CN101334041A

CN101334041A - Star-shaped vane closed impeller for small-sized high speed centrifugal blower fan

Info

Publication number: CN101334041A
Application number: CNA200810021313XA
Authority: CN
Inventors: 吴晓龙
Original assignee: JIANGYIN CITY AGRICULTURE CHEMICAL EQUIPMENT FACTORY
Current assignee: JIANGYIN CITY AGRICULTURE CHEMICAL EQUIPMENT FACTORY
Priority date: 2008-07-17
Filing date: 2008-07-17
Publication date: 2008-12-31

Abstract

The invention relates to a Z-shaped novel enclosed type impeller used for the small-sized high-speed centrifugal fan. The Z-shaped novel enclosed type impeller comprises a rear wheel disc (2) and blades (3), the blades (3) are perpendicularly arranged on the rear wheel disc (2) at equal intervals along the circumference clockwise or anticlockwise and the enclosed type impeller is characterized in that the cross section of the blade (3) is similar to the Z shape. The air flow at an air inlet opening in the center of the front wheel disc firstly enters into a large circular arc part of the blade close to the center of the rear wheel disc when the impeller rotates at high speed, and then the air flow is glidingly transmitted and enters into a small circular arc part far away from the center of the rear wheel disc, the air dynamic pressure is increased, the flow velocity is accelerated, and the air flow is jetted out after passing through a flow channel of the fan casing. The invention has the advantages that the deficiency that the power is interfered and affected by the air flow of the former the long-short blade type impeller is changed, therefore, the efficiency of the fan is improved by more than 5 percent, and the noise is decreased by more than 3 decibels.

Description

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

Technical field

The present invention relates to a kind of small-sized high speed centrifugal blower fan, especially relate 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 objective of the invention is to overcome above-mentioned deficiency, the small-sized high speed centrifugal blower fan that provides an a kind of more step to improve effect and reduction noise is used

The enclosed impeller of type new blade.

The object of the present invention is achieved like this: a kind of small-sized high speed centrifugal blower fan is used The enclosed impeller of type new blade comprises rear trochal disc and blade, and 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 Type.

Impeller of the present invention 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 present invention 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 uses for small-sized high speed centrifugal blower fan of the present invention

The side structure schematic representation of the enclosed impeller of 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 present invention relates to is used

The enclosed impeller of type new blade mainly is made up of preceding wheel disc 1, rear trochal disc 2 and blade 3.

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

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.

Impeller of the present invention 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.Impeller of the present invention can be made by plastics or metal.

Claims

1, a kind of small-sized high speed centrifugal blower fan with "

" enclosed impeller of 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 be similar to "

" type.

2, a kind of small-sized high speed centrifugal blower fan according to claim 1 with "

" enclosed impeller of 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 with "

" enclosed impeller of 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 one of them described a kind of small-sized high speed centrifugal blower fan of claim 1～3 with "

" enclosed impeller of type new blade, it is characterized in that described blade (3) has 8～30.