阅读说明：本技术 一种离心风机叶轮 (Centrifugal fan impeller ) 是由 杨洪军 于 2019-12-18 设计创作，主要内容包括：本发明提供了一种离心风机叶轮,属于风机技术领域。本离心风机叶轮包括轮盘、具有进气孔的轮盖以及设置在轮盘和轮盖之间的叶片,叶片有多个并沿轮盖周向间隔均布,叶片为一体式结构并呈沿轮盖径向延伸的弧形,叶片由均呈圆弧形的片段一、片段二和片段三组成,片段一、片段二和片段三直径均不同,片段二两端分别与片段一和片段三连接,且片段三远离片段二的一端延伸至与进气孔正对；片段一沿轮盖旋转方向弯曲,且片段二和片段三弯曲方向均与片段一相反,片段一和片段二交接的两端的切线共线,片段二和片段三交接的两端的切线共线,相邻两叶片之间的距离自轮盖外侧向轮盖内侧方向逐渐变小。本离心风机叶轮能实现小流量大压力。(The invention provides a centrifugal fan impeller, and belongs to the technical field of fans. The centrifugal fan impeller comprises a wheel disc, a wheel cover with an air inlet hole and blades arranged between the wheel disc and the wheel cover, wherein a plurality of blades are uniformly distributed at intervals along the circumferential direction of the wheel cover, the blades are of an integrated structure and are arc-shaped and extend along the radial direction of the wheel cover, the blades consist of a first segment, a second segment and a third segment which are all arc-shaped, the diameters of the first segment, the second segment and the third segment are different, two ends of the second segment are respectively connected with the first segment and the third segment, and one end, far away from the second segment, of the third segment extends to be opposite to the air inlet hole; the first segment is bent along the rotating direction of the wheel cover, the second segment and the third segment are opposite to the first segment in the bending direction, the tangent lines of the two ends of the first segment and the second segment are collinear, the tangent lines of the two ends of the second segment and the third segment are collinear, and the distance between every two adjacent blades is gradually reduced from the outer side of the wheel cover to the inner side of the wheel cover. The centrifugal fan impeller can realize small flow and large pressure.)

1. A centrifugal fan impeller comprises a wheel disc (1), a wheel cover (2) with an air inlet hole (2a1) and blades (3) arranged between the wheel disc (1) and the wheel cover (2), wherein the blades (3) are multiple and uniformly distributed at intervals along the circumferential direction of the wheel cover (2), and the centrifugal fan impeller is characterized in that the blades (3) are of an integrated structure and are in an arc shape extending along the radial direction of the wheel cover (2), the blades (3) are composed of a first segment (3a), a second segment (3b) and a third segment (3c) which are all arc-shaped, the diameters of the first segment (3a), the second segment (3b) and the third segment (3c) are different, two ends of the second segment (3b) are respectively connected with the first segment (3a) and the third segment (3c), and one end, far away from the second segment (3b), of the third segment (3c) extends to be opposite to the air inlet hole (2a 1); the first segment (3a) is bent along the rotating direction of the wheel cover (2), the bending directions of the second segment (3b) and the third segment (3c) are opposite to the first segment (3a), the tangent lines of the two ends where the first segment (3a) and the second segment (3b) are connected are collinear, the tangent lines of the two ends where the second segment (3b) and the third segment (3c) are connected are collinear, and the distance between every two adjacent blades (3) is gradually reduced from the outer side of the wheel cover (2) to the inner side of the wheel cover (2).

2. The centrifugal fan impeller as claimed in claim 1, wherein the two opposite sides of the wheel disc (1) and the wheel cover (2) are flat surfaces, the edges of the two flat surfaces form an annular exhaust channel (4), the vane (3) is located between the exhaust channel (4) and the air inlet (2a1), and one end of the segment one (3a) far away from the segment two (3b) extends to the exhaust channel (4).

3. The centrifugal fan impeller according to claim 1 or 2, wherein the impeller cover (2) is provided with a tubular air inlet part (2a) which is coaxial with the impeller cover (2), the impeller cover (2) is located between the air inlet part (2a) and the blades (3), an inner hole of the air inlet part (2a) is the air inlet hole (2a1), and the cross section of the pipe wall of the air inlet part (2a) in the axial direction of the impeller cover (2) is in the shape of an inwards concave circular arc.

4. Centrifugal fan impeller according to claim 1 or 2, wherein the diameter of segment three (3c) is smaller than the diameter of segment two (3b) and the length of segment three (3c) is smaller than the length of segment two (3 b).

5. Centrifugal fan impeller according to claim 4, wherein the diameter of segment one (3a) is smaller than the diameter of segment three (3 c).

Technical Field

The invention belongs to the technical field of fans, relates to a centrifugal fan, and particularly relates to a centrifugal fan impeller.

Background

The centrifugal fan is a driven fluid machine which increases the pressure of gas and discharges the gas by means of input mechanical energy. Centrifugal fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and draught of boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliances; drying and selecting grains; wind tunnel wind source and air cushion boat inflation and propulsion.

In current centrifugal fan, the inflow is generally in direct proportion with pressure of giving vent to anger, and inflow is little promptly, and pressure of giving vent to anger is also little, leads to present centrifugal fan can't satisfy some operating modes that need little flow big pressure and use.

Disclosure of Invention

The invention aims to provide a centrifugal fan impeller with small flow and large pressure aiming at the problems in the prior art.

The purpose of the invention can be realized by the following technical scheme: a centrifugal fan impeller comprises a wheel disc, a wheel cover with an air inlet hole and blades arranged between the wheel disc and the wheel cover, wherein the blades are multiple and uniformly distributed at intervals along the circumferential direction of the wheel cover; the first segment is bent along the rotating direction of the wheel cover, the bending directions of the second segment and the third segment are opposite to the first segment, the tangent lines of the two ends where the first segment is connected with the second segment are collinear, the tangent lines of the two ends where the second segment is connected with the third segment are collinear, and the distance between every two adjacent blades is gradually reduced from the outer side of the wheel cover to the inner side of the wheel cover.

The distance between two adjacent blades is gradually increased along with the direction of the air flow, so that the air passage forms a structure with a narrow front section and a wide rear section, the front sections of the blades form a second segment and a third segment which are bent in the same direction, the air flow is enabled to stably enter the air passage, the bending direction of the first segment is opposite to that of the second segment and the third segment, the discharging direction of the air flow is rapidly changed, and the air flow is enabled to be rapidly pressurized and discharged.

In the centrifugal fan impeller, two opposite side surfaces of the wheel disc and the wheel cover are planes, the edges of the two planes form an annular exhaust channel, the blades are positioned between the exhaust channel and the air inlet, and one end of the first segment, which is far away from the second segment, extends to the exhaust channel. The outlet of the air passage formed by two adjacent blades is communicated with the exhaust passage formed by two planes, so that the air flow flowing out of the air passage can be mixed, transferred and redistributed, and finally the uniform vortex disappears gradually, so that the air flow is high in pressure and flows out stably.

In the centrifugal fan impeller, the wheel cover is provided with the tubular air inlet part which is coaxial with the wheel cover, the wheel cover is positioned between the air inlet part and the blades, the inner hole of the air inlet part is the air inlet hole, and the section of the pipe wall of the air inlet part in the axial direction of the wheel cover is in the shape of an inwards concave arc. The air inlet part with the pipe wall in the shape of the concave arc is arranged for air inlet, so that air flow can stably enter an air passage formed by two adjacent blades, and vortex is effectively avoided.

In the centrifugal fan impeller, the diameter of the third segment is smaller than that of the second segment, and the length of the third segment is smaller than that of the second segment.

In the centrifugal fan impeller, the diameter of the first segment is smaller than that of the third segment.

Compared with the prior art, the centrifugal fan impeller has the following advantages:

1. the distance between two adjacent blades is gradually increased along with the direction of the air flow, so that the air passage forms a structure with a narrow front section and a wide rear section, the front sections of the blades form a second segment and a third segment which are bent in the same direction, the air flow is enabled to stably enter the air passage, the bending direction of the first segment is opposite to that of the second segment and the third segment, the discharging direction of the air flow is rapidly changed, and the air flow is enabled to be rapidly pressurized and discharged.

2. The outlet of the air passage formed by two adjacent blades is communicated with the exhaust passage formed by two planes, so that the air flow flowing out of the air passage can be mixed, transferred and redistributed, and finally the uniform vortex disappears gradually, so that the air flow is high in pressure and flows out stably.

3. The outlet of the air passage formed by two adjacent blades is communicated with the exhaust passage formed by two planes, and the speed energy of the airflow can be converted into pressure energy, so that the pressure of the airflow is improved.

Drawings

Fig. 1 is a schematic sectional structure view of the centrifugal fan impeller.

FIG. 2 is a perspective view of the disk and blade connection.

FIG. 3 is a schematic top view of the disk and blade connection.

FIG. 4 is a graph of centrifugal fan system performance test pressure, flow and efficiency.

FIG. 5 is a graph of centrifugal fan train performance test pressure, flow and shaft power.

In the figure, 1, a wheel disc; 2. a wheel cover; 2a, an air inlet part; 2a1, intake; 3. a blade; 3a, fragment one; 3b, fragment two; 3c, fragment three; 4. an exhaust passage.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the centrifugal fan impeller comprises a wheel disc 1, a wheel cover 2 with an air inlet hole 2a1 and a blade 3 arranged between the wheel disc 1 and the wheel cover 2, wherein the wheel disc 1 and the wheel cover 2 are coaxially arranged, and two sides of the blade 3 are fixedly connected with the wheel cover 2 and the wheel disc 1 respectively. The blades 3 are distributed at intervals along the circumferential direction of the wheel cover 2, and in the embodiment, the number of the blades 3 is preferably 16.

Specifically, the wheel cover 2 has an air inlet 2a thereon, which is tubular and arranged coaxially with the wheel cover 2, and the wheel cover 2 and the air inlet 2a are preferably of an integral structure. The wheel cover 2 is positioned between the air inlet part 2a and the blade 3, and the inner hole of the air inlet part 2a is an air inlet hole 2a1 of the wheel cover 2. The section of the pipe wall of the air inlet part 2a in the axial direction of the wheel cover 2 is in a concave arc shape.

As shown in fig. 1 and 2, the vane 3 is of an integral structure and has an arc shape extending along the radial direction of the shroud 2, the vane 3 is composed of a first segment 3a, a second segment 3b and a third segment 3c, which are all arc-shaped, and the diameters of the first segment 3a, the second segment 3b and the third segment 3c are all different. In this embodiment, the diameter of segment two 3b is the largest, the diameter of segment one 3a is the smallest, and the length of segment two 3b is greater than the length of segment three 3 c.

As shown in fig. 2 and 3, two ends of the second segment 3a are respectively connected with the first segment 3a and the third segment 3c, and one end of the third segment 3c far away from the second segment 3b extends to be opposite to the air inlet 2a 1; the first segment 3a is bent along the rotating direction of the wheel cover 2, the bending directions of the second segment 3b and the third segment 3c are opposite to the first segment 3a, the tangent lines of the two ends where the first segment 3a and the second segment 3b are connected are collinear, the tangent lines of the two ends where the second segment 3b and the third segment 3c are connected are collinear, and the distance between every two adjacent blades 3 is gradually reduced from the outer side of the wheel cover 2 to the inner side of the wheel cover 2.

Further, two opposite side surfaces of the wheel disc 1 and the wheel cover 2 are planes, the edges of the two planes form an annular exhaust channel 4, the vane 3 is located between the exhaust channel 3 and the air inlet hole 2a1, and one end of the segment one 3a far away from the segment two 3b extends to the exhaust channel 4. The outlet of the air passage formed by two adjacent blades 3 is communicated with an exhaust passage 4 formed by two planes, so that the air flow flowing out of the air passage can be mixed, transferred and redistributed, and finally the uniform vortex disappears gradually, so that the air flow flows out stably under high pressure.

As shown in fig. 4 and 5 and the following test tables, the centrifugal fan not only has a large outlet pressure but also has the advantages of high efficiency and low noise when the flow rate is small.

Centrifugal fan test meter

And (3) testing temperature: 19 ℃; revolution number: 2910r/mi n

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.