High-circulation low-noise axial flow blade

Abstract

The high-circulation low-noise axial flow blade comprises a wing-shaped body, a blade tip, a blade root, a wind cutting face and a windward face are arranged on the wing-shaped body, the wind cutting face is bent from bottom to top and from outside to inside, the windward face is bent from bottom to top and from inside to outside, and the wing-shaped body is recessed in an arc shape from inside to outside. The thickness of the wing-shaped body is gradually reduced from the wind cutting face to the windward face, the width of the wing-shaped body is gradually increased from the blade root to the blade tip, the blade root is connected with a connecting part, the connecting part is close to the first connecting end, the first connecting end is located on the radial line of the connecting part, and the second connecting end is located on the inner side of the radial line of the connecting part. According to the utility model, the air flow rate can be improved, the noise can be reduced, and the connected hub can be cooled.

Description

Technical Field

[0001] The utility model relates to the field of axial flow fans, in particular to an axial flow blade with high flow and low noise. Background Art

[0002] In most situations where ventilation is required, axial flow fans are required to ventilate the internal and external environments. Axial flow fans are generally composed of a hub, a motor and axial flow blades. The axial flow blades are evenly distributed on the circumference of the hub. The hub is connected to the output shaft of the motor. The motor drives the hub to rotate, and the axial flow blades on the hub also rotate together. When the axial flow blades rotate, the gas enters axially from the air inlet, and the energy of the gas is increased by the push of the axial flow blades. The axial flow blades deflect the airflow into axial flow, and at the same time introduce the gas into the diffuser, further converting the kinetic energy of the gas into pressure energy, and finally introducing it into the corresponding environment or pipeline.

[0003] The axial flow blades currently on the market have a smooth transition between the windward side and the tangential side of the blade body, which will cause the boundary layer of the airflow on the surface of the axial flow blade to be too thin, thereby reducing the viscous resistance and eddy loss of the airflow. At the same time, it may also weaken the driving force of the axial flow blade on the airflow, thereby increasing the flow loss of the axial flow fan and reducing the air volume. Moreover, when the smoothly transitioned blade body rotates at high speed, the boundary layer separation of the airflow on the blade surface will form an asymmetric wake at the blade root, thereby inducing vortices, which will cause greater noise. Utility Model Content

[0004] The utility model aims to provide a high-flow and low-noise axial flow blade which can reduce noise and increase airflow rate.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a high-flow and low-noise axial flow blade, comprising: an airfoil body, a blade tip and a blade root are respectively arranged at the top and bottom of the airfoil body, a tangential surface and a windward surface are respectively arranged at the left and right ends of the airfoil body, the tangential surface and the windward surface are both connected to the blade tip and the blade root, the tangential surface is curved from bottom to top and from outside to inside, the windward surface is curved from bottom to top and from inside to outside, the first connection end intersecting between the tangential surface and the blade root is outside than the second connection end intersecting between the windward surface and the blade root, and the intersection between the tangential surface and the blade tip is The third connection end is closer to the inside than the fourth connection end intersecting between the windward surface and the blade tip, the third connection end is closer to the inside than the second connection end, the second connection end is closer to the inside than the first connection end, the inner end of the first connection end is aligned with the outer end of the fourth connection end up and down, the airfoil body is arc-shaped and concave from the inside to the outside, the thickness of the airfoil body gradually becomes thinner from the wind-cutting surface to the windward surface, and the width of the airfoil body gradually becomes wider from the blade root to the blade tip, a connection portion is connected to the blade root, the connection portion is close to the first connection end, the first connection end is located on the radial line of the connection portion, and the second connection end is located on the inner side of the radial line of the connection portion.

[0006] Furthermore, in the aforementioned high-flow, low-noise axial flow blade, the arc length L1 of the windward surface is 367±0.5 mm, the arc α1 is 1.6±0.03 rad, and the arc length L2 of the wind-cutting surface is 344±1 mm, and the arc α2 is 1.1±0.05 rad.

[0007] Furthermore, in the aforementioned high-flow and low-noise axial flow blade, the thickness H1 of the windward surface is 2±0.3 mm, and the thickness H2 of the wind-cutting surface is 5±0.5 mm.

[0008] Furthermore, in the aforementioned high-flow, low-noise axial flow blade, the width W1 of the blade tip is 195±1mm, the width W2 of the blade root is 85±1mm, the arc length L3 of the inner concave surface of the blade tip is 196±0.5mm, the arc α3 is 0.46±0.003rad, and the arc length L4 of the outer convex surface of the blade tip is 195±0.5mm, and the arc α4 is 0.45±0.003rad.

[0009] Furthermore, in the aforementioned high-flow and low-noise axial flow blade, an angle n between the first connecting end and the second connecting end with the center of the connecting plate as the intersection point is 141±0.5°.

[0010] Furthermore, in the aforementioned high-flow, low-noise axial flow blade, the blade tip, blade root, wind-cutting surface and windward surface are all connected to the airfoil body through a smooth arc transition, the first connecting end and the second connecting end are at an angle, and the third connecting end and the fourth connecting end are smooth arcs.

[0011] Furthermore, in the aforementioned high-flow, low-noise axial flow blade, the connecting portion and the blade root are integrally die-cast, the connecting portion and the airfoil body are transitionally connected by a smooth arc surface, and the second connecting end is closer to the inside than the smooth arc surface.

[0012] The advantages of the utility model are: the left end of the blade tip is pressed inward, the right end is upright outward, and the left and right ends are curved in arcs, the wind-cutting surface is upward and inwardly inclined, and the windward surface is upward and outwardly erected. Firstly, this design can effectively reduce the tip leakage flow, reduce the blade blockage caused by the tip leakage flow, and thus improve the flow capacity of the airflow. Tip leakage flow is an important obstacle to turbine efficiency because it reduces turbine efficiency and increases total aerodynamic losses. Secondly, by changing the shape of the axial flow blades, the airflow vortex structure can be optimized, reducing energy loss and noise caused by the vortex. In addition, this design also helps to prevent the stall of the blade root or blade tip, which may cause greater energy loss and noise. Therefore, preventing blade tip stall can improve fan efficiency and extend service life. Arrangement of arc grooves on the airfoil body can effectively reduce the surface pressure of the axial flow blades, and can also improve the flow state of the airflow on the axial flow blades, thereby reducing wind resistance and noise. When the axial flow blades of this shape are assembled on the hub, an inwardly concave arc surface will be formed on the outside of the hub, which can generate greater air volume and resistance during rotation. The air volume generated by rotation is farther away, and the sound is also small. In addition, the arc grooves on the airfoil body can guide part of the airflow to the second connection end between the blade root and the windward surface, and the second connection end guides the airflow to the connection part connected to the hub to cool the hub. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a high-flow and low-noise axial flow blade in the main viewing direction described in the utility model.

[0014] Figure 2 yes Figure 1 Schematic diagram of the structure from the top view.

[0015] Figure 3 yes Figure 1 Schematic diagram of the structure looking upward.

[0016] Figure 4 yes Figure 1 Schematic diagram of the structure from the center left viewing direction. DETAILED DESCRIPTION

[0017] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and preferred embodiments.

[0018] like Figure 1 to Figure 4As shown, a high-flow and low-noise axial flow blade described in the utility model comprises: an airfoil body 1, a blade tip 11 and a blade root 12 are respectively arranged at the top and bottom of the airfoil body 1, and a wind-cutting surface 13 and a windward surface 14 are respectively arranged at the left and right ends of the airfoil body 1. The blade tip 11, the blade root 12, the wind-cutting surface 13 and the windward surface 14 are connected to the airfoil body 1 through a smooth arc transition. On the one hand, it helps to reduce the friction resistance and energy damage of the airflow during the flow process, optimize the flow performance of the airflow, make the airflow smooth and smooth when flowing through the axial flow blade, and reduce the resistance and noise generated by the airflow flow. On the other hand, it can ensure that the shape change of the axial flow blade will not be too drastic during the design, which not only improves the strength and rigidity of the axial flow blade, but also improves the stability of the axial flow blade when rotating at high speed.

[0019] The wind-cutting surface 13 and the windward surface 14 are both connected to the blade tip 11 and the blade root 12. The wind-cutting surface 13 is curved from bottom to top and from outside to inside, and the windward surface 14 is curved from bottom to top and from inside to outside. The airfoil body 1 is arc-shaped and concave from inside to outside. The first connection end 2 intersecting between the wind-cutting surface 13 and the blade root 12 is outside than the second connection end 3 intersecting between the windward surface 14 and the blade root 12. The third connection end 4 intersecting between the wind-cutting surface 13 and the blade tip 11 is inside than the fourth connection end 5 intersecting between the windward surface 14 and the blade tip 11. The third connection end 4 is inside than the fourth connection end 5 intersecting between the windward surface 14 and the blade tip 11. The second connecting end 3 is close to the inside. In this embodiment, the arc length L2 of the wind-cutting surface 13 is 344±1mm, the arc α2 is 1.1±0.05rad, the arc length L1 of the windward surface 14 is 367±0.5mm, the arc α1 is 1.6±0.03rad, the thickness H1 of the windward surface 14 is 2±0.3mm, the thickness H2 of the wind-cutting surface 13 is 5±0.5mm, the width W1 of the blade tip 11 is 195±1mm, the width W2 of the blade root 12 is 85±1mm, and the arc length L3 of the concave surface of the blade tip 11 is 196± The blade tip 11 is 0.5 mm, the arc α3 is 0.46 ± 0.003 rad, the arc length L4 of the outer convex surface of the blade tip 11 is 195 ± 0.5 mm, the arc α4 is 0.45 ± 0.003 rad, the second connection end 3 is closer to the inside than the first connection end 2, and the inner end of the first connection end 2 is aligned with the outer end of the fourth connection end 5 up and down. The left end of the blade tip 11 designed in this way is pressed inward, the right end is straight outward, and the left and right ends are curved in arcs, the wind-cutting surface 13 is tilted inward upward, and the windward surface 14 is straightened outward upward, and the blade tip 11, the wind-cutting surface 13 and the windward surface 14 are located at the same time. The airfoil body 1 between the wind surfaces 14 is arc-shaped and concave from the inside to the outside and can ensure that the arc-shaped concave part of the airfoil body 1 is close to the blade root. When the airfoil body 1 pushes the airflow, the wind-cutting surface 13 cuts the airflow and guides part of the airflow into the inner wall of the airfoil body 1. The arc-shaped concave on the airfoil body 1 will receive the airflow, most of the airflow will move toward the blade tip 11, and a small part of the airflow will move toward the blade root 12. When the airflow that moves to the blade root 12 reaches the second connecting end 3, the second connecting end 3 guides the airflow.

[0020] The first connection end 2 and the second connection end 3 form an angle, and the third connection end 4 and the fourth connection end 5 are smooth arcs. The first connection end 2 and the second connection end 3 are designed to form an angle that can realize the connection rotation bending of the wind-cutting surface 13 and the windward surface 14 under different axis conditions, and reliably transmit torque and motion, reduce the bending stress caused by the centrifugal force of the axial flow blade under high-speed rotation, and also have a large angular compensation ability, improve the transmission efficiency of the axial flow blade, and the third connection end 4 and the fourth connection end 5 are designed to be smooth arcs. When cutting and guiding the airflow, it can prevent the axial flow blade from shaking, thereby reducing the noise during operation. The wind-cutting surface 13 can increase the static pressure value of the airfoil body 1 when cutting the airflow. After the static pressure value is increased, the velocity distribution of the airflow on the surface of the axial flow blade can be more uniform, thereby reducing the friction and local resistance of the airflow. When the axial flow blade is installed on the axial flow fan, the flow range of the axial flow fan can be expanded, so that more airflow can be driven through the axial flow fan to increase the air volume of the axial flow fan.

[0021] The thickness of the airfoil body 1 gradually becomes thinner from the wind-cutting surface 13 to the windward surface 14. The thick wind-cutting surface 13 can withstand greater pressure and better maintain the structural stability of the axial flow blade, while the thin windward surface 14 can reduce resistance and improve the efficiency of airflow. The width of the airfoil body 1 gradually becomes wider from the blade root 12 to the blade tip 11. The blade root 12 generally needs to be connected and the pressure borne by the blade root 12 is relatively small. The narrow blade root 12 will not affect the flow of airflow, and can also improve the connection stability of the axial flow blade, while the airflow pressure borne by the blade tip 11 is relatively large. The wider blade tip 11 can withstand greater pressure and can prevent the airflow from generating turbulence at the blade tip 11. A connecting portion 6 is connected to the blade root 12, and the connecting portion 6 is close to the first connecting end 2, and the first connecting end 2 is located at the connecting On the radial line of the connecting portion 6, the second connecting end 3 is located on the inner side of the radial line of the connecting portion 6, the angle n between the first connecting end 2 and the second connecting end 3 with the center of the connecting portion 6 as the intersection point is 141±0.5°, the connecting portion 6 and the blade root 12 are integrally die-cast, and the connecting portion 6 and the airfoil body 1 are transitionally connected by a smooth arc surface, the second connecting end 3 is closer to the inside than the smooth arc surface, the blade root 12 is connected to the hub through the connecting portion 6, and the airflow in the arc-shaped groove of the airfoil body 1 can smoothly pass through the smooth arc surface between the connecting portion 6 and the airfoil body 1 to reach the second connecting end 3 when flowing, and then the second connecting end 3 guides the airflow to the hub to cool the hub, and the smooth flow of the airflow can reduce wind noise and prevent airflow turbulence at the blade root 12.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the utility model should be covered within the scope of protection of the claims of the utility model.

Claims

1. A high-flow, low-noise axial flow blade, comprising: The airfoil body has a blade tip and a blade root respectively arranged at the top and bottom of the airfoil body, and a tangential surface and a windward surface are respectively arranged at the left and right ends of the airfoil body, and the tangential surface and the windward surface are both connected to the blade tip and the blade root, and the characteristics are as follows: the tangential surface is curved from bottom to top and from outside to inside, and the windward surface is curved from bottom to top and from inside to outside, and the first connection end intersecting between the tangential surface and the blade root is closer to the outside than the second connection end intersecting between the windward surface and the blade root, and the third connection end intersecting between the tangential surface and the blade tip is closer to the outside than the third connection end intersecting between the windward surface and the blade tip. The fourth connecting end of the intersection is closer to the inside, the third connecting end is closer to the inside than the second connecting end, the second connecting end is closer to the inside than the first connecting end, the inner end of the first connecting end is aligned with the outer end of the fourth connecting end, the airfoil body is arc-shaped and concave from the inside to the outside, the thickness of the airfoil body gradually becomes thinner from the wind-cutting surface to the windward surface, and the width of the airfoil body gradually becomes wider from the blade root to the blade tip. A connecting part is connected to the blade root, the connecting part is close to the first connecting end, the first connecting end is located on the radial line of the connecting part, and the second connecting end is located on the inner side of the radial line of the connecting part.

2. The high flow and low noise axial flow blade according to claim 1, characterized in that: The arc length L1 of the windward surface is 367±0.5 mm, and the arc α1 is 1.6±0.03 rad. The arc length L2 of the windward surface is 344±1 mm, and the arc α2 is 1.1±0.05 rad.

3. The high flow and low noise axial flow blade according to claim 2, characterized in that: The thickness H1 of the windward surface is 2±0.3 mm, and the thickness H2 of the windward surface is 5±0.5 mm.

4. The high flow and low noise axial flow blade according to claim 3, characterized in that: The width W1 of the blade tip is 195±1mm, the width W2 of the blade root is 85±1mm, the arc length L3 of the inner concave surface of the blade tip is 196±0.5mm, the arc α3 is 0.46±0.003rad, the arc length L4 of the outer convex surface of the blade tip is 195±0.5mm, and the arc α4 is 0.45±0.003rad.

5. The high flow and low noise axial flow blade according to claim 4, characterized in that: An angle n between the first connection end and the second connection end with the center of the connection plate as the intersection point is 141±0.5°.

6. A high flow and low noise axial flow blade according to any one of claims 1 to 5, characterized in that: The blade tip, blade root, wind-cutting surface and windward surface are all connected to the airfoil body through smooth arc transitions. The first connection end and the second connection end form an included angle, and the third connection end and the fourth connection end are smooth arcs.

7. A high flow and low noise axial flow blade according to any one of claims 1 to 5, characterized in that: The connecting portion and the blade root are integrally die-cast, and the connecting portion and the airfoil body are transitionally connected via a smooth cambered surface, and the second connecting end is closer to the inside than the smooth cambered surface.

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