CN201297278Y

CN201297278Y - Closed vane wheel with S-shaped novel vanes dedicated to small high-speed centrifugal fan

Info

Publication number: CN201297278Y
Application number: CNU2008200410078U
Authority: CN
Inventors: 吴晓龙
Original assignee: JIANGYIN CITY AGRICULTURE CHEMICAL EQUIPMENT FACTORY
Current assignee: JIANGYIN CITY AGRICULTURE CHEMICAL EQUIPMENT FACTORY
Priority date: 2008-07-10
Filing date: 2008-07-10
Publication date: 2009-08-26
Anticipated expiration: 2018-07-10

Abstract

The utility model relates to a closed vane wheel with S-shaped novel vanes dedicated to a small high-speed centrifugal fan, which comprises a rear wheel disc (2) and vanes (3); wherein, the vanes (3) are circumferentially, equidistantly and vertically assembled on the rear wheel disc (2) clockwise or counterclockwise; and the vane wheel is characterized in that the cross section of each vane (3) is similar to a S. When the vane wheel rotates at a high speed, the airflow in an air inlet arranged at the center of a front wheel disc first enters the large circular arcs, which are close to the center of the rear wheel disc, of the vanes, and then is slidingly transferred outwards to enter the small circular arcs, which are far from the center of the rear wheel disc, of the vanes, as a result, the kinetic pressure of the air is increased, the flow speed is increased, and the airflow is ejected out after passing through the flow channel of a fan shell. The utility model resolves the defect that the prior vane wheel with alternated long and short vanes can cause airflow interference to affect power, consequently, the efficiency of the fan is increased by over 5 percent, and the noise is reduced by over 3 decibels.

Description

The small-sized high speed centrifugal blower fan enclosed impeller of " S " type new blade

Technical field

The utility model relates to a kind of small-sized high speed centrifugal blower fan, especially relates to a kind of small-sized high speed centrifugal blower fan enclosed impeller.

Background technique

High-speed centrifugal fan commonly used at present, its matching used enclosed impeller mainly contains three kinds of structural types: front and back are to linear leaf, the alternate blade with length of antecurvature short blade.Resistance of air is bigger when rotated owing to linear leaf to the chip impeller that comes into leaves wherein, and pressure is lower, so power loss is bigger, and effect is low; The antecurvature short blade resistance of air of antecurvature short blade formula impeller is little, the pressure height.But because multiple relations such as flow velocity and small leaf vibration frequencies, power of fan has improved, but noise is that whistle cry is higher; The alternate blade impellers of length has changed the deficiency of above two kinds of impellers, but fan efficiency and noise reduction also fail to reach desirable effect.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned deficiency, provides an a kind of more step to improve effect and reduce the enclosed impeller of the small-sized high speed centrifugal blower fan of noise with " S " type new blade.

The purpose of this utility model is achieved in that the enclosed impeller of a kind of small-sized high speed centrifugal blower fan with " S " type new blade, comprise rear trochal disc and blade, described blade is vertically mounted on the described rear trochal disc clockwise or counterclockwise equally spacedly along circumference, it is characterized in that described leaf cross-section is similar to " S " type.

The utility model impeller intake grill air-flow of front-wheel disk center when high speed rotating at first enters the orthodrome part of blade near the rear trochal disc centre, outwards slide then and transmit the little circular arc portion that enters away from the rear trochal disc centre, air hydrodynamic increases, flow velocity strengthens, and air communication penetrates after crossing the Fan casing runner.The utility model has changed in the past that the alternate blade impellers of length has interference in air flow to influence the deficiency of power, thereby the efficient that has improved blower fan reduces noise more than 3 decibels more than 5%.

Description of drawings

Fig. 1 is the side structure schematic representation of the utility model small-sized high speed centrifugal blower fan with the enclosed impeller of " S " type new blade.

Fig. 2 unloads the left view behind the rear trochal disc among Fig. 1.

Fig. 3 is the partial enlarged drawing of Fig. 2.

Among the figure: preceding wheel disc 1, rear trochal disc 2, blade 3, intake grill 1.1, coupling 2.1.

Embodiment

Referring to Fig. 1～2, the small-sized high speed centrifugal blower fan that the utility model relates to mainly is made up of preceding wheel disc 1, rear trochal disc 2 and blade 3 with the enclosed impeller of " S " type new blade.

Described shroud 1 center is provided with intake grill 1.1;

Described rear trochal disc 2 central authorities are provided with the coupling 2.1 of a band keyway that is connected with power, or rear trochal disc central authorities be provided with a plurality of through holes directly and power section be fastenedly connected with screw;

Described blade 3 is vertically mounted on the described rear trochal disc 2 clockwise or counterclockwise equally spacedly along circumference, and described blade 3 is arranged between preceding wheel disc 1 and the rear trochal disc 2.

Referring to Fig. 3, described blade 3 cross sections are similar to " S " type.(50～100mm) is big, and (15～65mm) is little, and form by circular arc is tangent between the two big or small circular arcs for the radius of curvature R 2 away from rear trochal disc 2 centre circular arcs of blade 3 for the radius of curvature R 1 of the close rear trochal disc 2 centre circular arcs of described blade 3.

Described blade 3 can change the direction of blade size circular arc radius of curvature according to the needs of servosteering.Described blade 3 can be designed to 8～30 as required.

The utility model impeller is used for 3000～9500 rev/mins, the power power at 1～4KW.Impeller outer diameter 200～320mm, the intake grill 1.1 diameters 100～220mm of front-wheel disk center.The utility model impeller can be made by plastics or metal.

Claims

1, a kind of small-sized high speed centrifugal blower fan enclosed impeller of " S " type new blade, comprise rear trochal disc (2) and blade (3), described blade (3) is vertically mounted on the described rear trochal disc (2) clockwise or counterclockwise equally spacedly along circumference, it is characterized in that described blade (3) cross section is similar to " S " type.

2, a kind of small-sized high speed centrifugal blower fan according to claim 1 enclosed impeller of " S " type new blade, the radius of curvature of close rear trochal disc (2) centre circular arc that it is characterized in that described blade (3) is big, the radius of curvature away from rear trochal disc (2) centre circular arc of blade (3) is little, and forms by circular arc is tangent between the two big or small circular arcs.

3, a kind of small-sized high speed centrifugal blower fan according to claim 2 enclosed impeller of " S " type new blade, it is characterized in that described radius of curvature near rear trochal disc (2) centre circular arc is 50～100mm, the radius of curvature away from rear trochal disc (2) centre circular arc of blade (3) is 15～65mm.

4, according to the enclosed impeller of one of them described a kind of small-sized high speed centrifugal blower fan of claim 1～3, it is characterized in that described blade (3) has 8～30 with " S " type new blade.