CN1348065A

CN1348065A - Blower volute structure of top-sucking kitchen ventilator

Info

Publication number: CN1348065A
Application number: CN 01132056
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: 2001-10-28
Filing date: 2001-10-28
Publication date: 2002-05-08
Anticipated expiration: 2021-10-28
Also published as: CN1140703C

Abstract

The blower volute structure of top-sucking kitchen ventilator includes upper casting, lower casing and the middle annular casing connecting the aforesaid casing through continuous and smooth transition, and features that the upper casing the lower casing has asymmetrical structure with the curvature radius of the lower casing edge at volute tongue being smaller than that of upper casing. The asymmetrical structure makes the airflow form one new noise source at volute tongue with continuous spectrum and the new noise can counteract partial original noise of the kitchen ventilator to reduce total noise and make it possible to install great power motor with great noise in kitchen ventilator.

Description

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

Technical field

The present invention 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 by this invention 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 present invention 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 invention 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 present invention utilizes 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 application state schematic representation of the embodiment of the invention.

Fig. 2 is the worm's eye view of the embodiment of the invention.

Fig. 3 is the front view of the embodiment of the invention.

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

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 present invention 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.