CN2502055Y

CN2502055Y - Fan volute structure for top-sucking type oil-fume exhauster

Info

Publication number: CN2502055Y
Application number: CN 01253661
Authority: CN
Inventors: 茅忠群; 陈安林; 田大钧; 刘训谦; 杨新铁; 胡欲立
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2001-09-12
Filing date: 2001-09-12
Publication date: 2002-07-24
Anticipated expiration: 2011-09-12

Abstract

The utility model relates to a fan volute structure for top sucking type oil fume exhauster, including an upper shell, a lower shell and a ring shape middle shell connecting the upper shell with the lower shell. The structures of the upper shell and the lower shell are in dissymmetry. At the volute tongue, the curvature radius of the curve at the edge of lower shell is shorter than the curvature radius of the upper shell. The middle shell connects the lower shell to the upper shell in a way of smoothly-transmitted twist surface at the volute tongue. At the volute tongue, that the optimum method is that the rate between the curvature radius of the curve at the edge of the lower shell and the curvature radius of the curve at the edge of the upper shell is 5 to 29.1. The difference from the prior art is that: a new noise resource is formed at the volute tongue where the upper shell and the lower shell are in dissymmetry; as that the different arcs at the volute tongue is constantly changed, the formed noise is also a constant frequency spectrum; the new noise can efficiently kill a part of the noise produced by the oil-fume exhauster to decrease the total noise. Arranging a motor with high power and louder noise on the oil fume exhauster is possible.

Description

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

Technical field

The utility model relates to the fan scroll 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.

Summary of the invention

Technical problem to be solved in the utility model is how to provide a kind of utilization " active noise reduction " principle to come, can effectively reduce the blower volute structure of suction top sucking type kitchen ventilator noise.

The utility model solves the problems of the technologies described above the technological scheme that is adopted: the blower volute structure of top-sucking kitchen ventilator comprises upper shell, lower shell body and is connected the ring-type middle casing of the two, it is characterized in that upper shell and lower shell body are dissymmetrical structure, radius of curvature at snail tongue place lower shell body boundary curve is littler than the radius of curvature of upper shell boundary curve, and the middle shell at this place then is connected both with the warp surface of continuously smooth transition.

At snail tongue place, the radius of curvature of described lower shell body boundary curve was good with the ratio of the radius of curvature of upper shell boundary curve with 5: 29.1; Be the best with following scheme wherein, promptly on developed projection, described lower shell body boundary curve is sentenced by circular arc AB, circular arc BC and circular arc C D rounding off at the snail tongue and is formed by connecting, and wherein the ratio of the radius of circular arc AB, BC, CD is 259.9: 5: 146; And described upper shell boundary curve is sentenced straight line AE, circular arc EF and logarithmic spiral FD rounding off is formed by connecting at the snail tongue, and wherein the radius of circular arc EF is 29.1: 5 with the ratio of the radius of circular arc BC; Especially, described upper shell has a tortuosity along the snail tongue and extends upward a tongue piece at the exhaust outlet place, can further reduce noise, this tongue piece is good with an arc plate, and with radian be 90 °, radius with upper shell the ratio of the radius of curvature of the boundary curve at snail tongue place be 22: 29.1 be the best.

Compared with prior art, the asymmetrical design of lower shell body at snail tongue place that go up of the present utility model makes air-flow produce a new noise source at this place, and because the different radians at tongue place, whirlpool are continually varyings, therefore formed noise also is a continuous frequency spectrum, these new noises can be offset the original noise of a part of range hood effectively, thereby total noise is descended, and the setting of the overhanging tongue piece of upper shell can be flowed out air-flow more swimmingly from the spiral case outlet, can reduce eddy current further, thereby noise is further reduced at this place.Because the utility model is to utilize the principle of " active noise reduction " that total noise is reduced, and therefore just the bigger heavy-duty motor of original noise might be installed on range hood, thereby improve the lampblack absorbing efficient of this machine.

Description of drawings

Description of drawings.

Fig. 1 is the utility model embodiment's an application state schematic representation.

Fig. 2 is the utility model embodiment's a worm's eye view.

Fig. 3 is the utility model embodiment's a front view.

Fig. 4 is the utility model embodiment's a plan view.

Fig. 5 is the front case of spiral case and the boundary curve figure that rear case launches projection.

Embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

As Fig. 1～shown in Figure 4, 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 boundary curve 31 is littler than the radius of curvature of upper shell boundary curve 11, and the middle shell 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;

At snail tongue place, the radius of curvature of described lower shell body boundary curve 31 was good with the ratio of the radius of curvature of upper shell boundary curve 11 with 5: 29.1; Be the best wherein with as shown in Figure 5 scheme, promptly on developed projection, described lower shell body boundary curve 31 at snail tongue place is being formed by connecting by circular arc AB, circular arc BC and circular arc C D rounding off, and the ratio of their radius is R1: R2: R3=259.9: 5: 146; And described upper shell boundary curve 11 at snail tongue place is formed by connecting with straight line AE, circular arc EF and logarithmic spiral FD rounding off, and wherein the radius of circular arc EF is R4: R2=29.1 with the ratio of the radius of circular arc BC: 5

In addition, described upper shell 1 has a tortuosity along the snail tongue and extends upward a tongue piece 6 at the exhaust outlet place, referring to Fig. 1, Fig. 3, with further reduction noise, this tongue piece 6 is that 22: 29.1 and radian are that 90 ° arc plate is the best with the ratio of its radius and circular arc EF radius.

Claims

1, a kind of blower volute structure of top-sucking kitchen ventilator, comprise upper shell, lower shell body and be connected the two ring-type middle casing, it is characterized in that upper shell and lower shell body are dissymmetrical structure, radius of curvature at snail tongue place lower shell body boundary curve is littler than the radius of curvature of upper shell boundary curve, and the middle shell at this place then is connected both with the warp surface of continuously smooth transition.

2, the blower volute structure of top-sucking kitchen ventilator according to claim 1 is characterized in that, at snail tongue place, the radius of curvature of described lower shell body boundary curve is 5: 29.1 with the ratio of the radius of curvature of upper shell boundary curve.

3, the blower volute structure of top-sucking kitchen ventilator according to claim 2, it is characterized in that, on developed projection, described lower shell body boundary curve is sentenced by circular arc AB, circular arc BC and circular arc C D rounding off at the snail tongue and is formed by connecting, and the ratio of the radius of circular arc AB, BC, CD is 259.9: 5: 146; And described upper shell boundary curve is sentenced straight line AE, circular arc EF and logarithmic spiral FD rounding off is formed by connecting at the snail tongue, and wherein the radius of circular arc EF is 29.1: 5 with the ratio of the radius of circular arc BC;

According to the blower volute structure of claim 1 or 2 or 3 described top-sucking kitchen ventilators, it is characterized in that 4, described upper shell has a tortuosity along the snail tongue and extends upward a tongue piece at the exhaust outlet place.

5, the blower volute structure of top-sucking kitchen ventilator according to claim 4 is characterized in that described tongue piece is an arc plate.

6, the blower volute structure of top-sucking kitchen ventilator according to claim 5 is characterized in that described circular arc tongue piece is 90 ° of radians, and its radius is 22: 29.1 with upper shell at the ratio of the radius of curvature of the boundary curve at snail tongue place.