CN1651772A

CN1651772A - Fan Volute structure of ceiling fume exhaustor

Info

Publication number: CN1651772A
Application number: CN 200510049092
Authority: CN
Inventors: 茅忠群
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2005-02-08
Filing date: 2005-02-08
Publication date: 2005-08-10
Anticipated expiration: 2025-02-08
Also published as: CN100334359C

Abstract

The present invention relates to a spiral case structure of fan for ceiling-mounted kitchen ventilator. Said spiral case structure includes three portions of upper case body, intermediate case body and lower case body. Said invention also provides the concrete structure of the above-mentioned every portion and their connection mode. On the basis of active noise reduction said invented spiral case structure can effectively prevent separation of air flow, and can raise blast pressure and air volume.

Description

A kind of blower volute structure of top-sucking kitchen ventilator

Technical field

The present invention relates to the blower volute structure of a kind of component structural of range hood, particularly a kind of range hood.

Background technique

Now, range hood has become one of requisite kitchen fitting of ordinary family, wherein adopt the kitchen ventilator of centrifugal blower bigger with its relative suction, noise is lower and well received, in any case yet, noise still exists, noise is generally from two aspects, 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, existing various denoising structure all is based on the design that how to reduce noise source, 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 frequency 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 CNCN1140703C) provides a kind of like this design proposal of active noise reduction, the ring-type middle casing that it comprises upper shell, lower shell body and is connected the two, upper shell and lower shell body are dissymmetrical structure, at snail tongue place, the radius of curvature of described lower shell body 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 design proposal has been initiated the asymmetric design of snail tongue place upper and lower casing, thereby realizes active noise reduction, but this design proposal is not made optimal design to upper and lower casing as yet at other edge contours everywhere.

Summary of the invention

Technical problem to be solved by this invention is how to provide a kind of utilization " active noise reduction " principle effectively to reduce top sucking type kitchen ventilator noise, make the also improved blower volute structure of blast, air quantity simultaneously.

The present invention solves the problems of the technologies described above the technological scheme that is adopted: the blower volute structure of this top-sucking kitchen ventilator comprises upper shell, lower shell body and is connected the ring-type middle casing of the two, upper shell and lower shell body 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 lower shell body is made up of the first straight line AB, the first circular arc BC, the first logarithmic curve CD, the second logarithmic curve DEF, the second circular arc FG, the second straight line HJ of tangent and rounding off successively and the 3rd straight line JA that connects end points at the whole story;

2. the edge contour of upper shell is made up of first straight line A ' B ', first circular arc B ' C ', first logarithmic curve C ' D ', second logarithmic curve D ' E ', three-arc E ' H ', the second straight line H ' J ' of tangent and rounding off successively and the 3rd straight line J ' A ' of connecting end points at the whole story;

3. lower shell body is 6.5: 18.5 with upper shell at the ratio of the radius of curvature of the edge contour B ' H ' at snail tongue place in the radius of curvature of the edge contour FG at snail tongue place.

Compared with prior art, the present invention is on the basis that keeps former snail tongue place asymmetrical design, to upper and lower casing in the processing that is further optimized of other edge contour curves everywhere, adopted two sections logarithmic spirals smoothly to join and progressively amplification, thereby on the basis of noise reduction, also effectively prevented the separation of air-flow, made contribution for blast, air quantity index, also contained the new composition of subduing the fluid dynamic noise simultaneously, combination property is good.

Description of drawings

Description of drawings.

Fig. 1 is the application state schematic representation of the embodiment of the invention.

Fig. 2 is the perspective view of the embodiment of the invention.

Fig. 3 is the worm's eye view of the embodiment of the invention.

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

Fig. 5 is the plan view of the embodiment of the invention.

Fig. 6 is the front case of spiral case and the edge contour figure that rear case launches projection.

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 top-sucking kitchen ventilator comprises upper shell 1, lower shell body 3 and is connected the ring-type middle casing 2 of the two, wherein upper shell 1 is a dissymmetrical structure with lower shell body 3, at snail tongue place, the radius of curvature of lower shell body edge contour 31 is littler than the radius of curvature of upper shell edge contour 11, and the middle casing 21 at this place then is connected both with the warp surface of continuously smooth transition; 4 is blower fan among Fig. 1, and 5 is the range hood case, and 7 for driving the motor of blower fan 4;

As shown in Figure 6, the edge contour of lower shell body 1 is made up of the first straight line AB, the second straight line BC, the first circular arc C D, the first logarithmic curve DEF, the second logarithmic curve FG, the second circular arc GH, the 3rd straight line HJ of tangent and rounding off successively and the 4th straight line JA that connects end points at the whole story;

The edge contour of upper shell is made up of first straight line A ' B ', first circular arc B ' E ', first logarithmic curve D ' E ' F ', second logarithmic curve F ' G ', second circular arc G ' H ', the second straight line H ' J ' of tangent and rounding off successively and the 3rd straight line J ' A ' of connecting end points at the whole story;

Lower shell body 1 is 6.5: 18.5 with upper shell 3 at the ratio of the radius of curvature R 5 of the edge contour B ' E ' at snail tongue place in the radius of curvature R 1 of the edge contour CD at snail tongue place;

The described first logarithmic curve DEF, D ' E ' F and the second logarithmic curve FG, F ' G ' are the radius of curvature initial point with same point O all, and at joint F, F ' rounding off, ratio OD, OD ': OF, OF ': OG, the OG ' of the radius of curvature of section start D, D ', joint F, F ' and end of a period place G, G ' are 131: 155.5: 216.2;

The described second logarithmic curve FG, F ' G ' and the second circular arc GH, G ' H ' are at joint G, G ' rounding off, and joint G, G ' and ratio OG, OG ': OH, the OH ' of the radius of curvature of end of a period place H, H ' are 216.2: 193;

In addition, in the present embodiment, also has the upwardly extending air-supply tongue piece 6 of extending at described lower shell body 3 exhaust outlet places, referring to Fig. 3, extend tongue piece 6 of this air-supply roughly is 90 ° of angles with lower shell body 3, and sentence the arc section smooth transition at the angle of cut and connect, the radius of curvature of this connection arc section is 5: 6.5 with the ratio of the radius of curvature of lower shell body first circular arc C D in the edge contour at snail tongue place.

Claims

1, a kind of blower volute structure of top-sucking kitchen ventilator, comprise upper shell (1), lower shell body (3) and be connected the two ring-type middle casing (2), upper shell (1) is dissymmetrical structure with lower shell body (3) at snail tongue place, the middle casing at this place (2) then is connected both with the warp surface of continuously smooth transition, it is characterized in that:

1. the edge contour of lower shell body (1) is made up of first straight line (AB), second straight line (BC), first circular arc (CD), first logarithmic curve (DEF), second logarithmic curve (FG), second circular arc (GH), the 3rd straight line (HJ) of tangent and rounding off successively and the 4th straight line (JA) that connects end points at the whole story;

2. the edge contour of upper shell is made up of first straight line (A ' B '), first circular arc (B ' E '), first logarithmic curve (D ' E ' F '), second logarithmic curve (F ' G '), second circular arc (G ' H '), second straight line (H ' J ') of tangent and rounding off successively and the 3rd straight line (J ' A ') that connects end points at the whole story;

3. lower shell body (1) is 6.5: 18.5 with upper shell (3) at the ratio of the radius of curvature (R5) of the edge contour (B ' E ') at snail tongue place in the radius of curvature (R1) of the edge contour (CD) at snail tongue place.

2, the blower volute structure of top-sucking kitchen ventilator according to claim 1 is characterized in that:

1. described first logarithmic curve (DEF, D ' E ' F ') is the radius of curvature initial point with same point (O) all with second logarithmic curve (FG, F ' G '), and (F, F ') rounding off in the joint, the ratio (OD, OD ': OF, OF ': OG, OG ') of the radius of curvature of section start (D, D '), joint (F, F ') and end of a period place (G, G ') is 131: 155.5: 216.2;

2. described second logarithmic curve (FG, F ' G ') and second circular arc (GH, G ' H ') be (G, G ') rounding off in the joint, and joint (G, G ') is 216.2: 193 with the ratio (OG, OG ': OH, OH ') of the radius of curvature of end of a period place (H, H ').

3, the blower volute structure of top-sucking kitchen ventilator according to claim 1 and 2, it is characterized in that also having the upwardly extending air-supply tongue piece (6) of extending at described lower shell body (3) exhaust outlet place, extend tongue piece (6) and lower shell body (3) of this air-supply roughly is 90 ° of angles, and sentences the arc section smooth transition at the angle of cut and connect.

4, the blower volute structure of top-sucking kitchen ventilator according to claim 3 is characterized in that the radius of curvature of described connection arc section and the ratio of lower shell body radius of curvature of first circular arc (CD) in the edge contour at snail tongue place are 5: 6.5.