Cross-flow impeller and air conditioner thereof

Abstract

The present invention discloses a cross-flow impeller, which comprises a plurality of middle-section impeller blades. The middle-section impeller blades include a disc and a plurality of blades. The plurality of blades are fixed on the disc. Drainage protrusions are arranged on the back surface of the blades. A recessed portion is provided between the end of the blade and the drainage protrusion. This cross-flow impeller can change the air inlet and outlet angles of the blades, reduce the air flow separation phenomenon near the trailing edge of the blade back surface, not only can effectively increase the air volume of the air conditioner indoor unit, but also reduce the noise of the air conditioner indoor unit.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and more particularly to a cross-flow fan blade and an air conditioner using the same. Background Art

[0002] A cross-flow fan is also called a transverse-flow fan. The impeller in a cross-flow fan is usually referred to as a cross-flow fan blade. The impeller is multi-bladed and long cylindrical, with forward multi-wing blades. When the impeller rotates, the air flow enters the blade row from the open part of the impeller, passes through the inside of the impeller, and is discharged into the volute from the other blade row, forming a working air flow. The flow condition of the air flow in the impeller is very complex. The air flow velocity field is unstable. There is also a vortex in the impeller, and the center is located near the volute tongue. The existence of the vortex causes a circulating flow at the output end of the impeller. Outside the vortex, the air flow streamline in the impeller is arc-shaped. Therefore, the flow velocities at various points on the outer circumference of the impeller are not consistent. The closer to the vortex center, the greater the velocity; the closer to the volute, the smaller the velocity. If the vortex center is far from the volute tongue, the area of the circulating flow increases, the fan efficiency decreases, and the instability of the flow rate increases.

[0003] In existing air conditioners, cross-flow fans are generally used. The components of the air conditioner include an evaporator, a panel, a volute, a volute tongue, and a cross-flow fan blade, etc. The cross-flow fan blade is arranged in the central part of the volute. The cross-flow fan blade is divided into an inlet area and an outlet area by the volute tongue and the volute. The evaporator often adopts a two-fold or three-fold structure design. The evaporator is arranged on the inlet side of the cross-flow fan blade. The air flow enters from the inlet, passes through the evaporator, and then reaches the cross-flow fan blade. The circumferential distance between the evaporator and the cross-flow fan blade is not equal. The air flow velocity directions vary greatly at various circumferential positions in the inlet area of the cross-flow fan blade. It is easy for the air flow to separate and fall off on the surface of the blade, forming a low-speed vortex area, thereby reducing the air volume of the air conditioner or increasing the intake noise on the surface of the fan blade.

[0004] The existing solution to the above problems is to improve the blades in the cross-flow fan. For example, the State Intellectual Property Office publicly disclosed a patent document with the publication number CN103133360B on October 28, 2015, a cross-flow fan and an air conditioner, including: a fixed member; and a plurality of blades fixed to the upper surface of the fixed member and circumferentially separated from each other, wherein one end of one or more of the blades has a protrusion that protrudes downward from the surface of the blade, wherein the protrusion protrudes from the outer edge of the blade, wherein the outer surface of the protrusion is connected to the outer edge surface of the blade in the form of a curved surface, and wherein the inner surface of the protrusion facing the inside of the cross-flow fan is in the form of a flat surface inclined at a predetermined angle with respect to the lower surface of the blade. The technical point of the above patent is that there is a protrusion at the end of the blade, the protrusion protrudes downward (the blade basin), the protrusion protrudes from the outer edge of the blade, the protrusion is connected to the outer edge surface of the blade, and the protrusion is in a curved shape that protrudes downward from the surface of the blade, which is different from the technical solution of the present invention patent. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to avoid the deficiencies in the prior art and provide a cross-flow fan blade that can change the air inlet and outlet angles of the blade, reduce the air flow separation phenomenon near the trailing edge of the blade back, not only can effectively improve the air volume of the air conditioner indoor unit, but also reduce the noise of the air conditioner indoor unit.

[0006] An embodiment of the present invention provides a cross-flow fan blade, including a plurality of middle-section fan blades. The middle-section fan blades include a disc and a plurality of blades. The plurality of blades are fixed on the disc. A drainage protrusion is provided on the blade back surface of the blade, and a recess is provided between the end of the blade and the drainage protrusion.

[0007] Further, the drainage protrusion is provided with an arc-shaped drainage edge. The drainage protrusion and the blade back surface of the blade are smoothly connected through the recess, and the recess is tangent to the arc-shaped drainage edge.

[0008] Further, the drainage protrusion is close to the outer edge position of the blade and is inclined in the direction of the outer edge of the blade. The center line of the drainage protrusion is arc-shaped, straight-shaped or spline-shaped.

[0009] Further, the radius R1 of the arc-shaped drainage edge is smaller than the radius R2 of the recess, and the radius R2 of the recess is greater than 0.5 mm.

[0010] Further, the chord length of the blade is L0;

[0011] The projection distance L1 on the chord line of the blade between the outer end starting point of the center line of the drainage protrusion and the outer edge vertex of the center line of the blade;

[0012] The projection length L2 on the chord line of the blade between the intersection point of the center line of the drainage protrusion and the center line of the blade and the outer edge vertex of the center line of the blade;

[0013] The projection distance L3 on the chord line of the blade between the center point of the maximum thickness d0 of the blade and the outer edge vertex of the center line of the blade;

[0014] The relationships satisfied by L0, L1, L2, and L3 are: L1 < L2 ≤ L3, L3 / L0 < 0.5.

[0015] Further, the perpendicular distance H0 from the center point of the maximum thickness d0 of the blade to the chord line of the blade;

[0016] The perpendicular distance H1 from the outer end starting point of the center line of the drainage protrusion to the chord line of the blade;

[0017] The perpendicular distance H2 from the intersection point of the center line of the drainage protrusion and the center line of the blade to the chord line of the blade;

[0018] The relationships satisfied by H0, H1, and H2 are: H1 < H0, H2 < H0.

[0019] Further, the included angle A1 between the center line of the drainage protrusion and the tangent line of the center line of the blade;

[0020] The included angle A0 between the tangent line at the center point of the maximum thickness d0 of the blade and the tangent line of the center line of the blade;

[0021] The relationship satisfied by A0 and A1 is: A1 > A0.

[0022] Further, the drainage protrusion extends in the blade length direction to form a strip-shaped structure, or the drainage protrusion extends intermittently in the blade length direction to form a plurality of the drainage protrusions distributed at intervals.

[0023] Further, the distance between adjacent drainage protrusions is d;

[0024] The length of the drainage protrusion is d1;

[0025] The length of the blade is h;

[0026] The relationships satisfied by d, d1, and h are: 0.5 ≤ d / d1 ≤ 3, 0 ≤ d1 / h ≤ 0.3.

[0027] Further, the distance d between adjacent drainage protrusions = 5 mm;

[0028] The length d1 of the drainage protrusion is 5 mm;

[0029] The length of the blade is h = 65 mm;

[0030] The relationship satisfied by d, d1, and h is: d / d1 = 1, d1 / h = 0.078.

[0031] Furthermore, the distance d between adjacent drainage protrusions is 0 mm;

[0032] The length d1 of the drainage protrusion = the length h of the blade;

[0033] The relationship satisfied by d, d1, and h is: d / d1 = 0, d1 / h = 1.

[0034] Furthermore, there are multiple middle-section airfoils, and the multiple middle-section airfoils are connected in series in sequence; a through-hole is provided in the central part of the disk to form an annular structure; one end of the blade is connected to the disk surface and is perpendicular to the disk surface, and the multiple blades are distributed at intervals along the circumferential direction of the disk.

[0035] An embodiment of the present invention further provides an air conditioner, including a panel, a volute, a volute tongue, an evaporator, and the above-mentioned cross-flow airfoil. The panel and the volute enclose an air duct, the cross-flow airfoil is located in the air duct, the area between the volute tongue and the volute is an air outlet area, the top area between the panel and the volute is an air inlet area, and the evaporator is located in the air inlet area.

[0036] The beneficial effect of the present invention is that: since drainage protrusions are provided on the back surface of the blade, when the cross-flow airfoil rotates, the blade disperses and diverts the airflows in the air inlet area and the air outlet area into the recessed part between the blade and the drainage protrusion, thereby effectively reducing the airflow attack angle when the blade intakes air and reducing the airflow separation phenomenon near the trailing edge of the back surface of the blade. It can not only effectively increase the air volume of the indoor unit of the air conditioner, but also reduce the noise of the indoor unit of the air conditioner. Description of the Drawings

[0037] The invention is further described with the aid of the drawings, but the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the following drawings without creative efforts.

[0038] Figure 1 It is a schematic structural diagram of a cross-flow airfoil of the present invention;

[0039] Figure 2 It is a schematic structural diagram of the airfoil in the cross-flow airfoil of the present invention;

[0040] Figure 3 Isometric view of the impeller in a cross-flow impeller of the present invention;

[0041] Figure 4 Enlarged view of the blade in a cross-flow impeller of the present invention;

[0042] Figure 5 Schematic diagram of the intermittent extension structure of the drainage protrusion on the blade in a cross-flow impeller of the present invention;

[0043] Figure 6 Schematic diagram of the continuous extension structure of the drainage protrusion on the blade in a cross-flow impeller of the present invention;

[0044] Figure 7 Schematic diagram of the projection parameters of the blade in a cross-flow impeller of the present invention;

[0045] Figure 8 Schematic diagram of the height parameters of the blade in a cross-flow impeller of the present invention;

[0046] Figure 9 Schematic diagram of the included angle parameters of the blade in a cross-flow impeller of the present invention;

[0047] Figure 10 Schematic diagram of the structure of an air conditioner of the present invention.

[0048] The figure includes: 1. Middle section impeller; 2. Disk; 3. Blade; 4. Through hole; 5. Outer edge; 6. Inner edge; 7. Blade back; 8. Drainage protrusion; 9. Depressed part; 10. Arc-shaped drainage edge; 11. Center line of the drainage protrusion; 12. Center line of the blade; 13. Outer end starting point; 14. Outer edge vertex; 15. Intersection point; 16. Center point of the maximum thickness of the blade; 17. Chord line; 18. Volute; 19. Volute tongue; 20. Evaporator; 21. Cross-flow impeller; 22. Air outlet area; 23. Air inlet area; 24. Panel. Detailed implementation manners

[0049] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0050] Embodiment 1

[0051] As Figure 1-3As shown in the figure, this embodiment provides a cross-flow impeller, which includes a plurality of middle-section impellers 1. The plurality of middle-section impellers 1 are connected in series in sequence. The middle-section impeller 1 includes a disk 2 and a plurality of blades 3. The plurality of blades 3 are fixed on the disk 2. A through hole 4 is provided at the center of the disk 2, forming an annular structure. One end of the blade 3 is connected to the disk surface of the disk 2 and is perpendicular to the disk surface of the disk 2. The plurality of blades 3 are spaced along the circumferential direction of the disk 2. A drainage protrusion 8 is provided on the back surface 7 of the blade 3. A recess 9 is provided between the end of the blade 3 and the drainage protrusion 8. Since the drainage protrusion 8 is provided on the back surface 7 of the blade 3, when the cross-flow impeller rotates, the blade 3 disperses and diverts the airflows in the intake area 23 and the outlet area 22 into the recess 9 between the blade 3 and the drainage protrusion 8, thereby effectively reducing the airflow attack angle when the blade 3 intakes air and reducing the airflow separation phenomenon near the trailing edge of the back surface 7. Compared with the traditional cross-flow impeller, the indoor unit can increase the air volume by 5% or reduce the noise by 1 - 1.5 dBA.

[0052] The specific installation method of a cross-flow wind in this embodiment is as follows:

[0053] First, one end of the blade 3 is welded to the disk surface of the disk 2 and is perpendicular to the disk surface of the disk 2. The plurality of blades 3 are spaced along the circumferential direction of the disk 2. The other end of the blade 3 is welded and fixed to the back surface of the disk 2 in the adjacent middle impeller 1.

[0054] As Figure 4 shown, in the preferred embodiment, among the blades 3, the edge of the blade 3 far from the center of the disk 2 is the outer edge 5, and the edge of the blade close to the center of the disk is the inner edge 6. The cross-section of the blade 3 is an arc-shaped structure. The concave surface of the blade 3 is the blade basin, and the convex surface of the blade 3 is the back surface 7. A drainage protrusion 8 is provided on the back surface 7 of the blade 3 and near the outer edge 5 of the blade; in the cross-section of the blade 3, the drainage protrusion 8 is provided with an arc-shaped drainage edge 10. The drainage protrusion 8 and the back surface 7 of the blade 3 are smoothly connected through the recess 9, and the recess 9 is tangent to the arc-shaped drainage edge 10; further, the drainage protrusion center line 11 of the drainage protrusion 8 is arc-shaped, straight-line-shaped or spline-shaped. Since the drainage protrusion 8 is provided, when the blade 3 rotates, it changes the frequency stagger of the airflow on the surface of the blade 3, reduces the rotational noise generated when the cross-flow impeller rotates, and thus reduces the noise of the indoor unit.

[0055] As Figure 4 shown, in the cross-section of the blade 3, in the preferred embodiment, the radius R1 of the arc-shaped drainage edge 10 is smaller than the radius R2 of the recess 9, and the radius R2 of the recess 9 is greater than 0.5 mm. The blade 3 with this size can effectively reduce the airflow attack angle when the impeller intakes air, reduce the flow separation loss and the low-speed vortex area, so that the air conditioner increases the air volume and reduces the noise.

[0056] AsFigure 4 As shown in the figure, in the preferred embodiment, on the cross-section of the blade 3, the drainage protrusion 8 is close to the outer edge 5 of the blade 3 and is inclined towards the outer edge 5 of the blade 3. The drainage protrusion 8 and the blade 3 form a "Y" - shaped structure or an "r" - shaped structure. One end of the blade relative to the outer edge 5 is provided with an inner edge 6. The blade 3 in this shape can effectively reduce the airflow attack angle when the air inlet of the wind blade occurs, reduce the flow separation loss and the low - speed vortex area, so that the air conditioner increases the air volume and reduces the noise.

[0057] As Figure 7 shown in the figure, in the preferred embodiment, the chord length 17 of the blade 3 is L0; the outer - end starting point 13 of the center line 11 of the drainage protrusion, and the projection distance L1 on the chord 17 of the blade 3 of the outer - edge vertex 14 of the blade center line 12; the intersection point 15 of the center line 11 of the drainage protrusion and the blade center line 12, and the projection length L2 on the chord 17 of the blade 3 of the outer - edge vertex 14 of the blade center line 12; the center point 16 of the maximum thickness d0 of the blade, and the projection distance L3 on the chord 17 of the blade 3 of the outer - edge vertex 14 of the blade center line 12; the relationships satisfied by L0, L1, L2, and L3 are: L1 < L2 ≤ L3, L3 / L0 < 0.5. The structural design of the drainage protrusion 8 in this design is on the inner - edge 6 side of the maximum thickness of the blade 6, accurately defining the relative position at the maximum thickness of the blade 3, further improving the performance of the cross - flow fan blade, increasing the air volume of the air conditioner and reducing the noise.

[0058] As Figure 8 shown in the figure, in the preferred embodiment, the perpendicular distance between the center point 16 of the maximum thickness d0 of the blade and the chord 17 of the blade 3 is H0; the perpendicular distance between the outer - end starting point 13 of the center line 11 of the drainage protrusion and the chord 17 of the blade 3 is H1; the perpendicular distance between the intersection point 15 of the center line 11 of the drainage protrusion and the blade center line 12 and the chord 17 of the blade 3 is H2; the relationships satisfied by H0, H1, and H2 are: H1 < H0, H2 < H0. The root height of the drainage protrusion 8 in this design does not exceed the height at the maximum thickness position of the blade, and the drainage structure is on the front side of the maximum thickness, improving the air - flow direction at the rear side and reducing separation.

[0059] As Figure 9 shown in the figure, in the preferred embodiment, the included angle between the center line 11 of the drainage protrusion and the tangent of the blade center line 12 is A1; the tangent of the center point 16 of the maximum thickness d0 of the blade and the tangent of the blade center line 12 is A0; the relationship satisfied by A0 and A1 is: A1 > A0. The drainage protrusion 8 in this design can effectively reduce the airflow attack angle when the air inlet of the wind blade occurs, reduce the flow separation loss and the low - speed vortex area, so that the air conditioner increases the air volume and reduces the noise.

[0060] As Figure 5-6As shown, in the preferred embodiment, the drainage protrusion 8 extends in the length direction of the blade 3 to form a strip-shaped structure, or the drainage protrusion 8 extends intermittently in the length direction of the blade 3 to form a plurality of drainage protrusions 8 distributed at intervals. Further, the distance between adjacent drainage protrusions 8 is d; the length of the drainage protrusion 8 is d1; the length of the blade 3 is h; the relationship satisfied by d, d1, and h is: 0.5 ≤ d / d1 ≤ 3, 0 ≤ d1 / h ≤ 0.3. There are at least two drainage protrusions 8 in the present invention, and at least one sawtooth shape is formed on the surface of the blade 3. The sawtooth distribution causes the peak staggering of the impact frequency of the air flow on the blade surface during the rotation of the cross-flow fan blade, reducing the rotational noise generated between the fan blade and the volute tongue 19 during the rotation of the cross-flow fan blade, thereby reducing the noise of the indoor unit.

[0061] As Figure 5 shown, in the preferred embodiment, the distance d between adjacent drainage protrusions 8 = 5 mm; the length d1 of the drainage protrusion 8 = 5 mm; the length of the blade 3 is h = 65 mm; the relationship satisfied by d, d1, and h is: d / d1 = 1, d1 / h = 0.078. In the length direction of the blade 3, there are 6 sawtooth grooves in the length direction of the blade 3. By comparing the circumferential relative speeds of the fan blade of the present invention and the existing fan blade through simulation calculation, the relative speed at the inlet and outlet of the blade 3 is reduced by about 0.5 m / s, effectively reducing the noise.

[0062] The advantage of this embodiment is that by comparing the circumferential relative speeds of the fan blade of the present invention and the existing fan blade through simulation calculation, the relative speed at the inlet and outlet of the blade 3 is reduced by about 0.5 m / s, greatly reducing the noise.

[0063] As Figure 10 shown, this embodiment further provides an air conditioner, including a panel 24, a volute 18, a volute tongue 19, an evaporator 20, and the cross-flow fan blade 21 of the present invention. The panel 24 and the volute 18 enclose an air duct. The cross-flow fan blade 21 of the present invention is located in the air duct. The area between the volute tongue 19 and the volute 18 is the air outlet area 22, and the top area between the panel 24 and the volute 18 is the air inlet area 23. The evaporator 20 is located in the air inlet area 23.

[0064] Embodiment 2

[0065] As Figure 6 shown, the difference between this embodiment and Embodiment 1 is that: the distance d between adjacent drainage protrusions 8 = 0 mm; the length d1 of the drainage protrusion 8 = the length h of the blade 3; the relationship satisfied by d, d1, and h is: d / d1 = 0, d1 / h = 1, which can improve the air flow and is beneficial to the improvement of the air volume.

[0066] The advantage of this embodiment is that it can improve the air flow and is beneficial to the improvement of the air volume.

[0067] Experimental Example

[0068] Experimental objects: The cross-flow impeller of any one of Embodiments 1-2 of the present invention and any impeller in the prior art.

[0069] Air volume (m³ / h) Noise dB(A) Power (W) Existing airfoil 480 44.8 28 Cross-flow airfoil of this patent 476 43.4 27.8

[0070] Table 1

[0071] As can be seen from Table 1 above, compared with the impeller in the prior art, the cross-flow impeller of the present invention can reduce the indoor unit noise by 1.4 dBA while keeping the air volume basically the same, and the power consumed is also less than that of the impeller in the prior art, even 0.2 W less. This verifies that the cross-flow impeller of the present invention can not only increase the air volume of the air conditioner, but also reduce the noise.

[0072] Advantages of the present invention: Since the drainage protrusions are provided on the back surface of the blade, when the cross-flow impeller rotates, the blade disperses and drains the air flow in the intake area and the outlet area into the recess between the blade and the drainage protrusion, thereby effectively reducing the air flow attack angle when the blade intakes air and reducing the air flow separation phenomenon near the trailing edge of the back surface of the blade. This can not only effectively increase the air volume of the air conditioner indoor unit, but also reduce the noise of the air conditioner indoor unit.

[0073] The above is the preferred embodiment of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. It should be pointed out that for those of ordinary skill in the art, any modification or equivalent replacement of the technical solution of the present invention does not depart from the protection scope of the technical solution of the present invention.

Claims

1. A cross-flow fan blade, comprising a plurality of middle-section fan blades, each middle-section fan blade including a disc and a plurality of blades, the plurality of blades being fixed to the disc, characterized in that: a drainage protrusion is provided on the back surface of the blade, and a recess is provided between the end of the blade and the drainage protrusion; the chord length of the blade is L0; the projection distance L1 on the chord of the blade between the outer end starting point of the center line of the drainage protrusion and the outer edge vertex of the center line of the blade; the projection length L2 on the chord of the blade between the intersection point of the center line of the drainage protrusion and the center line of the blade and the outer edge vertex of the center line of the blade; the projection distance L3 on the chord of the blade between the center point of the maximum thickness d0 of the blade and the outer edge vertex of the center line of the blade; the relationship satisfied by L0, L1, L2, and L3 is: L1 < L2 ≤ L3, L3 / L0 < 0.

5.

2. The cross-flow fan blade according to claim 1, characterized in that: the drainage protrusion is provided with an arc-shaped drainage edge, and the drainage protrusion and the back surface of the blade are smoothly connected through the recess, and the recess is tangent to the arc-shaped drainage edge.

3. The cross-flow fan blade according to claim 1, characterized in that: the drainage protrusion is close to the outer edge position of the blade and is inclined towards the outer edge direction of the blade, and the center line of the drainage protrusion is arc-shaped, straight-line-shaped or spline-shaped.

4. The cross-flow fan blade according to claim 2, characterized in that: the radius R1 of the arc-shaped drainage edge is less than the radius R2 of the recess, and the radius R2 of the recess is greater than 0.5 mm.

5. The cross-flow fan blade according to claim 1, characterized in that: the perpendicular distance from the center point of the maximum thickness d0 of the blade to the chord of the blade is H0; the perpendicular distance from the outer end starting point of the center line of the drainage protrusion to the chord of the blade is H1; the perpendicular distance from the intersection point of the center line of the drainage protrusion and the center line of the blade to the chord of the blade is H2; the relationship satisfied by H0, H1, and H2 is: H1 < H0, H2 < H0.

6. The cross-flow fan blade according to claim 1, characterized in that: the included angle between the center line of the drainage protrusion and the tangent of the center line of the blade is A1; the included angle between the tangent at the center point of the maximum thickness d0 of the blade and the tangent of the center line of the blade is A0; the relationship satisfied by A0 and A1 is: A1 > A0.

7. The cross-flow fan blade according to claim 1, characterized in that: the drainage protrusion extends in the blade length direction to form a strip-shaped structure, or the drainage protrusion extends intermittently in the blade length direction to form a plurality of the drainage protrusions distributed at intervals.

8. The cross-flow fan blade according to claim 1, characterized in that: the distance between adjacent drainage protrusions is d; the length of the drainage protrusion is d1; the length of the blade is h; the relationship satisfied by d, d1, and h is: 0.5 ≤ d / d1 ≤ 3, 0 ≤ d1 / h ≤ 0.

3.

9. The cross-flow fan blade according to claim 8, It is characterized in that: The distance d between adjacent drainage protrusions is 5 mm; The length d1 of the drainage protrusion is 5 mm; The length of the blade is h = 65 mm; The relationship satisfied by d, d1, and h is: d / d1 = 1, d1 / h = 0.

078.

10. A cross-flow fan blade according to claim 8, It is characterized in that: The distance d between adjacent drainage protrusions is 0 mm; The length d1 of the drainage protrusion is equal to the length h of the blade; The relationship satisfied by d, d1, and h is: d / d1 = 0, d1 / h = 1.

11. A cross-flow fan blade according to claim 1, It is characterized in that: There are multiple middle-section fan blades, and the multiple middle-section fan blades are connected in series in sequence. A through hole is provided in the central part of the disk to form an annular structure. One end of the blade is connected to the disk surface and is perpendicular to the disk surface. The multiple blades are distributed at intervals along the circumferential direction of the disk.

12. An air conditioner, It is characterized in that: It includes a panel, a volute, a volute tongue, an evaporator, and the cross-flow fan blade according to any one of claims 1-11. The panel and the volute enclose an air duct. The cross-flow fan blade is located in the air duct. The area between the volute tongue and the volute is the air outlet area. The top area between the panel and the volute is the air inlet area. The evaporator is located in the air inlet area.

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