CN205047518U - Centrifugal fan impeller and centrifugal fan - Google Patents

Abstract

The utility model aims at providing a centrifugal fan impeller, it is great mainly to solve the gap between current centrifugal fan impeller and the spiral case, problem that the volume loss is big. 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 utility model also provides an adopted aforementioned centrifugal fan impeller's centrifugal fan.

Description

Centrifugal blower fan blade wheel and centrifugal blower

Technical field

The utility model relates to blowing device field, is specifically related to a kind of centrifugal blower fan blade wheel, also relates to a kind of centrifugal blower.

Background technique

Centrifugal blower is the critical component in air-conditioning refrigeration system, its distinguishing feature is that impeller relative width is larger, air-flow flows into vertically, Radial Flow is transferred to gradually near hub disk, and there is certain gap at spiral case and impeller inlet, flow through air-flow herein, without blade acting, directly flow to volute outlet, there is a certain amount of energy loss (volumetric loss), gap is larger, and volumetric loss is larger, and this fraction is in spiral case, deposit large low velocity zone, upset flow field, form eddy current, direct relation blower fan overall performance is good and bad.

In addition, it is low that plastic centrifuge blower fan has cost of production, runs the advantage that noise is low and time processing is shaping, existing plastic centrifuge blower fan is subject to the restriction of material and assembly structure, bulk strength is poor, can only be applied to the air-conditioner set of little air quantity, low static pressure, for Wind Volume, the centrifugal blower of high static pressure, what all adopt is metal centrifugal blower, but metal centrifugal blower not only manufacturing cost is high, product noise is high, and the vane airfoil profile of processing complexity is restricted, inconvenience is produced.

Model utility content

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

Another object of the present utility model is to provide a kind of plastic centrifuge draught fan impeller that can promote bulk strength.

For reaching this object, the utility model by the following technical solutions:

Centrifugal blower fan blade wheel of the present utility model, comprise: wheel disc and the blade be arranged on wheel disc, described blade comprise for 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 be configured in the peripheral portion of side, periphery; Described the second end place is formed on the axial direction of impeller towards the bump that the direction away from described wheel disc extends.

Preferably, in aforesaid centrifugal blower fan blade wheel, described bump comprises tilting section, the inclined position of described tilting section from inner circumferential peripheral direction court away from described wheel disc.

Preferably, in aforesaid centrifugal blower fan blade wheel, described tilting section is clinoplain or inclination curved surface or its combination.

Preferably, in aforesaid centrifugal blower fan blade wheel, described bump comprises at least one section of described tilting section.

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

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

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

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

Preferably, in aforesaid centrifugal blower fan blade wheel, described tilting section is arranged in the inner side of the radial direction of described bump.

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

Another object of the present utility model is to provide a kind of employing can promote the centrifugal blower of plastic impeller intensity.

For reaching this object, the utility model by the following technical solutions:

A kind of centrifugal blower, comprise spiral case, also comprise aforesaid centrifugal blower fan blade wheel, described centrifugal blower fan blade wheel is arranged in described spiral case, and the described bump of the described the second end of described blade is arranged near the loudspeaker oral area of spiral case.

Preferably, in aforesaid centrifugal blower, described centrifugal blower fan blade wheel is configured to the outside being positioned at the radial direction of described loudspeaker oral area at least partially of described bump.

Preferably, in aforesaid centrifugal blower, described bump comprises the tilting section of the inner side being arranged on its radial direction, the inclined position of described tilting section from inner circumferential peripheral direction court away from described wheel disc, the outside being positioned at the radial direction of described loudspeaker oral area at least partially of described tilting section.

Preferably, in aforesaid centrifugal blower, the profile of described tilting section and described loudspeaker oral area is suitable.

The beneficial effects of the utility model are:

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

2, wheel disc, blade and/or blade ring are made of plastics, and metallic impeller of comparing can reduce cost of production, is convenient to production and processing.

3, blade ring adopts and thickeies design, effectively can promote the bulk strength of impeller, meet the demand of Wind Volume air-conditioner set, obtain the combination property of high strength, low cost, low noise.

Accompanying drawing explanation

By referring to the description of accompanying drawing to the utility model embodiment, above-mentioned and other objects, features and advantages of the present utility model will be more clear, in the accompanying drawings:

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

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

Fig. 3 a-3h is the schematic diagram of the different mode of execution of the blade of the utility model centrifugal blower fan blade wheel.

Fig. 4 is the structural representation of centrifugal blower of the present utility model.

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

Embodiment

Based on embodiment, the utility model is described below, but the utility model is not restricted to these embodiments.In hereafter details of the present utility model being described, detailedly describe some specific detail sections.Do not have the description of these detail sections can understand the utility model completely for a person skilled in the art yet.In order to avoid obscuring essence of the present utility model, known method, process, flow process, element do not describe in detail.

Axial direction X described in the utility model is the rotor shaft direction of impeller, and radial direction Y is the direction vertical with the rotor shaft direction of impeller, and inner circumferential is in radial directions near the position of rotating shaft, and periphery is in radial directions away from the position of rotating shaft.

Be introduced the concrete structure of centrifugal blower fan blade wheel of the present utility model shown in Fig. 1,2, in the following description, centrifugal blower fan blade wheel is referred to as impeller:

This impeller is so-called multiblade fan, and it comprises wheel disc 3 and arranges and the multiple blades 1 on wheel disc 3, and it becomes multiple blades 1 of slenderly being formed on the axial X of impeller relative to running shaft X radially and the drum configured at predetermined intervals.The first end 12 of described blade 1 is installed on the wheel disc 3 of circular, and the second end of blade 1 is provided with blade ring 2.Wheel disc 3 is provided with the shaft sleeve part 31 for being connected with the running shaft (not shown) of drive motor in central authorities, and under the driving of drive motor, impeller rotates around X-axis centered by running shaft.As preferred mode, the periphery of shaft sleeve part 31 is also provided with the strengthening rib 32 connecting rotating disk 3, and strengthening rib 32 can promote the bulk strength of shaft sleeve part 31 and rotating disk 3.What adopt in FIG is that wheel disc 3 is arranged in centre; the both sides of wheel disc all arrange the structure of blade 1; but the utility model is not limited to the structure in Fig. 1; other existing blade wheel structures; such as wheel disc is arranged on the sidepiece of impeller, and a side of wheel disc arranges the structure of blade 1 also in protection domain of the present utility model.In addition wheel disc is also not limited to the plane structure in Fig. 1, wheel disc can also be the bowl structure of the solid that center is protruded, the edge part of bowl structure is connected with blade, the radially inner side being centrally located at blade of bowl structure the (not shown) that is connected with motor shaft.

Wherein, the external frame of blade 1 comprise for the first end 12 that wheel disc 3 connects and the second end 11 away from wheel disc 3 relative with first end 12, and be configured in the inner edge portion 18 of inner circumferential side and be configured in the peripheral portion 19 of side, periphery; Described inner edge portion 18 meets at an inner edge acies with described the second end 11, and described peripheral portion 19 and described the second end 11 meet at outside acies.First end 12 and the second end 11 are connected between inner edge portion 18 and peripheral portion 19.The implication of meeting can be that two sides is intersected, and also can be seamlessly transit between two sides.The second end 11 connects inner edge acies 16 and outside acies 17, the second end 11 is formed on the axial direction X of impeller towards the bump that the direction away from described wheel disc 3 extends.Preferably, this bump is set to protrude towards the direction away from described wheel disc relative to the radial cross section of inner edge portion 18 position.

As one preferably mode of execution, bump is arranged near peripheral portion 19, make the bump of blade 1 can form the shape of closing with the matching form of the loudspeaker oral area 51 of spiral case 5 like this, when impeller is installed in spiral case 5, effectively can reduce air-flow and flow through gap between spiral case 5 and blade outward edge, and then reduce the volumetric loss of complete machine.

As one preferably mode of execution, bump comprises tilting section, and tilting section is set to from inner circumferential peripheral direction towards the inclined position away from described wheel disc 3.Tilting section inner circumferential circular arc and periphery circular arc are identical with periphery circular arc with the inner circumferential circular arc of blade 1 corresponding position respectively, and the tilt angle of its radial cross section is identical with impeller outlet angle.In order to coordinate with the loudspeaker oral area 51 of spiral case, preferably, tilting section is arranged on the inner side of the radial direction of bump.

Below in conjunction with accompanying drawing 3a-3h, the concrete shape of the second end 11 is further detailed.

Fig. 3 a is the first mode of execution of the second end 11, wherein, 18 is inner edge portion of blade 1, and 19 is peripheral portions of blade 1, inner edge portion 18 and the second end 11 are met at inner edge acies 16 place, meet in peripheral portion 19 and the second end 11 its outer edges end 17 place.The second end comprises radial extension 114 and a tilting section 113, and radial extension 114 extends from inner edge acies 16 to radial outside, and the other end connects one end of tilting section 113, and the other end of tilting section 113 connects outside acies 17.Tilting section 113 and peripheral portion 19 form bump jointly.Wherein tilting section 113 is clinoplains, and the angle between tilting section and radial direction is the scope of θ, θ can be 30 ° ~ 55 °, is preferably 45 °.

Fig. 3 b is the second mode of execution of the second end 11, and wherein the second end comprises radial extension 214 and a tilting section 213, and be with the first mode of execution difference, wherein tilting section 213 is inclination curved surfaces.Tilting section 213 and peripheral portion 19 form bump jointly.

Fig. 3 c is the third mode of execution of the second end 11, is with first and second mode of execution difference, and the second end is made up of a tilting section 313, and tilting section 313 one end connects inner edge acies 16, and the other end connects outside acies 17.Tilting section 313 and peripheral portion 19 form bump jointly.Wherein tilting section 313 is clinoplains, and the angle between tilting section and radial direction is the scope of θ, θ can be 30 ° ~ 55 °, is preferably 45 °.

Fig. 3 d is the 4th kind of mode of execution of the second end 11, and be with the 3rd mode of execution difference, the second end is made up of a tilting section 413, and wherein tilting section 413 is inclination curved surfaces.Tilting section 413 and peripheral portion 19 form bump jointly.

Fig. 3 e is the 5th kind of mode of execution of the second end 11, be with mode of execution one to four difference, the second end comprises two radial extension 515,514 and tilting sections 513, first radial extension 514 extends radially outward from inner edge acies 16 and is connected with one end of tilting section 513, the other end of tilting section 513 connects one end of the second radial extension 515, and the other end of the second radial extension 515 connects outside acies 17.The radial extension 515 of tilting section 513, second and peripheral portion 19 form bump jointly.Wherein tilting section 513 is clinoplains, and the angle between tilting section and radial direction is the scope of θ, θ can be 30 ° ~ 55 °, is preferably 45 °.

Fig. 3 f is the 6th kind of mode of execution of the second end 11, and the second end comprises two radial extension 615,614 and tilting sections 613, and tilting section 613 is connected between two radial extensions.The radial extension 615 of tilting section 613, second and peripheral portion 19 form bump jointly.Be with mode of execution five difference, wherein tilting section 613 is inclination curved surfaces.

Fig. 3 g is the 7th kind of mode of execution of the second end 11, the second end comprises radial extension 715 and a tilting section 713, radial extension 715 extends from outside acies 17 to radially inner side, and the other end connects one end of tilting section 713, and the other end of tilting section 713 connects inner edge acies 16.The radial extension 715 of tilting section 713, second and peripheral portion 19 form bump jointly.Wherein tilting section 713 is clinoplains, and the angle between tilting section and radial direction is the scope of θ, θ can be 30 ° ~ 55 °, is preferably 45 °.

Fig. 3 h is the 8th kind of mode of execution of the second end 11, the second end comprises radial extension 815 and a tilting section 813, radial extension 815 extends from outside acies 17 to radially inner side, and the other end connects one end of tilting section 813, and the other end of tilting section 813 connects inner edge acies 16.The radial extension 815 of tilting section 813, second and peripheral portion 19 form bump jointly.Be with the difference of mode of execution seven, wherein tilting section 813 is inclination curved surfaces.

Although describe 8 kinds of different mode of executions above, be of the present utility modelly not limited to above-mentioned eight kinds of modes.Such as: a tilting section is not limited to be independent clinoplain or inclination curved surface, can also be the combination of clinoplain and inclination curved surface.Again such as: when tilting section adopts clinoplain, clinoplain radial direction can have certain tilt angle relatively, also can extend vertically, and now bump forms the shape with right angle step.Again such as: the second end also can comprise at least two sections of tilting sections, directly can connect between tilting section, or by arranging radial extension or other linkage structures between tilting section, different tilting section intervals be arranged; Again such as: the slope of different tilting sections and/or curvature can be identical or different, or at least two sections of tilting sections adopt the mode of clinoplains and inclination surface composition.

As one preferably mode of execution, blade ring 2 is provided with near described outside acies 17 at the peripheral portion 19 of described blade 1, blade ring 2 in the form of a ring, itself and the coaxial setting of wheel disc 3, the inwall of blade ring 2 is connected with the peripheral portion 19 of blade 1 and is linked together one end away from wheel disc 3 of multiple blade 1, preferably, the sidepiece of blade ring 2 setting of aliging with outside acies 17.Blade ring 2 has certain thickness, the thickness d of preferred blade ring 2 is d=0.05D ~ 0.0714D, wherein D is impeller is external diameter, by the thickness of blade ring 2 is thickeied, can effectively increase blade wheel structure intensity, further reduce the gap at spiral case 5 and impeller inlet place simultaneously, and then reduce complete machine volumetric loss further, improve overall performance.

As one preferably mode of execution, described wheel disc 3, blade 1 and/or blade ring 2 are made of plastics.To compare metallic material, adopt plastic materials making wheel disc 3, blade 1 and/or blade ring 2 can effectively reduce the difficulty of cost of production and processing, also comparatively metallic material is more simple for the vane airfoil profile of the complexity of processing processing simultaneously, the requirement of Wind Volume air-conditioner set can be met, obtain the combination property of high strength, low cost, low noise.Such as: under the structure of same periphery size, compared with existing plastic impeller structure, impeller maximum equivalent of the present utility model is down to 6.74MPa by 10.45MPa, effectively reduces the equivalent stress of impeller, increase blade wheel structure intensity, expand the using scope of plastic fan.

Centrifugal fan structure of the present utility model is further detailed for the blade structure of embodiment one with Fig. 4,5 below.

Centrifugal blower comprises aforesaid impeller and spiral case 5, and impeller is arranged in spiral case 5, and spiral case has loudspeaker oral area 51, and loudspeaker oral area 51 is arranged on the sidewall 52 of spiral case 5 and extends, as the intake grill of centrifugal blower from sidewall 52 to the inner inclination of spiral case 5.After air-flow a is inhaled into from loudspeaker oral area 51, be divided into two groups of air-flow b and c, wherein air-flow b enters the inside of impeller and is sent through the exhaust outlet of spiral case after impeller acting; Air-flow c then causes volumetric loss by the gap between loudspeaker oral area 51 and impeller without impeller acting i.e. outflow.

In mounting point, the second end 11 of impeller is arranged near the loudspeaker oral area 51 of spiral case 5.Because the second end 11 at impeller is formed with bump, can be done work to the air-flow c entered from gap by bump when the second end 11 of impeller is arranged near the loudspeaker oral area 51 of spiral case 5, and then effectively reduce volumetric loss.

As one preferably mode of execution, described bump comprises the tilting section of the inner side being arranged on its radial direction, and the inclined position of tilting section from inner circumferential peripheral direction court away from described wheel disc 3, the outside being positioned at the radial direction of described loudspeaker oral area 51 at least partially of described tilting section, concrete, in the space entering into formation between loudspeaker oral area 51 and spiral case sidewall 52 at least partially of tilting section, as shown in Figure 5, the second end 11 of blade 1 comprises radial extension 114 and tilting section 113, radial extension 113 is arranged near loudspeaker oral area 51, in the space entering into formation between loudspeaker oral area 51 and spiral case sidewall 52 at least partially of outside acies 17 and extension 114, and be positioned at the outside of the radial direction of described loudspeaker oral area 51.Preferably, tilting section 113 is suitable, concrete with the profile of loudspeaker oral area 51, and angle of inclination or the curvature of the angle of inclination of tilting section 113 or curvature and loudspeaker oral area 51 are suitable, by all further reducing volumetric loss with upper type.

As one preferably mode of execution, as shown in Figure 4, impeller comprises a wheel disc 3 and is arranged in two groups of blades 1 of wheel disc 3 both sides, and the first end that spiral case 5 is equipped with loudspeaker oral area 51, two groups of blades 1 on two side matches with two loudspeaker oral areas 51 respectively.

Although Fig. 4,5 is described centrifugal blower of the present utility model for the blade of embodiment one, the structure that should not be construed as centrifugal blower of the present utility model is limited in the blade that can only adopt embodiment one.The blade of other structures adopting embodiment two to eight and meet the utility model thought is also all within protection domain of the present utility model.The structure of impeller is also not limited to and adopts the impeller shown in Fig. 4, meets the impeller of other structures of the utility model thought also all within protection domain of the present utility model.

In addition, it should be understood by one skilled in the art that the accompanying drawing provided at this is all for illustrative purposes, and accompanying drawing is not necessarily drawn in proportion.

Meanwhile, should be appreciated that example embodiment is provided, to make the disclosure be comprehensive, and its scope is fully conveyed to those skilled in the art.A lot of specific detail (such as the example of particular elements, equipment and method) is presented to provide thorough understanding of the disclosure.It will be apparent to one skilled in the art that and do not need to adopt specific detail, example embodiment can be implemented with much different forms, and example embodiment should not be understood to limit the scope of the present disclosure.In some example embodiments, well-known technique, well-known device structure and well-known technology are not described in detail.

Term is only for describing the object of particular example embodiment as used herein, is not intended for restrictive.As used herein, " one ", " one " and " described " of singulative also can be intended to comprise plural form, unless context explicitly points out to otherwise.Term " comprises ", " comprising ", " containing " and " having " are inclusive and therefore clearly state the existence of described feature, entirety, step, operation, element and/or parts, but does not get rid of and there is or increase one or more further feature, entirety, step, operation, element, parts and/or its combination.Method step described here, technique and operation will not be understood to inevitable requirement they with discussion or illustrative particular order be performed, the order unless expressly stated for performing.Also can adopt step that is other or that substitute by understanding.

When an element or layer be mentioned as another element or layer " on ", " being engaged to ", " being connected to " or " being coupled to " another element or layer time, its can directly on another element or layer, directly engaged, connected or be connected to another element or layer, or intermediary element or layer can be there is.By contrast, when an element be mentioned as " directly " another element or layer " on ", " being directly engaged to ", " being directly connected to " or " being directly coupled to " another element or layer time, intermediary element or layer can not be there is.Other word for describing relation between element should be explained in a similar manner (such as, " between " and " directly between ", " vicinity " and " being directly close to " etc.).As used herein, term "and/or" comprises arbitrary in the Listed Items of one or more association or all combines.

Although term first, second, third, etc. can be used to describe each element, parts, region, layer and/or section at this, these elements, parts, region, layer and/or section should not limited by these terms.These terms can only for distinguishing element, parts, region, layer or a section and another element, region, layer or section.The term of such as " first ", " second " and other numerical value term when not meaning that order or sequentially when this uses, unless context explicitly points out.Thus, the first element discussed below, parts, region, layer or section can be called as the second element, parts, region, layer or section, and do not deviate from the instruction of example embodiment.In addition, in description of the present utility model, except as otherwise noted, the implication of " multiple " is two or more.

For being easy to illustrate, such as " interior ", " outward ", " under ", " below ", " bottom ", " top ", " top " etc. space correlation term be used to the relation of an illustrative element or feature and another element or feature in description figure at this.Will be appreciated that space correlation term can be intended to comprise the equipment different orientation except the orientation described in figure in use or operation.Such as, if the equipment in figure is reversed, be then described as be in other element or feature " below " or " under " so element will be positioned in this other element or feature " top ".Thus, exemplary term " below " can comprise above and below both orientation.Equipment can otherwise be directed (90-degree rotation or be in other orientation), and space correlation descriptor should be interpreted accordingly as used herein.

The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, to those skilled in the art, the utility model can have various change and change.All do within spirit of the present utility model and principle any amendment, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.

Claims (13)

1. a centrifugal blower fan blade wheel, comprise: wheel disc (3) and the blade (1) be arranged on wheel disc (3), it is characterized in that: described blade (1) comprise for the first end (12) that wheel disc (3) connects and the second end away from wheel disc (3) relative with first end (12) (11), and be configured in the inner edge portion (18) of inner circumferential side and be configured in the peripheral portion (19) of side, periphery; Described the second end (11) place is formed at the upper bump extended towards the direction away from described wheel disc (3) of the axial direction (X) of impeller.

2. centrifugal blower fan blade wheel as claimed in claim 1, is characterized in that: described bump comprises tilting section (113,213,313,413,513,613,713,813), described tilting section (113,213,313,413,513,613,713,813) inclined position from inner circumferential peripheral direction court away from described wheel disc (3).

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

4. centrifugal blower fan blade wheel as claimed in claim 2, is characterized in that: described bump comprises at least one section of described tilting section (113,213,313,413,513,613,713,813).

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

6. centrifugal blower fan blade wheel as claimed in claim 4, is characterized in that: the end away from described wheel disc (3) (17) place of the peripheral portion (19) in described blade (1) is provided with blade ring (2).

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

8. centrifugal blower fan blade wheel as claimed in claim 6, is characterized in that: described wheel disc (3), blade (1) and/or blade ring (2) are made of plastics.

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

10. a centrifugal blower, comprise spiral case (5), it is characterized in that: also comprise centrifugal blower fan blade wheel as claimed in any one of claims 1-9 wherein, described centrifugal blower fan blade wheel is arranged in described spiral case (5), and the described bump of the described the second end (11) of described blade is arranged near the loudspeaker oral area (51) of spiral case (5).

11. centrifugal blowers as claimed in claim 10, is characterized in that: described centrifugal blower fan blade wheel is configured to the outside being positioned at the radial direction of described loudspeaker oral area (51) at least partially of described bump.

12. centrifugal blowers as claimed in claim 11, it is characterized in that: described bump (11) comprises the tilting section (113 of the inner side being arranged on its radial direction, 213,313,413,513,613,713,813), described tilting section (113,213,313,413,513,613,713,813) inclined position from inner circumferential peripheral direction court away from described wheel disc (3), the outside being positioned at the radial direction of described loudspeaker oral area (51) at least partially of described tilting section.

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