阅读说明：本技术 一种仿生叶片离心通风机叶轮 (Impeller of bionic blade centrifugal ventilator ) 是由 裘霖富 张职峰 马杰凯 徐天赐 俞晓骏 刘伟 于 2020-07-10 设计创作，主要内容包括：本发明公开了一种仿生叶片离心通风机叶轮,包括前盘、后盘以及均匀夹设在所述前盘和后盘之间的多个叶片,所述叶片内缘为仿座头鲸尾鳍外侧边缘的光滑弧线,所述弧线从前盘侧到后盘侧依次包括舌状部“ABCD”、斜切段“DE”和上凸的圆弧段“EF”,其中A点为叶片内缘前端点,F点为叶片内缘后端点。本发明通过优化后向离心通风机叶片内缘弧线形状,减小叶片入口气流冲击损失,以提高通风机性能和效率,即提高通风机出力并节能降耗和降低噪声。(The invention discloses a bionic blade centrifugal ventilator impeller, which comprises a front disc, a rear disc and a plurality of blades uniformly clamped between the front disc and the rear disc, wherein the inner edge of each blade is a smooth arc line imitating the outer edge of a tail fin of a whale head, the arc line sequentially comprises a tongue-shaped part 'ABCD', a chamfered section 'DE' and an upwards-protruding arc section 'EF' from the front disc side to the rear disc side, wherein a point A is a front end point of the inner edge of each blade, and a point F is a rear end point of the inner edge of each blade. The invention reduces the air flow impact loss at the inlet of the blade by optimizing the arc shape of the inner edge of the blade of the backward centrifugal ventilator so as to improve the performance and efficiency of the ventilator, namely, the output of the ventilator is improved, the energy is saved, the consumption is reduced and the noise is reduced.)

1. A bionic blade centrifugal ventilator impeller is characterized by comprising a front disc, a rear disc and a plurality of blades uniformly clamped between the front disc and the rear disc, wherein a space enclosed by adjacent blades, the front disc and the rear disc is an airflow channel between the blades in the impeller, airflow axially enters the impeller from the front disc, and flows out of the periphery of the impeller after passing through the flow channel between the blades;

the edges of the blades comprise an inner edge, an outer edge, a front edge and a rear edge, the front edge is connected with the inner side of the front disc, the rear edge is connected with the inner side of the rear disc, the inner edge forms an inlet of the flow channel, and the outer edge forms an outlet of the flow channel;

the inner edge is a smooth arc line of the outer edge of the tail fin of the whale head-imitating whale, the arc line sequentially comprises a tongue-shaped part 'ABCD', a beveling section 'DE' and an upwards-convex arc section 'EF' from the front disc side to the rear disc side, wherein a point A is a front end point of the inner edge of the blade, and a point F is a rear end point of the inner edge of the blade.

2. A centrifugal fan impeller with bionic blades as claimed in claim 1, wherein the projection of the straight line "AF" in the axial direction of the impeller is the width b of the inlet of the blade₁The projection of "EF" in the axial direction of the impeller is b_E，b_E=k×b₁Wherein k = 0.50-0.65.

3. A centrifugal fan impeller with bionic blades as claimed in claim 2, wherein the included angle between the straight line "AF" and the axial direction of the impeller is α, and the included angle between the straight line "ED" and the impeller shaft is αThe included angle in the line direction is beta, the arc segment 'EF' is convex upwards, and the radius R = b_E/[2×sin(α+β) ×cosα]Wherein β =4 ° -8 °.

4. A centrifugal ventilator wheel with bionic blades as claimed in claim 1, wherein the arc segment "EF" and the straight line "DE" are tangent to point E.

5. A bionic-blade centrifugal ventilator wheel according to claim 1 wherein the tongue portion "ABCD" comprises a vertical section "AB", a diagonal section "BC" and a circular section "CD".

6. A centrifugal ventilator wheel with bionic blades as claimed in claim 5, wherein the length of the vertical section "AB" is 3-6 mm.

7. A centrifugal ventilator wheel with bionic blades as claimed in claim 5, wherein the included angle between the oblique line segment "BC" and the straight line "AB" is 10-40 °.

8. The impeller of the bionic blade centrifugal ventilator according to claim 5, wherein the radius of the circular arc section "CD" is 1.5-5 mm.

9. A method of designing a biomimetic blade for a centrifugal ventilator, the blade being adapted for use with a centrifugal ventilator wheel as claimed in any one of claims 1 to 8, comprising the steps of:

the minimum diameter point of the blade working surface connected with the inner side of the rear disk is a point F, the minimum diameter point of the blade working surface connected with the inner side of the front disk is a point A, and the connecting line of the points is a straight line AF;

the included angle between the straight line AF and the axial direction is alpha, and the corresponding blade inlet width is b₁Selecting point E on AF, and the projection of 'EF' in the axial direction of the impeller is b_E，B is caused to be_E=k×b₁Wherein k = 0.50-0.65;

making a straight line 'ED' passing through the point E, wherein the included angle beta between the 'ED' and the axial direction is = 4-8 degrees;

and passing through the point E and the point F, making an arc 'EF' tangent to the straight line 'ED', wherein the radius of the arc 'EF' is as follows: r = b_E/[2×sin(α+β)×cosα]；

An inward vertical line segment AB = 3-6 mm passing through the point A;

a line segment BC which passes through the point B and inclines towards the air inlet direction is formed, and the inclination angle theta of the BC = 10-40 degrees;

and (3) carrying out rounding treatment on a sharp corner formed between the straight line BC and the straight line ED, wherein the radius r = 1.5-5 mm.

Technical Field

The invention belongs to the technical field of ventilators, and particularly relates to a bionic blade centrifugal ventilator impeller.

Background

Due to the particularity of equipment, air conditioners in machine rooms and base stations need to continuously and uninterruptedly operate, so that the performance of a ventilator for the air conditioners is particularly important, the aerodynamic performance and the efficiency of the ventilator directly relate to the consumption of electric energy, the ventilator for the air conditioners generally adopts a backward volute-free centrifugal ventilator, an impeller of the centrifugal ventilator mainly comprises a rear disc, blades and a front disc, and the blades are key parts of the impeller of the centrifugal ventilator.

In the meridian plane of the impeller, in order to accommodate a large turn of 90 degrees after the main air flow enters the impeller from the axial direction and the speed of the air flow in the axial direction is different before the air flow enters the blade passage, the inner edge of the blade is generally arranged to be in a straight line chamfer shape or a circular arc chamfer shape.

The inner edge of the backward centrifugal fan blade is arc-shaped, and compared with the blade with a flat inner edge, the flow field difference of different positions of the inlet end of the blade along the axial direction is considered. The inlet diameters and the inlet installation angles of the blades at different axial positions of the blade-shaped air inlet device generally show a gradually increasing trend from the rear disk side to the front disk side, but actually, the speed and the direction of the airflow at the inlet of the blade are not uniformly changed from the rear disk side to the front disk side, so that the shape of the arc line at the inlet edge of the blade can be further optimized, the impact angle of the airflow entering the blade channel is reasonable, the impact loss and the turbulence degree are further reduced, and the main airflow in the subsequent blade channel is more stable.

Disclosure of Invention

The invention reduces the air flow impact loss at the inlet of the blade by optimizing the arc shape of the inner edge of the blade of the backward centrifugal ventilator so as to improve the performance and efficiency of the ventilator, namely, the output of the ventilator is improved, the energy is saved, the consumption is reduced and the noise is reduced.

The technical scheme of the invention is as follows:

a bionic blade centrifugal ventilator impeller comprises a front disc, a rear disc and a plurality of blades uniformly clamped between the front disc and the rear disc, wherein a space enclosed by adjacent blades, the front disc and the rear disc is a flow channel of airflow, and the airflow axially enters the impeller from the front disc, passes through the flow channel and then flows out from the periphery of the impeller;

the edges of the blades comprise inner edges, outer edges, front edges and rear edges, the front edges are fixedly connected to the inner side of the front disc, the rear edges are fixedly connected to the inner side of the rear disc, the inner edges form an inlet of a flow channel, and the outer edges form an outlet of the flow channel;

the inner edge is a smooth arc line of the outer edge of the tail fin of the whale head-imitating whale, the arc line sequentially comprises a tongue-shaped part 'ABCD', a beveling section 'DE' and an upwards-convex arc section 'EF' from the front disc side to the rear disc side, wherein a point A is a front end point of the inner edge of the blade, and a point F is a rear end point of the inner edge of the blade.

Further, the projection of the straight line "AF" in the axial direction of the impeller is the width b of the inlet of the blade₁The projection of "EF" in the axial direction of the impeller is b_E，b_E=k×b₁Wherein k = 0.50-0.65.

Further, an included angle between the straight line "AF" and the axial direction of the impeller is α, an included angle between the straight line "ED" and the axial direction of the impeller is β, and the radius R = b of the circular arc segment "EF ″_E/[2×sin(α+β) ×cosα]Wherein β =4 ° -8 °.

Further, the arc segment "EF" is tangent to the straight line "DE" at point E.

Further, the tongue portion "ABCD" includes a vertical section "AB", a diagonal section "BC", and a circular section "CD".

Further, the length of the vertical section AB is 3-6 mm.

Furthermore, the included angle between the inclined line segment "BC" and the straight line "AB" is 10-40 degrees.

Furthermore, the radius of the circular arc section 'CD' is 1.5-5 mm.

A bionic blade design method of a centrifugal fan comprises the following steps:

the first step, the minimum diameter point of the blade working surface connected with the inner side of the back disk is a point F, and the blade tool

The minimum diameter point of the connection between the working surface and the inner side of the front disc is a point A, and the connection line is a straight line AF;

secondly, the included angle between the straight line AF and the axial direction is alpha, and the corresponding blade inlet width is b₁In AF

Selecting point E and 'EF'The projection in the axial direction of the impeller is b_E，B is caused to be_E=k×b₁Wherein k = 0.50-0.65;

thirdly, drawing a straight line 'ED' passing through the point E, wherein the included angle beta between the 'ED' and the axis direction is = 4-8 degrees;

fourthly, passing through the point E and the point F, making an arc ' EF ' tangent to the straight line ' ED ', and making the arc ' EF

The radius is: r = b_E/[2×sin(α+β) ×cosα]；

Fifthly, passing the point A and drawing a vertical line segment AB = 3-6 mm inwards;

sixthly, a line segment BC which inclines towards the air inlet direction is formed after the point B passes through, and the inclination angle theta of the BC is = 10-40 degrees;

seventhly, rounding the sharp corner formed between the straight line BC and the straight line ED,

the fillet radius r = 1.5-5 mm.

The invention has the beneficial effects that:

the invention discloses a blade of a centrifugal ventilator, which has larger width, and the front edge of the blade is a smooth arc line imitating the outer edge of a tail fin of a whale head because the turning radius and the flow speed of airflow are different at different positions along the central line direction of a main shaft at the inlet part of the blade.

The bionic arc-shaped blades are arranged on the inner edges of the blades, so that the axial flow field of airflow before entering the flow channel is optimized, the performance and efficiency of the ventilator are improved, the energy consumption and noise are reduced, the highest efficiency point deviates to a large flow area, and the application range of the ventilator is expanded.

Drawings

FIG. 1 is a front view of an impeller with straight-line beveling of the inner edge of a blade of a comparative sample machine 1;

FIG. 2 is a front view of an impeller with an arc-shaped bevel on the inner edge of a blade of a comparative sample machine 2;

FIG. 3 is a front view of an impeller of embodiments 1 and 2 of a bionic-blade centrifugal fan impeller of the invention;

FIG. 4 is an enlarged view of the portion I of the impeller of the bionic-blade centrifugal fan in FIG. 3;

FIG. 5 is a front view of an impeller according to embodiment 3 of the present invention;

FIG. 6 is a graph comparing the static pressures of example 1 and comparative sample 1;

FIG. 7 is a graph comparing the static pressure efficiency of example 1 with that of comparative sample 1;

FIG. 8 is a graph comparing the static pressures of example 3 and comparative sample 2;

fig. 9 is a graph comparing the static pressure efficiency of example 3 with that of comparative sample 2.

In the figure, 1 is a rear disk 2, 3 is a blade and a front disk.

Detailed Description