CN1844759A

CN1844759A - Fan volute structure with air inlets on double sides for European-style smoke exhaust ventilator

Info

Publication number: CN1844759A
Application number: CNA2006100506409A
Authority: CN
Inventors: 茅忠群
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2006-04-30
Filing date: 2006-04-30
Publication date: 2006-10-11
Anticipated expiration: 2026-04-30
Also published as: CN100371645C

Abstract

The invention discloses a wind engine volute of Europe-type kitchen ventilator, which can adsorb wind via two surfaces. Wherein, the edge of front cover plate (1) is formed by a straight line (AB), several arcs (BC, CD, DE, EF, FG, GH), a straight line (GH), several arcs (HJ, JK) and straight lines (KL, LA); the edge of back cover plate (2) is formed by a straight line (A'B'), several arcs (B'C, C'D', D'E', E'F', F'G, G'H'), a straight line (GH'), several arcs (H'J', J'K') and straight lines (K'L', L'A'); the ratio between the radius of edge (JK) at the volute tongue of front cover plate (1) and the edge radius of edge (J'K') at the volute tongue of back cover plate (2) is 8-18.5. Compared to present technique, the invention has different curves at the edges of front and back cover plats, to control the separation of airflow when passes through the volute to confirm high efficiency, and reduce the rotary noise.

Description

The blower volute structure of European range hood that can be double-faced ventilated

Technical field

The present invention relates to a kind of component structural of range hood, the blower volute structure of the European range hood that particularly a kind of energy is double-faced ventilated.

Background technology

Now, range hood has become one of requisite machine for kitchen use equipment of average family, and at present, European-style range hood because of have outward appearance neatly lightly, the advantage such as little that takes up room, be subjected to increasing consumer's favor.European-style range hood generally comprises the range hood case, is positioned at the motor of volute of blower, impeller and the drives impeller of blower hood also perpendicular on the case, blower hood, wherein volute of blower comprises front shroud, back shroud and is connected the two ring-type middle casing, have air inlet on the front shroud, back shroud is provided with motor, and impeller is promptly between forward and backward cover plate.And the difference of European-style range hood and traditional lampblack absorber maximum is: air inlet is positioned at the side of volute of blower, it is the single side face air intake, its incoming air area is less, the mist extractor amount is not very desirable, therefore, some can be invented by double-faced ventilated volute of blower, as the patent No. is a kind of scheme the Chinese utility model patent " two air-inlet range hood " of ZL200420082377.8 (notification number is CN2729555Y) just provides, it is preceding, all have air inlet on the back shroud, oil smoke promptly on the air inlet from the front shroud and the back shroud gap between motor and the air inlet enter volute of blower.

Simultaneously, the blower fan of range hood adopts centrifugal blower more, and always there is noise in it when real work, and noise is generally from two aspects, and the one, the noise of blower fan itself, the 2nd, the noise that air-flow moves and sends because of turbulization in volute of blower.At present, occurred many at reducing the denoising structure design that noise source is made, and in noise reduction technology, a kind of in addition " active noise reduction " principle, promptly form artificially one identical with noise source amplitude size but new sound source that phase place is opposite offsets former noise, yet through spectrum analysis, the noise of range hood is one all has the continuous spectrum of suitable intensity in the scope of 20Khz at 6.3Hz, therefore to offset fully and be difficult to accomplish, but will accomplish that part offsets or possible.For this reason, " a kind of blower volute structure of top-sucking kitchen ventilator " of our ZL01132056.7 of Chinese invention patent formerly (notification number is CN1140703C) just provides a kind of design of active noise reduction, the ring-type middle casing that it comprises upper shell, lower house and is connected the two, upper shell and lower house are dissymmetrical structure, at snail tongue place, the radius of curvature of lower house edge contour is 5: 29.1 with the ratio of the radius of curvature of upper shell edge contour, and the middle casing at this place then is connected both with the warp surface of continuously smooth transition.This volute of blower is its design of different curvature radius of shell rim profile up and down at snail tongue place, can not be applicable to the volute of blower of European range hood fully, and for the volute of blower of the double-faced ventilated European range hood of energy, this radius of curvature need redesign.

Summary of the invention

Technical problem to be solved by this invention provides a kind of utilization " active noise reduction " principle and effectively reduces the European-style range hood noise, makes the blower volute structure of the double-faced ventilated European range hood of the also improved energy of blast, air quantity simultaneously.

The present invention solves the problems of the technologies described above the technical scheme that is adopted: the blower volute structure of the European range hood that this energy is double-faced ventilated, comprise front shroud, back shroud and be connected the two ring-type middle casing, all have air inlet on described front shroud and the back shroud, and described front shroud and back shroud are dissymmetrical structure at snail tongue place, the middle casing at this place then is connected both with the warp surface of continuously smooth transition, it is characterized in that:

1. the edge contour of front shroud is made up of the first straight line AB, the first circular arc BC, the second circular arc C D, three-arc DE, the 4th circular arc EF, the 5th circular arc FG, the second straight line GH, the 6th circular arc HJ, the 7th circular arc JK and the 3rd straight line KL of tangent and rounding off successively and the 4th straight line LA that is connected end points at the whole story;

2. the edge contour of back shroud is made up of first straight line A ' B ', first circular arc B ' C ', second circular arc C ' D ', three-arc D ' E ', the 4th circular arc E ' F ', the 5th circular arc F ' G ', second straight line G ' H ', the 6th circular arc H ' J ', the 7th circular arc J ' K ' and the 3rd straight line K ' L ' of tangent and rounding off successively and the 4th straight line L ' A ' of being connected end points at the whole story;

Wherein, on the edge contour of front shroud have an A, B, C, D, E, F, J, K, L respectively with the back shroud edge contour on the institute have an A ', B ', C ', D ', E ', F ', J ', K ', L ' corresponding one by one;

3. front shroud is 8: 18.5 with back shroud at the ratio of the radius of curvature of the edge contour J ' K ' at snail tongue place in the radius of curvature of the edge contour JK at snail tongue place.

For the edge contour that makes forward and backward cover plate slick and sly more, thereby effectively prevented the separation of air-flow, can do following improvement:

1. the 6th circular arc HJ on the described front shroud, the 5th circular arc FG, the 4th circular arc EF, three-arc DE, the second circular arc C D, the first circular arc BC is respectively with six different some o, a, b, c, d, e is the radius of curvature initial point, the ratio Ro of six radius of curvature: Ra: Rb: Rc: Rd: Re is 140: 145.5: 189.71: 167.5: 185.5: 261.35, and back five radius of curvature initial point a, b, c, d, e is respectively with respect to the coordinate of origin of coordinates o: a (9,-9.34), b (37.3,-9.44), c (13,-9.34), d (13,8.66), e (64.47,15.44);

2. the 6th circular arc H ' J ' on the described back shroud, the 5th circular arc F ' G ', the 4th circular arc E ' F ', three-arc D ' E ', second circular arc C ' D ', first circular arc B ' C ' is respectively with six different some o, a, b, c, d, e is the radius of curvature initial point, the ratio Ro ' of six radius of curvature: Ra ': Rb ': Rc ': Rd ': Re ' is 136: 145.5: 189.71: 167.5: 185.5: 261.35, and back five radius of curvature initial point a ', b ', c ', d ', e ' is respectively with respect to the coordinate of origin of coordinates o ': a ' (9,-9.34), b ' (37.3,-9.44), c ' (13,-9.34), d ' (13,8.66), e ' (64.47,15.44).

Compared with prior art, the present invention adopts conventional centrifugal blower fan log spiral method or four circular arc inequilateral basic circle methods, but at the distinguished and admirable inhomogeneities that distributes in the pressure field of the circumferential diverse location of spiral case in this type of centrifugal fan course of work, before this spiral case, the back shroud boundary curve is significantly different, wherein, front shroud edge contour (not comprising the snail tongue) has five camber lines and two and cuts straight line and constitute, back shroud edge contour (not comprising the snail tongue) has six camber lines and two and cuts straight line and constitute, prove through contrast test repeatedly, the design can control the separation of air-flow in the spiral case process of flowing through effectively, air-flow is little along the loss of journey static pressure, has guaranteed that blower fan reaches higher efficient;

And, in the design of snail tongue, snail tongue radius from front shroud backward cover plate strengthen continuously, form a taper seat, the increasing tongue body bus along with snail tongue radius also produces the inclination angle with respect to axis before and after the spiral case simultaneously, the harmonious wave sound radiation of fundamental frequency noise that the impeller blade of can decaying becomes to produce owing to pressure fluctuation when changeing through the snail tongue, can significantly weaken Rotation Noise, to reducing noise decibel numerical value bigger contribution is arranged, the contrast experiment proves, but the noise reduction decibels is greater than 1.5dB (A);

Simultaneously, double-faced ventilated advantage before and after having kept has also that volume is little, air quantity is big (greater than 163m ³/ min), the advantage of blast height (greater than 320), noise low (being not more than 54 (A)), can satisfy the good requirement of combination property that Chinese kitchen environment heavy wool is greasy, Gao Zhiyan proposes range hood preferably.

Description of drawings

Fig. 1 is the application state schematic diagram of the embodiment of the invention;

Fig. 2 is the cutaway view of Fig. 1;

Fig. 3 is the perspective view of the embodiment of the invention;

Fig. 4 is the front view of the embodiment of the invention;

Fig. 5 is the rearview of the embodiment of the invention;

Fig. 6 is the edge contour figure that the front shroud of spiral case launches projection;

Fig. 7 is the edge contour figure that the back shroud of spiral case launches projection.

The specific embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

As Fig. 1～shown in Figure 5, the blower volute structure of the European range hood that this energy is double-faced ventilated, comprise front shroud 1, back shroud 2 and be connected the two ring-type middle casing 3, all have air inlet 11,21 on described front shroud 1 and the back shroud 2, and described front shroud 1 is dissymmetrical structure with back shroud 2 at snail tongue place, and the middle casing 3 at this place then is connected both with the warp surface of continuously smooth transition; The state of the practical application of this blower volute structure, referring to Fig. 1 and Fig. 2,4 is blower hood, 5 is the impeller between front shroud 1, back shroud 2, the motor 6 of drives impeller 5;

As shown in Figure 6 and Figure 7,1. the edge contour of front shroud 1 is made up of the first straight line AB, the first circular arc BC, the second circular arc C D, three-arc DE, the 4th circular arc EF, the 5th circular arc FG, the second straight line GH, the 6th circular arc HJ, the 7th circular arc JK and the 3rd straight line KL of tangent and rounding off successively and the 4th straight line LA that is connected end points at the whole story;

2. the edge contour of back shroud 2 is made up of first straight line A ' B ', first circular arc B ' C ', second circular arc C ' D ', three-arc D ' E ', the 4th circular arc E ' F ', the 5th circular arc F ' G ', second straight line G ' H ', the 6th circular arc H ' J ', the 7th circular arc J ' K ' and the 3rd straight line K ' L ' of tangent and rounding off successively and the 4th straight line L ' A ' of being connected end points at the whole story;

Be on the edge contour of front shroud 1 have an A, B, C, D, E, F, J, K, L respectively with back shroud 2 edge contours on institute have an A ', B ', C ', D ', E ', F ', J ', K ', L ' corresponding one by one;

3. front shroud 1 is in the radius of curvature and the ratio R1 of back shroud 2 in the radius of curvature of the edge contour J ' K ' at snail tongue place of the edge contour JK at snail tongue place: R2 is 8: 18.5.

4. the 6th circular arc HJ on the described front shroud 1, the 5th circular arc FG, the 4th circular arc EF, three-arc DE, the second circular arc C D, the first circular arc BC is respectively with six different some o, a, b, c, d, e is the radius of curvature initial point, the ratio of six radius of curvature is Ro: Ra: Rb: Rc: Rd: Re is 140: 145.5: 189.71: 167.5: 185.5: 261.35, and back five radius of curvature initial point a, b, c, d, e is respectively with respect to the coordinate of origin of coordinates o: a (9,-9.34), b (37.3,-9.44), c (13,-9.34), d (13,8.66), e (64.47,15.44);

5. the 6th circular arc H ' J ' on the described back shroud 2, the 5th circular arc F ' G ', the 4th circular arc E ' F ', three-arc D ' E ', second circular arc C ' D ', first circular arc B ' C ' is respectively with six different some o, a, b, c, d, e is the radius of curvature initial point, the ratio of six radius of curvature is Ro ': Ra ': Rb ': Rc ': Rd ': Re ' is 136: 145.5: 189.71: 167.5: 185.5: 261.35, and back five radius of curvature initial point a ', b ', c ', d ', e ' is respectively with respect to the coordinate of origin of coordinates o ': a ' (9,-9.34), b ' (37.3,-9.44), c ' (13,-9.34), d ' (13,8.66), e ' (64.47,15.44).

Claims

1, the blower volute structure of the double-faced ventilated European range hood of a kind of energy, comprise front shroud (1), back shroud (2) and be connected the two ring-type middle casing (3), all have air inlet (11,21) on described front shroud (1) and the back shroud (2), and described front shroud (1) is dissymmetrical structure with back shroud (2) at snail tongue place, the middle casing at this place (3) then is connected both with the warp surface of continuously smooth transition, it is characterized in that:

1. the edge contour of front shroud (1) is made up of first straight line (AB), first circular arc (BC), second circular arc (CD), three-arc (DE), the 4th circular arc (EF), the 5th circular arc (FG), second straight line (GH), the 6th circular arc (HJ), the 7th circular arc (JK) and the 3rd straight line (KL) of tangent and rounding off successively and the 4th straight line (LA) that is connected end points at the whole story;

2. the edge contour of back shroud (2) is made up of first straight line (A ' B '), first circular arc (B ' C '), second circular arc (C ＇ D '), three-arc (D ' E '), the 4th circular arc (E ＇ F ＇), the 5th circular arc (F ' G '), second straight line (G ' H '), the 6th circular arc (H ' J '), the 7th circular arc (J ' K ') and the 3rd straight line (K ' L ') of tangent and rounding off successively and the 4th straight line (L ＇ A ＇) that is connected end points at the whole story;

Wherein, on front shroud (1) edge contour have a few (A, B, C, D, E, F, J, K, L) respectively with back shroud (2) edge contour on have a few (A ', B ', C ', D ', E ', F ', J ', K ', L ＇) corresponding one by one;

3. front shroud (1) is at the radius of curvature of the edge contour (JK) at snail tongue place and back shroud (2) ratio (R1: R2) be 8: 18.5 in the radius of curvature of the edge contour (JK ') at snail tongue place.

2, the blower volute structure of the double-faced ventilated European range hood of energy according to claim 1 is characterized in that:

1. the 6th circular arc (HJ) on the described front shroud (1), the 5th circular arc (FG), the 4th circular arc (EF), three-arc (DE), second circular arc (CD), first circular arc (BC) is respectively with six different point (o, a, b, c, d, e) be the radius of curvature initial point, the ratio of six radius of curvature (Ro: Ra: Rb: Rc: Rd: Re) be 140: 145.5: 189.71: 167.5: 185.5: 261.35, and back five radius of curvature initial point (a, b, c, d, e) coordinate with respect to the origin of coordinates (o) is respectively: (9,-9.34), (37.3,-9.44), (13,-9.34), (13,8.66), (64.47,15.44);

2. the 6th circular arc (H ' J ') on the described back shroud (2), the 5th circular arc (F ' G '), the 4th circular arc (E ＇ F ＇), three-arc (D ' E '), second circular arc (C ' D '), first circular arc (B ' C ') respectively with six different points (o ', a ', b ', c ', d ', e ') is the radius of curvature initial point, the ratio of six radius of curvature (Ro ': Ra ': Rb ': Rc ': Rd ': Re ') be 136: 145.5: 189.71: 167.5: 185.5: 261.35, and back five radius of curvature initial points (a ', b ', c ', d ', e ') coordinate with respect to the origin of coordinates (o ＇) is respectively: (9,-9.34), (37.3,-9.44), (13,-9.34), (13,8.66), (64.47,15.44).