CN217129853U

CN217129853U - Axial flow fan and axial flow fan blade thereof

Info

Publication number: CN217129853U
Application number: CN202220232858.0U
Authority: CN
Inventors: 高文铭; 洪银川; 柴水华; 韩小红; 周会中
Original assignee: Ningbo Langdi Impeller Machinery Co Ltd
Current assignee: Ningbo Langdi Impeller Machinery Co Ltd
Priority date: 2022-01-27
Filing date: 2022-01-27
Publication date: 2022-08-05
Anticipated expiration: 2032-01-27

Abstract

The utility model relates to a fan blade field especially relates to an axial fan and axial fan blade thereof. The axial flow fan blade comprises a hub and a plurality of axial flow blades which are regularly arranged on the outer side wall of the hub along the circumferential direction; the outer edge of the axial flow blade is flanged from the pressure surface to the back pressure surface to obtain a blade winglet, and the blade winglet forms a windshield at least at the outer edge of the back pressure surface of the axial flow blade. The blade winglets in the axial-flow fan can separate the air flow of the pressure surface and the back pressure surface of the blade, so that the air flow of the pressure surface does not flee to the back pressure surface from the induced draft ring, the work doing efficiency is improved, the air quantity is improved, and the vortex noise is reduced.

Description

Axial flow fan and axial flow fan blade thereof

Technical Field

The utility model relates to a fan blade field especially relates to an axial fan and axial fan blade thereof.

Background

The axial flow fan has a very wide application, namely, the axial flow fan and the fan blade have the same direction of air flow, such as an electric fan, and an air conditioner outer machine fan is an axial flow type running fan. The "axial flow" is so called because the gas flows parallel to the fan axis. The traditional axial flow fan blade can refer to the Chinese prior patent text, and the publication number is 'CN 104005992A', and comprises a hub and a blade, and is characterized in that: the hub is the tube-shape, is provided with the first terminal surface of the bulge that more than two extend to keeping away from hub body direction and is provided with the second terminal surface with the block portion that the bulge corresponds on the body, and the bulge is along using hub's center as the centre of a circle, and the length that uses less than or equal to hub's radius is radial circumference evenly distributed.

As shown in the attached drawings, the whole blade is in a sheet shape, and when the fan blade rotates, airflow on the pressure surface of the blade is easy to jump to the back pressure surface in the induced air ring, so that the whole air volume of the fan blade is reduced, and the noise is large. In addition, the vibration and the axial deformation amplitude of the blade tip part of the axial flow fan blade are large in the rotating process, so that the noise of the whole machine is large, and the air volume of the whole machine is greatly reduced.

Disclosure of Invention

In order to solve the above problem, an object of the utility model is to provide an axial fan blade, the blade winglet in this axial fan blade can separate the air current of blade pressure surface and backpressure face, makes the air current of pressure surface not scurry the backpressure face from the induced air circle to promote the work efficiency, promote the amount of wind, reduce the vortex noise.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the axial flow fan blade comprises a hub and a plurality of axial flow blades which are regularly arranged on the outer side wall of the hub along the circumferential direction; the method is characterized in that: the outer edge of the axial flow blade is flanged from the pressure surface to the back pressure surface to obtain a blade winglet, and the blade winglet forms a windshield at least at the outer edge of the back pressure surface of the axial flow blade.

The above technical scheme is adopted in the utility model, this technical scheme relates to an axial fan blade, and the multi-disc axial fan blade is arranged to the wheel hub circumference rule of this axial fan blade, and the motor shaft is connected inside the axle sleeve at wheel hub center. On the basis, the outer edge of the axial flow blade is turned up from the pressure surface to the back pressure surface to obtain the blade winglet, and the blade winglet forms a windshield on the outer edge of the back pressure surface of the axial flow blade. Therefore, when the fan blade rotates, the blade winglet can separate the airflow of the pressure surface and the airflow of the back pressure surface of the blade, so that the airflow of the pressure surface does not flee to the back pressure surface from the induced draft ring, the acting efficiency is improved, the air volume is improved, and the vortex noise is reduced.

In a further aspect, the leading end of the blade winglet extends onto the leading edge of the axial flow blade and the trailing end of the blade winglet extends onto the trailing edge of the axial flow blade. The leading end of the blade winglet extends over the leading edge and the trailing end extends over the trailing edge; therefore, the axial flow blade integrally covers the outer edge of the axial flow blade, the strength of the outer edge of the axial flow blade is improved, the strength of the blade tip parts at the front end and the rear end of the blade is also improved, the vibration resistance and the axial deformation resistance of the blade tip parts are improved, and the noise of the whole machine is ensured to be low.

In a further aspect, the leading end of the winglet is a ramp or camber that gradually tapers upwardly from the leading edge to the trailing edge. In this solution, the leading end of the winglet is designed as a bevel or camber, so that the wind resistance is relatively low when the blade rotates.

Preferably, the joint of the outer edge of the pressure surface of the axial flow blade and the winglet of the blade is an arc surface, and the arc shape under the structure has low disturbance on airflow flow and low noise.

Preferably, the ratio of the height of the blade winglet to the diameter of the fan blade is 5% -13%.

Preferably, the hub center is provided with a shaft sleeve connected with a motor shaft of the driving motor, the outer side wall of the shaft sleeve is provided with a plurality of shaft sleeve reinforcing ribs connected with the end face of the hub, and the plurality of shaft sleeve reinforcing ribs are regularly arranged along the outer side wall of the shaft sleeve at equal circle center angles. In this scheme, the support intensity of axle sleeve can be promoted in the setting of axle sleeve strengthening rib.

Preferably, the shaft sleeve is provided with a shaft hole for penetrating a motor shaft at the center, and the periphery of the shaft hole forms a side wall with equal thickness based on the shape of the shaft hole; the inner side wall of the shaft hole at least comprises two linear sections which are not on the same circumferential line. In this embodiment, the inner sidewall defining the axial hole includes at least two linear segments that are not on the same circumferential line, i.e. the axial hole is a non-circular axial hole. Based on the requirement, the hole type of the shaft hole is more selectable.

In a specific embodiment, the cross section of the shaft hole is in a D shape, and the shaft sleeve forms a D-shaped equal-thickness side wall on the periphery of the shaft hole.

In the scheme, the hub is provided with the shaft sleeve for being connected with a motor shaft of the driving motor, and the shaft hole in the shaft sleeve at least comprises two linear sections which are not on the same circumferential line, namely the shaft hole is in a shape of a non-complete perfect circle, so that the motor shaft and the shaft sleeve can be positioned in the circumferential direction to prevent circumferential slipping. Furthermore, the shaft sleeve forms a side wall with equal thickness based on the shape of the shaft hole at the periphery of the shaft hole. The fan blade has the advantages that the wall thickness of the shaft hole is equal in thickness, the sunken deformation of the shaft hole is avoided when the fan blade is subjected to injection molding, the matching precision of the fan blade and a motor shaft is improved, the running shake of the whole machine is reduced, and the running noise is reduced.

The utility model provides an axial fan, includes motor and axial fan blade, its characterized in that: the axial flow fan blade is the axial flow fan blade.

Drawings

Fig. 1 is a schematic structural view of an axial-flow fan blade related to the invention.

Fig. 2 is an enlarged view of a portion a of fig. 1.

Fig. 3 is an axial schematic view of an axial-flow fan blade.

Fig. 4 is a cross-sectional view of an axial-flow fan blade.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1:

as shown in fig. 1 to 4, the embodiment relates to an axial flow fan blade, which includes a hub 1 and a plurality of axial flow blades 2 regularly arranged on the outer side wall of the hub 1 along the circumferential direction. The outer edge 203 of the axial flow blade 2 is flanged from the pressure surface 201 to the back pressure surface 202 to obtain the blade winglet 21, and the blade winglet 21 at least forms a windshield on the outer edge 203 of the back pressure surface 202 of the axial flow blade 2. The technical scheme relates to an axial flow fan blade, wherein a hub 1 of the axial flow fan blade is circumferentially and regularly provided with a plurality of axial flow blades 2, and a motor shaft is connected inside a shaft sleeve in the center of the hub 1. On the basis, the outer edge 203 of the axial flow blade 2 of the present embodiment is turned up from the pressure surface 201 toward the back pressure surface 202 to obtain the blade winglet 21, and the blade winglet 21 forms a damper on the outer edge 203 of the back pressure surface 202 of the axial flow blade 2. Therefore, when the fan blade rotates, the blade winglet 21 can separate the airflow of the pressure surface 201 and the airflow of the back pressure surface of the blade, so that the airflow of the pressure surface 201 cannot flow to the back pressure surface from the induced draft ring, the work doing efficiency is improved, the air volume is improved, and the vortex noise is reduced.

In the schemes shown in fig. 3 and 4, the ratio of the height H of the winglet 21 to the diameter D of the fan blade is 5-13%. The joint of the outer edge 203 of the pressure surface 201 of the axial flow blade 2 and the blade winglet 21 is an arc surface, and the arc shape has lower disturbance on airflow flow and lower noise under the structure. The front end of the blade winglet 21 extends to the leading edge of the axial flow blade 2, and the rear end of the blade winglet 21 extends to the trailing edge of the axial flow blade 2. The leading end of the blade winglet 21 extends over the leading edge 204 and the trailing end extends over the trailing edge 205. Therefore, the outer edge 203 of the axial flow blade 2 is integrally covered, the strength of the outer edge 203 of the axial flow blade 2 is improved, and the strength of the blade tip parts at the front end and the rear end of the blade is also improved, so that the vibration resistance and the axial deformation resistance of the blade tip parts are improved, and the noise of the whole machine is ensured to be low. In a further aspect, the leading end of the blade winglet 21 is beveled or curved in a gradual upward progression from the leading edge 204 to the rear. In this embodiment, the leading end of the blade winglet 21 is configured as a bevel or camber so that the wind resistance is relatively low when the blade rotates.

In a further scheme, a shaft sleeve 11 used for being connected with a motor shaft of a driving motor is arranged at the center of the hub 1, a plurality of shaft sleeve reinforcing ribs 12 connected with the end face of the hub 1 are arranged on the outer side wall of the shaft sleeve 11, and the plurality of shaft sleeve reinforcing ribs 12 are regularly arranged along the outer side wall of the shaft sleeve 11 at equal circle center angles. In this scheme, the arrangement of the shaft sleeve reinforcing ribs 12 can improve the supporting strength of the shaft sleeve 11. As shown in fig. 3, a shaft hole for passing the motor shaft is provided at the center of the shaft sleeve 11, and the shaft sleeve 11 forms a sidewall with an equal thickness based on the shape of the shaft hole at the periphery of the shaft hole. The inner side wall of the shaft hole at least comprises two linear sections which are not on the same circumferential line. In this embodiment, the inner sidewall defining the axial hole includes at least two linear segments that are not on the same circumferential line, i.e. the axial hole is a non-circular axial hole. Based on the requirement, the hole type of the shaft hole can be selected more. In a specific embodiment, the cross section of the shaft hole is in a D shape, and the shaft sleeve 11 forms a side wall with the same thickness as the D shape on the periphery of the shaft hole. In the above solution, the hub 1 is provided with the shaft sleeve 11 for connecting with the motor shaft of the driving motor, and the shaft hole of the shaft sleeve 11 at least includes two linear sections that are not on the same circumferential line, that is, the shaft hole is in a shape of a non-perfect circle, so that the circumferential positioning between the motor shaft and the shaft sleeve 11 can prevent the circumferential slipping. Further, the boss 11 is formed with a side wall of an equal thickness based on the shape of the shaft hole in the periphery of the shaft hole. The wall thickness of the shaft hole can be equal, the sunken deformation of the shaft hole is avoided when the fan blade is used for injection molding, the matching precision of the fan blade and a motor shaft is improved, the running shake of the whole machine is reduced, and the running noise is reduced.

Example 2:

the embodiment relates to an axial flow fan, which comprises a motor and axial flow fan blades, wherein the axial flow fan blades are as described in embodiment 1.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.

Claims

1. An axial flow fan blade comprises a hub (1) and a plurality of axial flow fan blades (2) regularly arranged on the outer side wall of the hub (1) along the circumferential direction; the method is characterized in that: the outer edge (203) of the axial flow blade (2) is flanged from the pressure surface (201) to the back pressure surface (202) to obtain a blade winglet (21), and the blade winglet (21) at least forms a windshield on the outer edge (203) of the back pressure surface (202) of the axial flow blade (2).

2. The axial flow fan blade of claim 1, wherein: the front end of the blade winglet (21) extends to the front edge (204) of the axial flow blade (2), and the rear end of the blade winglet (21) extends to the rear edge (205) of the axial flow blade (2).

3. The axial flow fan blade of claim 2, wherein: the front end part of the blade winglet (21) is a slope or a cambered surface gradually changing upwards from the front edge (204) to the back.

4. The axial flow fan blade of claim 1, wherein: the joint of the outer edge (203) of the pressure surface (201) of the axial flow blade (2) and the winglet (21) is an arc surface.

5. The axial flow fan blade of claim 1, wherein: the ratio of the height of the blade winglet (21) to the diameter of the fan blade is 5-13%.

6. The axial flow fan blade of claim 1, wherein: the hub is characterized in that a shaft sleeve (11) used for being connected with a motor shaft of a driving motor is arranged at the center of the hub (1), a plurality of shaft sleeve reinforcing ribs (12) connected with the end face of the hub (1) are arranged on the outer side wall of the shaft sleeve (11), and the plurality of shaft sleeve reinforcing ribs (12) are regularly arranged along the outer side wall of the shaft sleeve (11) at equal circle center angles.

7. The axial flow fan blade of claim 6, wherein: the center of the shaft sleeve (11) is provided with a shaft hole for the motor shaft to penetrate through, and the periphery of the shaft hole of the shaft sleeve (11) forms a side wall with equal thickness based on the shape of the shaft hole; the inner side wall of the shaft hole at least comprises two linear sections which are not on the same circumferential line.

8. The axial flow fan blade of claim 7, wherein: the cross section of the shaft hole is D-shaped, and the shaft sleeve (11) forms a D-shaped equal-thickness side wall at the periphery of the shaft hole.

9. The utility model provides an axial fan, includes motor and axial fan blade, its characterized in that: the axial flow fan blade is as claimed in any one of claims 1 to 8.