阅读说明：本技术 一种风机的风扇结构 (Fan structure of fan ) 是由 蒋剑 陈岩 王欢 王宇峰 黄青宇 于 2019-11-14 设计创作，主要内容包括：本发明公开了一种风机的风扇结构,属于风机叶片技术领域。包括扇叶和轮毂,所述扇叶根部上部分固定连接于轮毂侧壁,所述扇叶根部下部分突出于轮毂侧壁和轮毂下表面；所述扇叶根部下部分与轮毂侧壁之间固定设置有连接部,所述连接部为三角形结构,所述连接部包括连接部头部和连接部尾部,所述连接部头部固定连接于扇叶根部下部分,所述连接部头部朝向轮毂上表面反方向,所述连接部头部和连接部尾部之间以曲面过渡连接；所述扇叶为前缘弯掠式结构。本发明减小了风扇总体厚度；扇叶采用前缘弯掠式,采用改进翼型,具有优秀的降噪效果；轮毂侧壁不会有积灰死角,风扇不会出现积灰和卷入杂物的情况。(The invention discloses a fan structure of a fan, and belongs to the technical field of fan blades. The fan blade structure comprises fan blades and a hub, wherein the upper part of the root of each fan blade is fixedly connected to the side wall of the hub, and the lower part of the root of each fan blade protrudes out of the side wall of the hub and the lower surface of the hub; a connecting part is fixedly arranged between the lower part of the root of the fan blade and the side wall of the hub, the connecting part is of a triangular structure and comprises a connecting part head and a connecting part tail, the connecting part head is fixedly connected to the lower part of the root of the fan blade, the connecting part head faces the direction opposite to the upper surface of the hub, and the connecting part head and the connecting part tail are in transition connection by a curved surface; the fan blades are of a leading edge bending and sweeping type structure. The invention reduces the total thickness of the fan; the fan blades adopt a front edge sweepback type, adopt an improved wing type and have excellent noise reduction effect; the side wall of the hub has no dust deposition dead angle, and the fan has no dust deposition and no sundries involved.)

1. The utility model provides a fan structure of fan, includes flabellum and wheel hub, its characterized in that:

the hub is of a disc-shaped structure, a through hole is formed in the center of the hub, an annular bulge is arranged at the central through hole in the lower surface of the hub, and the axis of the annular bulge is overlapped with the axis of the through hole;

the upper part of the root part of the fan blade is fixedly connected to the side wall of the hub, and the lower part of the root part of the fan blade protrudes out of the side wall of the hub and the lower surface of the hub; a connecting part is fixedly arranged between the lower part of the root of the fan blade and the side wall of the hub, the connecting part is of a triangular structure and comprises a connecting part head and a connecting part tail, the connecting part head is fixedly connected to the lower part of the root of the fan blade, the connecting part head faces the direction opposite to the upper surface of the hub, and the connecting part head and the connecting part tail are in transition connection by a curved surface;

the fan blades are of a front edge sweepback type structure, and the height of the front edges of the fan blades is not higher than that of the upper surface of the hub.

2. The fan structure of a blower according to claim 1, wherein: the thickness of the hub is 6.5mm-9mm, and the hub ratio is 0.39-0.55.

3. The fan structure of a blower according to claim 2, wherein: the number of the fan blades is 5-11.

4. The fan structure of a blower according to claim 1, wherein: still include the flabellum outer lane, flabellum head fixed connection is in flabellum outer lane inner wall.

5. The fan structure of a blower according to claim 4, wherein: the fan blade outer ring upper end face is fixedly connected with a flanging edge, the flanging edge is annular, and the inner diameter of the flanging edge is equal to the diameter of the fan blade outer ring.

6. The fan structure of a blower according to claim 1, wherein: the side edge close to the upper surface of the hub and the side edge far away from the upper surface of the hub, which are formed by the transition connection of the curved surfaces, between the head part of the connecting part and the tail part of the connecting part are arc-shaped.

7. The fan structure of a blower according to claim 6, wherein: the side that is close to the wheel hub upper surface is the circular-arc that the radius is 40mm, the side that keeps away from the wheel hub upper surface is the circular-arc that the radius is 11 mm.

8. The fan structure of a blower according to claim 1, wherein: the maximum thickness of the fan blade airfoil is located at the position of 30% -33% of the chord length of the chord from the front edge, the maximum thickness of the fan blade airfoil is 8% -8.5% of the chord length, the maximum curved surface of the fan blade airfoil is located at the position of 39.5% -42% of the chord length of the chord from the front edge, and the maximum curved surface of the fan blade airfoil is 7.9% -8.2% of the chord length.

9. The fan structure of a blower according to claim 8, wherein: the flabellum airfoil maximum thickness is located 31.2% department that the chord length was started from the leading edge at the chord length, flabellum airfoil maximum thickness is 8.12% of chord length, the flabellum airfoil maximum camber is located 40.5% department that the chord length was started from the leading edge at the chord length, the flabellum airfoil maximum camber is 8.04% of chord length.

10. The fan structure of a blower according to claim 9, wherein: the root airfoil chord length of the fan blade is 32.8mm, and the fan blade mounting angle is 35.5 degrees.

Technical Field

The invention belongs to the technical field of fan blades, and particularly relates to a fan structure of a fan.

Background

The engine cooling fan is an important component of a vehicle cooling system, and the performance of the fan directly influences the heat dissipation effect of the engine, so that the performance of the engine is influenced. The large automobile has a complex running environment, the inner side of the hub at the center of the fan often has the conditions of dust deposition and inclusion, the running efficiency of the fan is reduced, and the service life of the fan is shortened. In addition, the thickness of the hub of the existing fan is too high, so that the thickness of the fan is too high, and the noise of the existing fan is serious.

The invention discloses a corrugated noise reduction blade and a fan comprising the same in China with the publication number of CN108167223A, and provides the corrugated noise reduction blade, wherein a suction surface of the blade is provided with a corrugated noise reduction structure, and the corrugated noise reduction structure is distributed along the direction from a blade tip to a blade root. The ripple noise reduction structure is composed of at least one group of wave crests and wave troughs, each group of wave crests and wave troughs are arranged along the direction from the trailing edge of the blade to the leading edge of the blade, namely the length direction of each group of wave crests and wave troughs is the same as the direction from the trailing edge of the blade to the leading edge of the blade, and the multiple groups of wave crests and wave troughs form the ripple noise reduction structure and are arranged from the blade tip to the blade root. When the airflow flows through the suction surface of the blade, because the wave crest and the wave trough structures of the corrugated noise reduction structure exist at the suction surface and the rear edge of the blade, the airflow tends to converge towards the wave troughs in the corrugated noise reduction structure, the effect of reducing the separation of the airflow boundary layer or delaying the separation of the airflow boundary layer is achieved, and finally the broadband vortex noise of the fan is reduced.

The Chinese invention with the publication number of CN110259722A discloses a noise reduction impeller for an axial flow fan, which comprises a hub and a plurality of blades arranged on the hub, wherein the surfaces of the blades form a bent structure, and the bent structures arranged on the blades on the hub form a first air duct along the parallel direction of the circular section of the hub; the hub is connected with the motor, and when the motor drove the hub and rotates, the shaping second wind channel between the adjacent blade, the noise that blade during operation produced with the air decomposes it through first wind channel and second wind channel, and then reduces the noise of impeller during operation. The noise reduction impeller for the axial flow fan has the advantages of good noise reduction effect and convenience in production.

However, the two inventions do not improve the hub, the inner side of the hub still has the conditions of dust deposition and sundries inclusion, and the total thickness of the fan is higher.

Disclosure of Invention

The invention aims to solve the technical problem of providing a fan structure of a fan, which has a thinner fan overall thickness, does not have dust-deposition dead corners on the inner side of a hub and has a noise reduction effect.

In order to solve the problems, the technical scheme of the invention is as follows:

a fan structure of a fan comprises fan blades and a hub.

The hub is of a disc-shaped structure, a through hole is formed in the center of the hub, an annular bulge is arranged at the central through hole in the lower surface of the hub, and the axis of the annular bulge is overlapped with the axis of the through hole;

the upper part of the root part of the fan blade is fixedly connected to the side wall of the hub, and the lower part of the root part of the fan blade protrudes out of the side wall of the hub and the lower surface of the hub; a connecting part is fixedly arranged between the lower part of the root of the fan blade and the side wall of the hub, the connecting part is of a triangular structure and comprises a connecting part head and a connecting part tail, the connecting part head is fixedly connected to the lower part of the root of the fan blade, the connecting part head faces the direction opposite to the upper surface of the hub, and the connecting part head and the connecting part tail are in transition connection by a curved surface;

the fan blades are of a front edge sweepback type structure, and the height of the front edges of the fan blades is not higher than that of the upper surface of the hub.

Further, the hub thickness is 6.5mm-9mm, and the hub ratio is 0.39-0.55.

Furthermore, the number of the fan blades is 5-11.

Further, still include the flabellum outer lane, flabellum head fixed connection is in flabellum outer lane inner wall.

Furthermore, the upper end face of the outer ring of the fan blade is fixedly connected with a flanging edge, the flanging edge is annular, and the inner diameter of the flanging edge is equal to the diameter of the outer ring of the fan blade.

Furthermore, the side edge close to the upper surface of the hub and the side edge far away from the upper surface of the hub, which are formed by the transition connection of the head part and the tail part of the connecting part through a curved surface, are arc-shaped.

Further, the side that is close to the wheel hub upper surface is circular-arc that the radius is 40mm, the side that keeps away from the wheel hub upper surface is circular-arc that the radius is 11 mm.

Further, the maximum thickness of the blade airfoil is located at 30% -33% of the chord length of the chord from the leading edge, the maximum thickness of the blade airfoil is 8% -8.5% of the chord length, the maximum curved surface of the blade airfoil is located at 39.5% -42% of the chord length of the chord from the leading edge, and the maximum curved surface of the blade airfoil is 7.9% -8.2% of the chord length.

Further, the maximum thickness of the vane airfoil is 31.2% of the chord length of the chord from the leading edge, the maximum thickness of the vane airfoil is 8.12% of the chord length, the maximum curved surface of the vane airfoil is 40.5% of the chord length of the chord from the leading edge, and the maximum curved surface of the vane airfoil is 8.04% of the chord length.

Further, the chord length of the airfoil at the root part of the fan blade is 32.8mm, and the installation angle of the fan blade is 35.5 degrees.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention reduces the total thickness of the fan by reducing the thickness of the hub, reducing the width and the installation angle of the fan blades, connecting the upper half part of the blade root of the fan blade with the lower part of the side wall of the hub to protrude outside, ensuring that the height of the front edge is not higher than the height of the upper surface of the hub and increasing the number of the fan blades.

2. The fan blade adopts a leading edge sweepback type and adopts an improved wing type, so that the fan blade has an excellent noise reduction effect.

3. According to the invention, the connecting part for transitionally connecting the head part and the tail part by the curved surface is arranged on the side wall of the hub and the root part of the fan blade, so that the side wall of the hub has no dust deposition dead angle, and the fan has no dust deposition and no sundries involved.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

FIG. 1 is a schematic top view of the present invention;

FIG. 2 is a schematic bottom view of the present invention;

FIG. 3 is a schematic perspective view of the present invention;

FIG. 4 is a second schematic perspective view of the present invention;

FIG. 5 is a third schematic perspective view of the present invention;

FIG. 6 is a schematic cross-sectional view of the present invention;

FIG. 7 is a fourth schematic view of a perspective view of the present invention;

FIG. 8 is a second schematic cross-sectional view of the present invention;

FIG. 9 is a schematic view of an airfoil of the present invention;

wherein 1 is a fan blade; 101 is the root of the fan blade; 1011 is the upper part of the root of the fan blade; 1012 is the lower part of the root of the fan blade; 102 is a fan blade head; 2 is a hub; 201 is an annular bulge; 202 is the hub upper surface; 203 is the lower surface of the hub; 3 is a connecting part; 301 is a connecting portion head; 302 is the tail of the connecting part; 4 is the outer ring of the fan blade; 5, folding edges; 6 is the leading edge; 7 is an airfoil profile; 8 is a side edge close to the upper surface of the hub; 9 is the side remote from the upper surface of the hub.

Detailed Description

In order to make the technical means, the original characteristics, the achieved purpose and the efficacy of the invention easy to understand, the invention is further described with reference to the specific drawings.