is formed with the axial direction X of impeller on 11.Preferably, The protuberance is arranged to be protruded towards the direction away from the wheel disc relative to the radial section of the position of inner edge portion 18.

Used as a kind of preferably embodiment, protuberance is arranged near peripheral portion 19, so that blade 1 Protuberance can form the shape closed with the matching form of the loudspeaker oral area 51 of spiral case 5, when impeller is installed to spiral case When in 5, the gap that air-flow is flow through between spiral case 5 and blade outward flange can be effectively reduced, and then reduce whole machine Volumetric loss.

Used as a kind of preferably embodiment, protuberance includes tilting section, and tilting section is arranged to from inner circumferential periphery Direction inclines towards the position away from the wheel disc 3.Tilting section inner circumferential circular arc is corresponding with blade 1 respectively with periphery circular arc The inner circumferential circular arc of position is identical with periphery circular arc, and the inclination angle of its radial section is identical with impeller outlet angle.In order to The loudspeaker oral area 51 of spiral case coordinates, it is preferred that tilting section is arranged on the inner side of the radial direction of protuberance.

Below in conjunction with the accompanying drawings 3a-3h to the concrete shape of the second end 11 being further detailed.

Fig. 3 a are the first embodiments of the second end 11, wherein, 18 is the inner edge portion of blade 1,19 It is the peripheral portion of blade 1, inner edge portion 18 is met with the second end 11 at inner edge acies 16, peripheral portion 19 meet with the second end 11 at outer marginal end 17.The second end radially extends the inclination of section 114 and including one Section 113, radially extends section 114 and extends to radial outside from inner edge acies 16, other end connection tilting section 113 One end, tilting section 113 the other end connection outside acies 17.The common shape of tilting section 113 and peripheral portion 19 Into protuberance.Wherein tilting section 113 is clinoplain, and the angle between tilting section and radial direction is θ, θ's Scope can be 30 °～55 °, preferably 45 °.

Fig. 3 b are second embodiments of the second end 11, and wherein the second end radially extends section 214 including one With a tilting section 213, it is that wherein tilting section 213 is to incline curved surface with the first embodiment difference. Tilting section 213 and peripheral portion 19 are collectively forming protuberance.

Fig. 3 c are the third embodiments of the second end 11, are with first and second embodiment difference, The second end is made up of a tilting section 313, and the one end of tilting section 313 connects inner edge acies 16, and other end connection is outer Marginal end 17.Tilting section 313 and peripheral portion 19 are collectively forming protuberance.Wherein tilting section 313 is to incline to put down Face, the angle between tilting section and radial direction is θ, and the scope of θ can be 30 °～55 °, preferably 45 °.

Fig. 3 d are the 4th kind of embodiments of the second end 11, are with the 3rd embodiment difference, second End is made up of a tilting section 413, and wherein tilting section 413 is to incline curved surface.Tilting section 413 and peripheral portion 19 are collectively forming protuberance.

Fig. 3 e are the 5th kind of embodiments of the second end 11, are with the difference of embodiment one to four, the Two ends radially extend section 515,514 and a tilting section 513 including two, and first radially extends section 514 from inward flange End 16 extends radially outward and is connected with one end of tilting section 513, the other end connection second of tilting section 513 One end of section 515 is radially extended, second radially extends the other end connection outside acies 17 of section 515.Tilting section 513, Second radially extends section 515 and peripheral portion 19 is collectively forming protuberance.Wherein tilting section 513 is clinoplain, Angle between tilting section and radial direction is θ, and the scope of θ can be 30 °～55 °, preferably 45 °.

Fig. 3 f are the 6th kind of embodiments of the second end 11, and the second end radially extends section 615,614 including two With a tilting section 613, tilting section 613 is connected to two and radially extends between section.Tilting section 613, second radially extend Section 615 and peripheral portion 19 are collectively forming protuberance.It is with the difference of embodiment five, wherein tilting section 613 is to incline curved surface.

Fig. 3 g are the 7th kind of embodiments of the second end 11, and the second end radially extends section 715 and including one Tilting section 713, radially extends section 715 and extends to radially inner side from outside acies 17, other end connection tilting section 713 one end, the other end connection inner edge acies 16 of tilting section 713.Tilting section 713, second radially extend section 715 and peripheral portion 19 be collectively forming protuberance.Wherein tilting section 713 is clinoplain, tilting section and radial direction side Angle between is θ, and the scope of θ can be 30 °～55 °, preferably 45 °.

Fig. 3 h are the 8th kind of embodiments of the second end 11, and the second end radially extends section 815 and including one Tilting section 813, radially extends section 815 and extends to radially inner side from outside acies 17, other end connection tilting section 813 one end, the other end connection inner edge acies 16 of tilting section 813.Tilting section 813, second radially extend section 815 and peripheral portion 19 be collectively forming protuberance.It is with the difference of embodiment seven, wherein tilting section 813 It is to incline curved surface.

Although describing 8 kinds of different embodiments above, the present invention's is not limited to above-mentioned eight kinds of modes. For example：One tilting section is not limited to single clinoplain or inclines curved surface, can also be clinoplain and inclines The combination of skew surface.Again for example：When tilting section adopts clinoplain, clinoplain relatively radially can have in direction There is certain inclination angle, also can axially extend, now protuberance forms the shape with right angle step.Again for example： The second end may also include at least two sections tilting sections, can be directly connected between tilting section, or by tilting section it Between arrange and radially extend section or other attachment structures so that different tilting section interval setting；Again for example：Different The slope and/or curvature of tilting section can identical or difference, or at least two sections tilting sections are using clinoplain and inclination The mode of surface composition.

As a kind of preferably embodiment, in the peripheral portion 19 of the blade 1 near the outside acies 17 It is provided with blade ring 2, blade ring 2 is annular in shape, itself and the coaxial setting of wheel disc 3, inwall and the blade 1 of blade ring 2 Peripheral portion 19 be connected and one end away from wheel disc 3 of multiple blades 1 link together, it is preferred that leaf The setting that the sidepiece of loop 2 aligns with outside acies 17.Blade ring 2 has certain thickness, preferred blade ring 2 thickness d is d=0.05D～0.0714D, and it is external diameter that wherein D is impeller, by the way that the thickness of blade ring 2 is added Thickness, can effectively increase blade wheel structure intensity, while spiral case 5 and the gap at impeller inlet are further reduced, And then whole machine volumetric loss is further reduced, improve overall performance.

Used as a kind of preferably embodiment, the wheel disc 3, blade 1 and/or blade ring 2 are made of plastics. Compare metal material, and making wheel disc 3, blade 1 and/or blade ring 2 using plastic material can effectively reduce life The difficulty of cost and processing is produced, while the complicated vane airfoil profile of processing processing is also more simple compared with metal material, The requirement of Wind Volume air-conditioner set is disclosure satisfy that, the combination property of high intensity, low cost, low noise is obtained.For example： Under the structure of same periphery size, compared with existing plastic impeller structure, the impeller maximum equivalent of the present invention should Power is down to 6.74MPa by 10.45MPa, effectively reduces the equivalent stress of impeller, increases blade wheel structure intensity, Expand the use range of plastic fan.

Below traveling one is entered to the centrifugal fan structure of the present invention by taking the blade construction of embodiment one as an example by Fig. 4,5 The explanation of step.

Centrifugal blower includes aforesaid impeller and spiral case 5, and impeller is arranged in spiral case 5, and spiral case has loudspeaker oral area 51, loudspeaker oral area 51 is arranged on the side wall 52 of spiral case 5 and extends from side wall 52 to the inner inclination of spiral case 5, makees For the air inlet of centrifugal blower.After air-flow a is inhaled into from loudspeaker oral area 51, it is divided into two groups of air-flows b and c, its Middle air-flow b into impeller inside and Jing after impeller acting the air outlet of Jing spiral cases is sent；And air-flow c then passes through Do work to flow out without impeller and cause volumetric loss in gap between loudspeaker oral area 51 and impeller.

In installation site, the second end 11 of impeller is arranged near the loudspeaker oral area 51 of spiral case 5.Due in impeller The second end 11 be formed with protuberance, when the second end 11 of impeller is arranged near the loudspeaker oral area 51 of spiral case 5 When can by protuberance to from the gap into air-flow c do work, and then effectively reduce volumetric loss.

Used as a kind of preferably embodiment, the protuberance includes the tilting section of the inner side for being arranged on its radial direction, and And tilting section is inclined from inner circumferential peripheral direction towards the position away from the wheel disc 3, at least one of the tilting section Divide the outside of the radial direction positioned at the loudspeaker oral area 51, specifically, at least a portion of tilting section enters into loudspeaker In the space formed between oral area 51 and snail shell side wall 52, as shown in figure 5, the second end 11 of blade 1 is wrapped Include and radially extend section 114 and tilting section 113, radially extend section 113 and arrange near loudspeaker oral area 51, outside acies 17 and extension 114 at least a portion enter between loudspeaker oral area 51 and snail shell side wall 52 formed space in, And the outside of the radial direction positioned at the loudspeaker oral area 51.Preferably, tilting section 113 and loudspeaker oral area 51 Profile is adapted, specifically, the angle of inclination of the angle of inclination of tilting section 113 or curvature and loudspeaker oral area 51 or Curvature is adapted, by can further reduce volumetric loss with upper type.

As a kind of preferably embodiment, as shown in figure 4, impeller includes a wheel disc 3 and is arranged in wheel disc 3 Two groups of blades 1 of both sides, spiral case 5 is equipped with loudspeaker oral area 51, the first end of two groups of blades 1 on two side It is engaged with two loudspeaker oral areas 51 respectively.

Although Fig. 4,5 are that the centrifugal blower of the present invention is illustrated by taking the blade of embodiment one as an example, not The structure for being interpreted as the centrifugal blower of the present invention is limited in the blade that can only adopt embodiment one.Using embodiment Two to eight and meet inventive concept other structures blade also within protection scope of the present invention.Impeller Structure be also not limited to using the impeller shown in Fig. 4, the impeller for meeting the other structures of inventive concept also exists Within protection scope of the present invention.

Additionally, it should be understood by one skilled in the art that provided herein accompanying drawing is provided to descriptive purpose, And what accompanying drawing was not necessarily drawn to scale.

It will also be appreciated that example embodiment is provided, so that the disclosure is comprehensive, and its scope is abundant Convey to those skilled in the art.Many specific details (such as examples of particular elements, apparatus and method) are given Go out to provide thorough understanding of the disclosure.It will be apparent to one skilled in the art that specific detail need not be adopted, show Example embodiment can be carried out in many different forms, and example embodiment is understood not to limit the disclosure Scope.In some example embodiments, it is thus well known that technique, well-known device structure and many institute's weeks The technology known is not described in.

Term as used herein is only used for describing the purpose of particular example embodiment, is not intended to as restricted.Such as As used herein, " one " of singulative, " one " and " described " also may be intended to include plural form, unless context Explicitly point out otherwise.Term " including ", "comprising", " containing " and " having " are inclusive and therefore bright The presence of the feature, entirety, step, operation, element and/or part is really illustrated, but is not excluded the presence of or is increased Plus one or more further features, entirety, step, operation, element, part and/or its combination.It is described here Method and step, technique and operation will be not understood to inevitable requirement they with the particular order that discusses or illustrate held OK, order unless expressly stated to perform.It will also be appreciated that the step of other or replacement can be adopted.

When an element or layer be mentioned as another element or layer " on ", " being engaged to ", " being connected to " or " joined It is connected to " another element or during layer, it directly can be engaged on another element or layer, directly, it is another to be connected or coupled to One element or layer, or there may be intermediary element or layer.By contrast, when an element is mentioned as " direct " another One element or layer " on ", " being bonded directly to ", " being directly coupled to " or " being directly coupled to " another element or layer When, can not there is intermediary element or layer.For describe relation between element other words should in a similar manner by Explain (for example, " between " and " directly between ", " neighbouring " and " being directly adjacent to " etc.).As used herein, art Language "and/or" includes the arbitrary or all combinations in the Listed Items of one or more associations.

Although term first, second, third, etc. here can be used for describe each element, part, region, layer and/ Or section, but these elements, part, region, layer and/or section should not be limited by these terms.These arts Language can be only used for distinguishing element, part, region, layer or a section with another element, region, layer or section Open.Such as " first ", the term of " second " and other numerical value terms do not mean that when used herein order or order, Unless clearly indicated by the context.Thus, the first element discussed below, part, region, layer or section can be claimed For the second element, part, region, layer or section, without departing from the teaching of example embodiment.Additionally, at this In bright description, unless otherwise stated, " multiple " are meant that two or more.

For ease of explanation, such as " interior ", " outward ", " under ", " lower section ", " bottom ", " top ", " top " etc. Space correlation term here be used in description figure illustrate an element or feature and another element or the pass of feature System.It will be appreciated that space correlation term may be intended to comprising equipment in use or operation except the side described in figure Different orientation outside position.For example, if the equipment in figure is reversed, other elements or spy are described as be in Levy " lower section " or " under " element will then be positioned in other elements or feature " top ".Thus, example art Language " lower section " can include above and below both orientation.Equipment can otherwise be directed (be rotated by 90 ° or At other orientations), and space correlation descriptor as used herein should be interpreted accordingly.

The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for people in the art For member, the present invention can have various changes and change.It is all made within spirit and principles of the present invention it is any Modification, equivalent, improvement etc., should be included within the scope of the present invention.

Claims (13)

1. a kind of centrifugal blower fan blade wheel, including：Wheel disc (3) and the blade (1) being arranged on wheel disc (3), its It is characterised by：The blade (1) includes first end (12) and and the first end for being connected with wheel disc (3) The relative the second end (11) away from wheel disc (3) in portion (12), and the inner edge portion for being configured in inner circumferential side (18) and it is configured in the peripheral portion (19) of periphery side；The second end (11) place is formed with impeller Axial direction (X) on towards away from the wheel disc (3) direction extend protuberance.

2. centrifugal blower fan blade wheel as claimed in claim 1, it is characterised in that：The protuberance includes tilting section (113,213,313,413,513,613,713,813), the tilting section (113,213,313,413, 513,613,713,813) incline from inner circumferential peripheral direction towards the position away from the wheel disc (3).

3. centrifugal blower fan blade wheel as claimed in claim 2, it is characterised in that：The tilting section (113,213,313, 413,513,613,713,813) it is clinoplain or inclination curved surface or its combination.

4. centrifugal blower fan blade wheel as claimed in claim 2, it is characterised in that：The protuberance includes at least one section The tilting section (113,213,313,413,513,613,713,813).

5. centrifugal blower fan blade wheel as claimed in claim 2, it is characterised in that：The tilting section (113,213,313, 413,513,613,713,813) arrange near the peripheral portion (19).

6. centrifugal blower fan blade wheel as claimed in claim 4, it is characterised in that：In the outside of the blade (1) End (17) place away from the wheel disc (3) of edge (19) is provided with blade ring (2).

7. centrifugal blower fan blade wheel as described in claim 6, it is characterised in that：The thickness d of the blade ring is It is external diameter that d=0.05D～0.0714D, wherein D are impeller.

8. centrifugal blower fan blade wheel as claimed in claim 6, it is characterised in that：The wheel disc (3), blade (1) And/or blade ring (2) is made of plastics.

9. centrifugal blower fan blade wheel as claimed in claim 2, it is characterised in that：The tilting section (113,213,313, 413,513,613,713,813) it is arranged in the inner side of the radial direction of the protuberance.

10. a kind of centrifugal blower, including spiral case (5), it is characterised in that：Also include as appointed in claim 1-9 Centrifugal blower fan blade wheel described in one, the centrifugal blower fan blade wheel is arranged in the spiral case (5), and is caused described The protuberance of the second end (11) of blade is arranged near the loudspeaker oral area (51) of spiral case (5).

11. centrifugal blowers as claimed in claim 10, it is characterised in that：The centrifugal blower fan blade wheel is configured to At least a portion of the protuberance is located at the outside of the radial direction of the loudspeaker oral area (51).

12. centrifugal blowers as claimed in claim 11, it is characterised in that：The protuberance (11) is including setting The inner side of its radial direction tilting section (113,213,313,413,513,613,713,813), the inclination Section (113,213,313,413,513,613,713,813) is from inner circumferential peripheral direction towards away from the wheel The position of disk (3) inclines, and at least a portion of the tilting section is located at the radial direction of the loudspeaker oral area (51) Outside.

13. centrifugal blowers as claimed in claim 12, it is characterised in that：Tilting section (113,213,313,413, 513,613,713,813) it is adapted with the profile of the loudspeaker oral area (51).