Oblique twist flow fan blade and air conditioner

Abstract

The embodiment of the application provides a skew-torque cross-flow fan blade and an air conditioner, and relates to the technical field of air conditioners. The air conditioner comprises a skew-torque cross-flow fan blade, and the skew-torque cross-flow fan blade comprises a blade. A flow channel groove is arranged at the suction surface of the blade, and the length of the flow channel groove extends to the edge of an outlet angle along the circumference of the blade. The flow channel groove can reduce the proportion of the fan blade area of the blade on the entire circumferential flow channel, improve the air volume of the skew-torque cross-flow fan blade, reduce the flow wake area generated when the blade flows out, reduce noise, and reduce the material cost of the skew-torque cross-flow fan blade.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to a skew-twist cross-flow fan blade and an air conditioner. BACKGROUND

[0002] The cross-flow fan blade is a common air supply mechanism for an air conditioner indoor unit, and has the characteristics of compact structure and low noise. Compared with the commonly used straight-blade cross-flow fan blade, the skew-twist cross-flow fan blade has the advantages of low noise value and good sound quality, but its manufacturing process and processing cost are higher.

[0003] In the case of the same specification size, the same blade shape, and the same number of blades, due to the influence of mold processing, the skew-twist cross-flow fan blade needs a larger draft angle and a thicker blade thickness than the straight-blade cross-flow fan blade. Therefore, the cost of the skew-twist cross-flow fan blade is higher, and according to experimental measurement, the skew of the blade will slightly reduce the air volume at the same speed compared with the straight-blade cross-flow fan blade.

[0004] Based on the cost disadvantage of the skew-twist cross-flow fan blade and the disadvantage of the air volume reduction at the same speed, improvements are made to the structure of the skew-twist cross-flow fan blade to reduce the cost of the skew-twist cross-flow fan blade and increase the air volume of the skew-twist cross-flow fan blade at the same speed, which is a technical problem to be solved at present. SUMMARY

[0005] The problem solved by the present application is that the existing skew-twist cross-flow fan blade has a high cost and a small air volume at the same speed.

[0006] To solve the above problems, in a first aspect, the present application provides a skew-twist cross-flow fan blade, which comprises a blade, and a flow channel groove is formed at the suction surface of the blade.

[0007] The skew-twist cross-flow fan blade provided by the present embodiment has the following beneficial effects:

[0008] 1. The flow channel groove is formed at the outlet angle of the suction surface of the blade, which can reduce the proportion of the blade area to the entire circumferential flow channel, thereby increasing the air volume of the skew-twist cross-flow fan blade;

[0009] 2. The length of the flow channel groove extends to the edge of the outlet angle along the circumference of the blade, which can reduce the flow wake zone generated when the blade flows out and reduce noise;

[0010] 3. The flow channel groove is formed on the blade to form a hollow area, thereby reducing the material cost of the skew-twist cross-flow fan blade.

[0011] In an optional embodiment, the depth of the flow channel groove changes proportionally along the length direction.

[0012] In this way, the bottom surface of the flow channel groove is more suitable for the smooth airflow, and the noise is reduced, and the depth of most of the flow channel groove is small, which can further ensure the strength of the oblique and twisted cross-flow fan blade.

[0013] In an optional embodiment, the depth of the flow channel groove ranges from 0 to 0.3R1.

[0014] Wherein, a line L1 parallel to the middle camber line of the blade is drawn from the slotting starting point a1, a circle C1 is drawn with a point on the middle camber line as the center, the circle C1 is tangent to the line L1, and R1 is the radius of the circle C1.

[0015] In this way, the depth of the flow channel groove is moderate, and the strength of the oblique and twisted cross-flow fan blade is reduced less, which meets the requirements of the drop test and the fan blade strength test.

[0016] In an optional embodiment, the depth of the flow channel groove gradually increases from 0 to d1 from the slotting starting point a1 to the groove bottom starting point a2, wherein d1=0.01R1.

[0017] In an optional embodiment, the depth of the flow channel groove gradually increases from d1 to d2 from the groove bottom starting point a2 to the groove bottom end point a3, wherein d2=0.3R1.

[0018] In an optional embodiment, the depth of any groove bottom point a4 between the groove bottom starting point a2 and the groove bottom end point a3 of the flow channel groove is d3, wherein d3=R3-R2*R3 / R1.

[0019] A line L2 parallel to the middle camber line of the blade is drawn from the groove bottom starting point a2, a circle C2 is drawn with a point on the middle camber line as the center, the circle C2 is tangent to the line L2, and R2 is the radius of the circle C2.

[0020] A line L3 parallel to the middle camber line of the blade is drawn from the groove bottom point a4, a circle C3 is drawn with a point on the middle camber line as the center, the circle C3 is tangent to the line L3, and R3 is the radius of the circle C3.

[0021] In an optional embodiment, the length of the flow channel groove is less than 2 / 3 of the arc length of the blade.

[0022] In an optional embodiment, the included angle β between the length direction of the flow channel groove and the longitudinal axis of the blade ranges from (L2*θ / L1-10°) to (L2*θ / L1+10°).

[0023] The longitudinal axis is perpendicular to the fan blade axis of the blade, L1 is the length of the single-joint fan blade, L2 is the distance from the position of the flow channel groove to the end of the single-joint fan blade, and θ is the inclination angle of the blade relative to the fan blade axis.

[0024] Thus, the angle β between the length direction of the flow channel groove and the longitudinal axis of the blade is within a range and includes L2*θ / L1, which not only ensures the airflow flowing effect of the flow channel groove, but also facilitates processing.

[0025] In an optional embodiment, β=L2*θ / L1.

[0026] Thus, although the inclination angle θ of the blade at different positions relative to the blade shaft is different, the value of β is L2*θ / L1, which can make the tangent of the flow channel groove of the blade at different positions also have an inclination of θ angle, so that the airflow flowing effect of the flow channel groove is optimal.

[0027] In a second aspect, the application provides an air conditioner, which comprises the oblique twisted cross-flow blade according to any one of the preceding embodiments.

[0028] The air conditioner provided by the embodiment adopts the oblique twisted cross-flow blade, which can not only improve the air volume, but also reduce noise and material cost. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 FIG. 1 is a structural schematic view of a single-section blade of the oblique twisted cross-flow blade according to an embodiment of the application from one perspective;

[0030] Figure 2 FIG. 2 is a structural schematic view of a single-section blade of the oblique twisted cross-flow blade according to an embodiment of the application from another perspective;

[0031] Figure 3 FIG. 3 is a sectional view of the blade.

[0032] FIG. 4 is a structural schematic view of the oblique twisted cross-flow blade according to an embodiment of the application.

[0033] 1-oblique twisted cross-flow blade; 2-end plate; 3-blade; 31-suction surface; 32-flow channel groove. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the specific embodiments of the application will be described in detail below with reference to the drawings.

[0035] Please refer to Figure 1 and Figure 2 , the embodiment provides an oblique twisted cross-flow blade 1, Figure 1 and Figure 2 only one single-section blade of the oblique twisted cross-flow blade 1 is shown, and the oblique twisted cross-flow blade 1 can be formed by sequentially connecting a plurality of single-section blades. The oblique twisted cross-flow blade 1 comprises an end plate 2 and a blade 3, and a plurality of blades 3 are connected to the end face of the end plate 2. The blade 3 has an inclination angle relative to the end plate 2.

[0036] The flow channel groove 32 is formed by directly cutting material on the suction surface 31 of the blade 3. The length of the flow channel groove 32 extends to the edge of the outlet angle along the circumference of the blade 3. The outlet angle here refers to the included angle between the tangent of the outlet edge of the blade 3 and the circumferential direction. In this embodiment, the length of the flow channel groove 32 extends to the edge of the blade 3 along the circumference of the blade 3, and the length of the flow channel groove 32 does not extend to the root of the blade 3.

[0037] In this way, the flow channel groove 32 is formed at the outlet angle of the suction surface 31 of the blade 3, which can reduce the area ratio of the blade 3 on the entire circumferential flow channel, improve the air volume of the inclined and twisted cross-flow fan blade 1, reduce the flow wake area generated when the blade 3 flows out, reduce noise, and also reduce the material cost of the inclined and twisted cross-flow fan blade 1.

[0038] Regarding the initial position of the flow channel groove 32, the length of the flow channel groove 32 is less than 2 / 3 of the arc length of the blade 3, that is, the distance of the initial position of the flow channel groove 32 from the root edge of the blade 3 is greater than 1 / 3 of the arc length of the blade 3. In this way, the flow channel groove 32 does not reduce the original air flow effect of the blade 3, and the strength of the blade 3 is ensured.

[0039] Please refer to Figure 2 , regarding the relationship between the length direction of the flow channel groove 32 and the fan blade axis L f of the blade 3. The fan blade axis L f of the blade 3 is also called the fan blade rotation axis. The included angle β between the length direction of the flow channel groove 32 and the longitudinal axis L z of the blade 3 is in the range of (L2*θ / L1-10°)~(L2*θ / L1+10°); wherein the longitudinal axis L z is perpendicular to the fan blade axis L f of the blade 3, L1 is the length of the single-section fan blade, L2 is the distance from the position of the flow channel groove 32 to the end of the single-section fan blade; and θ is the inclination angle of the blade 3 relative to the fan blade axis L f . In this way, the included angle β between the length direction of the flow channel groove 32 and the longitudinal axis L z of the blade 3 is a range, and includes L2*θ / L1, which not only ensures the air flow effect of the flow channel groove 32, but also facilitates processing.

[0040] Preferably, β=L2*θ / L1. In this way, although the inclination angle θ of the blade 3 at different positions relative to the fan blade axis L f is different, the value of β is L2*θ / L1, which can make the tangent of the flow channel groove 32 of the blade 3 at different positions also have an inclination angle of θ, so that the air flow effect of the flow channel groove 32 is optimal.

[0041] Please refer to Figure 3 , the depth of the flow channel groove 32. The depth of the flow channel groove 32 varies proportionally along the length direction, and is not constant. The proportional variation trend can be linear deepening or curved variation, or a combination of linear and curved variation. In this way, the bottom surface of the flow channel groove 32 is more suitable for smooth airflow, reduces noise, and the depth of most of the flow channel groove 32 is small, which can further ensure the strength of the oblique twisted cross-flow fan blade 1.

[0042] Overall, the depth of the flow channel groove 32 can range from 0 to 0.3R1, and the depth of the groove starting point a1 of the flow channel groove 32 is 0. A line L1 parallel to the mean camber line L5 of the blade 3 is drawn through the groove starting point a1, a circle C1 is drawn with a point on the mean camber line L5 as the center, the circle C1 is tangent to the line L1, R1 is the radius of the circle C1, and there is a point on each blade 3 that is equidistant from the pressure surface and the suction surface 31. These points form the mean camber line L5. In this way, the depth of the flow channel groove 32 is moderate, which reduces the strength of the oblique twisted cross-flow fan blade 1 less, and meets the requirements of the drop test and the fan blade strength test.

[0043] Specifically, the depth of the flow channel groove 32 gradually increases from 0 to d1 from the groove starting point a1 to the groove bottom starting point a2, where d1 = 0.01R1. The depth of the flow channel groove 32 gradually increases from d1 to d2 from the groove bottom starting point a2 to the groove bottom end point a3, where d2 = 0.3R1. Above, the values of d1 and d2 are only recommended values, and other similar values can also be used.

[0044] The depth of any groove bottom point a4 between the groove bottom starting point a2 and the groove bottom end point a3 of the flow channel groove 32 is d3, where d3 = R3-R2*R3 / R1; a line L2 parallel to the mean camber line L5 of the blade 3 is drawn through the groove bottom starting point a2, a circle C2 is drawn with a point on the mean camber line L5 as the center, the circle C2 is tangent to the line L2, R2 is the radius of the circle C2; a line L3 parallel to the mean camber line L5 of the blade 3 is drawn through the groove bottom point a4, a circle C3 is drawn with a point on the mean camber line L5 as the center, the circle C3 is tangent to the line L3, R3 is the radius of the circle C3. It can also be known that d1 = R2-R1.

[0045] It is easy to understand that above, the value of d3 is only a recommended value, and other similar values can also be used, or other linear relationship formulas can be used to determine.

[0046] In this way, the depth of the flow channel groove 32 changes continuously with the mean camber line L5, that is, the thickness of the material cut by the mean camber line L5 on the blade 3 changes continuously, and the depth of the flow channel groove 32 changes linearly along the mean camber line L5. By determining the depth of the flow channel groove 32 at the groove bottom starting point a2, the depth of the entire flow channel groove 32 can be determined, which is convenient for manufacturing and production.

[0047] It is easy to understand that the flow channel groove 32 in the embodiment can also be applied to other types of cross-flow fan blades, such as straight blades 3 cross-flow fan blades, and can also play a role in improving the air volume. The use of the flow channel groove 32 in the embodiment on other types of fan blades should also belong to the scope claimed in the application.

[0048] The flow channel grooves 32 can be spaced apart on the same blade 3, and the spacing distance can be determined according to the length of the blade 3 and the strength requirement of the blade 3.

[0049] The flow channel grooves 32 on the same blade 3 can be the same in shape and size, or different. The flow channel grooves 32 at different positions on the same blade 3 can be different in length, width or depth.

[0050] The positions of the flow channel grooves 32 on different blades 3 can be the same or different, as long as the strength of the blade 3 can be ensured and the air volume of the blade 3 can be improved.

[0051] The embodiment also provides an air conditioner, which adopts the oblique twist cross-flow fan blade 1, and can not only improve the air volume, but also reduce the noise and the material cost.

[0052] The oblique twist cross-flow fan blade 1 and the air conditioner provided by the embodiment have the following beneficial effects:

[0053] 1. The flow channel groove 32 is arranged at the outlet angle of the suction surface 31 of the blade 3, which can reduce the proportion of the fan blade area of the blade 3 on the entire circumferential flow channel, and improve the air volume of the oblique twist cross-flow fan blade 1;

[0054] 2. The length of the flow channel groove 32 extends to the edge of the outlet angle along the circumference of the blade 3, which can reduce the flow wake zone generated when the blade 3 flows out, and reduce the noise;

[0055] 3. The flow channel groove 32 is arranged on the blade 3 to form a hollow area, which reduces the material cost of the oblique twist cross-flow fan blade 1;

[0056] 4. The depth of the flow channel groove 32 changes proportionally along the length direction, so that the bottom surface of the flow channel groove 32 is more suitable for smooth airflow, reduces the noise, and moreover, the depth of most of the area of the flow channel groove 32 is small, which can further ensure the strength of the oblique twist cross-flow fan blade 1;

[0057] 5. The depth of the flow channel groove 32 at the starting point a2 of the groove bottom can determine the depth of the entire flow channel groove 32, which is convenient for manufacturing and production;

[0058] 6. The angle β between the length direction of the flow channel groove 32 and the longitudinal axis of the blade 3 is within a range and contains L2*θ / L1, which not only can ensure the airflow effect of the flow channel groove 32, but also can facilitate processing.

[0059] 7. The length of the flow channel 32 is less than 2 / 3 of the arc length of the blade 3, so that the flow channel 32 does not reduce the original air flow effect of the blade 3, and ensures the strength of the blade 3.

[0060] Although the present application has been disclosed with reference to the above embodiments, the present application is not limited to the above. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and the scope of protection of the present application should be defined by the scope of claims.

Claims

1. A type of oblique-twist cross-flow fan blade, characterized in that, The oblique twist cross-flow fan blade includes a blade (3), and a flow channel groove (32) is provided at the suction surface (31) of the blade (3). The length of the flow channel groove (32) extends along the circumference of the blade (3) to the edge of the outlet corner. The angle β between the length direction of the flow channel (32) and the longitudinal axis of the blade (3) is in the range of (L2*θ / L1-10°) to (L2*θ / L1+10°). The longitudinal axis is perpendicular to the blade axis of the blade (3), L1 is the length of a single blade section, L2 is the distance from the location of the flow channel groove (32) to the end of the single blade section, and θ is the tilt angle of the blade (3) relative to the blade axis.

2. The oblique-torsion cross-flow fan blade according to claim 1, characterized in that, The depth of the flow channel (32) varies proportionally along its length.

3. The oblique-torsion cross-flow fan blade according to claim 1, characterized in that, The depth of the flow channel (32) ranges from 0 to 0.3R1; Among them, a line L1 parallel to the middle arc of the blade (3) is drawn from the grooving starting point a1, and a circle C1 is drawn with the point on the middle arc as the center. The circle C1 is tangent to the line L1, and R1 is the radius of the circle C1.

4. The oblique-torsion cross-flow fan blade according to claim 3, characterized in that, The depth of the channel groove (32) from the groove starting point a1 to the bottom starting point a2 gradually increases from 0 to d1, where d1=0.01R1.

5. The oblique torsion cross-flow fan blade according to claim 4, characterized in that, The depth of the flow channel (32) from the starting point a2 to the ending point a3 gradually increases from d1 to d2, where d2=0.3R1.

6. The oblique-torsion cross-flow fan blade according to claim 3, characterized in that, The depth of any bottom point a4 between the bottom starting point a2 and the bottom ending point a3 of the flow channel (32) is d3, where d3 = R3 - R2 * R3 / R1; Draw a line L2 parallel to the middle arc of the blade (3) from the starting point a2 at the bottom of the groove. Draw a circle C2 with the point on the middle arc as the center. The circle C2 is tangent to the line L2. R2 is the radius of the circle C2. Draw a line L3 parallel to the middle arc of the blade (3) through the bottom point a4 of the groove, and draw a circle C3 with the point on the middle arc as the center. The circle C3 is tangent to the line L3, and R3 is the radius of the circle C3.

7. The oblique-torsion cross-flow fan blade according to claim 1, characterized in that, The length of the flow channel groove (32) is less than 2 / 3 of the arc length of the blade (3).

8. The oblique-torsion cross-flow fan blade according to claim 1, characterized in that, β = L2*θ / L1.

9. An air conditioner, characterized in that, The air conditioner includes the oblique twist cross-flow fan blade as described in any one of claims 1 to 8.

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