Blade for centrifugal impeller, centrifugal impeller and centrifugal fan

Abstract

The utility model relates to a blade for a centrifugal impeller, the centrifugal impeller and a centrifugal fan. The blade for the centrifugal impeller is integrally in an arc shape and comprises a bottom connecting part used for being fixedly connected with an impeller rear disc and a front disc connecting part used for being fixedly connected with an impeller front disc. The beveled side parts and the air outlet side parts are arranged on the two sides of the blades; the air inlet side part comprises a vertical edge part and an arc-shaped edge part, and the edge of the arc-shaped edge part is arc-shaped. According to the blade for the centrifugal impeller, the R100-R250 arc-shaped edge parts are arranged, so that the stress in the using process is effectively reduced. Furthermore, when the impeller with the corner beveling is applied to a fan with a higher rotating speed and a larger diameter, the impeller needs to be reinforced through the ring ribs, so that the cost of adding the ring ribs can be saved, and the air volume, the air pressure and the efficiency are not reduced due to adding the ring ribs.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal fan technical field, especially a kind of blade for centrifugal impeller and a kind of centrifugal impeller and centrifugal fan. BACKGROUND

[0002] In the commonly used centrifugal impeller, there are many with corner chamfer, for example, the centrifugal impeller used in T4-72, 4-79 series fan, as shown in Figure 1 And Figure 2 .

[0003] Chamfer is a special structural feature of centrifugal impeller. The airflow at the inlet of centrifugal impeller is axial, and the airflow at the outlet is radial. The airflow turns at the chamfer of impeller. Chamfer can adapt to the uneven phenomenon of airflow at the turning place, improve its flow, and help to improve the aerodynamic performance of fan.

[0004] Although chamfer can improve performance, it can also greatly reduce strength. Through simulation calculation, if chamfer is not properly applied, stress will increase by 150% to 250%. This disadvantage is more practical in the actual application of large-diameter centrifugal impeller.

[0005] In the prior art, as shown in Figure 3 And Figure 4 , the strengthening method is to pass round bar at chamfer (1-5 in Figure 4 ). Although this method can meet the strength requirement to some extent, it has obvious shortcomings. After passing round bar at chamfer, the aerodynamic performance of impeller is greatly reduced. In some occasions where the requirement is not high, it is still acceptable, but in some occasions where the efficiency requirement is high, it cannot meet the requirement. INVENTION CONTENTS

[0006] In view of the deficiencies in the prior art, the utility model provides a kind of blade for centrifugal impeller, the whole blade is arc-shaped, including bottom connecting part for being fixedly connected with impeller rear disc, front disc connecting part for being fixedly connected with impeller front disc;It also includes chamfer side part and air outlet side part on both sides of blade;The air inlet side part includes vertical edge and arc-shaped edge, and the edge of arc-shaped edge is arc-shaped.

[0007] On the basis of the above scheme, the arc edge of arc-shaped edge is R100-R250 round edge.

[0008] On the basis of the above scheme, the minimum distance H of the intersection of chamfer side part and air outlet side part from the inlet of impeller front disc is 1% of impeller diameter+5 mm.

[0009] The application further provides a centrifugal impeller, comprising an impeller front disc, an impeller rear disc and a plurality of blades fixed between the impeller front disc and the impeller rear disc; the blade comprises a bottom connecting part fixedly connected with the impeller rear disc, a front disc connecting part fixedly connected with the impeller front disc, a bevelled side part located on both sides of the blade and an air outlet side part; the air outlet side part comprises a vertical side part and an arc-shaped side part, and the edge of the arc-shaped side part is in an arc shape.

[0010] On the basis of the above scheme, the arc edge of the arc-shaped side part is a round edge with a radius of R100 to R250.

[0011] On the basis of the above scheme, the minimum distance H between the intersection of the bevelled side part and the air outlet side part and the inlet of the impeller front disc is 1% of the diameter of the impeller plus 5 mm.

[0012] The application further provides a centrifugal fan comprising the blade or the centrifugal impeller.

[0013] The application has the following beneficial effects:

[0014] The blade for the centrifugal impeller has the arc-shaped side part with a radius of R100 to R250, so that the stress during use is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a structural schematic view of a blade in the prior art;

[0016] Figure 2 FIG. 2 is a structural schematic view of a centrifugal impeller using the blade in the prior art; Figure 1

[0017] FIG. 3 is a structural schematic view of another blade in the prior art; Figure 3

[0018] FIG. 4 is a structural schematic view of a centrifugal impeller using the blade in the prior art; Figure 4 Figure 3 FIG. 5 is a structural schematic view of a blade in the embodiment 1 of the application;

[0019] Figure 5 FIG. 6 is a structural schematic view of a centrifugal impeller using the blade in the embodiment 1 of the application;

[0020] Figure 6 Figure 5 FIG. 7 is a structural schematic view of a blade in the embodiment 2 of the application;

[0021] Figure 7 FIG. 8 is a structural schematic view of a centrifugal impeller using the blade in the embodiment 2 of the application; Figure 6

[0022] ​​​Figure 8 For use Figure 5 Top view perspective structural schematic diagram of centrifugal impeller with leaflets;

[0023] Figure 9 For use Figure 5 Three-dimensional perspective structural schematic diagram of centrifugal impeller with leaflets;

[0024] Figure 10 For use Figure 1 Three-dimensional perspective structural schematic diagram of centrifugal impeller with leaflets. DETAILED DESCRIPTION

[0025] The terms used in the present application have the meanings generally understood by those of ordinary skill in the art, unless otherwise specified.

[0026] The present application will be further described in detail below with reference to specific examples and data. The following examples are merely intended to illustrate the present application, and not to limit the scope of the present application in any way.

[0027] Example 1

[0028] As shown in Figures 3-9 The present application provides a kind of for centrifugal impeller's leaflet, the leaflet is overall arc (as shown in Figure 8 It includes bottom connecting portion 1-1 for being fixedly connected with impeller rear disc, front disc connecting portion 1-2 for being fixedly connected with impeller front disc;It also includes the bevel side 1-3 of leaflet two sides and air outlet side 1-4;Its characterized in that, the air inlet side 1-3 includes vertical edge 1-31 and arc edge 1-32.

[0029] Traditional leaflet does not have arc edge 1-32, and a oblique straight edge replaces arc edge, and the oblique straight edge is at a certain angle with vertical edge 1-31, and the angle is between 110 °-140 °. Impeller mainly bears centrifugal force load, and under centrifugal force load, oblique straight edge forms a cantilever structure (as indicated by the position of a in Figure 10 The larger the area, the worse the structural stability.

[0030] As a specific embodiment, the arc edge of arc edge 1-32 is R100 ~ R250 round edge. After increasing R100 ~ R250 round edge, the cantilever length can be reduced, and the stress generated by cantilever structure can be reduced.

[0031] As a specific embodiment, the minimum distance H between the intersection of bevel side 1-3 and air outlet side 1-4 and the inlet of impeller front disc is 1% of impeller diameter+5 mm, for example, the calculated H is 10 mm for the impeller with diameter of 500 mm.

[0032] Figure 1 The blade stress in the prior art reaches 1563 MPa, while Figure 5 The blade stress in the prior art reaches 833 MPa.

[0033] The value is calculated by simulation. According to physical modeling, centrifugal force load is applied (3250 rpm, 110% working speed); the maximum stress value of the blade in the prior art (as shown in Figure 1 ) is 1563 MPa, and the maximum stress point is located at the connection between the blade and the rear disc; while the maximum stress value of the blade in the application (as shown in Figure 5 ) is 833 MPa, and the maximum stress point is located at the connection between the blade and the rear disc, and the stress is reduced by 46.7%.

[0034] Embodiment 2

[0035] Based on the blade in Embodiment 1, the application provides a centrifugal impeller, as shown in Figure 8 and 9 .

[0036] Embodiment 3

[0037] Based on the blade in Embodiment 1 and the centrifugal impeller in Embodiment 2, the application provides a centrifugal fan, wherein the impeller in the centrifugal fan uses the centrifugal impeller in Embodiment 2, or the centrifugal impeller in the centrifugal fan uses the blade in Embodiment 1.

[0038] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technical content to obtain equivalent embodiments. However, any simple modification, equivalent change and modification of the above embodiments without departing from the technical content of the present application, and according to the technical essence of the present application, still belong to the protection scope of the present application.

Claims

1. A blade for a centrifugal impeller, the blade being arc-shaped as a whole, comprising a bottom connecting part (1-1) for fixed connection with a rear disc of the impeller, a front disc connecting part (1-2) for fixed connection with a front disc of the impeller, and further comprising bevelled side parts (1-3) on both sides of the blade and an air outlet side part (1-4), characterized in that, The chamfered side (1-3) comprises a vertical edge (1-31) and an arc-shaped edge (1-32), and the edge of the arc-shaped edge (1-32) is arc-shaped.

2. Blade for a centrifugal impeller according to claim 1, characterized in that The arc edge of the arc-shaped edge (1-32) is a round edge with a radius of R100 to R250.

3. A blade for a centrifugal impeller according to claim 1, characterized in that The minimum distance H between the joint of the chamfered side (1-3) and the air outlet side (1-4) and the inlet of the impeller front disc is 1% of the impeller diameter plus 5 mm.

4. A centrifugal impeller, comprising an impeller front disc (2), an impeller rear disc (3) and a plurality of blades (1) fixed between the impeller front disc (2) and the impeller rear disc (3); the blade (1) comprises a bottom connecting part (1-1) fixedly connected with the impeller rear disc (3), a front disc connecting part (1-2) fixedly connected with the impeller front disc (2), an oblique cutting side part (1-3) located on both sides of the blade (1) and an air outlet side part (1-4); characterized in that, The chamfered side (1-3) comprises a vertical edge (1-31) and an arc-shaped edge (1-32), and the edge of the arc-shaped edge (1-32) is arc-shaped.

5. The centrifugal impeller of claim 4, wherein, The arc edge of the arc-shaped edge (1-32) is a round edge with a radius of R100 to R250.

6. The centrifugal impeller of claim 4, wherein The minimum distance H between the joint of the chamfered side (1-3) and the air outlet side (1-4) and the inlet of the impeller front disc (2) is 1% of the impeller diameter plus 5 mm.

7. A centrifugal fan characterized by A centrifugal impeller comprising the blade of any one of claims 1-3 or the centrifugal impeller of any one of claims 4-6.

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