Cross-flow fan blade and air conditioner

Abstract

This utility model provides a cross-flow fan blade and an air conditioner, relating to the field of air conditioning technology. The cross-flow fan blade includes a fan blade ring plate and cross-flow blades mounted on the fan blade ring plate. The rotation direction of the cross-flow fan blade is configured to be the orientation of the leading edge of the cross-flow blades. The trailing edge mounting angle α1 of the cross-flow blades ranges from 28.9° to 30°, where the trailing edge mounting angle α1 is the angle between the trailing edge extension line of the chord L of the cross-flow blade and the trailing edge radius Rw. The chord L of the cross-flow blade is the line connecting the leading edge vertex and the trailing edge vertex of the cross-flow blade, and the trailing edge radius Rw is the line connecting the trailing edge vertex of the cross-flow blade and the center O of the fan blade. By adjusting the trailing edge mounting angle of the cross-flow blades, the installation tilt of the cross-flow fan blades can be reasonably limited, thereby effectively reducing the pressure instability zone and fluctuation range near the blades, thus eliminating low-frequency noise and improving sound quality.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, specifically to a cross-flow fan blade and an air conditioner. Background Technology

[0002] The cross-flow fan blades of the indoor unit of an air conditioner affect the airflow organization, noise, energy efficiency, and comfort. The blade configuration of the cross-flow fan blades is mainly determined by design parameters such as the installation angle, inlet angle, and outlet angle. Different design parameters affect the chord length, curvature, and work efficiency of the blades on the airflow, which in turn affects the airflow distribution, airflow separation, and wind pressure, ultimately causing changes in sound quality.

[0003] The installation angle, a crucial design parameter, primarily affects the blade tilt. Different tilt angles influence the impact of airflow on the blade's leading edge, the degree of trailing edge vortex shedding, and wind pressure. Currently, the blade installation angle is not optimal, resulting in low-frequency noise from the indoor unit's cross-flow fan blades at low speeds, severely impacting sound quality. Utility Model Content

[0004] The problem solved by this invention is how to eliminate low-frequency noise and improve sound quality.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] In one aspect, this utility model provides a cross-flow fan blade, including a fan blade ring plate and cross-flow blades mounted on the fan blade ring plate. The rotation direction of the cross-flow fan blade is configured to be the orientation of the leading edge of the cross-flow blades. The trailing edge mounting angle α1 of the cross-flow blades is between 28.9° and 30°. The trailing edge mounting angle α1 is the angle between the trailing edge extension line of the chord L of the cross-flow blade and the trailing edge radius Rw. The chord L of the cross-flow blade is the line connecting the leading edge vertex and the trailing edge vertex of the cross-flow blade. The trailing edge radius Rw is the line connecting the trailing edge vertex of the cross-flow blade and the center O of the fan blade.

[0007] The cross-flow fan blade provided in this embodiment is fixed by mounting the cross-flow blade on a fan blade ring plate. The rotation direction of the cross-flow fan blade is the direction of its leading edge. The trailing edge mounting angle α1 of the cross-flow blade ranges from 28.9° to 30°, where α1 is the angle between the trailing edge extension line of the chord L of the cross-flow blade and the trailing edge radius Rw. The chord L of the cross-flow blade is the line connecting the leading edge vertex and the trailing edge vertex of the cross-flow blade, and the trailing edge radius Rw is the line connecting the trailing edge vertex of the cross-flow blade and the center O of the fan blade. By adjusting the trailing edge mounting angle of the cross-flow blade, the installation tilt of the cross-flow fan blade can be reasonably limited, thereby effectively reducing the pressure instability zone and fluctuation range near the blade, thus eliminating low-frequency noise and improving sound quality.

[0008] Furthermore, the trailing edge mounting angle α1 of the cross-flow blade is 29.3°.

[0009] The cross-flow fan blade provided in this embodiment of the present invention can eliminate low-frequency noise to the greatest extent and improve sound quality by accurately limiting the value of the trailing edge installation angle of the blade.

[0010] Furthermore, the inlet angle β1 of the cross-flow blade ranges from 16° to 26°, wherein the inlet angle β1 is the angle between the tangent of the mid-arc line of the cross-flow blade at the leading edge vertex and the perpendicular line to the leading edge radius Rq, and the leading edge radius Rq is the line connecting the leading edge vertex of the cross-flow blade and the center O of the blade.

[0011] The cross-flow fan blade provided in this embodiment of the invention, by limiting the inlet angle β1 of the cross-flow blade within a reasonable range, can mitigate the vortex phenomenon generated by airflow impacting the blade surface, thereby reducing vortex noise. Furthermore, by reasonably limiting the trailing edge installation angle, it can further reduce the pressure instability zone and fluctuation range near the blade, thus eliminating low-frequency noise and improving sound quality. Simultaneously, by limiting the inlet angle β1 of the cross-flow blade within a reasonable range, it can ensure smooth airflow entry, thus guaranteeing the efficiency and airflow of the cross-flow blade.

[0012] Furthermore, the exit angle β2 of the cross-flow blade is between 84° and 94°, wherein the exit angle β2 is the angle between the tangent of the mid-arc line of the cross-flow blade at the tip of the trailing edge and the perpendicular line of the trailing edge radius Rw.

[0013] The cross-flow fan blade provided in this embodiment of the utility model can obtain high static pressure by reasonably limiting the outlet angle of the cross-flow blade. In addition, with reasonable limitation of the trailing edge installation angle and the inlet angle, the pressure instability zone and fluctuation range near the blade can be further reduced, thereby eliminating low-frequency noise and improving sound quality.

[0014] Furthermore, the tilt angle θ1 of the cross-flow blade is between 2.2° and 3.2°, wherein the tilt angle is the angle between the trailing edge of the cross-flow blade and the horizontal plane.

[0015] The cross-flow fan blade provided in this embodiment of the invention, by reasonably limiting the tilt angle of the cross-flow blades, allows the cross-flow blades to be installed at an angle relative to the horizontal plane on the fan blade ring plate. Combined with the reasonable limitation of the trailing edge installation angle and the inlet angle, this further reduces the pressure instability zone and fluctuation range near the blades, thereby eliminating low-frequency noise and improving sound quality. Simultaneously, when the tilt angle of the cross-flow blades is within a reasonable range, it also improves airflow, reduces eddies, and makes the output flow more uniform.

[0016] Furthermore, the cross-flow fan blades are provided on both sides of the fan blade ring plate, and the cross-flow fan blades on both sides of the fan blade ring plate are staggered.

[0017] The cross-flow fan blade provided in this embodiment of the invention, by staggering the cross-flow blades on both sides of the fan blade ring plate, allows for more precise optimization design in the axial dimension. This disrupts the coherence of sound waves, scrambles the phase of noise, and achieves sound pressure cancellation, thereby reducing the peak value of pure tone (i.e., humming sound) and further reducing noise. Simultaneously, it improves the uniformity of airflow distribution in the axial direction, resulting in increased efficiency and stability.

[0018] Furthermore, the misalignment angle θ2 of the cross-flow blade is between -5° and 5°, wherein the misalignment angle is the angle between the line K connecting the endpoints of the leading edges of the two cross-flow blades located on both sides of the wind turbine ring plate and the horizontal plane.

[0019] The cross-flow fan blade provided in this embodiment of the utility model can further optimize the noise reduction effect brought about by the misalignment setting by limiting the misalignment angle of the cross-flow blade within a reasonable range, and at the same time further improve the uniformity of airflow distribution in the axial direction, thereby improving efficiency and stability.

[0020] Furthermore, the diameter of the cross-flow fan blade is in the range of 106mm-122mm.

[0021] The cross-flow fan blade provided in this embodiment of the utility model, by reasonably limiting the fan blade diameter and by reasonably limiting the trailing edge installation angle and the inlet angle, can further reduce the pressure instability zone and fluctuation range near the blade, thereby eliminating low-frequency noise and improving sound quality.

[0022] Furthermore, the length of the cross-flow fan blade is in the range of 550mm-650mm.

[0023] The cross-flow fan blade provided in this embodiment of the utility model, by reasonably limiting the length of the fan blade and by reasonably limiting the trailing edge installation angle and the inlet angle, can further reduce the pressure instability zone and fluctuation range near the blade, thereby eliminating low-frequency noise and improving sound quality.

[0024] On the other hand, the present invention also provides an air conditioner, including the aforementioned cross-flow fan blades. Attached Figure Description

[0025] Figure 1 A cross-sectional schematic diagram of the cross-flow fan blade provided for an embodiment of this utility model; Figure 2 for Figure 1 A magnified view of a section at point II; Figure 3 A partial structural schematic diagram of the cross-flow fan blade provided in an embodiment of this utility model; Figure 4A perspective view of a cross-flow fan blade provided for an embodiment of this utility model; Figure 5 Comparative cross-sectional views of the cross-flow fan blades provided for embodiments and comparative examples of this utility model; Figure 6 This is an exploded SPOD diagram of the cross-flow fan blades of the present invention and comparative examples. Figure 7 Noise waterfall diagram of the cross-flow fan blade provided for embodiments of this utility model; Figure 8 The noise waterfall diagram of the cross-flow fan blade provided as a comparative example of this utility model.

[0026] Explanation of reference numerals in the attached figures: 100 - Cross-flow fan blade; 110 - Fan blade ring plate; 130 - Cross-flow blade; 131 - Leading edge apex; 132 - Trailing edge apex; 133 - Mid-curve; 135 - Trailing edge edge. Detailed Implementation

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0028] See Figures 1 to 4 This utility model provides a cross-flow fan blade 100, which can eliminate low-frequency noise (i.e., low-frequency humming sound), improve sound quality, and enhance the air conditioning user experience.

[0029] The cross-flow fan blade 100 provided in this embodiment includes a fan blade ring plate 110 and a cross-flow blade 130 mounted on the fan blade ring plate 110. The rotation direction of the cross-flow fan blade 100 is configured to be the orientation of the leading edge of the cross-flow blade 130. The value range of the trailing edge mounting angle α1 of the cross-flow blade 130 is between 28.9° and 30°. The trailing edge mounting angle α1 is the angle between the trailing edge extension line of the chord L of the cross-flow blade 130 and the trailing edge radius Rw. The chord L of the cross-flow blade 130 is the line connecting the leading edge vertex 131 and the trailing edge vertex 132 of the cross-flow blade 130. The trailing edge radius Rw is the line connecting the trailing edge vertex 132 of the cross-flow blade 130 and the center O of the fan blade.

[0030] It should be noted that the cross-flow fan blade 100 may include multiple fan blade ring plates 110, which are evenly spaced around the same axis of rotation. Multiple evenly distributed cross-flow blades 130 may be arranged between adjacent fan blade ring plates 110. For the specific structure and working principle of the cross-flow fan blade 100, please refer to existing cross-flow fan blade 100 structures. Here, the fan blade rotation direction of the cross-flow fan blade 100 is the leading edge orientation, i.e., clockwise as shown in the figure. The cross-flow blade 130 is arc-shaped, and its leading edge installation angle α2 is a constant value. The leading edge installation angle α2 is located on one side of the outer diameter of the entire cross-flow fan blade 100 and is the angle between the chord L and the leading edge radius Rq. The leading edge radius Rq is the line connecting the leading edge vertex 131 of the cross-flow blade 130 and the center O of the fan blade. The trailing edge installation angle α1 is located on one side of the inner diameter of the entire cross-flow fan blade 100 and can characterize the installation tilt of the cross-flow blade 130. When the leading edge installation angle α2 is constant, if the trailing edge installation angle α1 increases, the cross-flow blade 130 will tilt in the direction of rotation; if the trailing edge installation angle α1 decreases, the cross-flow blade 130 will tilt in the opposite direction of rotation.

[0031] The cross-flow fan blade 100 provided in this embodiment of the utility model fixes the cross-flow blade 130 on the fan blade ring plate 110, and the rotation direction of the cross-flow fan blade 100 is the direction of the leading edge of the cross-flow blade 130. The trailing edge mounting angle α1 of the cross-flow blade 130 is between 28.9° and 30°, where the trailing edge mounting angle α1 is the angle between the trailing edge extension line of the chord L of the cross-flow blade 130 and the trailing edge radius Rw, the chord L of the cross-flow blade 130 is the line connecting the leading edge vertex 131 and the trailing edge vertex 132 of the cross-flow blade 130, and the trailing edge radius Rw is the line connecting the trailing edge vertex 132 of the cross-flow blade 130 and the center O of the fan blade. By adjusting the trailing edge mounting angle of the cross-flow blade 130, the installation tilt of the cross-flow fan blade 100 can be reasonably limited, thereby effectively reducing the pressure instability zone and fluctuation range near the blade, thus eliminating low-frequency noise and improving sound quality.

[0032] It should also be noted that the trailing edge extension line of the chord L of the cross-flow blade 130 refers to a straight line with the trailing edge vertex 132 as the origin, in the same direction as the chord L and away from the leading edge vertex 131. The blade center O mentioned here refers to a point on the rotation axis of the cross-flow blade 100, and the blade center O, leading edge vertex 131, and trailing edge vertex 132 all refer to points on the same cross section.

[0033] In some embodiments, the trailing edge installation angle α1 of the cross-flow blade 130 is 29.3°. By accurately defining the value of the trailing edge installation angle of the blade, low-frequency noise can be eliminated to the greatest extent and sound quality can be improved.

[0034] In some embodiments, the inlet angle β1 of the cross-flow blade 130 ranges from 16° to 26°, where the inlet angle β1 is the angle between the tangent of the mid-arc line 133 of the cross-flow blade 130 at the leading edge vertex 131 and the perpendicular line to the leading edge radius Rq, and the leading edge radius Rq is the line connecting the leading edge vertex 131 of the cross-flow blade 130 and the center O of the blade circle. By limiting the inlet angle β1 of the cross-flow blade 130 to a reasonable range, the vortex phenomenon generated by the airflow impacting the blade surface can be mitigated, thereby reducing vortex noise. Combined with a reasonable limitation of the trailing edge installation angle, the pressure instability zone and fluctuation range near the blade can be further reduced, thereby eliminating low-frequency noise and improving sound quality. Simultaneously, by limiting the inlet angle β1 of the cross-flow blade 130 to a reasonable range, smooth airflow can be ensured, thus guaranteeing the efficiency and airflow of the cross-flow blade 130.

[0035] It should be noted that the central arc line 133 of the cross-flow blade 130 mentioned in this embodiment refers to the line connecting the centers of the inscribed circles of the cross-sectional shape of the cross-flow blade 130. That is, any point on the central arc line 133 is equidistant from the two side surfaces of the cross-flow blade 130.

[0036] In some embodiments, the exit angle β2 of the cross-flow blade 130 is between 84° and 94°, where the exit angle β2 is the angle between the tangent of the mid-arc line 133 of the cross-flow blade 130 at the trailing edge apex 132 and the perpendicular line to the trailing edge radius Rw. By reasonably limiting the exit angle of the cross-flow blade 130, high static pressure can be obtained. Furthermore, by reasonably limiting the trailing edge mounting angle and the inlet angle, the pressure instability zone and fluctuation range near the blade can be further reduced, thereby eliminating low-frequency noise and improving sound quality.

[0037] In some embodiments, the tilt angle θ1 of the cross-flow blade 130 is between 2.2° and 3.2°, where the tilt angle is the angle between the trailing edge 135 of the cross-flow blade 130 and the horizontal plane. By reasonably limiting the tilt angle of the cross-flow blade 130, the cross-flow blade 130 can be installed at an angle relative to the horizontal plane on the fan ring plate 110. Combined with the reasonable limitation of the trailing edge mounting angle and the inlet angle, the pressure instability zone and fluctuation range near the blade can be further reduced, thereby eliminating low-frequency noise and improving sound quality. Simultaneously, within a reasonable range, the tilt angle of the cross-flow blade 130 can also improve airflow, reduce eddies, and make the outflow more uniform.

[0038] It should be noted that the trailing edge 135 of the cross-flow blade 130 mentioned here refers to the line connecting the apex 132 of the trailing edge of the cross-flow blade 130 along the axial direction, i.e., the blade edge. Of course, the cross-flow blade 130 here is a blade of uniform width, therefore the trailing edge 135 of the cross-flow blade 130 is parallel to the leading edge. The horizontal plane mentioned here refers to the horizontal plane parallel to the axis of rotation of the cross-flow fan blade 100.

[0039] In some embodiments, cross-flow vanes 100 are provided on both sides of the fan blade ring 110, and the cross-flow vanes 130 on both sides of the fan blade ring 110 are staggered. By staggering the cross-flow vanes 130 on both sides of the fan blade ring 110, the cross-flow vanes 130 of adjacent sections can be misaligned, enabling more refined optimization design in the axial dimension, disrupting the coherence of sound waves, scrambling the phase of noise, achieving sound pressure cancellation, thereby reducing the peak value of pure tone (i.e., humming sound), and achieving further noise reduction. At the same time, it can improve the uniformity of airflow distribution in the axial direction, resulting in improved efficiency and stability.

[0040] See Figure 3 and Figure 4 , Figure 4 The dashed line in the diagram indicates the position of the preceding cross-flow blade 130. In some embodiments, the misalignment angle θ2 of the cross-flow blade 130 is between -5° and 5°, where the misalignment angle is the angle between the line K connecting the endpoints of the leading edges of the two cross-flow blades 130 located on both sides of the fan ring plate 110 and the horizontal plane. By limiting the misalignment angle of the cross-flow blade 130 within a reasonable range, the noise reduction effect brought about by the misalignment setting can be further optimized, while the uniformity of airflow distribution in the axial direction can be further improved, resulting in improved efficiency and stability.

[0041] It should be noted that the misalignment angle here can characterize the degree of misalignment of the cross-flow blade 130, that is, the angle of rotation of the subsequent cross-flow blade 130 relative to the previous cross-flow blade 130. From the perspective of the figure, downward deflection is a positive value, and upward deflection is a negative value.

[0042] In some embodiments, the diameter of the cross-flow fan blade 100 ranges from 106mm to 122mm. By reasonably limiting the fan blade diameter, and in conjunction with reasonably limiting the trailing edge mounting angle and the inlet angle, the pressure instability zone and fluctuation range near the blade can be further reduced, thereby eliminating low-frequency noise and improving sound quality.

[0043] In some embodiments, the length of the cross-flow fan blade 100 ranges from 550mm to 650mm. By reasonably limiting the fan blade length, and in conjunction with reasonably limiting the trailing edge installation angle and the inlet angle, the pressure instability zone and fluctuation range near the blade can be further reduced, thereby eliminating low-frequency noise and improving sound quality.

[0044] It should be noted that the blade diameter here refers to the outer diameter of the cross-flow fan blade 100, which in this embodiment can be the outer diameter of the fan blade ring plate 110. The blade length refers to the rotational length of the cross-flow fan blade 100, which in this embodiment can be the length of the cross-flow fan blade 100 in the direction of the rotation axis.

[0045] This utility model also provides an air conditioner, including an air conditioner body and the aforementioned cross-flow fan blade 100. The cross-flow fan blade 100 is assembled in the air conditioner body and includes a fan blade ring plate 110 and cross-flow blades 130 mounted on the fan blade ring plate 110. The rotation direction of the cross-flow fan blade 100 is configured to be the orientation of the leading edge of the cross-flow blade 130. The trailing edge mounting angle α1 of the cross-flow blade 130 ranges from 28.9° to 30°, where the trailing edge mounting angle α1 is the angle between the trailing edge extension line of the chord L of the cross-flow blade 130 and the trailing edge radius Rw. The chord L of the cross-flow blade 130 is the line connecting the leading edge vertex 131 and the trailing edge vertex 132 of the cross-flow blade 130, and the trailing edge radius Rw is the line connecting the trailing edge vertex 132 of the cross-flow blade 130 and the center O of the fan blade circle. Specifically, this air conditioner can be a wall-mounted air conditioner.

[0046] Example See Figures 5 to 7 ,in Figure 5 The dashed line indicates the position of the cross-flow blade 130 in the comparative example. The cross-flow fan blade 100 provided in this embodiment has a blade diameter of 116 mm and a blade length of 620 mm. The trailing edge installation angle of the cross-flow blade 130 is 29.3°, the misalignment angle is -3.3°, the tilt angle is 2.7°, the inlet angle is 24°, and the outlet angle is 92°. The fan blade rotation direction is the leading edge orientation, i.e., the clockwise rotation direction shown in the figure. The trailing edge installation angle characterizes the degree of tilt of the cross-flow blade 130. When the trailing edge installation angle increases, the cross-flow blade 130 will tilt in the direction of rotation; when the trailing edge installation angle decreases, the blade will tilt against the direction of rotation.

[0047] By performing SPOD decomposition and noise waterfall diagram analysis on the cross-flow fan blade 100 under this parameter design (tail edge installation angle of 29.3°), it can be seen that... Figure 6 The SPOD decomposition diagram shows that the pressure instability zone and fluctuation range near the blade at an installation angle of 29.3° are significantly smaller. Figure 7 The noise waterfall plot (measured with a microphone placed 10cm directly below the air conditioner) shows frequency on the horizontal axis and time on the vertical axis (time corresponds to rotational speed). The waterfall plot of the cross-flow fan blade 100 with a trailing edge installation angle of 29.3° shows that there is no order line M near 150Hz (the rated frequency where low-frequency noise is likely to occur). The intensity of the color of this line reflects the noise amplitude. The position of this order line does not change with rotational speed, indicating the absence of humming at this frequency and better sound quality.

[0048] Comparative Example See Figure 5 , Figure 6 and Figure 8The cross-flow fan blade 100 provided in this comparative example has a blade diameter of 116 mm, a blade length of 620 mm, a trailing edge installation angle of 27.2°, a misalignment angle of -3.3°, a tilt angle of 2.7°, an inlet angle of 24°, an outlet angle of 92°, and the blade rotation direction is the leading edge orientation, i.e., the clockwise rotation direction shown in the figure. When this cross-flow fan blade 100 operates at low speed, a noticeable low-frequency humming sound is present.

[0049] By performing SPOD decomposition and noise waterfall diagram analysis on the cross-flow fan blade 100 under this parameter design (tail edge installation angle of 27.2°), it can be seen that... Figure 6 The SPOD decomposition diagram shows that the pressure instability zone and fluctuation range near the blade at an installation angle of 27.2° are significantly larger. Figure 8 The noise waterfall plot (measured with a microphone placed 10cm directly below the air conditioner) shows frequency on the horizontal axis and time on the vertical axis (time corresponds to rotational speed). The waterfall plot of the cross-flow fan blade 100 with a trailing edge installation angle of 27.2° shows a darker order line near 150Hz (the darkness of the color reflects the magnitude of the noise). The position of this order line does not change with rotational speed, indicating a humming sound at this frequency and poorer sound quality.

[0050] In summary, SPOD decomposition and waterfall diagram analysis of cross-flow fan blades 100 with trailing edge installation angles of 26.3° to 30° show that, under the premise of ensuring that air volume, noise and other design parameters (inlet angle, outlet angle, tilt angle, etc.) are within the limits, blades with installation angles of 28.9° to 30° can achieve the purpose of eliminating low-speed humming noise and effectively improve the sound quality during use.

[0051] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A cross-flow fan blade, characterized in that, The device includes a fan blade ring plate (110) and a cross-flow blade (130) mounted on the fan blade ring plate (110). The rotation direction of the cross-flow blade is configured to be the orientation of the leading edge of the cross-flow blade (130). The value of the trailing edge mounting angle α1 of the cross-flow blade (130) is between 28.9° and 30°. The trailing edge mounting angle α1 is the angle between the trailing edge extension line of the chord L of the cross-flow blade (130) and the trailing edge radius Rw. The chord L of the cross-flow blade (130) is the line connecting the leading edge vertex (131) and the trailing edge vertex (132) of the cross-flow blade (130). The trailing edge radius Rw is the line connecting the trailing edge vertex (132) of the cross-flow blade (130) and the center O of the fan blade.

2. The cross-flow fan blade according to claim 1, characterized in that, The trailing edge mounting angle α1 of the cross-flow blade (130) is 29.3°.

3. The cross-flow fan blade according to claim 1 or 2, characterized in that, The inlet angle β1 of the cross-flow blade (130) ranges from 16° to 26°, wherein the inlet angle β1 is the angle between the tangent of the middle arc line (133) of the cross-flow blade (130) at the leading edge vertex (131) and the perpendicular line of the leading edge radius Rq, and the leading edge radius Rq is the line connecting the leading edge vertex (131) of the cross-flow blade (130) and the center O of the blade.

4. The cross-flow fan blade according to claim 3, characterized in that, The exit angle β2 of the cross-flow blade (130) is between 84° and 94°, wherein the exit angle β2 is the angle between the tangent of the middle arc line (133) of the cross-flow blade (130) at the trailing edge vertex (132) and the perpendicular line of the trailing edge radius Rw.

5. The cross-flow fan blade according to claim 1 or 2, characterized in that, The tilt angle θ1 of the cross-flow blade (130) is between 2.2° and 3.2°, wherein the tilt angle is the angle between the trailing edge (135) of the cross-flow blade (130) and the horizontal plane.

6. The cross-flow fan blade according to claim 1 or 2, characterized in that, The cross-flow blades (130) are provided on both sides of the wind turbine ring plate (110), and the cross-flow blades (130) on both sides of the wind turbine ring plate (110) are staggered.

7. The cross-flow fan blade according to claim 6, characterized in that, The misalignment angle θ2 of the cross-flow blade (130) is between -5° and 5°, wherein the misalignment angle is the angle between the line K connecting the endpoints of the leading edges of the two cross-flow blades (130) located on both sides of the wind turbine ring plate (110) and the horizontal plane.

8. The cross-flow fan blade according to claim 1 or 2, characterized in that, The diameter of the cross-flow fan blades ranges from 106mm to 122mm.

9. The cross-flow fan blade according to claim 1, characterized in that, The length of the cross-flow fan blades ranges from 550mm to 650mm.

10. An air conditioner, characterized in that, Including the cross-flow fan blade as described in any one of claims 1-9.

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