CN203670271U

CN203670271U - Impeller of centrifugal fan

Info

Publication number: CN203670271U
Application number: CN201320779032.7U
Authority: CN
Inventors: 梁之博; 胡承杰; 任树栋; 李斌; 茅忠群; 诸永定
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2013-11-30
Filing date: 2013-11-30
Publication date: 2014-06-25
Anticipated expiration: 2023-11-30

Abstract

The utility model discloses an impeller of a centrifugal fan. The impeller comprises a front ring and a rear ring, and a plurality of blades are fixed between the front ring and the rear ring. The impeller is characterized in that the outlet end of each blade is in a waved saw tooth shape formed by a plurality of saw teeth. The outlet end (tail edge) of each blade is in the waved saw tooth shape, the falling position of wake vortices of the tail edge of each blade is changed, the distance between vorticity centers is increased, disturbance of falling wake vortices on wake flowing is restrained, and pneumatic noise caused by non-steady pressure fluctuation and wake vortices on the surfaces of the blades is reduced. The height and width of the saw teeth are limited, noise is further lowered, and the influence of the saw teeth on descending of pressure and air volume of the fan is reduced.

Description

A kind of impeller of centrifugal blower

Technical field

The utility model relates to a kind of centrifugal blower, especially a kind of impeller of centrifugal blower.

Background technique

Range hood has become one of machine for kitchen use equipment indispensable in Modern Family, and range hood comprises exhaust fume collecting hood, is positioned at the flow blower casing on exhaust fume collecting hood conventionally, and the centrifugal blower of the motor that comprises spiral case, impeller and drives impeller is installed in flow blower casing.

And the impeller of at present conventional centrifugal blower is circular arc plate prismatic blade, as the two-sided uniform air intake blower fan system of the application number disclosed a kind of kitchen ventilator of Chinese patent application that is 200810059095.9, comprise main frame, impeller and blower fan, impeller comprises circle, centre circle, foundation ring and blade; The disclosed a kind of impeller with central disc structure of Chinese patent that and for example the applicant's application number is 201120024842.2, has front and rear ring, is fixed with blade and mid-game between front and rear ring.

Above-mentioned this impeller adopts prismatic blade, and employing acceleration leaf road, leaf road, and blower fan is in operation process, and under the small flow high-speed working condition especially using user, impeller outlet easily forms " jet-wake " phenomenon, causes noise to strengthen.

Model utility content

Technical problem to be solved in the utility model is the problem existing for above-mentioned prior art, and a kind of impeller of the centrifugal blower that reduces noise is provided.

The utility model solves the problems of the technologies described above adopted technological scheme: a kind of impeller of centrifugal blower, comprise front and rear ring, between described front and rear ring, be fixed with multiple blades, it is characterized in that, the outlet end of described blade is by multiple zigzag fashion waviness flexuoses.

In a preferred embodiment of the present utility model, the height of described sawtooth is h, width is t, 0.5mm<h<3mm, 0.1<h/t<0.6, further reduce thus noise, can also reduce the impact of the decline of the pressure of sawtooth on blower fan and air quantity.

For making full use of space, impeller both sides, improve the air output of blower fan, between described front and rear ring, be also provided with mid-game.

In order further to reduce noise, reduce the impact of sawtooth on blower pressure and air quantity decline, described blade is forward and backward two sections in mid-game punishment, and blade back segment is a near the starting point of the sawtooth of rear circle to the distance of rear circle, and the end of the sawtooth of close mid-game is b to the distance of mid-game; Blade leading portion is also a near the starting point of the sawtooth of front circle to the distance of front circle, and the end of the sawtooth of close mid-game is b to the distance of mid-game, 0<a<t, 0<b<t; Or in the time that blower fan is single air intake, the starting point of sawtooth and the distance of front circle near front circle are a, the end of sawtooth and the distance of rear circle near rear circle are b, 0<a<t, 0<b<t.

Compared with prior art, the utility model has the advantage of: be arranged to the jagged structure of waveform at blade exit end (trailing edge), change the position of blade trailing edge tail vortex shedding, thereby increase the distance between center of vorticity, suppress the disturbance of Shedding Vortex to wake, and then reduced the non-steady pressure pulsation of blade surface and the aerodynamic noise that tail whirlpool causes.Height and the width of restriction sawtooth, further reduced noise, can also reduce the impact of the decline of the pressure of sawtooth on blower fan and air quantity.

Accompanying drawing explanation

Fig. 1 is first embodiment's of impeller of the present utility model perspective view;

Fig. 2 is first embodiment's of impeller of the present utility model sectional view;

Fig. 3 is the perspective view of blade of the present utility model;

Fig. 4 is first embodiment's of blade of the present utility model deployed condition projecting edge schematic diagram;

Fig. 5 is second embodiment's of impeller of the present utility model perspective view;

Fig. 6 is second embodiment's of blade of the present utility model deployed condition projecting edge schematic diagram.

Embodiment

Below in conjunction with accompanying drawing, embodiment is described in further detail the utility model.

Embodiment one

Referring to Fig. 1 and Fig. 2, a kind of impeller of centrifugal blower, comprises front circle 1 and rear circle 2, is fixed with multiple blades 3 between front circle 1 and rear circle 2, and blade 3 is fixed together with the riveting method of existing routine with front circle 1, rear circle 2.Between front circle 1 and rear circle 2, be also provided with mid-game 4, can form thus the structure of two-way air intake.

Referring to Fig. 3, the outlet end 31 of blade 3 (towards the trailing edge in impeller outside) undulate flexuose; Referring to Fig. 4, the outlet end 31 of blade 3 includes multiple sawtooth 311, sawtooth 311 is arranged along the length bearing of trend of blade 3, the height of each sawtooth 311 is h, and width is t, preferred, 0.5mm<h<3mm, 0.1<h/t<0.6, preferred, h/t=0.25.

Blade 3 is forward and backward two sections in mid-game 4 punishment, the starting point of first sawtooth 311 (near the sawtooth of rear circle 2) of blade 3 back segments is a to the distance of rear circle 2, and the end of last sawtooth 311 (near the sawtooth of mid-game 4) of back segment is b to the distance of mid-game 4; Same, the starting point of first sawtooth 311 (near the sawtooth of front circle 1) of blade 3 leading portions is a to the distance of front circle 1, the end of last sawtooth 311 (near the sawtooth of mid-game 4) of leading portion is b to the distance of mid-game 4.Preferably, 0<a<t, 0<b<t.

Embodiment two

Referring to Fig. 5, the present embodiment and embodiment's one difference is, centrifugal blower is single air intake, mid-game is no longer set, and now, the starting point of first sawtooth 311 (near the sawtooth of front circle 1) and the distance of front circle 1 are a, the end of last sawtooth 311 (near the sawtooth of rear circle 2) and the distance of rear circle 2 are b, preferably, 0<a<t, 0<b<t.

Claims

1. the impeller of a centrifugal blower, comprise front circle (1) and rear circle (2), between described front circle (1) and rear circle (2), be fixed with multiple blades (3), it is characterized in that, the outlet end (31) of described blade (3) forms waveform flexuose by multiple sawtooth (311).

2. impeller as claimed in claim 1, is characterized in that, the height of described sawtooth (311) is h, and width is t, 0.5mm<h<3mm, 0.1<h/t<0.6.

3. impeller as claimed in claim 2, is characterized in that, between described front circle (1) and rear circle (2), is also provided with mid-game (4).

4. impeller as claimed in claim 3, it is characterized in that, described blade (3) is forward and backward two sections in mid-game (4) punishment, blade (3) back segment is a near the starting point of the sawtooth of rear circle (1) to the distance of rear circle (2), and the end of the sawtooth of close mid-game (4) is b to the distance of mid-game (4); Blade (3) leading portion is also a near the starting point of the sawtooth of front circle (1) to the distance of front circle (1), the end of the sawtooth of close mid-game (4) is b to the distance of mid-game (4), 0<a<t, 0<b<t.

5. impeller as claimed in claim 2, it is characterized in that, the starting point of sawtooth and the distance of Qian Quan (1) near front circle (1) are a, the end of sawtooth and the distance of Hou Quan (2) near rear circle (2) are b, 0<a<t, 0<b<t.